3M Bair Hugger 675 User manual

Normothermia System
13M BairHugger WarmingUnit
Model675
Service Manual
23M BairHugger Appareil
deréchauffement Modèle675
Manuel d’entretien
33M BairHugger Wärmeeinheit
Modell675
Wartungshandbuch
43M BairHugger Unità diriscaldamento
Modello675
Manuale diservizio
53M BairHugger Unidad
decalentamiento Modelo675
Manual de mantenimiento
63M BairHugger verwarmingsunit
Model675
Onderhoudshandleiding
73M BairHugger Värmeenhet
Modell675
Servicemanual
83M BairHugger Varmeenhed
Model675
Servicemanual
93M BairHugger Varmeenhet
Modell675
Servicehåndbok
03M BairHugger Lämmityslaite
Malli675
Huoltokäsikirja
-3M BairHugger Unidade
deaquecimento Modelo675
Manual de instruções
=3M ŪƌƊŹƁž ŦźƎžƊƐƄƏ ŪƌƊƑźƈƌ675
ţƀƔƂƆƎżƁƆƌbƐźƎſƆƏ
H3M BairHugger Aparatgrzewczy
Model675
Instrukcja serwisowa
J3M BairHugger melegítőegység
675-östípus
Szervizkézikönyv
F3M BairHugger Ohřívacíjednotka
Model675
Servisní příručka
Q3M BairHugger Šildymoblokas
675 modelis
Techninės priežiūros vadovas
M3M ƸNjǘǍǚǏnjNJǨǣǏǏ ǝǛǜǚǘǓǛǜnjǘ
ƶǘǎǏǕǦ 675
ƺǝǔǘnjǘǎǛǜnjǘ Ǚǘ ǘNjǛǕǝǐǒnjNJǗǒǨ
d3M BairHugger
Model675IsıtmaÜntes
ServsKılavuzu
_3M BairHugger ل٦ءؑٝزؐؓ٦ىؚٝ劤⡤ٌرٕ675
؟٦ؽأوصُ،ٕU675 2'LjǘǬ' !ƲǰǁȀ' )džǁH 3M Bair Hugger
/DJD'D./E)
SystemSystem
MODEL
675
Model 675
Warming
Unit
Service Manual

Normothermia System
SystemSystem
MODEL
675
Model 675
Warming
Unit
Service Manual
1English........................................... 1
2Français ...................................... 17
3Deutsch .....................................33
4Italiano .......................................49
5Español ......................................65
6Nederlands.................................81
7Svenska...................................... 97
8Dansk .........................................113
9Norsk.........................................129
0Suomalainen ............................145
-Portugués ................................. 161
=ţƈƈƄƊƆƇŹ  177
HPolski.........................................195
JMagyar.......................................211
FČeština.....................................227
QLietuviskai................................243
MƺƽƻƻƴƲƳ 259
dTurkce ......................................277
_傈劤铂293
UƶǻƴLjǞǬ'........................................ 309

English / 34-8720-2487-1 1
1Table of Contents
Product Description of the 3M™ BairHugger™ Temperature ManagementSystem............................................... 3
Indications for Use ...............................................................................................................................................................3
Denition ofSymbols..........................................................................................................................................................3
Explanation of Signal Word Consequences ...................................................................................................................4
CONTRAINDICATION: ...................................................................................................................................................... 4
WARNING: ........................................................................................................................................................................... 4
CAUTION: ............................................................................................................................................................................. 4
NOTICES................................................................................................................................................................................ 4
Proper Use andMaintenance ............................................................................................................................................5
Read Before ServicingEquipment.................................................................................................................................... 5
SafetyInspection ................................................................................................................................................................. 5
Overview....................................................................................................................................................................................... 5
Overview of Model675WarmingUnit............................................................................................................................ 5
Overview of ControlPanel................................................................................................................................................. 5
Important Alarm Symbols and Indicators .......................................................................................................................6
Warming Unit Mode Summary..........................................................................................................................................6
UnitPower-On-Reset ..........................................................................................................................................................6
OperationMode ...................................................................................................................................................................6
StandbyMode ......................................................................................................................................................................6
SleepMode ............................................................................................................................................................................7
FaultConditions ....................................................................................................................................................................7
Over-Temperature Condition ....................................................................................................................................7
Under-Temperature Condition ..................................................................................................................................7
Diagnostic Mode...................................................................................................................................................................7
Diagnostic Mode menu item functionaldescriptions................................................................................................... 8
Exiting the DiagnosticMode..............................................................................................................................................8
Service Procedures .................................................................................................................................................................... 8
Installing and Replacing the PowerCord........................................................................................................................8
Rolling Cart Removal andInstallation..............................................................................................................................8
Attaching thehose ...............................................................................................................................................................9
Removing theHose.............................................................................................................................................................. 9
Testing theAlarm..................................................................................................................................................................9
Replacing the AirFilter........................................................................................................................................................9
Calibrating the Operating Temperature ..........................................................................................................................9
Testing the Over-Temperature DetectionSystem....................................................................................................... 10
Viewing the Fault CodeLog............................................................................................................................................. 10
General Maintenance and Storage....................................................................................................................................... 10
Cleaning Instructions ........................................................................................................................................................ 10
Storage ................................................................................................................................................................................. 10
Troubleshooting ..........................................................................................................................................................................11
Technical Support and Order Placement..............................................................................................................................11
When you call for TechnicalSupport...............................................................................................................................11
In-Warranty Repair and Exchange....................................................................................................................................11
Specications .............................................................................................................................................................................12
Certications ..............................................................................................................................................................................13
Classication ..............................................................................................................................................................................13
Frequently Asked Questions (FAQ) onFiltration...............................................................................................................14
References:..................................................................................................................................................................................14
Maintenance Checklist ............................................................................................................................................................14
Maintenance Log ................................................................................................................................................................15

English / 34-8720-2487-1 3
13M™ BairHugger™ WarmingUnit Model675
ServiceManual
SystemSystem
MODEL
675
PLEASE FORWARD TO BIOMEDICAL
ENGINEERING DEPARTMENT
Bair Hugger Model 675 Warming Unit Service Manual
For information on operating the Model 675 Warming Unit, please refer to the Model
675 Operator’s Manual
Product Description of the 3M™ BairHugger™ Temperature
ManagementSystem
The BairHugger temperature management system consists of a Model675warming
unit (with optional rolling cart and other accessories) along with a 3M warming blanket
or a BairHugger warminggown.
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 unit and flows through the
warming unit hose into the blanket or gown. Depending on the model, the 3M blanket
or gown is placed either over, around or underneath the patient. Small perforations
on the blanket or gown allow the warm air to be dispersed over the patient’s skin. For
additional information on 3M warming blankets, gowns, or other accessories visit us
online at bairhugger.com.
This manual includes service instructions and specifications for the
Model675Warming Unit. You can use the Model675Warming Unit in all clinical
settings to provide patient temperature management. For information about using 3M
BairHugger warming blankets or gowns with the Model675warming unit, refer to the
respective Instructions forUse.
Indications forUse
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.
Connection point for a potential equalization conductor.
Fuse
Type BF applied part
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
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
Ambient air (Room temperature air)
32° C (89.6° F)
38° C (100.4° F)
43° C (109.4° F)
Stop use: Service required
Over-temperature - Stop use: Service required
Under-temperature - Stop use: Service required
Power button
Filter time limit has been reached
Drip proof protection of fluids
Use only 3Mwarming units and 3Mwarming blankets or
gownstogether

43M Bair Hugger Model 675 Warming Unit – Service Manual
Do not operate the BairHugger warming unit with the hose
detached from the 3Mwarming blanket/gown
Maximum safe working load of combination of warming unit
mounted on Rolling Cart accessory.
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 warming unit Model675has been designed to
operate safely ONLY with 3Mdisposable warming blankets and
gowns. 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warming
blankets and gowns. (See www.bairhugger.com for list of
3Mdisposable warming blankets and gowns.)
• Do not treat patients with the BairHugger warming unit hose alone.
Always attach the hose to a 3Mwarming blanket/gown before
providing 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 place the warming blanket/gown directly over a dispersive
electrodepad.
• 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.
• 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, ensure the warming channels are not occluded.
• 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 connect a torn or damaged warming blanket/gown to the warming unit.
• Do not leave patients with poor perfusion unmonitored during prolonged
warming therapy.
• Do not leave neonates, infants, children, and other vulnerable patient
populations unattended during warming therapy.
• Do not continue warming therapy if the red Over-temp symbol illuminates
and the alarm sounds. Unplug the warming unit and contact a qualified
servicetechnician.
• 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 3Msupplied 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 warming unit, power cord or
any component is damaged. Contact 3MTechnical Support.
• Do not disassemble the warming unit unless you are a qualified service
technician. There are electrically live parts within the unit when it is connected
to a power source.
• Connect each warming unit being tested to a separate power source.
• Do not attempt to replace the filter while the warming unit is in use.
CAUTION:
To reduce the risk of cross-contamination:
• Except for specific BairHugger warming blanket models, 3Mwarming 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.
• Follow applicable regulations when disposing of this warming unit or any of its
electrical components.
• Clean the warming unit and the outside of the warming unit hose after
each patient use. See the “Cleaning Instructions” section under “General
Maintenance andStorage”.
• 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 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 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.
• Do not place the warming unit and rolling cart on an inclined surface of more
than 7degrees with rear caster facing downward angle.
• Do not attempt to move the rolling cart when the front casters are locked.
CAUTION: To reduce the risk 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 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 intake 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.
• Only use 3M-supplied power cord with the warming 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 electrostatic 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.

English / 34-8720-2487-1 5
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 not performed by a qualified, medical equipment
service technician who is familiar with good practice for medical devicerepair.
• The unit is used in a manner other than that described in the Operator’s or
ServiceManuals.
• The unit is installed in an environment that does not meet the appropriate
electrical and groundingrequirements.
• The warming unit is 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. No further 3Mwarming unit-specific special training, licensing or
certification is required for servicing of Model675warming unit. If service does not
require the manufacturer’s attention, the Model675Service Manual provides the
technical information needed to service the unit. Perform all repairs and maintenance
in accordance with the instructions in the Model675Service Manual. For additional
service information please contact 3MTechnicalSupport.
SafetyInspection
Perform a safety inspection after making repairs to the BairHugger
Model675warming unit and before returning the 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.
Overview
Overview of Model675WarmingUnit
The figure below illustrates the location of the warming unitfeatures.
Control
Panel
Carrying
Handle
IV Pole
Clamp
Warming Unit
Hose
SystemSystem
MODEL
675
Power
Cord
Warming Unit
Hose
Front
Equipotential
Stud
Back
Overview of ControlPanel
The front control panel button locations and indicators are described and illustrated in the figurebelow.
Display Screen (LCD):
• Shows temperature of air coming out of
thehose
Temperature Settings:
• (Ambient)
• 32° C (89.6° F)
• 38° C (100.4° F)
• 43° C (109.4° F)
Green LED:
• Shows selected temperature setting
Power:
• Green = On
• Amber = Standby

63M Bair Hugger Model 675 Warming Unit – Service Manual
Important Alarm Symbols andIndicators
The Model675unit’s visual and audible alarms are classified as Low Priority per
IEC80601-2-35.
During a fault condition, the warming unit LCD screen will display a fault condition
indicator, the audible alarm will sound and the warming unit will be inoperable (blower
and heater will turn off). The figure below wrench on the LCD screen which indicates
“Stop use: Service required”condition.
“Service Required” Indicator Displayed on LCD Screen
Stop Use:
Service Required
Over-temperature
(Red)
Under-temperature
(Blue)
“Service Required” Indicators
Actions to take when a warming unit encounters alarm:
•Stop use: Service required.
•Audible alarm will sound: To silence the alarm press the Power button.
•Do not re-start.
Refer to the “Fault Conditions” section for additional information onfaults.
Filter time has beenreached:
The “Change Filter” indicator will display on the LCD screen when the filter time has
beenreached.
“Change Filter”
Indicator
“Change Filter” Indicator Displayed on LCD Screen
Actions to take when filter indicator is illuminated:
• Continue current use.
• After current use: Filter should be changed by service personnel.
• Filter change indicator will stay illuminated, even when the warming unit is in
standby mode.
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.
Warming Unit ModeSummary
The table below summarizes the warming unit indicators and blower/heater operating states for the different operating modes. Each mode is described in further detail after
thetable.
Mode Power Button LCD Screen Temperature Indicators Audible Blower Heater
Power-On-Reset Amber to Green BairHugger Logo All on 1beep Off Off
Operation Green Temperature Selected temperature Off On On
Standby Green BairHugger Logo Off Off Off Off
Sleep Amber Blank, Dark Off Off Off Off
Fault Amber Fault Indicator Off 1beep/sec Off Off
Diagnostic Green Diagnostic menu Off Off Off On for selectedtest
UnitPower-On-Reset
The Model675Warming Unit automatically performs the following sequence after
the warming unit powers on or resets when connected to a properly grounded
powersource:
• Performs all self-testfunctions.
• Illuminates indicator lights and the LCD screen displays the Start-up screen
(BairHuggerlogo).
• The Power button indicator illuminates amber and thengreen.
• Sounds the alarm (1beep).
• System timeractivates.
• The Power button indicator illuminates amber and the unit enters the
Sleep mode.
OperationMode
The warming unit delivers temperature conditioned air during Operation mode. There
are four temperature setting options within Operation mode: Ambient, 32°C, 38°C
and43°C.
To select the Ambient, 32°C, 38°C, or 43°C temperature, press the button labeled with
the desired temperature setting. The temperature management unit will operate within
the specified temperature range, shown in the tablebelow.
Temperature Setting Temperature of DeliveredAir
Ambient Unit will supply air atroom-temperature
32°C 32°C ±3°C
38°C 38°C ±3°C
43°C 43°C ±3°C
After you select an Operation mode temperature setting, the following eventsoccur:
• Corresponding temperature setting indicator lightilluminates.
• Bloweroperates.
• Heater activates except in Ambientmode.
• Operation timer, blower timer, and filter timeractivate.
• System timer remainsactive.
• The LCD displays the temperature at the hose connection to theblanket.
To exit Operation mode, press the Power button. The warming will enter Sleepmode.

English / 34-8720-2487-1 7
StandbyMode
The Standby mode is a temporary state that lasts a maximum of 10seconds and the
Bair Logo is displayed on the LCDscreen.
To enter Standby mode, press the Power button from Sleepmode.
To exit Standby mode, either: a) Press the Bair Logo for three seconds to enter
Diagnostic mode; or b) Wait 10seconds and the unit will go into Sleepmode.
SleepMode
During Sleep mode, the warming unit is idle and awaiting user activation. When in
Sleep mode the following eventsoccur:
• System timer remainsactive.
• The LCD goesblank.
• The Power indicator illuminatesamber.
To enter Sleep mode, press the Power button from either the Diagnostic mode or
Operationmode.
To exit Sleep mode, either: a) Press the Power to enter Standby mode; or, b) Press a
temperature button to enter Operationmode.
FaultConditions
The Model675warming unit’s software recognizes several nonhazardous fault
conditionsincluding:
• Sensorfailures.
• Microprocessorfailures.
• Softwarefailures.
• Keypadfailures.
• Power supplyfailure.
• Temperature out ofrange.
When a fault condition exists, the following eventsoccur:
• Blower turnsoff.
• Heater turnsoff.
• Audible alarmsounds.
• Fault wrench appears on LCDscreen.
• Fault code appears on LCDscreen.
• Up to 20fault codes are stored inmemory.
Silence Alarm/ResetUnit
• When the audible alarm sounds, press the Power button on the keypad to
silenceit.
• The warming unit must be unplugged before it can be used. See “Viewing the
Fault Code Log” and the “Fault Code Table” for more information about specific
faultcodes.
Over-TemperatureCondition
An independent electronic thermal cutoff safety circuit shuts the heater off to ensure
the hose end air remains below 56°C if an over-temperature condition is detected. An
over-temperature condition occurs when one of the following isdetected:
1. The independent thermal cutoff safety circuit senses the air exiting the unit
exceeds 53°C[±3°C].
2. The temperature exceeds 47°C for 30seconds.
3. The temperature is 3°C above set point for 3minutes.
When an over-temperature condition exists, the following eventsoccur:
• Over-temperature indicator and fault
condition wrench alternate displaying
in the LCDscreen.
• Audible alarmsounds.
• Blower and heater turnoff.
The warming unit must be unplugged before it can beused.
Under-TemperatureCondition
An under-temperature condition occurs when the warming unit detects the
temperature set point has not been reached or maintained during use. It occurs when
the temperature is less than 3°C below the selected temperature for 3minutes.
When an under-temperature condition exists, the following eventsoccur:
1. Under-temperature indicator and fault
condition wrench alternate displaying
in the LCDscreen.
2. Audible alarmsounds.
3. Blower and heater turnoff.
The warming unit must be unplugged before it can beused.
DiagnosticMode
The BairHugger Model675has a diagnostic mode that allows access to the service
and calibration utilities of the unit. You will need to access the diagnostic menu for
several service procedures described in thismanual.
To access Diagnostic mode, press and hold the Diagnostic Mode button (i.e. Bair
Logo) for three seconds. The Diagnostic Mode, Ambient, 32, 38, and Power buttons
are used to access Diagnostic mode, navigate through the Diagnostic Menu items, and
exit Diagnostic mode. The figure and accompanying table below show the front panel
button locations and functions used in Diagnosticmode.
DIAGNOSTICS MENU
FILTER TIMER
CALIBRATION
SYSTEM TEST
OT TEST
Scroll Up
Exit
Diagnostic
Mode
Select Menu
Item
Access Diagnostic
Mode/Main Menu
Scroll Down
Bair Hugger Button Functions in Diagnostic Mode
Button Action WhenPressed
Diagnostic
Mode
• Hold for 3seconds to access Diagnostic mode. The warming
unit must be in Standby mode or Fault mode to access
Diagnosticmode.
• When in any Diagnostic mode screen, press to go to the
DiagnosticMenu.
32 • Scroll down a Diagnostic Menuitem
38 • Scroll up a Diagnostic Menuitem
Ambient • Select a Diagnostic Menuitem.
Power • Exit Diagnostic mode and return the warming unit to
Sleepmode.
The figure below illustrates the Diagnostic Mode menu structure and the associated
menuitems.
DIAGNOSTIC MENU
FILTER TIMER
CALIBRATION
SYSTEM TEST
OT TEST
SYSTEM INFO
FAULT LOG
BLOWER TIMER
43C
170W
340W
680W

83M Bair Hugger Model 675 Warming Unit – Service Manual
Diagnostic Mode menu item functionaldescriptions.
FILTER TIMER – Used to view the current filter timer and reset the filtertimer.
CALIBRATION – Used to adjust the temperature offset to calibrate the unit. The
warming unit uses the offset value to account for any temperature variation within the
warming unit and the heat loss through the hose to match the temperature displayed
on the LCD screen with the temperature of the air existing the hose. Calibration is
performed at43°C.
SYSTEM TEST – Used to view sensor, blower speed (RPM), and power information in
detail. The table below details the available tests to run andview.
Test* Action LCD Screen Description
43C
Turns the heater and
blower on and warms
the delivered air to the
43C set point for up to
30minutes
Display xx.x Calibrated hose endtemperature
PCS xx.x Non-calibrated control
sensortemperature
PMS xx.x Monitor sensortemperature
RPMxxxx Blowerspeed
POWER xxx
Calculated power consumption
based upon heat usage and
dutycycle
170W
Turns the 170W heater
and blower on for
20seconds
340W
Turns the 340W heater
and blower on for
20seconds
PCS xx.x Non-calibrated control
sensortemperature
PMS xx.x Monitor sensortemperature
RPM xxxx Blowerspeed
680W
Turns the 680W
heater and blower on
for 20seconds
*Depress the Ambient button to interrupt the test and return to the
SYSTEMTESTscreen
OT Test – Used to verify operation of the over-temperature monitoringsystem.
SYSTEM INFO – Used to view system timers and otherinformation.
LCD Screen Description
SYS TIMERhh:mm Total time the unit has been plugged into a
powersource
OP TIMERhh:mm Total accumulated time the unit has been running in
Ambient, 32°C, 38°, 43°modes
FIRMWAREx Current firmware version loaded in warmingunit
POWER SUPPLY xx.x Monitor sensortemperature
Displays the 24volt power supply output involts
FAULT LOG – Displays the most recent 20faults of the warming unit on the LCD
screen in n FCx hh:mmformat.
LCD Screen* Description
1-FC-hh:mm n = Numerical order of fault code in thelog
: FC = Abbreviation for “faultcode”
n-FC-hh:mm x = Code for the faultcondition
:hh:mm = OP TIMER time the fault condition occurred,
(hh = hours; mm =minutes)
20-FC-hh:mm
*Depress the 32and 38buttons to scroll through thefaults
BLOWER TIMER – Displays the total time the blower has been active in hh:mm format
(hh = hours; mm =minutes).
Exiting the DiagnosticMode
Exit the Diagnostic mode by pressing the Power button or by waiting 60seconds with
noactivity.
ServiceProcedures
Installing and Replacing the PowerCord
ServiceFrequency
Asneeded
Tools/Equipment
• #2Phillipsscrewdriver
Method
1. Disconnect the warming unit from the grounded powersource.
2. If the warming unit is mounted to a rolling cart, remove the rolling cart
(See “Rolling Cart Removal and Installation”section).
3. Turn the warming unit upside down and support the warmingunit.
4. Remove the screws securing the two power cord clamps inplace.
Power Cord
Power Cord Clamp
Screw Location
Power Cord Clamp ScrewLocation
5. If replacing the power cord, pull the plug of the old cord out of the warming
unit and remove the power cord from the channel leading to the side of the
warmingunit.
6. Insert the plug of the new cord into the unit. (Use only 3Msupplied
powercords).
7. Route the power cord in the channel to the side of the warmingunit.
8. Replace the two power cord clamps to secure the power cord inplace.
9. If the warming unit was attached to a rolling cart, reinstall on the rolling cart
(See “Rolling Cart Removal and Installation”section).
10. Connect the warming unit to a properly grounded powersource.
Rolling Cart Removal andInstallation
ServiceFrequency
Asneeded
Tools/Equipment
• None
Method
1. Disconnect the warming unit from the grounded powersource.
2. Cart Removal: Gently pull on the front tab on the cart, lift the front and rotate
backward to detach the unit off thecart.
System
MODEL
675
CartRemoval

English / 34-8720-2487-1 9
3. Cart Installation: Place the unit in the center of the cart with the warming unit
feet aligned with the recesses in thecart.
(Note: The front rolling cart casters arelockable.)
System
MODEL
675
CartInstallation
4. Push down to snap the warming unit inplace.
Attaching thehose
ServiceFrequency
Asneeded
Tools/Equipment
• Hose
Method
1. Align the triangle on top of the warming unit hose
connection with the notched groove on the hoseend.
2. Push the hose in and turn clockwise approximately ¼ turn
until it snaps intoplace.
Removing theHose
ServiceFrequency
Asneeded
Tools/Equipment
• None
Method
1. Hold the warming unit end of the hose and rotate
counter-clockwise approximately ¼ turn until
itstops.
2. Pull the hose straight out of the warmingunit.
Testing theAlarm
ServiceFrequency
Asneeded
Tools/Equipment
• None
Method
1. Connect the warming unit to a grounded powersource.
2. Verify the alarm sounds for approximately one beep and thensilences.
Replacing the AirFilter
ServiceFrequency
Every 12months or 500hours ofuse.
The Change Filter indicator will display on the LCD screen after 500hours
ofuse.
Tools/Equipment
• Replacement air filter (Use only 3Msupplied 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. If the warming unit is mounted to a rolling
cart remove the cart by gently pulling on
the front tab on the cart and lifting the
warming unit off thecart.
3. Turn the warming unit upsidedown.
4. Remove the 2screws located in the
bottom of the warmingunit.
5. Lift the filter cover off the warmingunit.
6. Remove the air filter and discardit.
7. Place the new filter in the filter
compartment in eitherorientation.
8. Replace the filter cover on the
warmingunit.
9. Replace the 2screws in the filtercover.
10. If the warming unit was attached to a
rolling cart, place the warming unit in the
center of the cart and push down to snap
it inplace.
11. Connect the warming unit to a properly
grounded powersource.
12. Access the Diagnostic mode (see Diagnostic Modesection).
13. Navigate to the FILTER TIMER menu option and select it by pressing the
Ambientbutton.
14. Reset the filter timer by highlighting Yes and pressing the Ambientbutton.
15. Verify the filter time displayed at the top of the LCD screen displays0.0.
16. Exit the Diagnostic Menu by pressing the Powerbutton.
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
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 12months or 500hours ofuse.
Tools/Equipment
• Model 22110Temperature TestUnit
• Calibrated thermocouplemonitor
Notes:
• The Model 22110temperature test unit simulates the operating characteristic of
3Mblankets and gowns when used with the warmingunit.
• When using the Model 22110temperature test unit, take temperature readings
using a calibrated thermocouple monitor that can accept a male, subminiature
connector and read a “K” style thermocouple (e.g., a Fluke 52 K/J Thermometer).
If the test unit’s connector does not fit your thermocouple monitor, remove the
connector from the test unit and attach a connector that fits your monitor. Be
certain to observepolarity.
Method
1. Connect the warming unit to a grounded power source. The unit performs a
self-test and automatically proceeds to Standbymode.
2. Connect the temperature test unit to the end of the warming unit hose by fully
inserting the hose end up to the hose card stopflange.
3. Access the Diagnostic mode (see Diagnostic Modesection).
4. Navigate to the CALIBRATION menu option then press the Ambient button.
The warming unit is now in Calibration mode. In this mode, the warming unit
performs the followingtasks:
• Blower turnsON.
• Heater elements turnON.
• The LCDdisplays:
a. The text “DISPLAY” followed by the calibrated temperature of the air
exiting the warmingunit.
b. The text “OFFSET” followed by the offset value. The offset value is the air
temperature difference between the warming unit hose connection (i.e.
air entering the hose) and the hose end (i.e. air exiting thehose).
5. Wait for the temperature shown on the warming unit’s LCD display to stabilize
at 43.0°C ± 0.1°C (about 3-5minutes).
6. Compare the temperature shown on the LCD display and the temperature of
the thermocouple (test kit)monitor.
• If the temperatures match, press the Ambient button to save and return
to the Diagnostic Mode mainscreen.
System
MODEL
675
Filter
Screws
Filter Cover

10 3M Bair Hugger Model 675 Warming Unit – Service Manual
• If the temperatures do not match, adjust the warming unit’s
displayedtemperature:
a. Press the 32button to decrease the temperature or the 38button to
increase the temperature OFFSET value by0.1°C.
b. Wait for the DISPLAY temperature shown on the warming unit’s LCD
display to stabilize at 43.0°C ±0.1°C.
c. Continue to press the 32or 38button(s) until the DISPLAY temperature
in the LCD screen matches the temperature on the thermocouple
monitor as close aspossible.
d. Press the Ambient button to save the offsetsetting.
e. Press the Diagnostic Mode button to return to the Diagnostic Mode
main screen or the Power button to return to Sleepmode.
Note: If it is necessary to enter an offset value greater than ± 10°C, there may be
a defect in the warming unit’s sensor. Remove the unit from service until it can
berepaired.
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
Connect each warming unit being tested to a separate powersource.
ServiceFrequency
Every 12months or 500hours ofuse.
Tools/Equipment
• Model 22110Temperature TestUnit
• Calibrated thermocouplemonitor
Method
1. Connect the warming unit to a grounded power source. The unit performs a
self-test and automatically proceeds to Standbymode.
Note: Ambient room temperature must be ≥ 20°C.
2. Connect the temperature test unit to the end of the warming unit hose by fully
inserting the hose end up to the hose card stopflange.
3. Access the Diagnostic mode (see Diagnostic Modesection).
4. Navigate to the OT TEST menu option then press the Ambient button. The
warming unit is now in OT TEST mode. In this mode, the warming unit performs
the followingtasks:
a. Blower runs for 3minutes.
b. Heater elements remainOFF.
c. LCD screen displays “PREPARING FOR OTTEST”
5. After 3minutes the warming unit performs the followingtasks:
a. Blower remainsON.
b. Heater elements turnON.
c. Over-temperature timeractivates.
d. LCD screen displays “TEST INPROGRESS”.
6. Wait for the warming unit to complete the over-temperature test (up to
210seconds). When the test is complete, the warming unit performs the
followingtasks:
a. Heater elements turnOFF.
b. Blower turnsOFF.
c. The audible alert sounds if the OT test completessuccessfully.
d. The LCD displays ”SENSOR OT DETECTED AFTER xx SECONDS
UNPLUG TO RESET” if the OT test completessuccessfully,
e. The LCD displays “SENSOR OT NOT DETECTED UNPLUG TO RESET” if
the OT test does not completesuccessfully.
Note: If the LCD displays “SENSOR NOT DETECTED UNPLUG TO
RESET” do not place the warming unit back into service and contact
3Mtechnicalsupport.
7. Verify the blower turnsoff.
8. Verify the maximum temperature measured by the temperature test unit at the
end of the hose is less than56°C.
Note: If it is 56°C or higher or the blower does not shut off, do not place the
warming unit back into service and contact 3Mtechnicalsupport.
9. Unplug the warming unit to return it to normaloperation.
10.Allow the unit to cool for at least five minutes before returning toservice.
Viewing the Fault CodeLog
ServiceFrequency
As often asnecessary.
Tools/Equipment
Nonerequired.
Method
1. Connect the warming unit to a grounded power source. The unit performs a
self-test and automatically proceeds to Sleepmode.
2. Access the Diagnostic mode (see Diagnostic Modesection).
3. Navigate to the FAULT LOG menu option then press the Ambient button. The
warming unit is now in FAULT LOG mode. In this mode, the warming unit
performs the followingtasks:
a. Blower remainsOFF.
b. Heater elements remainOFF.
c. The LCD displays faultcodes.
4. Press the 32and 38buttons to scroll through fault codes in the log. The
temperature management unit stores a maximum of 20faultcodes.
The table below summarizes the available fault codes and fault conditions. See the
“Troubleshooting” section for additionaldetails.
Fault Code FaultCondition
01 Control sensorfailure
02 Control sensor at least 47°C over-temperaturecondition
03 Monitor sensorfailure
04 Monitor or Control sensor over-temperaturecondition
50 Stuckkey
51 Blowerfailure
52 Watchdog timerfailure
70 Temperature out of rangehigh
71 Temperature out of rangelow
72 Rate of temperature increaseinsufficient
73 Control sensor and monitor sensormismatch
General Maintenance andStorage
ServiceFrequency
Asneeded.
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 in any liquid or subject it to any
sterilization process as this may damage the warming unit or itsparts.
Storage
Store all components in a cool, dry place when not inuse.

English / 34-8720-2487-1 11
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.
If the fault does not reoccur upon connection to the main power source, the warming unit may have a cautionaryfault.
Fault Code Fault Condition Possible Cause Troubleshooting
01 Control sensor output
ishigh
1. Sensor boardfailure.
2. Control boardfailure.
3. Internal wire harness failure.
1. Check for moisture onsensor.
2. Perform the 43C test in the System Test option of the Diagnostic Menu.
Verify the end of hose temperature is 43°C ± 3°C using the Model
22110temperature test unit and calibrated thermocouplemeter.
02 Control sensor measures ≥
47°C for 30seconds
1. Control boardfailure.
2. AC board failure(TRIAC).
3. Sensor boardfailure.
4. Internal wire harness failure.
1. Perform Operating Temperaturecalibration.
2. Measure the hose end temperature using the Model 22110temperature
test unit and calibrated thermocouple meter while running in Ambient
mode. The measured temperature should be ±3°C of the ambient
roomtemperature.
03 Monitor sensor output
ishigh
1. Sensor boardfailure.
2. Control boardfailure.
3. Internal wire harness failure.
1. Check for moisture onsensor.
2. Perform the 43C test in the System Check option of the Diagnostic
Menu. Verify the end of hose temperature is 43°C ± 3°C using the Model
22110temperature test unit and calibrated thermocouplemeter.
04 Software detects an
over-temperature
circuitcutout
1. Control boardfailure.
2. Sensor boardfailure.
3. Internal wire harness failure.
1. Perform Operating Temperaturecalibration.
2. Measure the hose end temperature using the Model 22110temperature
test unit and calibrated thermocouple meter while running in Ambient
mode. The measured temperature should be ±3°C of the ambient
roomtemperature.
50 Software detects any button
pressed for 5seconds.
1. Useraction.
2. User interface circuit board failure.
1. Reset microprocessor by disconnecting the warming unit from the main
power source and allowing 30-60seconds for the system toreset.
51 The blower is running at ≤
2000RPM for 1minute, or
there is no output to the
control board for 3seconds
1. Blowerfailure.
2. Control boardfailure.
3. Internal wire harness failure.
1. Test blower using the System Info screen in Diagnosticmode.
52 Watchdog timer failed 1. Control board failure. 1. Reset microprocessor by disconnecting the warming unit from the main
power source and allowing 30-60seconds for the system toreset.
70 The control sensor measures
the temperature to be +3°C
greater than the set point for
3minutes.
1. Control boardfailure.
2. Air flow occlusion.
1. Check hose forobstructions.
2. Check the air intake on the bottom of the unit forobstructions.
3. Check for blockedfilter.
4. Test all 3heater wattages using the System Test screen in the
DiagnosticMenu.
71 The control sensor measures
the temperature to be -3°C
less than the set point for
3minutes.
1. Air flowocclusion.
2. Heaterfailure.
3. Control boardfailure.
4. Internal wire harness failure.
1. Check for hoseobstructions.
2. Check the air intake on the bottom of the unit forobstructions.
3. Check for blockedfilter.
4. Test all 3heater wattages using the System Test screen in Diagnosticmode.
72 The outlet temperature
does not increase at
expectedrate
1. Air flowocclusion.
2. Heaterfailure.
3. Control boardfailure.
4. Internal wire harness failure.
1. Check for hoseobstructions.
2. Check the air intake on the bottom of the unit forobstructions.
3. Check for blockedfilter.
4. Test all 3heater wattages using the System Test screen in Diagnosticmode.
73 Control and monitor sensors
differ by more than 3°C for
30seconds.
1. Sensor boardfailure.
2. Internal wire harnessfailure.
3. Control board failure.
1. Check for moisture onsensor.
2. Perform the 43C test in the System Check option of the Diagnostic
Menu. Verify the end of hose temperature is 43°C ± 3°C using the Model
22110temperature test unit and calibrated thermocouplemeter.
Technical Support and OrderPlacement
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.
USA:
• Call 3MTechnical Support at800-733-7775
Outside of theUSA:
• Contact your local 3Mrepresentative
In-Warranty Repair andExchange
USA
• Call 3Mtechnical support at 800-733-7775if your warming unit requires
factoryservice.
• Provide the serial number located on the back of the warmingunit.
• Technical Support will give you a Return Authorization (RA) number. Use this RA
number on all correspondence. Your Technical Support representative will also
send a shipping carton to you at no charge, ifneeded.
Outside of theUSA
• Contact your local distributor concerning in-warranty repair and exchange.
Provide the serial number located on the back of the BairHugger warming unit
when youcall.

12 3M Bair Hugger Model 675 Warming Unit – Service Manual
Acronym Definitions
EMI ElectromagneticInterference
EMC ElectromagneticCompatibility
ESD ElectrostaticDischarge
IV Intravenous
LED Light-emittingDiode
LCD Liquid CrystalDisplay
RF RadioFrequency
PCS Proximal ControlSensor
PMS Proximal MonitorSensor
RPM Revolutions PerMinute
Physical Characteristics
Dimensions 14.5" high x 10.5" deep x 11"wide
(36.2cm high x 26.7cm deep x 28cmwide)
Weight 9.93lb (4.5kg)
Relative noise level 50dBA
Hose Flexible
Length: 80" (203cm)
Weight: 1.51lb (0.686kg)
Diameter: 2" (5.08cm)
Unit Intake Filter MERV14*
Recommended Filter Change Every 12months or 500hours ofuse.
*See “Frequently Asked Questions on Filtration”section
Recommended operating environment
Temperature 15°C-25°C(59°-77°F)
Humidity Up to 80% relative humidity(non-condensing)
Altitude Max 2,000m
Operating temperatures
Temperature control Electronicallycontrolled
Heat generated 2217BTU/hr (average), 650W(average)
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 56°C (53°C ±
3°Ctypical).
Alarm system Over-temperature (≤56°C, 53°C ± 3°C typical): red Over-Temp
indicator symbol will flash alternately with the “Wrench”
symbol, alarm sounds, heater and blower shut down, operating
indicator lights turn OFF, and control panel becomes
unresponsive. Remove fromservice.
Under-temperature (<3°C of selected temperature/setting
for 3minutes): blue Under-Temp indicator symbol will flash
alternately with the “Wrench” symbol, alarm sounds, heater
and blower shut down, operating indicator lights turn OFF, and
control panel becomes unresponsive. Remove fromservice.
Fault “Wrench” symbol displays and alarm sounds. Heater and blower
shut down, operating indicator light turns OFF and control
panel becomes unresponsive. Servicerequired.
Overcurrent
protection
Dual input fused lines. Fuses are to be accessed and/or
replaced only by servicepersonnel.
Alarm/Fault Codes
Alarm conditions Generalfault
Over-temperature
Under-temperature
Fault code indicator Yes on LCDscreen
Filter change indicator Yes: Triggered by 500hours ofuse
Electrical Characteristics
Heating element 1190WResistive
Heater control 3stageheater
flickerfree
Temperature settings Ambient
32° C (89.6°F)
38° C (100.4°F)
43° C (109.4°F)
Temperature accuracy +/- 3°C
Temperature display
resolution 0.1°C
Leakage current Meets UL 60601-1and IEC 60601-1requirements
Blower motor Non-adjustable, onespeed
Airflow: up to 44cfm or 20.77L/s
Operating speed: 4,700RPM
Power consumption Peak: 1255W
Average: 650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, 6A,or
100VAC, 50/60Hz, 12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

English / 34-8720-2487-1 13
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; IEC 60529Classification (IP)IPX1
Classification
Guidance and manufacturer’s declaration – electromagnetic emissions
The model 675is intended for use in the electromagnetic environment specified below. The customer or the user of the model 675should assure that it is used in such
anenvironment.
Emissions test Compliance Electromagnetic environment -guidance
RF emissions, CISPR 11 Group 1 The model 675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 675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 675is intended for use in the electromagnetic environment specified below. The customer or the user of the model 675should assure that it is used in such
anenvironment.
These guidelines may not apply in all situations. Electromagnetic propagation is affected by absorption and reflection from structures, objects andpeople.
IEC60601
test level, Compliance level Electromagnetic environment -guidance
Electrostatic discharge (ESD), IEC61000-4-2
±8kVcontact Floors should be wood, concrete or ceramic tile. If floors are covered with synthetic material, the relative humidity should be at
least30%.
±15kV air
Electrical fast transient/burst, IEC61000-4-4
±2kV for power supplylines Mains power quality should be that of a typical commercial or hospitalenvironment.
±1kV for input/output lines
Surge, IEC61000-4-5
±1kV line toline Mains power quality should be that of a typical commercial or hospitalenvironment.
±2kV line(s) to earth
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 Mains power quality should be that of a typical commercial or hospital environment. If the user of the model 675requires
continued operation during power mains interruptions, it is recommended that the model 675be powered from an
uninterruptible power supply or abattery.
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
UT is the a.c. mains voltage prior to
application of the test level.
Power frequency (50/60Hz) magnetic field, IEC61000-4-8
30A/m Power frequency magnetic fields should be at levels characteristic of a typical location in a typical commercial or
hospitalenvironment.
IEC60601
test level Electromagnetic environment -guidance
Conducted RF, IEC 61000-4-6, and Radiated RF, IEC61000-4-3
6Vrms, 150kHz to 80MHz
10V/m, 80MHz to 2,5GHz
Portable and mobile RF communications equipment should be used no closer to any part of the model 675, 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).
At 80MHz and 800MHz, the higher frequency rangeapplies.
Field strengths from fixed RF transmitters, as determined by an electromagnetic site survey,a 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:
Notes
a Field 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 675is used exceeds the applicable RF compliance level above, the model
675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675.
b Over the frequency range 150kHz to 80MHz, field strengths should be less than 3V/m.

14 3M Bair Hugger Model 675 Warming Unit – Service Manual
Recommended separation distances between portable and mobile RF communications equipment and the model 675
The model 675is intended for use in an electromagnetic environment in which radiated RF disturbances are controlled. The customer or the user of the model 675can help
prevent electromagnetic interference by maintaining a minimum distance between portable and mobile RF communications equipment (transmitters) and the model 675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 d in meters (m) can be estimated using the equation applicable to
the frequency of the transmitter, where P is the maximum output power rating of the transmitter in watts (W) according to the transmittermanufacturer.
Notes
At 80MHz and 800MHz, the separation distance for the higher frequency rangeapplies.
These guidelines may not apply in all situations. Electromagnetic propagation is affected by absorption and reflection from structures, objects andpeople.
MEDICAL — GENERAL MEDICAL EQUIPMENT AS TO ELECTRICAL
SHOCK, FIRE AND MECHANICAL HAZARDS ONLY IN
ACCORDANCE WITH ANSI/AAMI ES60601-1(2005) + AMD 1(2012)
and IEC 80601-2-35; CAN/CSA-C22.2No. 60601-1(2014) and CAN/
CSA-C22.2No. 80601-2-35; ControlNo.4HZ8
Classified under IEC 60601-1Guidelines (and other national versions of the
Guidelines) as: Class Iequipment; Type BF applied part (warming blanket/gown is the
appliedpart); Protection against harmful ingress of water:IPX1; Continuousoperation;
Not suitable for use in the presence of flammable anesthetic mixtures with air or with
oxygen or nitrousoxide.
Frequently Asked Questions (FAQ) onFiltration
What filter is used in the 3M™ BairHugger™ Model675warmingunit?
The Model675uses the same filter media as has for many years been used in prior BairHugger 700-series models. That filter media is classified on an industry-standard scale
as MERV 14at 44CFM (cubic feet per minute) under ASHRAE Standard 52.2-2012: Method of Testing General Air Ventilation Air-Cleaning Devices for Removal Efficiency by
ParticleSize.1,2
What is a MERVrating?
The Minimum Efficiency Reporting Value, or MERV, is a measurement scale to rate the efficiency of an air filter as a function of particle size based on the ASHRAE
Standard52.2-2012.1,2
What is the MERV rating recommended for operatingrooms?
ASHRAE Standard 170-2013, Ventilation of Health Care Facilities, provides standards and guidance on the design requirements for ventilation systems utilized in health care
facilities.3The standard recommends that operating rooms utilize a filter that is equivalent to MERV 14.3This MERV rating is specific to the ventilation system in the hospital’s
operatingroom.
What is the MERV rating recommended for patient warming devices in the operatingroom?
There is no filtration standard for patient warming devices utilized within the operating room. The ASHRAE Standard is a standard used to assess filter efficiency in health care
ventilationsystems.
Is a HEPA filternecessary?
No. We are not aware of any evidence or claim demonstrating that a HEPA filter improves patientsafety.
What is the ASHRAE 52.2-2012standard?
The American Society of Heating, Refrigerating and Air-Conditioning Engineers (ASHRAE) is a global organization focused on research, education and standards for heating,
ventilation, air conditioning and refrigeration. The ASHRAE standard 52.2-20121,2provides test methods for air intake filters to ensure standardization in classification and
efficiency. For more information on ASHRAE, please visit www.ashrae.org.
References:
1. ANSI/ASHRAE Standard 52.2-2012: Method of Testing General Air Ventilation Air-Cleaning Devices for Removal Efficiency by Particle Size. The American Society of Heating,
Refrigerating and Air-Conditioning Engineers, Inc. © 2012ASHRAE. ISSN 1041-2336. Available at http://www.ashrae.org. Accessed on6/7/2016.
2. ANSI/ASHRAE Addenda a, b, and d to ANSI/ASHRAE Standard 52.2-2012. Method of Testing General Air Ventilation Air-Cleaning Devices for Removal Efficiency by Particle
Size. The American Society of Heating, Refrigerating and Air-Conditioning Engineers, Inc. © 2015ASHRAE. ISSN 1041-2336. Available at http://www.ashrae.org. Accessed
on6/7/2016.
3. ANSI/ASHRAE/ASHE Standard 170-2013: Ventilation of Health Care Facilities. The American Society of Heating, Refrigerating and Air-Conditioning Engineers, Inc. ASHRAE.
ISSN 1041-2336. Available at http://www.ashrae.org. Accessed on6/7/2016.
MaintenanceChecklist
□ Filterinspection
1. Remove and inspect thefilter.
2. Return filter or replace asnecessary.
Note: Replace every 12months or 500hours ofuse.
□ Test the alarmfunction
□ Calibrate the operatingtemperature
□ Test the over temperature detectionsystem

English / 34-8720-2487-1 15
MaintenanceLog
Date Maintenance ActionPerformed Hour Meter