3M Bair Hugger 775 User manual

Made in the USA by
3M HealthCare
2510 Conway Ave.
St. Paul, MN 55144
800-228-3957|www.bairhugger.com
3M, BAIR HUGGER and the
BAIRHUGGER logo are trademarks
of 3M. Used under license in Canada.
© 2016, 3M. All rights reserved.
Issue Date:2016-08
34-8718-8817-7
3M Deutschland GmbH
Health Care Business
Carl-Schurz-Str. 1
41453 Neuss
Germany
Model 775
Warming Unit
Service Manual
Normothermia System
13M™ Bair Hugger™
Warming Unit Model775
2Appareil de réchauffement
BairHugger™ 3M™, modèle 775
33M™ Bair Hugger™
Wärmeeinheit, Modell775
PDF Scaled at 75.0%

Model 775
Warming Unit
Service Manual
Normothermia System
1English......................................................1
2Français ................................................ 19
3Deutsch ............................................... 39
Description:
Base File Name:
Software:
SGS Contact:
Email:
Printer:
Printer Location:
Supplier:
3M
TM
Bair Hugger™
Patient Adjustable Warming Unit
Requester: Frank Boeshart/Debra Staack
Reference:
Die # / Doc. Size: 8.5" x 11"
Item Spec#:34-8718-8817-7
Supersedes#:
Cat/Product#:Model 775
Structure#:
Service Manual
PA: 34871888177.indb
GA:
InDesign CC 2014 - BOOK
PROCESS
BLACK
PMS
280
4394547 3
08.04.16 New Build kmh
08.26.16 Changes per RA proof report. TN
09.15.16 Final release. DJ
PDF Scaled at 75.0%

1
GB / 34-8718-8817-7
1Table of Contents
Introduction................................................................................................................................................................................... 3
Description of the 3M™ BairHugger™ Temperature ManagementSystem ........................................................... 3
Indications.............................................................................................................................................................................. 3
Denition ofSymbols .......................................................................................................................................................... 3
Explanation of Signal Word Consequences............................................................................................................................ 4
CONTRAINDICATION: ...................................................................................................................................................... 4
WARNING: ............................................................................................................................................................................ 4
CAUTION: ............................................................................................................................................................................. 4
NOTICE: ................................................................................................................................................................................ 4
Proper Use andMaintenance............................................................................................................................................. 5
Read Before ServicingEquipment .................................................................................................................................... 5
SafetyInspection ................................................................................................................................................................. 5
Warming UnitOverview...................................................................................................................................................... 5
Warming UnitPower-On-Reset......................................................................................................................................... 6
TemperatureModes ............................................................................................................................................................ 6
Airow Modes ...................................................................................................................................................................... 6
StandbyMode....................................................................................................................................................................... 6
FaultConditions.................................................................................................................................................................... 6
Over-Temperature Condition............................................................................................................................................. 6
Alternative Modes................................................................................................................................................................ 6
Accessing the Alternative Modes......................................................................................................................................7
Exiting an Alternative Mode................................................................................................................................................7
Required Preventative Maintenance.........................................................................................................................................7
Calibrating the Operating Temperature ...........................................................................................................................7
Testing the Over-Temperature DetectionSystem.........................................................................................................8
Viewing the Fault CodeLog............................................................................................................................................... 8
Clearing the Fault CodeLog .............................................................................................................................................. 8
Fault CodeTable................................................................................................................................................................... 9
Viewing the HourMeter ..................................................................................................................................................... 9
Viewing the OperatingTimer ............................................................................................................................................9
Replacing the AirFilter........................................................................................................................................................ 9
Replacing theHose .............................................................................................................................................................. 9
Detaching Warming Unit Hose .......................................................................................................................................... 9
Reattaching Warming Unit Hose......................................................................................................................................10
Replacing theFuses ............................................................................................................................................................10
Disassembling the Warming Unit .....................................................................................................................................10
Reassembling the WarmingUnit ......................................................................................................................................10
Cleaning, Maintenance and Storage ................................................................................................................................11
Troubleshooting............................................................................................................................................................................11
Technical Support and OrderPlacement ...............................................................................................................................12
Specications...............................................................................................................................................................................13
Maintenance Log.........................................................................................................................................................................17
PDF Scaled at 75.0%

3
GB / 34-8718-8817-7
13M™ BairHugger™ Warming Unit Model775
ServiceManual
Please forward to Biomedical EngineeringDepartment
Introduction
Description of the 3M™ BairHugger™ Temperature
ManagementSystem
The 3M™ BairHugger™ temperature management system consists of a
Model 775warming unit (with optional rolling stand, and other accessories)
along with a 3M warming blanket, Bair Hugger warming gown, or the 3M™
Ranger™ 241blood/fluid warmingset.
The Bair Hugger warming unit is attached to the warming blanket or
warming gown by means of a flexible hose. Warm air is generated in the
warming unit and flows through the warming unit hose and into the blanket
or gown. Depending on the model, the 3M blanket or gown is placed
either around, over, or underneath the patient. Small perforations on the
blanket or gown allow the warm air to be dispersed over the patient. For
blood/fluid warming applications, the Model 241blood/fluid warming
set is inserted in the warming unit hose. When the warming unit is turned
ON and a temperature setting is selected, warm air flows over the Model
241tubing and warmed blood/fluid exits from the distal end of the tubing.
For additional information on 3M blankets, gowns, the 241warming set, or
other accessories visit us online at bairhugger.com.
This manual includes operating and service instructions and warming unit
specifications for the Model 775warming unit. The warming unit can be
used in all clinical settings where the patient may feel too warm or too
cold. For information about using 3M blankets, gowns, or the 241 blood/
fluid warming set with the warming unit, refer to the respective Instructions
forUse.
Indications
The Bair Hugger temperature management system is intended to prevent
and treat hypothermia. In addition, the temperature management system
can be used to provide patient thermal comfort when conditions exist
that may cause patients to feel too warm or too cold. The temperature
management system can be used with adult and pediatricpatients.
• The Bair Hugger temperature management system should only be
used by trained medicalprofessionals.
• Federal law (USA) restricts this device to sale by or on the order of a
licensed healthcare professional.
Definition ofSymbols
The following symbols may appear on the product’s labeling or
exteriorpackaging.
An equipotentiality plug (grounded) conductor
other than a protective earth conductor or a neutral
conductor, providing a direct connection between
electrical equipment and the potential equalization
busbar of the electrical installation. Please consult IEC
60601-1 forrequirements.
Fuse
Type BF equipment (patient applied)
Date of manufacture
Manufacturer
Voltage, alternating current (AC)
This system is subject to European WEEE
Directive2002/96/EC. This product contains
electrical and electronic components and must not be
disposed of using standard refuse collection. Please
consult local directives for disposal of electrical and
electronicequipment.
Protective earth ground
No freehosing
High fansetting
Low fansetting
Non-explosionproof
Consult instructions foruse
Follow instructions foruse
Recycle to avoid environmental contamination. This
product contains recyclable parts. For information on
recycling, please contact your nearest 3M Service
Center for advice.
Attention; see instructions for use
Keepdry
Temperature limit
PDF Scaled at 75.0%

3
GB / 34-8718-8817-7
13M™ BairHugger™ Warming Unit Model775
ServiceManual
Please forward to Biomedical EngineeringDepartment
Introduction
Description of the 3M™ BairHugger™ Temperature
ManagementSystem
The 3M™ BairHugger™ temperature management system consists of a
Model 775warming unit (with optional rolling stand, and other accessories)
along with a 3M warming blanket, Bair Hugger warming gown, or the 3M™
Ranger™ 241blood/fluid warmingset.
The Bair Hugger warming unit is attached to the warming blanket or
warming gown by means of a flexible hose. Warm air is generated in the
warming unit and flows through the warming unit hose and into the blanket
or gown. Depending on the model, the 3M blanket or gown is placed
either around, over, or underneath the patient. Small perforations on the
blanket or gown allow the warm air to be dispersed over the patient. For
blood/fluid warming applications, the Model 241blood/fluid warming
set is inserted in the warming unit hose. When the warming unit is turned
ON and a temperature setting is selected, warm air flows over the Model
241tubing and warmed blood/fluid exits from the distal end of the tubing.
For additional information on 3M blankets, gowns, the 241warming set, or
other accessories visit us online at bairhugger.com.
This manual includes operating and service instructions and warming unit
specifications for the Model 775warming unit. The warming unit can be
used in all clinical settings where the patient may feel too warm or too
cold. For information about using 3M blankets, gowns, or the 241 blood/
fluid warming set with the warming unit, refer to the respective Instructions
forUse.
Indications
The Bair Hugger temperature management system is intended to prevent
and treat hypothermia. In addition, the temperature management system
can be used to provide patient thermal comfort when conditions exist
that may cause patients to feel too warm or too cold. The temperature
management system can be used with adult and pediatricpatients.
• The Bair Hugger temperature management system should only be
used by trained medicalprofessionals.
• Federal law (USA) restricts this device to sale by or on the order of a
licensed healthcare professional.
Definition ofSymbols
The following symbols may appear on the product’s labeling or
exteriorpackaging.
An equipotentiality plug (grounded) conductor
other than a protective earth conductor or a neutral
conductor, providing a direct connection between
electrical equipment and the potential equalization
busbar of the electrical installation. Please consult IEC
60601-1 forrequirements.
Fuse
Type BF equipment (patient applied)
Date of manufacture
Manufacturer
Voltage, alternating current (AC)
This system is subject to European WEEE
Directive2002/96/EC. This product contains
electrical and electronic components and must not be
disposed of using standard refuse collection. Please
consult local directives for disposal of electrical and
electronicequipment.
Protective earth ground
No freehosing
High fansetting
Low fansetting
Non-explosionproof
Consult instructions foruse
Follow instructions foruse
Recycle to avoid environmental contamination. This
product contains recyclable parts. For information on
recycling, please contact your nearest 3M Service
Center for advice.
Attention; see instructions for use
Keepdry
Temperature limit
PDF Scaled at 75.0%

43M™ Bair Hugger™ Warming Unit Model 775 – Service Manual
Explanation of Signal WordConsequences
!
WARNING:
Indicates a hazardous situation which, if not avoided, could result in
death or serious injury.
!
CAUTION:
Indicates a hazardous situation which, if not avoided, could result in
minor or moderate injury.
NOTICE:
Indicates a situation which, if not avoided, could result in property
damage only.
!
CONTRAINDICATION: To reduce the risk of thermalinjury:
• Do not apply heat to lower extremities during aortic
cross-clamping. Thermal injury may occur if heat is applied to
ischemiclimbs.
!
WARNING: To reduce the risk of thermalinjury:
• The Bair Hugger Model 775warming unit has been designed to
operate safely ONLY with 3M disposable warming products. Use
with other products may cause thermal injury. To the full extent
permitted by law, the manufacturer and/or importer declines all
responsibility for thermal injury resulting from the warming unit
being used in conjunction with non-3M products.
• Do not treat patients with the warming unit hose alone.
Always attach the hose to a 3M warming blanket/gown
before providing warmingtherapy.
• Do not allow the patient to lie on the warming unithose.
• Do not allow the warming unit hose to directly contact the
patient’s skin during warmingtherapy.
• Do not leave neonates, infants, children and other vulnerable
patient populations unattended during warmingtherapy.
• Do not leave patients with poor perfusion unmonitored during
prolonged warmingtherapy.
• Do not place the non-perforated side of the warming blanket/
gown on the patient. Always place the perforated side (with the
small holes) directly on top of the patient in contact with the
patient’sskin.
• Do not connect a torn or damaged blanket/gown to the
warmingunit.
• For over-body warming blankets and gowns; do not place
patient securement device (i.e. safety strap or tape) over the
warmingblanket/gown.
• For underbody or side channel warming blankets; if a securement
device (i.e. safety strap, tape) is used, en-sure the warming
channels are notoccluded.
• Do not place the warming blanket/gown directly over a dispersive
electrodepad.
• Do not continue warming therapy if the red Over-temp indicator
light illuminates and the alarm sounds. Unplug the warming unit
and contact a qualified servicetechnician.
• Do not continue 241blood/fluid warming therapy if the red
Over-temp indicator light illuminates and the alarm sounds.
Immediately stop fluid flow, and discard the blood/fluid
warming set. Unplug the warming unit, and contact a qualified
servicetechnician.
• For the BairHugger flex warming gown; ensure that the blood
pressure cuff, ECG, IV or other lines or cords are not between the
upper sleeve insert and the gown prior to deploying the upper
sleeve warming insert(s), as this could result in tearing of the
insert duringdeployment.
• Do not perform the over-temperature detection system test while
the warming unit is being used for warmingtherapy.
!
WARNING: To reduce the risk of patient injury or death due to
altered drugdelivery:
• Do not use a warming blanket/gown over transdermal
medication patches.
!
WARNING: To reduce the risk of injury due to interference
with ventilation:
• Do not allow the warming blanket/gown or head drape to
cover the patient’s head or airway when the patient is not
mechanicallyventilated.
!
WARNING: To reduce the risk of injury due to patientfalls:
• Do not use a warming blanket/gown to transfer or move
thepatient.
!
WARNING: To reduce the risks associated with hazardous voltage
andfire:
• Keep power cord visible and accessible at all times. The plug on
the power cord serves as the disconnectdevice.
• Only connect to outlets marked “Hospital only,” “Hospital Grade,”
or a reliable groundedoutlet.
• Use only the power cord specified for this product and certified
for the country ofuse.
• Do not allow the power cord to get wet.
• Do not use the warming unit when it appears the unit, power cord
or any component is damaged. Replace the warming unit. Contact
3M TechnicalSupport.
• Do not disassemble the warming unit unless you are a qualified
service technician. There are electrically live parts within the
warming unit when it is connected to a power source.
• Connect each warming unit being tested to a separate
powersource.
!
CAUTION: To reduce the risk of cross‑contamination:
• Except for specific Bair Hugger warming blanket models, 3M
blankets/gowns are not sterile. Each warming blanket/gown is
intended for single patient use ONLY. Placing a sheet between
the warming blanket/gown and the patient does not prevent
contamination of the product.
• Clean the warming unit and the outside of the warming unit hose
after each patient use. See “Cleaning Instructions” on page 11.
• Follow applicable regulations when disposing of this warming unit
or any of its electricalcomponents.
• Do not attempt to clean the air filter as it may be contaminated
from use. Discard the filter in a manner consistent with
institutional protocol.
• Do not operate the BairHugger warming unit with the hose
detached from the 3M warming blanket/gown. The Bair Hugger
warming unit is intended to be used with the hose properly
attached to its corresponding warming blanket/gown and
in accordance with good practices for operating room
steriletechnique.
!
CAUTION: To reduce the risk of patient or caregiverinjury:
• If mounted on an IV pole, the distance from the bottom of the
warming unit to the floor must be less than 44” (112 cm) and
the IV pole wheelbase diameter must be at least 28” (71cm) to
preventtipping.
5
GB / 34-8718-8817-7
!
CAUTION: To reduce the risk of fire:
• 3M warming blankets and gowns are classified as Class I Normal
Flammability as defined by the Consumer Product Safety
Commissions flammable fabric regulation, 16CFR 1610. Follow
standard safety protocols when using high intensity heat sources.
!
CAUTION: To reduce the risks of thermal injury, hyperthermia
or hypothermia:
• 3M recommends continuously monitoring core temperature. In
the absence of continuous monitoring, monitor the temperature
of patients who are incapable of reacting, communicating and/or
who cannot sense temperature a minimum of every 15minutes or
according to institutional protocol.
• Monitor cutaneous responses of patients who are incapable
of reacting, communicating and/or who cannot sense
temperature a minimum of every 15minutes or according to
institutional protocol.
• Adjust air temperature or discontinue warming therapy when
the therapeutic goal is reached, if elevated temperatures are
recorded or if there is an adverse cutaneous response in the
warmed area.
• Do not place the warming unit on a soft uneven surface, such
as a bed, or a visibly wet surface as the air in-take may become
blocked and cause the warming unit to overheat, compromising
the warming unit’sperformance.
• Perform all temperature testing of the warming unit with a 3M
Model 22110 temperature testunit.
!
CAUTION: To reduce the risk associated with electromagnetic
interference (EMI) due to portable and mobile radio frequency (RF)
communicationsequipment:
• The 3M BairHugger temperature management system has
been tested to be resistant to both EMI and electro-static
discharge(ESD).
• Install and put into service the 3M Bair Hugger temperature
management system according to the electromagnetic
compatibility (EMC) information provided in the Guidance and
Manufacturer’sDeclaration.
• Should interference occur, move away from the portable or
mobile RF communicationsequipment.
Notices
1. The Bair Hugger warming unit meets medical electronic interference
requirements. If radio frequency interference with other equipment
should occur, connect the warming unit to a different power source.
2. To avoid warming unitdamage:
• Use proper Electrostatic Discharge (ESD) procedures when
performing maintenance.
• Do not modify this equipment without authorization from
the manufacturer.
• Do not immerse the warming unit, warming unit parts
or accessories in any liquid or subject them to any
sterilizationprocess.
• Do not use cleaning solutions with greater than 80% alcohol or
solvents, including acetone and thinner, to clean the warming unit
or hose. Solvents may damage the labels and other plasticparts.
Proper Use andMaintenance
3M assumes no responsibility for the reliability, performance, or safety of
the warming unit if the following eventsoccur:
• Modifications or repairs are performed by unqualified personnel.
• The warming unit is used in a manner other than that described in
the Operator’s or ServiceManuals.
• The warming unit is installed in an environment that does not
meet the appropriate electrical and groundingrequirements.
• The warming unit not maintained in accordance with the
procedures described in the ServiceManual.
Read Before ServicingEquipment
All repair, calibration, and servicing of the warming unit require the skill
of a qualified, medical equipment service technician who is familiar
with good practice for medical device repair. If service does not require
the manufacturer’s attention, the Model 775 Service Manual provides
the technical information needed to service the warming unit. Perform
all repairs and maintenance in accordance with the instructions in the
Service Manual. For additional service information, please contact 3M
technicalsupport.
SafetyInspection
Perform a safety inspection after making repairs to the warming unit and
before returning the warming unit to service. A safety inspection should
include calibrating the operating temperature settings and testing the
over-temperature detection function as described in this service manual as
well as testing for leakage current and continuity check on safetyground.
Warming Unit Overview
When you connect the warming unit to a grounded power source, the
warming unit automatically performs the power-on-reset operation
described below. Following the power-on-reset operation, the warming unit
will enter the Standby mode. You can select any operating mode by pressing
the appropriate button on the warming unit control panel. See Figure 1.
TEMP IN RANGE
FAULT
OVER TEMP
STANDBY
AMBIENT
MODEL 775 43 C
MEDIUM
HIGH
TEMPERATURE
AIR FLOW
38 C
LOW
32 C
System
High Fan
Setting
Alphanumeric Display
Temperature
Modes
Low Fan
Setting
Figure 1. MODEL 775 WARMING UNIT Control panel
PDF Scaled at 75.0%

43M™ Bair Hugger™ Warming Unit Model 775 – Service Manual
Explanation of Signal WordConsequences
!
WARNING:
Indicates a hazardous situation which, if not avoided, could result in
death or serious injury.
!
CAUTION:
Indicates a hazardous situation which, if not avoided, could result in
minor or moderate injury.
NOTICE:
Indicates a situation which, if not avoided, could result in property
damage only.
!
CONTRAINDICATION: To reduce the risk of thermalinjury:
• Do not apply heat to lower extremities during aortic
cross-clamping. Thermal injury may occur if heat is applied to
ischemiclimbs.
!
WARNING: To reduce the risk of thermalinjury:
• The Bair Hugger Model 775warming unit has been designed to
operate safely ONLY with 3M disposable warming products. Use
with other products may cause thermal injury. To the full extent
permitted by law, the manufacturer and/or importer declines all
responsibility for thermal injury resulting from the warming unit
being used in conjunction with non-3M products.
• Do not treat patients with the warming unit hose alone.
Always attach the hose to a 3M warming blanket/gown
before providing warmingtherapy.
• Do not allow the patient to lie on the warming unithose.
• Do not allow the warming unit hose to directly contact the
patient’s skin during warmingtherapy.
• Do not leave neonates, infants, children and other vulnerable
patient populations unattended during warmingtherapy.
• Do not leave patients with poor perfusion unmonitored during
prolonged warmingtherapy.
• Do not place the non-perforated side of the warming blanket/
gown on the patient. Always place the perforated side (with the
small holes) directly on top of the patient in contact with the
patient’sskin.
• Do not connect a torn or damaged blanket/gown to the
warmingunit.
• For over-body warming blankets and gowns; do not place
patient securement device (i.e. safety strap or tape) over the
warmingblanket/gown.
• For underbody or side channel warming blankets; if a securement
device (i.e. safety strap, tape) is used, en-sure the warming
channels are notoccluded.
• Do not place the warming blanket/gown directly over a dispersive
electrodepad.
• Do not continue warming therapy if the red Over-temp indicator
light illuminates and the alarm sounds. Unplug the warming unit
and contact a qualified servicetechnician.
• Do not continue 241blood/fluid warming therapy if the red
Over-temp indicator light illuminates and the alarm sounds.
Immediately stop fluid flow, and discard the blood/fluid
warming set. Unplug the warming unit, and contact a qualified
servicetechnician.
• For the BairHugger flex warming gown; ensure that the blood
pressure cuff, ECG, IV or other lines or cords are not between the
upper sleeve insert and the gown prior to deploying the upper
sleeve warming insert(s), as this could result in tearing of the
insert duringdeployment.
• Do not perform the over-temperature detection system test while
the warming unit is being used for warmingtherapy.
!
WARNING: To reduce the risk of patient injury or death due to
altered drugdelivery:
• Do not use a warming blanket/gown over transdermal
medication patches.
!
WARNING: To reduce the risk of injury due to interference
with ventilation:
• Do not allow the warming blanket/gown or head drape to
cover the patient’s head or airway when the patient is not
mechanicallyventilated.
!
WARNING: To reduce the risk of injury due to patientfalls:
• Do not use a warming blanket/gown to transfer or move
thepatient.
!
WARNING: To reduce the risks associated with hazardous voltage
andfire:
• Keep power cord visible and accessible at all times. The plug on
the power cord serves as the disconnectdevice.
• Only connect to outlets marked “Hospital only,” “Hospital Grade,”
or a reliable groundedoutlet.
• Use only the power cord specified for this product and certified
for the country ofuse.
• Do not allow the power cord to get wet.
• Do not use the warming unit when it appears the unit, power cord
or any component is damaged. Replace the warming unit. Contact
3M TechnicalSupport.
• Do not disassemble the warming unit unless you are a qualified
service technician. There are electrically live parts within the
warming unit when it is connected to a power source.
• Connect each warming unit being tested to a separate
powersource.
!
CAUTION: To reduce the risk of cross‑contamination:
• Except for specific Bair Hugger warming blanket models, 3M
blankets/gowns are not sterile. Each warming blanket/gown is
intended for single patient use ONLY. Placing a sheet between
the warming blanket/gown and the patient does not prevent
contamination of the product.
• Clean the warming unit and the outside of the warming unit hose
after each patient use. See “Cleaning Instructions” on page 11.
• Follow applicable regulations when disposing of this warming unit
or any of its electricalcomponents.
• Do not attempt to clean the air filter as it may be contaminated
from use. Discard the filter in a manner consistent with
institutional protocol.
• Do not operate the BairHugger warming unit with the hose
detached from the 3M warming blanket/gown. The Bair Hugger
warming unit is intended to be used with the hose properly
attached to its corresponding warming blanket/gown and
in accordance with good practices for operating room
steriletechnique.
!
CAUTION: To reduce the risk of patient or caregiverinjury:
• If mounted on an IV pole, the distance from the bottom of the
warming unit to the floor must be less than 44” (112 cm) and
the IV pole wheelbase diameter must be at least 28” (71cm) to
preventtipping.
5
GB / 34-8718-8817-7
!
CAUTION: To reduce the risk of fire:
• 3M warming blankets and gowns are classified as Class I Normal
Flammability as defined by the Consumer Product Safety
Commissions flammable fabric regulation, 16CFR 1610. Follow
standard safety protocols when using high intensity heat sources.
!
CAUTION: To reduce the risks of thermal injury, hyperthermia
or hypothermia:
• 3M recommends continuously monitoring core temperature. In
the absence of continuous monitoring, monitor the temperature
of patients who are incapable of reacting, communicating and/or
who cannot sense temperature a minimum of every 15minutes or
according to institutional protocol.
• Monitor cutaneous responses of patients who are incapable
of reacting, communicating and/or who cannot sense
temperature a minimum of every 15minutes or according to
institutional protocol.
• Adjust air temperature or discontinue warming therapy when
the therapeutic goal is reached, if elevated temperatures are
recorded or if there is an adverse cutaneous response in the
warmed area.
• Do not place the warming unit on a soft uneven surface, such
as a bed, or a visibly wet surface as the air in-take may become
blocked and cause the warming unit to overheat, compromising
the warming unit’sperformance.
• Perform all temperature testing of the warming unit with a 3M
Model 22110 temperature testunit.
!
CAUTION: To reduce the risk associated with electromagnetic
interference (EMI) due to portable and mobile radio frequency (RF)
communicationsequipment:
• The 3M BairHugger temperature management system has
been tested to be resistant to both EMI and electro-static
discharge(ESD).
• Install and put into service the 3M Bair Hugger temperature
management system according to the electromagnetic
compatibility (EMC) information provided in the Guidance and
Manufacturer’sDeclaration.
• Should interference occur, move away from the portable or
mobile RF communicationsequipment.
Notices
1. The Bair Hugger warming unit meets medical electronic interference
requirements. If radio frequency interference with other equipment
should occur, connect the warming unit to a different power source.
2. To avoid warming unitdamage:
• Use proper Electrostatic Discharge (ESD) procedures when
performing maintenance.
• Do not modify this equipment without authorization from
the manufacturer.
• Do not immerse the warming unit, warming unit parts
or accessories in any liquid or subject them to any
sterilizationprocess.
• Do not use cleaning solutions with greater than 80% alcohol or
solvents, including acetone and thinner, to clean the warming unit
or hose. Solvents may damage the labels and other plasticparts.
Proper Use andMaintenance
3M assumes no responsibility for the reliability, performance, or safety of
the warming unit if the following eventsoccur:
• Modifications or repairs are performed by unqualified personnel.
• The warming unit is used in a manner other than that described in
the Operator’s or ServiceManuals.
• The warming unit is installed in an environment that does not
meet the appropriate electrical and groundingrequirements.
• The warming unit not maintained in accordance with the
procedures described in the ServiceManual.
Read Before ServicingEquipment
All repair, calibration, and servicing of the warming unit require the skill
of a qualified, medical equipment service technician who is familiar
with good practice for medical device repair. If service does not require
the manufacturer’s attention, the Model 775 Service Manual provides
the technical information needed to service the warming unit. Perform
all repairs and maintenance in accordance with the instructions in the
Service Manual. For additional service information, please contact 3M
technicalsupport.
SafetyInspection
Perform a safety inspection after making repairs to the warming unit and
before returning the warming unit to service. A safety inspection should
include calibrating the operating temperature settings and testing the
over-temperature detection function as described in this service manual as
well as testing for leakage current and continuity check on safetyground.
Warming Unit Overview
When you connect the warming unit to a grounded power source, the
warming unit automatically performs the power-on-reset operation
described below. Following the power-on-reset operation, the warming unit
will enter the Standby mode. You can select any operating mode by pressing
the appropriate button on the warming unit control panel. See Figure 1.
TEMP IN RANGE
FAULT
OVER TEMP
STANDBY
AMBIENT
MODEL 775 43 C
MEDIUM
HIGH
TEMPERATURE
AIR FLOW
38 C
LOW
32 C
System
High Fan
Setting
Alphanumeric Display
Temperature
Modes
Low Fan
Setting
Figure 1. MODEL 775 WARMING UNIT Control panel
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63M™ Bair Hugger™ Warming Unit Model 775 – Service Manual
Warming Unit Power‑On‑Reset
The warming unit automatically performs the following power-on-reset
sequence after you connect the warming unit to a properly grounded power
source (See Figure1):
• Performs all self-test functions.
• Illuminates indicator lights and all pixels in the alphanumeric
displaymomentarily.
• Displays the text “MD 700’s” and the software revision level in the
alphanumericdisplay.
• Sounds the alarm (three low-levelclicks).
• Enters the Standby mode with the high fan setting selected bydefault.
NOTE: The low fan setting indicator light will not illuminate during
powerup.
If the warming unit loses power for less than 1second, the warming unit
software will return the warming unit to the operating mode you selected
prior to the power loss. However, if the warming unit loses power for longer
than 1second, the warming unit software will reset when you restore power.
The warming unit will then enter the Standby mode with the high fan setting
selected bydefault.
Temperature Modes
The warming unit has 4operating modes: Ambient, 32°C, 38°C,43°C.
To select the 32°C, 38°C, 43°C, or Ambient mode, press the corresponding
button. The warming unit will operate within the specified temperature
range, shown in the tablebelow.
TEMPERATURE MODE TEMPERATURE OF DELIVEREDAIR
32°C 32°C ±1.5°C
38°C 38°C ±1.5°C
43°C 43°C ±1.5°C
Ambient Warming unit will supply air at
roomtemperature
After you select a temperature mode, the following eventsoccur:
• Corresponding temperature indicator lightilluminates.
• Blower operates at selected fanspeed.
• Heater activates except in Ambientmode.
• Temperature mode timer and hour meteractivate.
• Temperature at the blanket-end of the hose appears in the
alphanumericdisplay.
•Temp in Range indicator light illuminates when the temperature at the
blanket end of the hose is within ±1.5°C of the selected setting; this
indicator light does not illuminate in the Ambientmode.
AirflowModes
The warming unit has two preset fan speed settings: a default or high fan
setting ( ) and a reduced or low fan setting ( ). The warming unit will
reset/default to the high fan setting each time the warming unit is powered
up or Standby is selected. The low fan setting ( ) may be preselected while
in Standby prior to selecting the desiredtemperature.
StandbyMode
To place the warming unit in Standby mode, press the Standby button.
When in Standby mode, the following eventsoccur:
•Standby indicator light illuminates.
• Blower and heater are turnedOFF.
• Alphanumeric display deactivates.
• Alarm and fault detection functions remainactive.
• Operating timerpauses.
• Airflow mode resets/defaults to the high fansetting.
FaultConditions
The warming unit software recognizes several nonhazardous fault
conditionsincluding:
• Sensor failures
• Heaterfailures
• Computerfailure
• Software failure
• Keypadfailure
• Power supplyfailure
• Blower motor failure
• Forced over-temperature testfailure
When a fault condition exists, the following eventsoccur:
• Fault indicator light flashes.
• Audible alarmsounds.
• Blower and heater turnoff.
• Fault code appears in the alphanumericdisplay.
• Up to 5fault codes are stored inmemory.
When the audible alarm sounds, press any button on the keypad to silence
it. The warming unit must be unplugged before it can be restarted. See
“Viewing the Fault Code Log” on page 8and the “Fault Code Table” on
page 9for more information about specific faultcodes.
Over‑TemperatureCondition
When an over temperature condition exists, the following eventsoccur:
•Over‑temp indicator light flashes.
• Audible alarmsounds.
• Blower, heater, and operating mode indicator lights automatically
turnoff.
• Fault code appears in the alphanumeric display (see page9).
When the audible alarm sounds, press any button on the keypad to silence
it. The warming unit must be unplugged before it can berestarted.
AlternativeModes
The warming unit has 5 alternative modes that allow access to the service
and calibration utilities of the warming unit (see Figure 2on page 7).
ALTERNATIVE MODES DESCRIPTION
AltMode0 Hour Meter
AltMode1 Calibration
AltMode2 Fault CodeLog
AltMode3 System Information
AltMode4 Over-temperature DetectionTest
The Hour Meter mode displays the cumulative amount of operating time (in
Ambient, 32°C, 38°C, and 43°C modes) the warming unit has been in use.
The time is displayed in whole hoursonly.
The Calibration mode allows a technician to check and adjust the hose
end sensor calibration offset value. This should be done as part of routine
maintenance and after servicing the warming unit or replacing the hose.
The hose end sensor temperature can be altered a maximum of ±3.0°C by
adjusting the calibration offset value. In the Calibration mode, the warming
unit operates in the Ambient temperature mode, and the alphanumeric
display shows the current hose end sensor temperature and calibration
offset with 0.1°C precision.
The Fault Code Log mode sequentially displays the last 5fault codes stored
in system memory. Please refer to the “Fault Code Table” on page 8 for
more information about a particular fault code.
7
GB / 34-8718-8817-7
The System Information mode allows the technician to view important
system information including the firmware, system identification, serial port
baud rate, 5V power supply status, and the control board serialnumber.
The Over‑temperature Detection Test mode allows the user to test the
operation of the independent over-temperature shutdown system.
Accessing the AlternativeModes
To access the alternative modes, you must press the Alternative Mode
button that is located on the front panel of the warming unit but is
unlabeled. Press the center of the BairHugger logo when the instructions
direct you to press the Alternative Modebutton.
TEMP IN RANGE
FAULT
OVER TEMP
STANDBY
AMBIENT
MODEL 775 43 C
MEDIUM
HIGH
TEMPERATURE
AIR FLOW
38 C
LOW
32 C
System
System
Information
AltMode3
Alternative
Mode button
AltMode0
Over‑temperature
Detection
TestAltMode4
Fault
Code Log
AltMode2
Calibration
AltMode1
Figure 2. Location of Alternative Modebutton
To enter one of the alternative modes, press the Alternative Mode button in
combination with one of the operating mode buttons, also located on the
front panel. Figure 2 indicates which keys must be pressed to enter each of
the 5 alternative modes. When the correct combination of keys is pressed,
the display reads “Hold for AltModeX,” where “X” represents the selected
alternativemode.
Exiting an AlternativeMode
Exit the alternative modes by pressing the Alternative Mode button or by
waiting for 60seconds. You will need to access the alternative modes for
several of the service procedures described in thismanual.
Required PreventativeMaintenance
Note: Auto tester must not interrupt the voltage during warming unit on
power reset or an Error 053/054mayresult.
Calibrating the OperatingTemperature
!
Caution: Perform all temperature testing of the warming unit with a
3M Model 22110temperature testunit.
3M assumes no responsibility for the reliability, safety, or performance
of the BairHugger temperature management system if temperature
tests or adjustments are made in any manner other than those described
here. Improper measurement or adjustment of the warming unit’s normal
operating temperature could result in patient exposure to temperatures
outside of the indicated range and may lead to patient injury.
Service frequency
Every 6 months or 500hours of use, or whenever service isperformed.
Tools/equipment
Model 22110 temperature testunit
Calibrated thermocouple temperature monitor
NOTES:
• The Model 22110temperature test unit simulates the operating
characteristics of 3M warming blankets and gowns when used with
BairHugger warming units.
• When using the Model 22110 temperature test unit, take temperature
readings using a calibrated thermometer that can accept a male,
subminiature connector and read a “K” style thermocouple (e.g., a
Fluke Model 52K/J Thermometer). If the test unit connector does not
fit your thermometer, remove the connector from the test unit and
attach a connector that fits your meter. Be certain to observepolarity.
METHOD
Note: If the warming unit has been stored at a temperature lower than
20°C, allow it to reach ambient temperature before beginning the
calibration procedure.
1. Attach the Model 22110 temperature test unit to the end of the
warming unithose.
2. Connect the warming unit to a grounded power source. The
warming unit performs a self-test and automatically proceeds to
Standbymode.
3. Press the Ambient button to place the warming unit in Ambient
mode. Allow the warming unit to run in Ambient mode for at least
ten minutes to equalize the temperature of the warming unit’s
internalcomponents.
NOTE: Verify warming unit is set to high fan setting by ensuring the
indicator light next to the upper fan is illuminated.
4. Press the Alternative Mode button (see Figure 2. Location of
Alternative Mode button on page 7) and the Ambient button
simultaneously for 3 seconds. The warming unit is now in Calibration
mode. In this mode, the warming unit performs the following tasks:
•32°C and 38°C indicator lights flash indicating they can be used
to adjust the offset value.
• Blower remainson.
• Heater elements remainoff.
•ThetextTMP and the end of hose temperature in °C (0.1°C
resolution) appear in the alphanumeric display.
•ThetextOS and the current calibration offset value (0.1°C
resolution) appear in the alphanumeric display.
5. Compare the temperature shown on the alphanumeric display and the
temperature shown on the thermocouple monitor.
• If the temperatures match, no adjustment is necessary, press
the Alternative Mode button to return the warming unit to
Standby mode.
• If the temperatures do not match, adjust the warming unit
displayed temperature:
a. Press the 32°C button to decrease the temperature or the
38°C button to increase the temperature by 0.1°C. You can
adjust the temperature of the warming unit a maximum
of±3°C.
b. Continue to press the 32°C or 38°C button(s) until the
temperature in the alphanumeric display matches the
temperature on the thermocouple monitor as close
aspossible.
c. Press the Alternative Mode button to store the calibration
offset value and return the warming unit to Standbymode.
Note: If it is necessary to enter an offset value greater than ±3°C, there may
be a defect in the warming unit hose end sensor. Remove warming unit from
service until a new hose assembly can besubstituted.
PDF Scaled at 75.0%

63M™ Bair Hugger™ Warming Unit Model 775 – Service Manual
Warming Unit Power‑On‑Reset
The warming unit automatically performs the following power-on-reset
sequence after you connect the warming unit to a properly grounded power
source (See Figure1):
• Performs all self-test functions.
• Illuminates indicator lights and all pixels in the alphanumeric
displaymomentarily.
• Displays the text “MD 700’s” and the software revision level in the
alphanumericdisplay.
• Sounds the alarm (three low-levelclicks).
• Enters the Standby mode with the high fan setting selected bydefault.
NOTE: The low fan setting indicator light will not illuminate during
powerup.
If the warming unit loses power for less than 1second, the warming unit
software will return the warming unit to the operating mode you selected
prior to the power loss. However, if the warming unit loses power for longer
than 1second, the warming unit software will reset when you restore power.
The warming unit will then enter the Standby mode with the high fan setting
selected bydefault.
Temperature Modes
The warming unit has 4operating modes: Ambient, 32°C, 38°C,43°C.
To select the 32°C, 38°C, 43°C, or Ambient mode, press the corresponding
button. The warming unit will operate within the specified temperature
range, shown in the tablebelow.
TEMPERATURE MODE TEMPERATURE OF DELIVEREDAIR
32°C 32°C ±1.5°C
38°C 38°C ±1.5°C
43°C 43°C ±1.5°C
Ambient Warming unit will supply air at
roomtemperature
After you select a temperature mode, the following eventsoccur:
• Corresponding temperature indicator lightilluminates.
• Blower operates at selected fanspeed.
• Heater activates except in Ambientmode.
• Temperature mode timer and hour meteractivate.
• Temperature at the blanket-end of the hose appears in the
alphanumericdisplay.
•Temp in Range indicator light illuminates when the temperature at the
blanket end of the hose is within ±1.5°C of the selected setting; this
indicator light does not illuminate in the Ambientmode.
AirflowModes
The warming unit has two preset fan speed settings: a default or high fan
setting ( ) and a reduced or low fan setting ( ). The warming unit will
reset/default to the high fan setting each time the warming unit is powered
up or Standby is selected. The low fan setting ( ) may be preselected while
in Standby prior to selecting the desiredtemperature.
StandbyMode
To place the warming unit in Standby mode, press the Standby button.
When in Standby mode, the following eventsoccur:
•Standby indicator light illuminates.
• Blower and heater are turnedOFF.
• Alphanumeric display deactivates.
• Alarm and fault detection functions remainactive.
• Operating timerpauses.
• Airflow mode resets/defaults to the high fansetting.
FaultConditions
The warming unit software recognizes several nonhazardous fault
conditionsincluding:
• Sensor failures
• Heaterfailures
• Computerfailure
• Software failure
• Keypadfailure
• Power supplyfailure
• Blower motor failure
• Forced over-temperature testfailure
When a fault condition exists, the following eventsoccur:
• Fault indicator light flashes.
• Audible alarmsounds.
• Blower and heater turnoff.
• Fault code appears in the alphanumericdisplay.
• Up to 5fault codes are stored inmemory.
When the audible alarm sounds, press any button on the keypad to silence
it. The warming unit must be unplugged before it can be restarted. See
“Viewing the Fault Code Log” on page 8and the “Fault Code Table” on
page 9for more information about specific faultcodes.
Over‑TemperatureCondition
When an over temperature condition exists, the following eventsoccur:
•Over‑temp indicator light flashes.
• Audible alarmsounds.
• Blower, heater, and operating mode indicator lights automatically
turnoff.
• Fault code appears in the alphanumeric display (see page9).
When the audible alarm sounds, press any button on the keypad to silence
it. The warming unit must be unplugged before it can berestarted.
AlternativeModes
The warming unit has 5 alternative modes that allow access to the service
and calibration utilities of the warming unit (see Figure 2on page 7).
ALTERNATIVE MODES DESCRIPTION
AltMode0 Hour Meter
AltMode1 Calibration
AltMode2 Fault CodeLog
AltMode3 System Information
AltMode4 Over-temperature DetectionTest
The Hour Meter mode displays the cumulative amount of operating time (in
Ambient, 32°C, 38°C, and 43°C modes) the warming unit has been in use.
The time is displayed in whole hoursonly.
The Calibration mode allows a technician to check and adjust the hose
end sensor calibration offset value. This should be done as part of routine
maintenance and after servicing the warming unit or replacing the hose.
The hose end sensor temperature can be altered a maximum of ±3.0°C by
adjusting the calibration offset value. In the Calibration mode, the warming
unit operates in the Ambient temperature mode, and the alphanumeric
display shows the current hose end sensor temperature and calibration
offset with 0.1°C precision.
The Fault Code Log mode sequentially displays the last 5fault codes stored
in system memory. Please refer to the “Fault Code Table” on page 8 for
more information about a particular fault code.
7
GB / 34-8718-8817-7
The System Information mode allows the technician to view important
system information including the firmware, system identification, serial port
baud rate, 5V power supply status, and the control board serialnumber.
The Over‑temperature Detection Test mode allows the user to test the
operation of the independent over-temperature shutdown system.
Accessing the AlternativeModes
To access the alternative modes, you must press the Alternative Mode
button that is located on the front panel of the warming unit but is
unlabeled. Press the center of the BairHugger logo when the instructions
direct you to press the Alternative Modebutton.
TEMP IN RANGE
FAULT
OVER TEMP
STANDBY
AMBIENT
MODEL 775 43 C
MEDIUM
HIGH
TEMPERATURE
AIR FLOW
38 C
LOW
32 C
System
System
Information
AltMode3
Alternative
Mode button
AltMode0
Over‑temperature
Detection
TestAltMode4
Fault
Code Log
AltMode2
Calibration
AltMode1
Figure 2. Location of Alternative Modebutton
To enter one of the alternative modes, press the Alternative Mode button in
combination with one of the operating mode buttons, also located on the
front panel. Figure 2 indicates which keys must be pressed to enter each of
the 5 alternative modes. When the correct combination of keys is pressed,
the display reads “Hold for AltModeX,” where “X” represents the selected
alternativemode.
Exiting an AlternativeMode
Exit the alternative modes by pressing the Alternative Mode button or by
waiting for 60seconds. You will need to access the alternative modes for
several of the service procedures described in thismanual.
Required PreventativeMaintenance
Note: Auto tester must not interrupt the voltage during warming unit on
power reset or an Error 053/054mayresult.
Calibrating the OperatingTemperature
!
Caution: Perform all temperature testing of the warming unit with a
3M Model 22110temperature testunit.
3M assumes no responsibility for the reliability, safety, or performance
of the BairHugger temperature management system if temperature
tests or adjustments are made in any manner other than those described
here. Improper measurement or adjustment of the warming unit’s normal
operating temperature could result in patient exposure to temperatures
outside of the indicated range and may lead to patient injury.
Service frequency
Every 6 months or 500hours of use, or whenever service isperformed.
Tools/equipment
Model 22110 temperature testunit
Calibrated thermocouple temperature monitor
NOTES:
• The Model 22110temperature test unit simulates the operating
characteristics of 3M warming blankets and gowns when used with
BairHugger warming units.
• When using the Model 22110 temperature test unit, take temperature
readings using a calibrated thermometer that can accept a male,
subminiature connector and read a “K” style thermocouple (e.g., a
Fluke Model 52K/J Thermometer). If the test unit connector does not
fit your thermometer, remove the connector from the test unit and
attach a connector that fits your meter. Be certain to observepolarity.
METHOD
Note: If the warming unit has been stored at a temperature lower than
20°C, allow it to reach ambient temperature before beginning the
calibration procedure.
1. Attach the Model 22110 temperature test unit to the end of the
warming unithose.
2. Connect the warming unit to a grounded power source. The
warming unit performs a self-test and automatically proceeds to
Standbymode.
3. Press the Ambient button to place the warming unit in Ambient
mode. Allow the warming unit to run in Ambient mode for at least
ten minutes to equalize the temperature of the warming unit’s
internalcomponents.
NOTE: Verify warming unit is set to high fan setting by ensuring the
indicator light next to the upper fan is illuminated.
4. Press the Alternative Mode button (see Figure 2. Location of
Alternative Mode button on page 7) and the Ambient button
simultaneously for 3 seconds. The warming unit is now in Calibration
mode. In this mode, the warming unit performs the following tasks:
•32°C and 38°C indicator lights flash indicating they can be used
to adjust the offset value.
• Blower remainson.
• Heater elements remainoff.
•ThetextTMP and the end of hose temperature in °C (0.1°C
resolution) appear in the alphanumeric display.
•ThetextOS and the current calibration offset value (0.1°C
resolution) appear in the alphanumeric display.
5. Compare the temperature shown on the alphanumeric display and the
temperature shown on the thermocouple monitor.
• If the temperatures match, no adjustment is necessary, press
the Alternative Mode button to return the warming unit to
Standby mode.
• If the temperatures do not match, adjust the warming unit
displayed temperature:
a. Press the 32°C button to decrease the temperature or the
38°C button to increase the temperature by 0.1°C. You can
adjust the temperature of the warming unit a maximum
of±3°C.
b. Continue to press the 32°C or 38°C button(s) until the
temperature in the alphanumeric display matches the
temperature on the thermocouple monitor as close
aspossible.
c. Press the Alternative Mode button to store the calibration
offset value and return the warming unit to Standbymode.
Note: If it is necessary to enter an offset value greater than ±3°C, there may
be a defect in the warming unit hose end sensor. Remove warming unit from
service until a new hose assembly can besubstituted.
PDF Scaled at 75.0%

83M™ Bair Hugger™ Warming Unit Model 775 – Service Manual
Testing the Over‑Temperature DetectionSystem
!
Warning: Do not perform the over-temperature detection system test
while the warming unit is being used for warming therapy.
!
Caution: Perform all temperature testing of the warming unit with a
3M Model 22110temperature testunit.
!
Caution: Connect each warming unit being tested to a separate
powersource.
SERVICEFREQUENCY
Every 6 months or 500hours of use, or whenever service isperformed.
TOOLS/EQUIPMENT
Model 22110 temperature testunit
Calibrated thermocouple temperature monitor
Method
Note: If continuing from the previous section (Calibrating the Operating
Temperature) skip to step 4.
Note: If the warming unit has been stored at a temperature lower than
20°C, allow it to reach ambient temperature before beginning thetest.
1. Connect the warming unit to a grounded power source. The
warming unit performs a self-test and automatically proceeds to
Standby mode.
2. Connect the temperature test kit to the hose of the warming unit.
3. Press the Ambient button and allow the warming unit to run for
5 minutes.
NOTE: Verify warming unit is set to the high fan ()setting by ensuring
the indicator light by the upper fan is illuminated.
4. With the warming unit in Ambient mode, press the Alternative Mode
button (See Figure 2. Location of Alternative Mode button on page 7)
and the 43°C button simultaneously for 3 seconds. The warming unit
is now in the Over‑Temperature Detection Test mode. In this mode, the
warming unit performs the following tasks:
• Blower remains ON.
• Heater elements turn ON at fullpower.
•43°C indicator light flashes.
• Over-temperature timer activates.
•OT Test flashes in the alphanumeric display.
5. Wait for the warming unit to perform the over-temperature test. When
the test is complete, the warming unit performs the following tasks:
• Heater elements turnOFF.
• Blower continues to operate. (NOTE: The blower turns off if an
over-temperature condition occurs during normaluse.)
6. View the alphanumeric display to determine testoutcome:
a. PASS–The warming unit detected an over-temperature
condition within 150seconds. An alarm sounds for 2 short
beeps. The text “PASS” flashes in the alphanumeric display,
followed by thesemessages:
i. OT Test ‑ PASS‑Prx or OT Test ‑PASS‑Dst
ii. TestTime ‑ XXSecs
iii. Unplug ‑ ToReset
b. FAIL–Warming unit did not detect an over-temperature
condition within 150 seconds (time-out failure). An alarm sounds
and the Fault indicator light flashes. The text FAIL flashes in the
alphanumeric display, followed by thesemessages:
i. OT Test ‑FAIL
ii. TestTime ‑ 150Secs
iii. Unplug ‑ ToReset
Note: Do not place a warming unit back into service if it fails the
over-temperature test. Contact 3M technicalsupport.
7. Record the maximum temperature displayed by the test kit.
(Use Maintenance Log on page 17.) If the temperature is outside
the range of 46°C to 56°C, contact 3M technical support for
furtherinstructions.
8. After the test is complete, allow the warming unit to cool by running it
for at least five minutes.
9. Unplug the warming unit to reset it to normaloperation.
Viewing the Fault CodeLog
SERVICEFREQUENCY
As often as necessary.
TOOLS/EQUIPMENT
Nonerequired.
METHOD
1. If your warming unit is already ON, you can access the fault code
log from any operating mode. Otherwise, connect the warming unit
to a grounded power source. The warming unit performs a self-test
and automatically proceeds to Standby mode. Then select any
operatingmode.
2. Press the Alternative Mode button (Figure 2. Location of Alternative
Mode button on page 7) and the 32°C button simultaneously for three
seconds. The warming unit is now in Fault Code Log mode. In this
mode, the warming unit performs the followingtasks:
a. Continues to operate in current operatingmode.
b. 32°C and 38°C indicator lightflashes.
c. Text FC(n) XXX appears in the alphanumeric display. FC is
an abbreviation for the phrase fault code nrepresents the
numerical order of the fault code in the log, and XXX represents
the code for the fault condition. See page 9for a list of fault
codes and their meanings.
d. The time (HH:MM:SS) of each fault appears below FC(n) XXX
in the alphanumeric display. If the warming unit reaches 100or
more hours the time only reads hours and minutes.
3. Press either the 32°C or 38°C button to view the next fault code in
the log. The warming unit stores a maximum of 5fault codes in non
volatilememory.
4. Press the Alternative Mode button to return the warming unit to its
previous operatingmode.
Clearing the Fault CodeLog
Put the warming unit in Fault Code mode by pressing the Alternative Mode
button and the 32°C button simultaneously for three seconds; then, press
the 43°Cbutton.
NOTE: The fault code log should not be cleared unless instructed to do so
by a 3M representative.
9
GB / 34-8718-8817-7
Fault Code Table
The software will detect and report the following conditions by displaying
the corresponding fault code:
FAULT CONDITION FAULT CODE
Internal sensor 1 over-temperature condition 001
Hose end sensor 2 over-temperature condition 002
Hose end sensor 3 over-temperature condition 003
Internal sensor 1 shorted 004
Hose end sensor 2 shorted 005
Hose end sensor 3 shorted 006
Hose end sensor 2open 007
Rapid button press, blower failure,
open thermostat or low wattage heater failure
008
Open thermostat/medium wattage heater failure 009
High wattage heater failure 010
A/D converter timeout 011
A/D startup check failed 012
(Reserved Fault Code) 013
Error in execution loop 014
Timeout on alphanumeric display busy flag clearing 015
RAM corruption in duplicate RAM locations 016
Error in executing a depressed key 017
Stuck key during startup 050
EEPROM is at max # write cycles 051
Non-0EEPROM byte detected after zeroing 052
EEPROM checksum failure on copy#1
(see page 11)
053
EEPROM compare failure copy #1 to copy #2 054
EEPROM compare failure copy #1 to RAM 055
EEPROM write cycle time out 056
SPI byte transfer time out 057
EEPROM write error when entering standby 059
Real time clock failure 060
Temperature out of range high 070
Temperature out of range low 071
5 V power supply in excess of 5.333V 100
5V power supply under 4.667 V 101
Startup test EEPROM error 102
Startup test RAM error 103
Viewing the Hour Meter
SERVICEFREQUENCY
As often as necessary.
TOOLS/EQUIPMENT
Nonerequired.
METHOD
1. If your warming unit is already ON, you can begin the test from
any operating mode. Otherwise, connect the warming unit to a
grounded power source. The warming unit performs a self-test
and automatically proceeds to Standby mode. Then select any
operatingmode.
2. Press the Alternative Mode button for 3seconds. (See Figure 2.
Location of Alternative Mode button on page 7.) The warming unit
is now in Hour Meter Display mode. In this mode, the warming unit
performs the followingtasks:
a. Continues to operate in current operatingmode.
b. Hours appears in the alphanumeric display.
c. Cumulative hours of warming unit operation appear in the
alphanumeric display. The time is displayed in whole hours only.
3. Wait 60seconds or press the Alternative Mode button to return the
warming unit to its previous operatingmode.
Viewing the OperatingTimer
To view the amount of time the warming unit has been operating in the
current temperature mode, press and hold the current temperature mode
button for at least 3 seconds. The time is displayed in HH:MM:SSformat.
Replacing the AirFilter
SERVICEFREQUENCY
Every 12 months or 500hours of use.
TOOLS/EQUIPMENT
Replacement airfilter
#2Phillipsscrewdriver
!
Caution: Do not attempt to clean the air filter as it may be
contaminated from use. Discard the filter in a manner consistent with
institutional protocol.
Method
1. Disconnect the warming unit from the grounded powersource.
2. Turn the warming unit upside down.
3. Remove the 2 screws located in the louvered filter cover.
4. Lift the filter cover off the warmingunit.
5. Remove the air filter and discard it.
6. Place the new filter in the filter compartment with the gasket toward
the filter ledge.
7. Replace the filter cover with the louvers facing the back of the
warmingunit.
8. Replace the 2 screws in the filtercover.
Replacing theHose
SERVICEFREQUENCY
As needed.
TOOLS/EQUIPMENT
Replacement hose
Needle-nosepliers
Strapwrench
METHOD
Detaching Warming Unit Hose
1. Disconnect the warming unit from the power source before
replacinghose.
2. Unscrew the hosecollar.
3. Slide the hose out of the warming unit. The hose will still be attached
to the warming unit by a cable.
4. By hand or using a needle-nose pliers, carefully detach the cable
connector from the header plug located inside the hose connector
(see Figure 3. Hosereplacement).
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83M™ Bair Hugger™ Warming Unit Model 775 – Service Manual
Testing the Over‑Temperature DetectionSystem
!
Warning: Do not perform the over-temperature detection system test
while the warming unit is being used for warming therapy.
!
Caution: Perform all temperature testing of the warming unit with a
3M Model 22110temperature testunit.
!
Caution: Connect each warming unit being tested to a separate
powersource.
SERVICEFREQUENCY
Every 6 months or 500hours of use, or whenever service isperformed.
TOOLS/EQUIPMENT
Model 22110 temperature testunit
Calibrated thermocouple temperature monitor
Method
Note: If continuing from the previous section (Calibrating the Operating
Temperature) skip to step 4.
Note: If the warming unit has been stored at a temperature lower than
20°C, allow it to reach ambient temperature before beginning thetest.
1. Connect the warming unit to a grounded power source. The
warming unit performs a self-test and automatically proceeds to
Standby mode.
2. Connect the temperature test kit to the hose of the warming unit.
3. Press the Ambient button and allow the warming unit to run for
5 minutes.
NOTE: Verify warming unit is set to the high fan ()setting by ensuring
the indicator light by the upper fan is illuminated.
4. With the warming unit in Ambient mode, press the Alternative Mode
button (See Figure 2. Location of Alternative Mode button on page 7)
and the 43°C button simultaneously for 3 seconds. The warming unit
is now in the Over‑Temperature Detection Test mode. In this mode, the
warming unit performs the following tasks:
• Blower remains ON.
• Heater elements turn ON at fullpower.
•43°C indicator light flashes.
• Over-temperature timer activates.
•OT Test flashes in the alphanumeric display.
5. Wait for the warming unit to perform the over-temperature test. When
the test is complete, the warming unit performs the following tasks:
• Heater elements turnOFF.
• Blower continues to operate. (NOTE: The blower turns off if an
over-temperature condition occurs during normaluse.)
6. View the alphanumeric display to determine testoutcome:
a. PASS–The warming unit detected an over-temperature
condition within 150seconds. An alarm sounds for 2 short
beeps. The text “PASS” flashes in the alphanumeric display,
followed by thesemessages:
i. OT Test ‑ PASS‑Prx or OT Test ‑PASS‑Dst
ii. TestTime ‑ XXSecs
iii. Unplug ‑ ToReset
b. FAIL–Warming unit did not detect an over-temperature
condition within 150 seconds (time-out failure). An alarm sounds
and the Fault indicator light flashes. The text FAIL flashes in the
alphanumeric display, followed by thesemessages:
i. OT Test ‑FAIL
ii. TestTime ‑ 150Secs
iii. Unplug ‑ ToReset
Note: Do not place a warming unit back into service if it fails the
over-temperature test. Contact 3M technicalsupport.
7. Record the maximum temperature displayed by the test kit.
(Use Maintenance Log on page 17.) If the temperature is outside
the range of 46°C to 56°C, contact 3M technical support for
furtherinstructions.
8. After the test is complete, allow the warming unit to cool by running it
for at least five minutes.
9. Unplug the warming unit to reset it to normaloperation.
Viewing the Fault CodeLog
SERVICEFREQUENCY
As often as necessary.
TOOLS/EQUIPMENT
Nonerequired.
METHOD
1. If your warming unit is already ON, you can access the fault code
log from any operating mode. Otherwise, connect the warming unit
to a grounded power source. The warming unit performs a self-test
and automatically proceeds to Standby mode. Then select any
operatingmode.
2. Press the Alternative Mode button (Figure 2. Location of Alternative
Mode button on page 7) and the 32°C button simultaneously for three
seconds. The warming unit is now in Fault Code Log mode. In this
mode, the warming unit performs the followingtasks:
a. Continues to operate in current operatingmode.
b. 32°C and 38°C indicator lightflashes.
c. Text FC(n) XXX appears in the alphanumeric display. FC is
an abbreviation for the phrase fault code nrepresents the
numerical order of the fault code in the log, and XXX represents
the code for the fault condition. See page 9for a list of fault
codes and their meanings.
d. The time (HH:MM:SS) of each fault appears below FC(n) XXX
in the alphanumeric display. If the warming unit reaches 100or
more hours the time only reads hours and minutes.
3. Press either the 32°C or 38°C button to view the next fault code in
the log. The warming unit stores a maximum of 5fault codes in non
volatilememory.
4. Press the Alternative Mode button to return the warming unit to its
previous operatingmode.
Clearing the Fault CodeLog
Put the warming unit in Fault Code mode by pressing the Alternative Mode
button and the 32°C button simultaneously for three seconds; then, press
the 43°Cbutton.
NOTE: The fault code log should not be cleared unless instructed to do so
by a 3M representative.
9
GB / 34-8718-8817-7
Fault Code Table
The software will detect and report the following conditions by displaying
the corresponding fault code:
FAULT CONDITION FAULT CODE
Internal sensor 1 over-temperature condition 001
Hose end sensor 2 over-temperature condition 002
Hose end sensor 3 over-temperature condition 003
Internal sensor 1 shorted 004
Hose end sensor 2 shorted 005
Hose end sensor 3 shorted 006
Hose end sensor 2open 007
Rapid button press, blower failure,
open thermostat or low wattage heater failure
008
Open thermostat/medium wattage heater failure 009
High wattage heater failure 010
A/D converter timeout 011
A/D startup check failed 012
(Reserved Fault Code) 013
Error in execution loop 014
Timeout on alphanumeric display busy flag clearing 015
RAM corruption in duplicate RAM locations 016
Error in executing a depressed key 017
Stuck key during startup 050
EEPROM is at max # write cycles 051
Non-0EEPROM byte detected after zeroing 052
EEPROM checksum failure on copy#1
(see page 11)
053
EEPROM compare failure copy #1 to copy #2 054
EEPROM compare failure copy #1 to RAM 055
EEPROM write cycle time out 056
SPI byte transfer time out 057
EEPROM write error when entering standby 059
Real time clock failure 060
Temperature out of range high 070
Temperature out of range low 071
5 V power supply in excess of 5.333V 100
5V power supply under 4.667 V 101
Startup test EEPROM error 102
Startup test RAM error 103
Viewing the Hour Meter
SERVICEFREQUENCY
As often as necessary.
TOOLS/EQUIPMENT
Nonerequired.
METHOD
1. If your warming unit is already ON, you can begin the test from
any operating mode. Otherwise, connect the warming unit to a
grounded power source. The warming unit performs a self-test
and automatically proceeds to Standby mode. Then select any
operatingmode.
2. Press the Alternative Mode button for 3seconds. (See Figure 2.
Location of Alternative Mode button on page 7.) The warming unit
is now in Hour Meter Display mode. In this mode, the warming unit
performs the followingtasks:
a. Continues to operate in current operatingmode.
b. Hours appears in the alphanumeric display.
c. Cumulative hours of warming unit operation appear in the
alphanumeric display. The time is displayed in whole hours only.
3. Wait 60seconds or press the Alternative Mode button to return the
warming unit to its previous operatingmode.
Viewing the OperatingTimer
To view the amount of time the warming unit has been operating in the
current temperature mode, press and hold the current temperature mode
button for at least 3 seconds. The time is displayed in HH:MM:SSformat.
Replacing the AirFilter
SERVICEFREQUENCY
Every 12 months or 500hours of use.
TOOLS/EQUIPMENT
Replacement airfilter
#2Phillipsscrewdriver
!
Caution: Do not attempt to clean the air filter as it may be
contaminated from use. Discard the filter in a manner consistent with
institutional protocol.
Method
1. Disconnect the warming unit from the grounded powersource.
2. Turn the warming unit upside down.
3. Remove the 2 screws located in the louvered filter cover.
4. Lift the filter cover off the warmingunit.
5. Remove the air filter and discard it.
6. Place the new filter in the filter compartment with the gasket toward
the filter ledge.
7. Replace the filter cover with the louvers facing the back of the
warmingunit.
8. Replace the 2 screws in the filtercover.
Replacing theHose
SERVICEFREQUENCY
As needed.
TOOLS/EQUIPMENT
Replacement hose
Needle-nosepliers
Strapwrench
METHOD
Detaching Warming Unit Hose
1. Disconnect the warming unit from the power source before
replacinghose.
2. Unscrew the hosecollar.
3. Slide the hose out of the warming unit. The hose will still be attached
to the warming unit by a cable.
4. By hand or using a needle-nose pliers, carefully detach the cable
connector from the header plug located inside the hose connector
(see Figure 3. Hosereplacement).
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10 3M™ Bair Hugger™ Warming Unit Model 775 – Service Manual
Figure 3. Warming Unit HoseReplacement
Reattaching Warming Unit Hose
1. Attach the cable connector of the new warming unit hose to the
header plug, making sure that the protrusions on the connector align
with the corresponding slots on theheader.
2. Align the flat section of the warming unit hose end with the
corresponding flat part of the warming unit’s hose connector and slide
the replacement hose into the warmingunit.
3. Firmly screw the hose collar back into place.
4. Reconnect the warming unit to a grounded powersource.
5. Calibrate operating temperature settings. See page7.
6. Perform over-temperature detection system test. See page 8.
Replacing theFuses
SERVICEFREQUENCY
As needed.
!
Warning: Do not disassemble the warming unit unless you are a
qualified service technician. There are electrically live parts with-in
the warming unit when it is connected to a power source.
Notice: Use proper Electrostatic Discharge (ESD) procedures when
performing maintenance. Failure to do so may result in damage to the
warmingunit.
TOOLS/EQUIPMENT
Phillipsscrewdriver
Wire cutter
Wiretie
Needle-nosepliers
METHOD
1. Detach the warming unit hose (see Detaching Warming Unit Hose on
page 9 forinstructions).
Disassembling the Warming Unit
1. Turn warming unit upside down.
2. Using a Phillips screwdriver, remove the eight screws that secure the
top and bottom enclosurestogether
3. Turn warming unitupright.
4. Remove four screws that attach upper enclosure to backplate.
5. Lift the upper enclosure straight up and disconnect the user interface
wire by squeezing the releasetabs.
6. Replace fuses.
Fuses
Reassembling the Warming Unit
1. Slide the upper enclosure over thechassis.
2. Reinstall the four enclosure screws to attach the upper enclosure
to the back plate. Push down on the top of the warming unit when
tightening the screws to attain proper sealing of theenclosures.
3. Flip the warming unit upside down and replace the eight enclosure
screws. In order to obtain a proper seal and prevent noise, be sure
to tighten these screws fully. If using a power screwdriver, you may
need to increase the torque setting to ensure proper seating. Once
complete, if there is a whistling noise present it is most likely from
these screws not being fullytightened.
4. Reattach the warming unit hose (see Reattaching Warming Unit Hose
on page 10 forinstructions).
11
GB / 34-8718-8817-7
Cleaning, Maintenance andStorage
CleaningInstructions
1. Disconnect the warming unit from the power source beforecleaning.
2. Cleaning should be performed in accordance with hospital practices
for cleaning OR equipment. After every use; wipe the warming unit,
the outside of the warming unit hose, and any other surfaces that may
have been touched. Use a damp, soft cloth and a hospital approved
mild detergent, germicidal disposable wipes, disinfecting towelettes,
or antimicrobial spray.
3. Let air dry or dry with a separate clean soft cloth.
Notice:
Do not use cleaning solutions with greater than 80% alcohol or solvents,
including acetone and thinner, to clean the warming unit or hose. Solvents
may damage the labels and other plasticparts.
Do not immerse the BairHugger warming unit, warming unit parts, or
accessories in any liquid or subject them to any sterilization process.
SERVICEFREQUENCY
As needed.
STORAGE
Store all components in a cool, dry place when not in use.
Troubleshooting
The warming unit software routinely checks unusual operating conditions. If
such a condition occurs, the system may trigger a fault condition and alarm.
The warming unit can be reset by disconnecting the warming unit from the
main power source and allowing 30-60seconds for the system to reset. If
the fault code condition reoccurs, disconnect again and wait 5minutes for
the system to reset. If the fault condition reoccurs upon connection to the
main power source, the warming unit may have a hard-fault or permanent
error. Contact 3M technical support. If the fault does not reoccur upon
connection to the main power source, the warming unit may have a
cautionaryfault.
PERMANENT ERRORS – A FAULT CONDITION ALWAYS OCCURS
AT TURN ON OR AFTER PRESSING A TEMPERATURE SETTING
FAULT CODE POSSIBLE CAUSE SOLUTION
FC-001
FC-002
FC-003
FC-004
FC-005
FC-006
FC-007
Faulty hose end sensor at
patient end.
Replace warming unit hose. Refer to service manual or IFU included with
replacement part forinstructions.
Faulty elbow sensor. Replace elbow sensor. Refer to IFU included with replacement part
forinstructions.
Warming Unit Hose
disconnected from warming
unit (FC-007only).
Reattach warming unit hose.
Calibrate and return toservice.
FC-008
FC-009
FC-010
Faulty heater element or
faulty control board.
Verify fan runs inambient.
Check resistance of J4connector on control board. The resistance may be up to
400Ohms.
White to black
White toblue
White toyellow
If “open”, replace heater. Otherwise, replace controlboard.
Calibrate and return toservice.
FC-050 Defective user interface. Replace userinterface.
Calibrate and return toservice.
FC-053, 054 EEPROM error. Reset microprocessor.
(Press and hold Alternative Mode button and Standby buttons at same time then
connect to power source. Release buttons when Standby light remainson).
Calibrate and return toservice.
FC-100
FC-101
Defective control board. Replace controlboard.
Calibrate and return toservice.
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10 3M™ Bair Hugger™ Warming Unit Model 775 – Service Manual
Figure 3. Warming Unit HoseReplacement
Reattaching Warming Unit Hose
1. Attach the cable connector of the new warming unit hose to the
header plug, making sure that the protrusions on the connector align
with the corresponding slots on theheader.
2. Align the flat section of the warming unit hose end with the
corresponding flat part of the warming unit’s hose connector and slide
the replacement hose into the warmingunit.
3. Firmly screw the hose collar back into place.
4. Reconnect the warming unit to a grounded powersource.
5. Calibrate operating temperature settings. See page7.
6. Perform over-temperature detection system test. See page 8.
Replacing theFuses
SERVICEFREQUENCY
As needed.
!
Warning: Do not disassemble the warming unit unless you are a
qualified service technician. There are electrically live parts with-in
the warming unit when it is connected to a power source.
Notice: Use proper Electrostatic Discharge (ESD) procedures when
performing maintenance. Failure to do so may result in damage to the
warmingunit.
TOOLS/EQUIPMENT
Phillipsscrewdriver
Wire cutter
Wiretie
Needle-nosepliers
METHOD
1. Detach the warming unit hose (see Detaching Warming Unit Hose on
page 9 forinstructions).
Disassembling the Warming Unit
1. Turn warming unit upside down.
2. Using a Phillips screwdriver, remove the eight screws that secure the
top and bottom enclosurestogether
3. Turn warming unitupright.
4. Remove four screws that attach upper enclosure to backplate.
5. Lift the upper enclosure straight up and disconnect the user interface
wire by squeezing the releasetabs.
6. Replace fuses.
Fuses
Reassembling the Warming Unit
1. Slide the upper enclosure over thechassis.
2. Reinstall the four enclosure screws to attach the upper enclosure
to the back plate. Push down on the top of the warming unit when
tightening the screws to attain proper sealing of theenclosures.
3. Flip the warming unit upside down and replace the eight enclosure
screws. In order to obtain a proper seal and prevent noise, be sure
to tighten these screws fully. If using a power screwdriver, you may
need to increase the torque setting to ensure proper seating. Once
complete, if there is a whistling noise present it is most likely from
these screws not being fullytightened.
4. Reattach the warming unit hose (see Reattaching Warming Unit Hose
on page 10 forinstructions).
11
GB / 34-8718-8817-7
Cleaning, Maintenance andStorage
CleaningInstructions
1. Disconnect the warming unit from the power source beforecleaning.
2. Cleaning should be performed in accordance with hospital practices
for cleaning OR equipment. After every use; wipe the warming unit,
the outside of the warming unit hose, and any other surfaces that may
have been touched. Use a damp, soft cloth and a hospital approved
mild detergent, germicidal disposable wipes, disinfecting towelettes,
or antimicrobial spray.
3. Let air dry or dry with a separate clean soft cloth.
Notice:
Do not use cleaning solutions with greater than 80% alcohol or solvents,
including acetone and thinner, to clean the warming unit or hose. Solvents
may damage the labels and other plasticparts.
Do not immerse the BairHugger warming unit, warming unit parts, or
accessories in any liquid or subject them to any sterilization process.
SERVICEFREQUENCY
As needed.
STORAGE
Store all components in a cool, dry place when not in use.
Troubleshooting
The warming unit software routinely checks unusual operating conditions. If
such a condition occurs, the system may trigger a fault condition and alarm.
The warming unit can be reset by disconnecting the warming unit from the
main power source and allowing 30-60seconds for the system to reset. If
the fault code condition reoccurs, disconnect again and wait 5minutes for
the system to reset. If the fault condition reoccurs upon connection to the
main power source, the warming unit may have a hard-fault or permanent
error. Contact 3M technical support. If the fault does not reoccur upon
connection to the main power source, the warming unit may have a
cautionaryfault.
PERMANENT ERRORS – A FAULT CONDITION ALWAYS OCCURS
AT TURN ON OR AFTER PRESSING A TEMPERATURE SETTING
FAULT CODE POSSIBLE CAUSE SOLUTION
FC-001
FC-002
FC-003
FC-004
FC-005
FC-006
FC-007
Faulty hose end sensor at
patient end.
Replace warming unit hose. Refer to service manual or IFU included with
replacement part forinstructions.
Faulty elbow sensor. Replace elbow sensor. Refer to IFU included with replacement part
forinstructions.
Warming Unit Hose
disconnected from warming
unit (FC-007only).
Reattach warming unit hose.
Calibrate and return toservice.
FC-008
FC-009
FC-010
Faulty heater element or
faulty control board.
Verify fan runs inambient.
Check resistance of J4connector on control board. The resistance may be up to
400Ohms.
White to black
White toblue
White toyellow
If “open”, replace heater. Otherwise, replace controlboard.
Calibrate and return toservice.
FC-050 Defective user interface. Replace userinterface.
Calibrate and return toservice.
FC-053, 054 EEPROM error. Reset microprocessor.
(Press and hold Alternative Mode button and Standby buttons at same time then
connect to power source. Release buttons when Standby light remainson).
Calibrate and return toservice.
FC-100
FC-101
Defective control board. Replace controlboard.
Calibrate and return toservice.
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12 3M™ Bair Hugger™ Warming Unit Model 775 – Service Manual
CAUTIONARY ERRORS–FAULT CONDITION
WHILE UNIT IS IN USE
FAULT CODE POSSIBLE CAUSE SOLUTION
FC-001
FC-003
FC-008
Airflow occluded. Disconnect from power source. Remove warming unit hose occlusion. Position
hose end correctly into hose card (refer to the Operator’s Manual). Check for
air intake obstructions on the bottom of the warming unit. Replace filter. Wait
30-60 seconds before reconnecting to the main power source. If no fault occurs,
warming unit is ready for use.
Intermittent elbow sensor
failure.
Disconnect from power source. Allow warming unit to cool. Wait 30-60 seconds
before reconnecting to the main power source.
If these faults continue to occur during use and the airflow is not occluded
replace elbow sensor.
FC-002
FC-003
FC-004
FC-005
FC-006
FC-007
Warming unit hose end
sensor failure at patient end.
Moisture.
Intermittent hose sensor
failure.
High heat.
Disconnect from power source. Allow warming unit to cool. Wait 30-60 seconds
before reconnecting to the main power source. If no fault occurs, warming unit is
ready to use.
If these faults continue to occur during use, replace hose.
Intermittent elbow sensor
failure.
Disconnect from power source. Allow warming unit to cool. Wait 30-60 seconds
before reconnecting to the main power source.
If these faults continue to occur during use and the airflow is not occluded
replace elbow sensor.
FC-070 Warming unit hose end
temperature exceeds the
set point by at least 5°C for
approximately 5 minutes.
Faulty control board.
Unplug the warming unit, then wait 30-60 seconds before reconnecting to the
main power source. If no fault occurs, warming unit Is ready to use.
Replace control board.
Calibrate and return to service.
FC-071 Warming unit hose end
temperature is at least 10°C
below the set point for
approximately 10 minutes.
Faulty control board.
Faulty heater.
Faulty blower.
Unplug the warming unit, then wait 30-60 seconds before reconnecting to the
main power source. If no fault occurs, warming unit Is ready to use.
Replace control board.
Replace heater.
Replace blower.
Calibrate and return to service.
Whistling sound during
operation
Air leaks in enclosure or
warming unit hose.
Faulty bearing in
blower motor.
Tighten all screws.
Check for holes in warming unit hose.
Check for loose warming unit hose collar and presence of O-rings.
Clean the filter gasket and mating surface.
Technical Support and OrderPlacement
USA
TEL: [phone]
OUTSIDE OF THE USA
Contact your local 3Mrepresentative.
When You Call for TechnicalSupport
We will need to know the serial number of your BairHugger warming unit
when you call us. The serial number label is located on the back of the
warmingunit.
In‑Warranty Repair andExchange
USA
Call 3M technical support if your warming unit requires factory service. A
technical support representative will give you a Return Authorization (RA)
number. Please use this RA number on all correspondence concerning
your warming unit. Your technical support representative will also send a
shipping carton to you at no charge, if needed. Call your local supplier or
sales representative to inquire about borrowing a warming unit while we
service your warmingunit.
OUTSIDE THEUSA
Contact your local distributor concerning in-warranty repair andexchange.
Returning Warming Units forService
TOOLS/EQUIPMENT
3M servicecarton
Tape dispenser
Shippinglabel
Markingpen
METHOD
1. Call 3M technical support (see page 12for contact information) to get
a Return Authorization (RA) number and a service carton.
2. Remove the top foam piece. If the plastic liner is available, use it to
enclose the warmingunit.
3. Lower the warming unit carefully into thecarton.
4. Replace the top foam piece. Observe proper orientation. Hose will
extend out in the corner of foam.
5. Lay the warming unit hose on top of the foam piece around theedge.
6. Seal the carton withtape.
7. Apply the shipping label addressed to 3M HealthCare.
8. Write the RA number on the outside of the carton.
9. Ship to 3M HealthCare.
13
GB / 34-8718-8817-7
Specifications
Guidance and manufacturer’s declaration – electromagnetic emissions
The Model 775warming unit is intended for use in the electromagnetic environment specifiedbelow. The customer or the user of the Model
775 warming unit should assure that it is used in such an environment.
Emissions test Compliance Electromagnetic environment ‑guidance
RFemissions
CISPR 11
Group 1 The Model 775 warming unit uses RF energy only for its internal function. Therefore, its RF emissions are
very low and are not likely to cause any interference in nearby electronicequipment.
RFemissions
CISPR 11
Class B The Model 775warming unit is suitable for use in all establishments, including domestic establishments
and those directly connected to the public low-voltage power supply network that supplies buildings
used for domesticpurposes.
Harmonicemissions
IEC 61000-3-2
Class A
Voltagefluctuations/
Flickeremissions
IEC 61000-3-3
Complies
Guidance and manufacturer’s declaration – electromagnetic immunity
The Model 775warming unit is intended for use in the electromagnetic environment specifiedbelow. The customer or the user of the Model
775 warming unit should assure that it is used in such an environment.
Immunity Test IEC 60601 test level Compliance level Electromagnetic environment ‑guidance
Electrostatic
discharge(ESD)
IEC 61000-4-2
±6kV contact
±8kV air
±6kV contact
±8kV air
Floors should be wood, concrete or ceramic tile. If floors are covered with
synthetic material, the relative humidity should be at least 30%.
Electrical
fasttransient/burst
IEC 61000-4-4
±2kV for power
supplylines
±1 kV for input/output
lines
±2kV for power
supplylines
±1 kV for input/output
lines
Mains power quality should be that of a typical commercial or
hospital environment.
Surge
IEC 61000-4-5
±1 kV line toline
±2kV line(s) to earth
±1 kV line toline
±2kV line(s) to earth
Mains power quality should be that of a typical commercial or
hospital environment.
Voltage dips, short
interruptions and
voltage variations
on power supply
input lines
IEC 61000-4-11
<5% UT
(>95% dip in UT)
for 0,5cycle
40% UT
(60% dip in UT)
for 5cycles
70% UT
(30% dip in UT)
for 25cycles
<5% UT
(>95% dip in UT)
for 5sec
<5% UT
(>95% dip in UT)
for 0,5cycle
40% UT
(60% dip in UT)
for 5 cycles
70% UT
(30% dip in UT)
for 25cycles
<5% UT
(>95% dip in UT)
for 5sec
Mains power quality should be that of a typical commercial or hospital
environment. If the user of the Model 775warming unit requires continued
operation during power mains interruptions, it is recommended that the
Model 775warming unit be powered from an uninterruptible power supply
or a battery.
Power frequency
(50/60Hz)
magneticfield
IEC 61000-4-8
3 A/m 3 A/m Power frequency magnetic fields should be at levels characteristic of a
typical location in a typical commercial or hospital environment.
NOTE UTis the a.c. mains voltage prior to application of the test level.
PDF Scaled at 75.0%

12 3M™ Bair Hugger™ Warming Unit Model 775 – Service Manual
CAUTIONARY ERRORS–FAULT CONDITION
WHILE UNIT IS IN USE
FAULT CODE POSSIBLE CAUSE SOLUTION
FC-001
FC-003
FC-008
Airflow occluded. Disconnect from power source. Remove warming unit hose occlusion. Position
hose end correctly into hose card (refer to the Operator’s Manual). Check for
air intake obstructions on the bottom of the warming unit. Replace filter. Wait
30-60 seconds before reconnecting to the main power source. If no fault occurs,
warming unit is ready for use.
Intermittent elbow sensor
failure.
Disconnect from power source. Allow warming unit to cool. Wait 30-60 seconds
before reconnecting to the main power source.
If these faults continue to occur during use and the airflow is not occluded
replace elbow sensor.
FC-002
FC-003
FC-004
FC-005
FC-006
FC-007
Warming unit hose end
sensor failure at patient end.
Moisture.
Intermittent hose sensor
failure.
High heat.
Disconnect from power source. Allow warming unit to cool. Wait 30-60 seconds
before reconnecting to the main power source. If no fault occurs, warming unit is
ready to use.
If these faults continue to occur during use, replace hose.
Intermittent elbow sensor
failure.
Disconnect from power source. Allow warming unit to cool. Wait 30-60 seconds
before reconnecting to the main power source.
If these faults continue to occur during use and the airflow is not occluded
replace elbow sensor.
FC-070 Warming unit hose end
temperature exceeds the
set point by at least 5°C for
approximately 5 minutes.
Faulty control board.
Unplug the warming unit, then wait 30-60 seconds before reconnecting to the
main power source. If no fault occurs, warming unit Is ready to use.
Replace control board.
Calibrate and return to service.
FC-071 Warming unit hose end
temperature is at least 10°C
below the set point for
approximately 10 minutes.
Faulty control board.
Faulty heater.
Faulty blower.
Unplug the warming unit, then wait 30-60 seconds before reconnecting to the
main power source. If no fault occurs, warming unit Is ready to use.
Replace control board.
Replace heater.
Replace blower.
Calibrate and return to service.
Whistling sound during
operation
Air leaks in enclosure or
warming unit hose.
Faulty bearing in
blower motor.
Tighten all screws.
Check for holes in warming unit hose.
Check for loose warming unit hose collar and presence of O-rings.
Clean the filter gasket and mating surface.
Technical Support and OrderPlacement
USA
TEL: [phone]
OUTSIDE OF THE USA
Contact your local 3Mrepresentative.
When You Call for TechnicalSupport
We will need to know the serial number of your BairHugger warming unit
when you call us. The serial number label is located on the back of the
warmingunit.
In‑Warranty Repair andExchange
USA
Call 3M technical support if your warming unit requires factory service. A
technical support representative will give you a Return Authorization (RA)
number. Please use this RA number on all correspondence concerning
your warming unit. Your technical support representative will also send a
shipping carton to you at no charge, if needed. Call your local supplier or
sales representative to inquire about borrowing a warming unit while we
service your warmingunit.
OUTSIDE THEUSA
Contact your local distributor concerning in-warranty repair andexchange.
Returning Warming Units forService
TOOLS/EQUIPMENT
3M servicecarton
Tape dispenser
Shippinglabel
Markingpen
METHOD
1. Call 3M technical support (see page 12for contact information) to get
a Return Authorization (RA) number and a service carton.
2. Remove the top foam piece. If the plastic liner is available, use it to
enclose the warmingunit.
3. Lower the warming unit carefully into thecarton.
4. Replace the top foam piece. Observe proper orientation. Hose will
extend out in the corner of foam.
5. Lay the warming unit hose on top of the foam piece around theedge.
6. Seal the carton withtape.
7. Apply the shipping label addressed to 3M HealthCare.
8. Write the RA number on the outside of the carton.
9. Ship to 3M HealthCare.
13
GB / 34-8718-8817-7
Specifications
Guidance and manufacturer’s declaration – electromagnetic emissions
The Model 775warming unit is intended for use in the electromagnetic environment specifiedbelow. The customer or the user of the Model
775 warming unit should assure that it is used in such an environment.
Emissions test Compliance Electromagnetic environment ‑guidance
RFemissions
CISPR 11
Group 1 The Model 775 warming unit uses RF energy only for its internal function. Therefore, its RF emissions are
very low and are not likely to cause any interference in nearby electronicequipment.
RFemissions
CISPR 11
Class B The Model 775warming unit is suitable for use in all establishments, including domestic establishments
and those directly connected to the public low-voltage power supply network that supplies buildings
used for domesticpurposes.
Harmonicemissions
IEC 61000-3-2
Class A
Voltagefluctuations/
Flickeremissions
IEC 61000-3-3
Complies
Guidance and manufacturer’s declaration – electromagnetic immunity
The Model 775warming unit is intended for use in the electromagnetic environment specifiedbelow. The customer or the user of the Model
775 warming unit should assure that it is used in such an environment.
Immunity Test IEC 60601 test level Compliance level Electromagnetic environment ‑guidance
Electrostatic
discharge(ESD)
IEC 61000-4-2
±6kV contact
±8kV air
±6kV contact
±8kV air
Floors should be wood, concrete or ceramic tile. If floors are covered with
synthetic material, the relative humidity should be at least 30%.
Electrical
fasttransient/burst
IEC 61000-4-4
±2kV for power
supplylines
±1 kV for input/output
lines
±2kV for power
supplylines
±1 kV for input/output
lines
Mains power quality should be that of a typical commercial or
hospital environment.
Surge
IEC 61000-4-5
±1 kV line toline
±2kV line(s) to earth
±1 kV line toline
±2kV line(s) to earth
Mains power quality should be that of a typical commercial or
hospital environment.
Voltage dips, short
interruptions and
voltage variations
on power supply
input lines
IEC 61000-4-11
<5% UT
(>95% dip in UT)
for 0,5cycle
40% UT
(60% dip in UT)
for 5cycles
70% UT
(30% dip in UT)
for 25cycles
<5% UT
(>95% dip in UT)
for 5sec
<5% UT
(>95% dip in UT)
for 0,5cycle
40% UT
(60% dip in UT)
for 5 cycles
70% UT
(30% dip in UT)
for 25cycles
<5% UT
(>95% dip in UT)
for 5sec
Mains power quality should be that of a typical commercial or hospital
environment. If the user of the Model 775warming unit requires continued
operation during power mains interruptions, it is recommended that the
Model 775warming unit be powered from an uninterruptible power supply
or a battery.
Power frequency
(50/60Hz)
magneticfield
IEC 61000-4-8
3 A/m 3 A/m Power frequency magnetic fields should be at levels characteristic of a
typical location in a typical commercial or hospital environment.
NOTE UTis the a.c. mains voltage prior to application of the test level.
PDF Scaled at 75.0%

14 3M™ Bair Hugger™ Warming Unit Model 775 – Service Manual
Guidance and manufacturer’s declaration – electromagnetic immunity
The Model 775warming unit is intended for use in the electromagnetic environment specified below. The customer or the user of the Model
775warming should assure that it is used in such an environment.
Immunity Test IEC 60601 test level Compliance
level
Electromagnetic environment ‑guidance
Conducted RF
IEC 61000-4-6
RadiatedRF
IEC 61000-4-3
3Vrms
150 kHz to 80 MHz
3V/m
80MHz to 2,5 GHz
3Vrms
3V/m
Portable and mobile RF communications equipment should be used no closer to
any part of the Model 775warming unit, including cables, than the recommended
separation distance calculated from the equation applicable to the frequency of
the transmitter.
Recommended separationdistance
d = 1.2
d=1.2 80 MHz to 800MHz
d=2.3 800MHz to 2,5 GHz
where P is the maximum output power rating of the transmitter in watts (W) according
to the transmitter manufacturer and d is the recommended separation distance in
meters(m).
Field strengths from fixed RF transmitters, as determined by an electromagnetic site
surveya, should be less than the compliance level in each frequency range.b
Interference may occur in the vicinity of equipment marked with the following symbol:
NOTE 1 At 80 MHz and 800 MHz, the higher frequency rangeapplies.
NOTE 2 These guidelines may not apply in all situations. Electromagnetic propagation is affected by absorption and reflection from structures, objects
and people.
aField strengths from fixed transmitters, such as base stations for radio (cellular/cordless) telephones and land mobile radios, amateur radio, AM and
FM radio broadcast and TV broadcast cannot be predicted theoretically with accuracy. To assess the electromagnetic environment due to fixed RF
transmitters, an electromagnetic site survey should be considered. If the measured field strength in the location in which the Model 775warming unit
is used exceeds the applicable RF compliance level above, the Model 775warming unit should be observed to verify normal operation. If abnormal
performance is observed, additional measures may be necessary, such as re-orienting or relocating the Model 775warmingunit.
bOver the frequency range 150 kHz to 80 MHz, field strengths should be less than 3V/m.
Recommended separation distancesbetween portable and mobile RF communications equipment and the Model 775 warmingunit
The Model 775warming unit is intended for use in an electromagnetic environment in which radiated RF disturbances are controlled. The customer or
the user of the Model 775warming unit can help prevent electromagnetic interference by maintaining a minimum distance between portable and mobile
RF communications equipment (transmitters) and the Model 775warming unit as recommended below, according to the maximum output power of the
communicationsequipment.
Rated maximum output power of
transmitter W
Separation distance according to frequency of transmitter m
150kHz to 80 MHz
d =1.2
80MHz to 800MHz
d = 1.2
800MHz to 2,5GHz
d =2.3
0,01 0.12 0.12 0.23
0,1 0.38 0.38 0.73
1 1.2 1.2 2.3
10 3.8 3.8 7.3
100 12 12 23
For transmitters rated at a maximum output power not listed above, the recommended separation distance din meters (m) can be estimated using the
equation applicable to the frequency of the transmitter, where Pis the maximum output power rating of the transmitter in watts (W) according to the
transmittermanufacturer.
NOTE 1 At 80 MHz and 800 MHz, the separation distance for the higher frequency rangeapplies.
NOTE 2 These guidelines may not apply in all situations. Electromagnetic propagation is affected by absorption and reflection from structures, objects
and people.
15
GB / 34-8718-8817-7
PhysicalCharacteristics
DIMENSIONS
13” high x 13” deep x 14” wide (33cm high x 33 cm deep x 36cm wide)
WEIGHT
16lb(7.3kg)
RELATIVE NOISELEVEL
53 dBA (High fan setting)
48dBA (Low fansetting)
HOSE
Flexible, compatible with the Model 241blood/fluid warmingset.
Length: 80” (203 cm)
UNIT INTAKEFILTER
MERV 14*
* See Frequently Asked Questions on Filtration (p. 58)
RECOMMENDED FILTERCHANGE
Every 12 months or 500hours ofuse
MOUNTING
Can be clamped to an IV pole, placed on a hard surface, bed rail mount, or
mounted to the rolling cartaccessory.
Temperature Characteristics
RECOMMENDED OPERATINGENVIRONMENT
TEMPERATURE:
15°C-25°C
HUMIDITY:
Max relative humidity 80% (up to 31°C) decreasing linearly to 50% relative
humidity at40°C.
ALTITUDE:
Max2,000m
TEMPERATURECONTROL
Electronicallycontrolled.
HEATGENERATED
High fansetting:
1600BTU/hr (average), 470W(average)
Low fansetting:
1330BTU/hr (average), 390 W (average)
OPERATINGTEMPERATURES
Average temperatures at the end of thehose:
HIGH: 43° ± 1.5°C (109.4° ±2.7°F)
MED: 38° ± 1.5°C (100.4° ±2.7°F)
LOW: 32° ± 1.5°C (89.6° ±2.7°F)
TIME TO REACH OPERATING TEMPERATURE
2 - 5 minutes (dependent on blanket model)
Time required for the contact surface temperature to heat up from 23 ± 2°C
to 37°C (73± 2°F to 99°F).
STORAGE/TRANSPORTTEMPERATURE
-20°C to 45°C (-4°F to 113°F)
Store all components in a cool, dry place when not in use.
SAFETY SYSTEM
THERMOSTAT
Independent electronic circuit; thermal cutoff shuts the heater
OFF to ensure hose end air remains below 46°C to 56°C; back-up
over-temperature detection at hose inlet.
ALARM SYSTEM
Over-temperature (46°C to 56°C): red Over‑temp indicator light flashes,
alarm sounds, heater and blower shut down, operating indicator lights
turn OFF, and the user can no longer adjust the warming unit using the
control panel.
FAULT:
Fault indicator light flashes, alarmsounds.
OVERCURRENT PROTECTION
Dual input fusedlines.
ElectricalCharacteristics
HEATINGELEMENT
1400WResistive
LEAKAGECURRENT
Meets UL 60601-1and IEC 60601-1 requirements.
BLOWERMOTOR
OPERATING SPEED:
4,700rpm (high fansetting)
4,100 rpm (low fansetting)
AIRFLOW:
Up to 48cfm or 23 L/s
POWERCONSUMPTION
Peak: 1550W
Average: 800W
POWER CORD
15 ft., SJT, 3cond., 13A
15 ft., SJT, 3cond., 15A
4.6m, HAR, 3cond., 10A
DEVICERATINGS
110-120VAC, 50/60Hz, 11.7 A, or
220-240 VAC, 50/60 Hz, 7.2A,or
100VAC, 50/60 Hz, 15 A
FUSES
TYPE:
Fast acting ceramic fuses, 250VAC
AMP RATING:
12 A (110 - 120VAC)
8A (220 - 240VAC)
15A (100 VAC)
OPERATING SPEED:
F (Fast Acting)
BREAKINGCAPACITY:
15A, 12A: 750A @ 250 Vac
15A, 12A: 10,000A @ 125 Vac
8A: 200A @ 250 Vac
8A: 10,000 A @ 125 Vac
PDF Scaled at 75.0%

14 3M™ Bair Hugger™ Warming Unit Model 775 – Service Manual
Guidance and manufacturer’s declaration – electromagnetic immunity
The Model 775warming unit is intended for use in the electromagnetic environment specified below. The customer or the user of the Model
775warming should assure that it is used in such an environment.
Immunity Test IEC 60601 test level Compliance
level
Electromagnetic environment ‑guidance
Conducted RF
IEC 61000-4-6
RadiatedRF
IEC 61000-4-3
3Vrms
150 kHz to 80 MHz
3V/m
80MHz to 2,5 GHz
3Vrms
3V/m
Portable and mobile RF communications equipment should be used no closer to
any part of the Model 775warming unit, including cables, than the recommended
separation distance calculated from the equation applicable to the frequency of
the transmitter.
Recommended separationdistance
d = 1.2
d=1.2 80 MHz to 800MHz
d=2.3 800MHz to 2,5 GHz
where P is the maximum output power rating of the transmitter in watts (W) according
to the transmitter manufacturer and d is the recommended separation distance in
meters(m).
Field strengths from fixed RF transmitters, as determined by an electromagnetic site
surveya, should be less than the compliance level in each frequency range.b
Interference may occur in the vicinity of equipment marked with the following symbol:
NOTE 1 At 80 MHz and 800 MHz, the higher frequency rangeapplies.
NOTE 2 These guidelines may not apply in all situations. Electromagnetic propagation is affected by absorption and reflection from structures, objects
and people.
aField strengths from fixed transmitters, such as base stations for radio (cellular/cordless) telephones and land mobile radios, amateur radio, AM and
FM radio broadcast and TV broadcast cannot be predicted theoretically with accuracy. To assess the electromagnetic environment due to fixed RF
transmitters, an electromagnetic site survey should be considered. If the measured field strength in the location in which the Model 775warming unit
is used exceeds the applicable RF compliance level above, the Model 775warming unit should be observed to verify normal operation. If abnormal
performance is observed, additional measures may be necessary, such as re-orienting or relocating the Model 775warmingunit.
bOver the frequency range 150 kHz to 80 MHz, field strengths should be less than 3V/m.
Recommended separation distancesbetween portable and mobile RF communications equipment and the Model 775 warmingunit
The Model 775warming unit is intended for use in an electromagnetic environment in which radiated RF disturbances are controlled. The customer or
the user of the Model 775warming unit can help prevent electromagnetic interference by maintaining a minimum distance between portable and mobile
RF communications equipment (transmitters) and the Model 775warming unit as recommended below, according to the maximum output power of the
communicationsequipment.
Rated maximum output power of
transmitter W
Separation distance according to frequency of transmitter m
150kHz to 80 MHz
d =1.2
80MHz to 800MHz
d = 1.2
800MHz to 2,5GHz
d =2.3
0,01 0.12 0.12 0.23
0,1 0.38 0.38 0.73
1 1.2 1.2 2.3
10 3.8 3.8 7.3
100 12 12 23
For transmitters rated at a maximum output power not listed above, the recommended separation distance din meters (m) can be estimated using the
equation applicable to the frequency of the transmitter, where Pis the maximum output power rating of the transmitter in watts (W) according to the
transmittermanufacturer.
NOTE 1 At 80 MHz and 800 MHz, the separation distance for the higher frequency rangeapplies.
NOTE 2 These guidelines may not apply in all situations. Electromagnetic propagation is affected by absorption and reflection from structures, objects
and people.
15
GB / 34-8718-8817-7
PhysicalCharacteristics
DIMENSIONS
13” high x 13” deep x 14” wide (33cm high x 33 cm deep x 36cm wide)
WEIGHT
16lb(7.3kg)
RELATIVE NOISELEVEL
53 dBA (High fan setting)
48dBA (Low fansetting)
HOSE
Flexible, compatible with the Model 241blood/fluid warmingset.
Length: 80” (203 cm)
UNIT INTAKEFILTER
MERV 14*
* See Frequently Asked Questions on Filtration (p. 58)
RECOMMENDED FILTERCHANGE
Every 12 months or 500hours ofuse
MOUNTING
Can be clamped to an IV pole, placed on a hard surface, bed rail mount, or
mounted to the rolling cartaccessory.
Temperature Characteristics
RECOMMENDED OPERATINGENVIRONMENT
TEMPERATURE:
15°C-25°C
HUMIDITY:
Max relative humidity 80% (up to 31°C) decreasing linearly to 50% relative
humidity at40°C.
ALTITUDE:
Max2,000m
TEMPERATURECONTROL
Electronicallycontrolled.
HEATGENERATED
High fansetting:
1600BTU/hr (average), 470W(average)
Low fansetting:
1330BTU/hr (average), 390 W (average)
OPERATINGTEMPERATURES
Average temperatures at the end of thehose:
HIGH: 43° ± 1.5°C (109.4° ±2.7°F)
MED: 38° ± 1.5°C (100.4° ±2.7°F)
LOW: 32° ± 1.5°C (89.6° ±2.7°F)
TIME TO REACH OPERATING TEMPERATURE
2 - 5 minutes (dependent on blanket model)
Time required for the contact surface temperature to heat up from 23 ± 2°C
to 37°C (73± 2°F to 99°F).
STORAGE/TRANSPORTTEMPERATURE
-20°C to 45°C (-4°F to 113°F)
Store all components in a cool, dry place when not in use.
SAFETY SYSTEM
THERMOSTAT
Independent electronic circuit; thermal cutoff shuts the heater
OFF to ensure hose end air remains below 46°C to 56°C; back-up
over-temperature detection at hose inlet.
ALARM SYSTEM
Over-temperature (46°C to 56°C): red Over‑temp indicator light flashes,
alarm sounds, heater and blower shut down, operating indicator lights
turn OFF, and the user can no longer adjust the warming unit using the
control panel.
FAULT:
Fault indicator light flashes, alarmsounds.
OVERCURRENT PROTECTION
Dual input fusedlines.
ElectricalCharacteristics
HEATINGELEMENT
1400WResistive
LEAKAGECURRENT
Meets UL 60601-1and IEC 60601-1 requirements.
BLOWERMOTOR
OPERATING SPEED:
4,700rpm (high fansetting)
4,100 rpm (low fansetting)
AIRFLOW:
Up to 48cfm or 23 L/s
POWERCONSUMPTION
Peak: 1550W
Average: 800W
POWER CORD
15 ft., SJT, 3cond., 13A
15 ft., SJT, 3cond., 15A
4.6m, HAR, 3cond., 10A
DEVICERATINGS
110-120VAC, 50/60Hz, 11.7 A, or
220-240 VAC, 50/60 Hz, 7.2A,or
100VAC, 50/60 Hz, 15 A
FUSES
TYPE:
Fast acting ceramic fuses, 250VAC
AMP RATING:
12 A (110 - 120VAC)
8A (220 - 240VAC)
15A (100 VAC)
OPERATING SPEED:
F (Fast Acting)
BREAKINGCAPACITY:
15A, 12A: 750A @ 250 Vac
15A, 12A: 10,000A @ 125 Vac
8A: 200A @ 250 Vac
8A: 10,000 A @ 125 Vac
PDF Scaled at 75.0%

16 3M™ Bair Hugger™ Warming Unit Model 775 – Service Manual
CERTIFICATIONS
IEC 60601-1; IEC/EN 60601-1-2; UL 60601-1; CAN/CSA-C22.2, No.601.1;
EN 55011: EN 80601-2-35and in accordance with Canadian/CSA C22.2,
No. 601.1. Classified under the Medical Device Directive as a Class
IIbdevice.
CLASSIFICATION
MEDICAL — GENERAL MEDICAL EQUIPMENT AS TO
ELECTRICAL SHOCK, FIRE AND MECHANICAL HAZARDS
ONLY IN ACCORDANCE WITH UL 60601‑1; CAN/
CSA‑C22.2, No.601.1; ANSI/AAMI
ES60601‑1:2005CSA‑C22.2 No.60601‑1:08; EN
80601‑2‑35; Control No.4HZ8.
Classified under IEC 60601-1Guidelines (and other national versions of the
Guidelines) as Class I, Type BF, Ordinary equipment, Continuous operation.
Not suitable for use in the presence of flammable anesthetic mixtures with
air or with oxygen or nitrous oxide. Classified by Underwriters Laboratories
Inc. with respect to electric shock, fire and mechanical hazards only, in
accordance with UL60601-1
DIAGNOSTICS
A qualified service technician can perform over-temperature detection
system testing, temperature output testing, operating temperature
calibration, and fault codetroubleshooting.
MaintenanceChecklist
FILTERINSPECTION
1. Remove and inspect thefilter.
2. Return filter or replace as necessary.
Note: Replace every 12 months or every 500hours (PN90047).
CALIBRATE THE OPERATING TEMPERATURE
1. Attach the Model 22110 temperature test unit to the end of the
warming unithose.
2. Run in Ambient mode and high fan setting ()for 10minutes.
3. Enter the calibrationmode.
a. Press the Alternate Mode button and Ambient button, together
for approximately 3-seconds.
b. Temperature measured at end of hose will display on LCD.
4. Adjust BairHugger warming unit displayed temperature so it matches
test unit sensor as close as possible (± .1°increments).
a. 32°C button lowers displayedtemperature.
b. 38°C button raises displayedtemperature.
Note: Warming unit can only adjust ± 3.0°C. Try a different hose if more
adjustment is required and call 3M technical support withresults.
5. Save Settings – Press the Alternate Mode button to save
yoursettings.
TEST OVER TEMPERATURE DETECTIONSYSTEM
1. 1. Run in Ambient mode and high fan setting ( ) for 5 minutes.
2. Initiate over-temperaturetest
a. Press the Alternative Mode and 43°C button together for
approximately 3-seconds.
b. Wait as warming unit executes selftest.
c. Two beeps indicate test hascompleted.
3. ReviewResults
a. Observe the temperature is 46°C to 56°C.
b. Pass or fail indicated on display.
17
GB / 34-8718-8817-7
MaintenanceLog
Date Maintenance Action Performed
PDF Scaled at 75.0%

16 3M™ Bair Hugger™ Warming Unit Model 775 – Service Manual
CERTIFICATIONS
IEC 60601-1; IEC/EN 60601-1-2; UL 60601-1; CAN/CSA-C22.2, No.601.1;
EN 55011: EN 80601-2-35and in accordance with Canadian/CSA C22.2,
No. 601.1. Classified under the Medical Device Directive as a Class
IIbdevice.
CLASSIFICATION
MEDICAL — GENERAL MEDICAL EQUIPMENT AS TO
ELECTRICAL SHOCK, FIRE AND MECHANICAL HAZARDS
ONLY IN ACCORDANCE WITH UL 60601‑1; CAN/
CSA‑C22.2, No.601.1; ANSI/AAMI
ES60601‑1:2005CSA‑C22.2 No.60601‑1:08; EN
80601‑2‑35; Control No.4HZ8.
Classified under IEC 60601-1Guidelines (and other national versions of the
Guidelines) as Class I, Type BF, Ordinary equipment, Continuous operation.
Not suitable for use in the presence of flammable anesthetic mixtures with
air or with oxygen or nitrous oxide. Classified by Underwriters Laboratories
Inc. with respect to electric shock, fire and mechanical hazards only, in
accordance with UL60601-1
DIAGNOSTICS
A qualified service technician can perform over-temperature detection
system testing, temperature output testing, operating temperature
calibration, and fault codetroubleshooting.
MaintenanceChecklist
FILTERINSPECTION
1. Remove and inspect thefilter.
2. Return filter or replace as necessary.
Note: Replace every 12 months or every 500hours (PN90047).
CALIBRATE THE OPERATING TEMPERATURE
1. Attach the Model 22110 temperature test unit to the end of the
warming unithose.
2. Run in Ambient mode and high fan setting ()for 10minutes.
3. Enter the calibrationmode.
a. Press the Alternate Mode button and Ambient button, together
for approximately 3-seconds.
b. Temperature measured at end of hose will display on LCD.
4. Adjust BairHugger warming unit displayed temperature so it matches
test unit sensor as close as possible (± .1°increments).
a. 32°C button lowers displayedtemperature.
b. 38°C button raises displayedtemperature.
Note: Warming unit can only adjust ± 3.0°C. Try a different hose if more
adjustment is required and call 3M technical support withresults.
5. Save Settings – Press the Alternate Mode button to save
yoursettings.
TEST OVER TEMPERATURE DETECTIONSYSTEM
1. 1. Run in Ambient mode and high fan setting ( ) for 5 minutes.
2. Initiate over-temperaturetest
a. Press the Alternative Mode and 43°C button together for
approximately 3-seconds.
b. Wait as warming unit executes selftest.
c. Two beeps indicate test hascompleted.
3. ReviewResults
a. Observe the temperature is 46°C to 56°C.
b. Pass or fail indicated on display.
17
GB / 34-8718-8817-7
MaintenanceLog
Date Maintenance Action Performed
PDF Scaled at 75.0%

18 3M™ Bair Hugger™ Warming Unit Model 775 – Service Manual
MaintenanceLog
Date Maintenance Action Performed
19
FR / 34-8718-8817-7
2Table des matières
Introduction..................................................................................................................................................................................21
Description du système de gestion de la température BairHugger™3M™...........................................................21
Indications.............................................................................................................................................................................21
Dénition des symboles.....................................................................................................................................................21
Explication des conséquences correspondant aux mentions d’avertissement .............................................................22
CONTRE-INDICATION : ..................................................................................................................................................22
AVERTISSEMENT : ............................................................................................................................................................22
AVERTISSEMENT : ............................................................................................................................................................22
REMARQUE : ......................................................................................................................................................................22
Utilisation et entretien .......................................................................................................................................................23
À lire avant toute opération de maintenance surl’équipement ................................................................................23
Inspection de sécurité.......................................................................................................................................................23
Présentation de l’appareil de réchauement................................................................................................................23
Mise sous tension et réinitialisation de l’appareil de réchauement.......................................................................24
Modes detempérature......................................................................................................................................................24
Modes de circulationd’air ................................................................................................................................................24
ModeVeille..........................................................................................................................................................................24
Pannes ..................................................................................................................................................................................24
Surchaue............................................................................................................................................................................25
Autres modes ...................................................................................................................................................................... 25
Accès aux autres modes ................................................................................................................................................... 25
Sortie des autresmodes ...................................................................................................................................................25
Entretien préventifnécessaire.................................................................................................................................................25
Étalonnage de la température defonctionnement...................................................................................................... 25
Test du système de détection desurchaue................................................................................................................26
Achage du journal des codes depanne .....................................................................................................................27
Eacement du journal des codes depanne..................................................................................................................27
Tableau des codes depanne............................................................................................................................................ 27
Achage du compteur d’heures.....................................................................................................................................28
Achage du chronomètre de fonctionnement............................................................................................................28
Remplacement du ltre à air............................................................................................................................................28
Remplacement du tuyau ...................................................................................................................................................28
Retrait du tuyau de l’appareil deréchauement..........................................................................................................28
Fixation du tuyau de l’appareil deréchauement .......................................................................................................28
Remplacement des fusibles .............................................................................................................................................28
Démontage de l’appareil de réchauement .................................................................................................................29
Remontage de l’appareil de réchauement..................................................................................................................29
Nettoyage, maintenance et stockage............................................................................................................................29
Dépannage...................................................................................................................................................................................29
Assistance technique etcommandes .....................................................................................................................................31
Caractéristiques techniques ....................................................................................................................................................32
Journal d’entretien .....................................................................................................................................................................37
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