Bair Hugger 750 User manual

Warning: Electrical Shock Hazard. There are electrically live parts within the temperature management unit when it is connected to a power
source, even when the unit is in Standby mode.
For information on operating the Model 750 temperature management unit, please refer to the Model 750 Operator’s Manual.
Please forward to Biomedical Engineering Department
Bair Hugger*
Model 750 Warming Unit
Service Manual
Total Temperature Management System
Bair Hugger Modell 750 Temperaturmanagementgerät Service Gebrauchsanleitung
Warnung: Gefährliche elektrische Spannung. In einem an das Netz angeschlossenen Temperaturmanagement-Gerät stehen bestimmte elektrische
Komponenten auch dann unter Strom, wenn sich das Gerät im Betriebsmodus Standby befindet.
Informationen zum Betrieb des Temperaturmanagement-Gerätes Modell 750 finden Sie im Betriebshandbuch für das Modell 750.
Bitte an die Abteilung für biomedizinische Technik weiterleiten.
Unité de gestion de température Bair Hugger modèle 750 Service Manuel
Avertissement : risque de secousses électriques. L’appareil de gestion de la température contient des pièces qui sont sous tension lorsqu’il est
raccordé à une source d’alimentation et cela même si l’appareil est en mode d’attente.
Pour de plus amples informations sur le fonctionnement de l’appareil de gestion de la température, modèle 750,
consulter le manuel de l’utilisateur du modèle 750.
A transmettre au Service d’ingénierie biomédicale
Check the Bair Hugger therapy website to ensure you have the most recent version of this document. www.bairhugger.com reorder #200595F

Bair Hugger*
Model 750 Warming Unit
Service Manual
English 1
Deutsch 27
Français 55

Table of Contents
Introduction ��������������������������������������������������������������������� 1
Description of the Total Temperature Management System ........................ 1
Indications .................................................................... 1
Contraindications ............................................................. 1
Warnings ..................................................................... 1
Cautions ...................................................................... 2
Notices ....................................................................... 3
Proper Use and Maintenance ................................................... 3
Read Before Servicing Equipment ............................................... 3
Safety Inspection .............................................................. 3
Overview ������������������������������������������������������������������������ 4
Unit Power-On-Reset .......................................................... 4
Operating Modes .............................................................. 5
Standby Mode ................................................................. 5
Fault Conditions............................................................... 6
Over-Temperature Condition ................................................... 6
Alternative Modes ............................................................. 7
Accessing the Alternative Modes ................................................ 8
Exiting an Alternative Mode .................................................... 8
Service Procedures ��������������������������������������������������������������� 9
Calibrating the Operating Temperatures ......................................... 9
Testing the Over-Temperature Detection System ................................. 11
Viewing the Fault Code Log ................................................... 13
Clearing the Fault Code Log ................................................... 13
Fault Code Table.............................................................. 14
Viewing the Hour Meter ...................................................... 15
Viewing the Operating Timer .................................................. 15
Replacing the Air Filter........................................................ 16
Replacing the Hose............................................................ 17
Cleaning the Warming Unit ................................................... 19
Technical Support and Customer Service ���������������������������������������� 20
When You Call for Technical Support........................................... 20
In-Warranty Repair and Exchange.............................................. 20
Returning Units for Service .................................................... 21
Specications�������������������������������������������������������������������� 22
Maintenance Log ���������������������������������������������������������������� 24
Denition of Symbols ����������������������������������������������������������� 25

1
Bair Hugger Model 750 Temperature Management Unit Service Manual
Introduction
Description of the Total Temperature Management System
e Bair Hugger brand Total Temperature Management system consists of a Model 750 forced-
air temperature management unit (with available rolling stand and sheet clip) and disposable
components, including Bair Hugger forced-air blankets, Bair Paws* patient warming gowns, and
the 241* blood/uid warming set. You can use the Model 750 temperature management unit in
all clinical settings including the operating room to provide patient temperature management.
is manual includes operating instructions and unit specications for the Model 750
temperature management unit. For information about using Bair Hugger blankets, Bair Paws
gowns, or the 241 blood/uid warming set with the Model 750 temperature management unit,
refer to the “Instructions for Use” included with each of these disposable components.
Indications
e 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 become too warm or too cold. e temperature
management system can be used with adult and pediatric patients.
Contraindications
Do not apply heat to lower extremities during aortic cross-clamping. ermal injury may occur
if heat is applied to ischemic limbs.
Warnings
Do not leave patients with poor perfusion unmonitored during prolonged warming therapy1.
sessions. ermal injury may result.
e Bair Hugger temperature management unit has been designed to operate safely ONLY2.
with Arizant Healthcare* disposable components. 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 unit being used in
conjunction with non-Arizant Healthcare products.)
3. Do not warm patients with the temperature management unit hose alone. ermal
injury may result. Always connect the hose to a Bair Hugger blanket or Bair Paws
gown before providing therapy.
Do not place the non-perforated side of the blanket on the patient. ermal injury may4.
result. Always place the perforated side (that is, with small holes) towards the patient.
Do not continue temperature management therapy if the over-temp indicator light5.
illuminates and the alarm sounds. ermal injury may result. Unplug the unit, and contact
a qualied service technician.

Bair Hugger Model 750 Temperature Management Unit Service Manual
2
Do not continue 241 blood/uid warming therapy if the over-temp indicator light6.
illuminates and the alarm sounds. Immediately stop uid ow, and discard the blood/uid
warming set. Unplug the temperature management unit, and contact a qualied service
technician.
Do not use a forced-air warming device over transdermal medication. Increased drug7.
delivery and patient injury or death may occur.
Do not allow the patient to lie on the warming unit hose or allow the hose to directly8.
contact the patient’s skin during patient warming; thermal injury may result.
Equipment not suitable for use in the presence of a ammable anesthetic mixture with air9.
or with oxygen or nitrous oxide.
Resuable blankets made from woven fabric, or blankets without discrete, visible holes, can10.
cause the safety system of this unit to fail, which may result in serious thermal injury. is
warming unit has been designed to operate safety ONLY with Bair Hugger® blankets or
Bair Paws gowns.
Cautions
Except for specic blanket models, Bair Hugger blankets are not sterile and are all intended1.
for single patient use ONLY. Placing a sheet between the Bair Hugger blanket and the
patient does not prevent contamination of this product.
Monitor the temperature and cutaneous response of patients who are incapable of2.
reacting, communication and/or who are without a sense of feeling every 10-20 minutes
or according to institutional protocol. Monitor the patient's vital signs regularly. Adjust
air temperature or discontinue therapy when the therapeutic goal is reached or if vital sign
instability occurs. Notify physician of vital sign instability immediately.
Do not leave pediatric patients unattended during therapy.3.
Do not initiate temperature management therapy unless the temperature management unit4.
is safely placed on a hard surface or securely mounted. Otherwise, injury may result.
To prevent tipping, clamp the Model 775 temperature management unit to an IV pole at5.
a height that provides stability. We recommend clamping the unit no higher than 44 in.
(112 cm) from the oor on an IV pole with a minimum 28 in. (71 cm) diameter wheelbase.
Failure to do so may result in IV pole tipping, catheter site trauma, patient injury.
Electrical shock hazard. Do not disassemble the temperature management unit unless you6.
are a qualied service technician. ere are electrically live parts with in the unit when it is
connected to a power source, even when the unit is in Standby mode.

3
Bair Hugger Model 750 Temperature Management Unit Service Manual
Notices
e Bair Hugger temperature management unit meets medical electronic interference1.
requirements. If radio frequency interference with other equipment should occur, connect
the unit to a dierent power source.
Federal law (USA) restricts this device to sale by or on the order of a licensed healthcare2.
professional.
To reliably ground this Bair Hugger warming unit, only connect to receptacles marked3.
“Hospital Only” or “Hospital Grade”.
Proper Use and Maintenance
Arizant Healthcare Inc. assumes no responsibility for the reliability, performance, or safety of the
temperature management unit if the following events occur:
Modications or repairs are performed by unqualied personnel.•
e unit is used in a manner other than that described in the Operator’s or Service•
Manuals.
e unit is installed in an environment that does not meet the appropriate electrical and•
grounding requirements.
Read Before Servicing Equipment
All repair, calibration, and servicing of the temperature management unit require the skill of a
qualied, 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 750 Service
Manual provides the technical information needed to service the unit, or Arizant Healthcare
Inc. will provide that information on request. Perform all repairs and maintenance in accordance
with the instructions in the Service Manual.
Safety Inspection
Perform a safety inspection aer making repairs to the Bair Hugger temperature management
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.

Bair Hugger Model 750 Temperature Management Unit Service Manual
4
Overview
When you connect the Model 750 temperature management unit to a grounded power source,
the unit automatically performs the power-on-reset operation described below. Following the
power-on-reset operation, the unit will enter the Standby mode. You can select any operating
mode by pressing the appropriate button on the unit’s control panel. See Figure 1.
Unit Power-On-Reset
e Model 750 temperature management unit performs the following power-on-reset sequence
aer you connect the unit to a grounded power source:
Performs all self-test functions.•
Illuminates all indicator lights and all pixels in the alphanumeric display momentarily.•
Displays the text “BH 750” and the soware revision level in the alphanumeric display.•
Produces 3 chirping sounds.•
Enters the Standby mode.•
If the temperature management unit loses power for less than 1 second, the unit’s soware will
remain in the operating mode you selected prior to the power loss. If the unit loses power for
longer than 1 second, the unit’s soware will reset when you restore power. e unit will then
enter the Standby mode.
Figure 1. Control panel
Alternative Mode
button

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Bair Hugger Model 750 Temperature Management Unit Service Manual
Operating Modes
e Model 750 temperature management unit has 4 operating modes: Ambient, Low, Medium, High.
To select the Low, Medium, High, or Ambient mode, press the corresponding button. e
temperature management unit will operate within the specied temperature range, shown in the
table below.
Temperature Mode Temperature of Delivered Air
Low 32˚C ± 1.5˚C
Medium 38˚C ± 1.5˚C
High 43˚C ± 1.5˚C
Ambient Unit will supply air that is slightly warmer than room-temperature
Aer you select a temperature mode, the following events occur:
Corresponding indicator light illuminates.•
Blower operates.•
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.
Standby Mode
To place the unit in Standby mode, press the Standby button. When in Standby mode, the
following events occur:
Standby• indicator light illuminates.
Blower and heater turn o.•
Alphanumeric display deactivates.•
Temperature mode timer pauses.•
Alarm and fault detection functions remain active.•
* Within ±3˚C in units with < Rev L Soware. e Rev version appears in the display window
upon connection to a power source.

Bair Hugger Model 750 Temperature Management Unit Service Manual
6
Fault Conditions
e Model 750 temperature management unit’s soware recognizes several nonhazardous fault
conditions including:
Sensor failures•
Heater failures•
Computer failure•
Soware 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 ashes.•
Audible alarm sounds.•
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 temporarily silence it. e
temperature management unit must be unplugged before it can be restarted. See Viewing the
Fault Code Log on page 13 and the Fault Code Table on page 14 for more information about
specic fault codes.
Over-Temperature Condition
When an overtemperature condition exists, the following events occur:
Over-temp indicator light ashes.•
Audible alarm sounds.•
Blower and heater turn o.•
Fault code appears in the alphanumeric display (see page 14).•
When the audible alarm sounds, press any button on the keypad to temporarily silence it. e
temperature management unit must be unplugged before it can be restarted.
* Up to 3 fault codes in units with < Rev L soware. e Rev version appears in the display
window upon connection to a power source.

7
Bair Hugger Model 750 Temperature Management Unit Service Manual
Alternative Modes
e Model 750 temperature management unit has 5 alternative modes that allow access to the
service and calibration utilities of the unit.
Alternative Modes
AltMode0 Hour meter
AltMode1 Calibration
AltMode2 Fault code log
AltMode3 System information
AltMode4 Over-temperature detection test
e Hour Meter mode displays the cumulative amount of operating time (in Ambient, Low,
Medium, and High modes) the temperature management unit has accrued since the initialization
of EEPROM. e time is displayed in whole hours only.
e Calibration mode allows a technician to check and adjust the nozzle temperature. is
should be done as part of routine maintenance and always aer servicing the temperature
management unit or replacing the hose. e nozzle temperature can be altered a maximum
of ±3.0˚C by adjusting the calibration oset value. In the Calibration mode, the temperature
management unit operates in the Ambient temperature mode, and the alphanumeric display
shows the current nozzle temperature and calibration oset with 0.1˚C precision.
e Fault Code Log mode sequentially displays the last 5* fault codes stored in system memory.
Please refer to the Fault Code Table on page 14 for more information about a particular fault code.
e System Information mode allows the technician to view important system information
including the rmware, system identication, serial port baud rate, 5V power supply status, and
the control board serial number.
e Over-temperature Detection Test mode allows the user to test the operation of the
independent over-temperature shutdown system.
* e last 3 fault codes in units with < Rev L soware. e Rev version appears in the display
window upon connection to a power source.