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

5
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.

Bair Hugger Model 750 Temperature Management Unit Service Manual
8
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 temperature management unit but is unlabeled. Press the “Bair Hugger”
text on the bear logo when the instructions direct you to press the 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. e chart on the following page
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 from the list above.
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.
Figure 2. Control panel
Alternative
Mode
button

9
Bair Hugger Model 750 Temperature Management Unit Service Manual
Service Procedures
c a u t i o n
Do not use automatic testers for service procedures; always test the temperature management
unit manually. Failure to do so may cause Fault Code 053.
Calibrating the Operating Temperatures
c a u t i o n
Perform all temperature testing of the temperature management unit with an Arizant Healthcare
Model 22110 Temperature Test Unit.
Arizant Healthcare Inc. assumes no responsibility for the reliability, safety, or performance
of the Total Temperature Management system if temperature tests or adjustments are made
in any manner other than those described here. Improper measurement or adjustment of the
temperature management 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
NOTES:
e Model 22110 Temperature Test Unit simulates the operating characteristics of•
Bair Hugger blankets when used with Bair Hugger temperature management units.
When using the Model 22110 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 ermometer). If the test unit’s connector does
not t your thermometer, remove the connector from the test unit and attach a connector
that ts your meter. Be certain to observe polarity.

Bair Hugger Model 750 Temperature Management Unit Service Manual
10
Method
N: If the temperature management unit has been stored at a temperature lower than 20˚C,
allow it to reach ambient temperature before beginning the calibration procedure.
Attach the Model 22110 temperature test device to the end of the temperature management4.
unit hose.
Connect the temperature management unit to a grounded power source. e unit performs5.
a self-test and automatically proceeds to Standby mode.
Press the6. Ambient button to place the unit in Ambient mode. Allow the unit to run in
Ambient mode for at least ten minutes to equalize the temperature of the unit’s internal
components.
Press the7. Alternative Mode button (see Figure 2 on page 8) and the Ambient button
simultaneously for 3 seconds. e temperature management unit is now in Calibration
mode. In this mode, the temperature management unit performs the following tasks:
Low• and Med indicator lights ash.
Blower activates.•
Heater elements deactivate.•
e text “TMP” and the temperature in ˚C (0.1˚C resolution) at the end of the hose•
appear in the alphanumeric display.
e text “OS” and the current calibration oset value (0.1˚C resolution) appear in the•
alphanumeric display.
Compare the temperature shown on the alphanumeric display and the temperature on the8.
independent, temperature calibration device.
If the temperatures match, press the• Alternative Mode button to return the temperature
management unit to Standby mode.
If the temperatures do not match, adjust the temperature management unit’s displayed•
temperature:
Press thea. Low button to decrease the temperature or the Med button to increase
the temperature by 0.1˚C. You can adjust the temperature of the temperature
management unit a maximum of ±3˚C.
Continue to press theb. Low or Med button(s) until the temperature in the
alphanumeric display matches the temperature on the calibration device.
Press thec. Alternative Mode button to store the calibration oset value and return the
temperature management unit to Standby mode.
N: If it is necessary to enter an oset value greater than ±3˚C, theremay be a defect in the set
point sensor. Remove unit from service until a new hose assembly can be substituted.

11
Bair Hugger Model 750 Temperature Management Unit Service Manual
Testing the Over-Temperature Detection System
w a r n i n g
Do not perform the over-temperature detection system test while the temperature management
unit is being used for temperature management therapy. ermal injury may result.
c a u t i o n
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
Method
: If the temperature management unit has been stored at a temperature lower than 20˚C,
allow it to reach ambient temperature before beginning the test.
Connect the temperature management unit to a grounded power source. e unit performs1.
a self-test and automatically proceeds to Standby mode
Connect the temperature test kit to the hose of the temperature management unit.2.
Press the3. Ambient button and allow the temperature management unit to run for 5
minutes.
Press the4. Alternative Mode button (See Figure 2 on page 8) and the High button
simultaneously for 3 seconds. e temperature management unit is now in a Forced Over-
temperature mode. In this mode, the temperature management unit performs the following
tasks:
Blower activates.•
Heater elements continuously operate at full power.•
High• indicator light ashes.
Over-temperature timer activates.•
“OT Test” ashes in the alphanumeric display.•

Bair Hugger Model 750 Temperature Management Unit Service Manual
12
Wait for the temperature management unit to perform the over-temperature test. When the5.
test is complete, the temperature management unit performs the following tasks:
Heater elements deactivate.•
Blower continues to operate. (• : e blower turns o if an over-temperature
condition occurs during normal use.)
View the alphanumeric display to determine test outcome:6.
PASS–e unit detected an over-temperature condition within 150* seconds. An alarma.
sounds for 2 short beeps. e text “PASS” ashes in the alphanumeric display, followed
by these messages:
OT Test OT Test1.
PASS-Prx OR PASS-Dst
TestTime2.
XX Secs
Unplug3.
To Reset
FAIL–Unit didb. not detect an over-temperature condition within 150* seconds (time-out
failure). An alarm sounds and the Fault indicator light ashes. e text “FAIL” ashes in
the alphanumeric display, followed by these messages:
OT Test1.
FAIL
TestTime2.
150* Secs
Unplug3.
To Reset
NOTE: Do not place a temperature management unit back into service if it fails the Over-
temperature Detection System test. Send the unit back to Arizant Healthcare for repair. See
Returning Units for Service on page 21.
Record the maximum temperature displayed by the test kit. (Use maintenance log on page7.
24.) If the temperature is outside of the 53±3˚C specication, contact Arizant Healthcare
technical service for further instructions.
Unplug the temperature management unit to reset it.8.
*Within 90 seconds in units with < Rev L soware. e Rev version appears in the display window
upon connection to a power source.

13
Bair Hugger Model 750 Temperature Management Unit Service Manual
Viewing the Fault Code Log
Service frequency
As oen as necessary.
Tools/equipment
None required.
Method
If your temperature management unit is already ON, you can access the fault code log from1.
any operating mode. Otherwise, connect the temperature management unit to a grounded
power source. e unit performs a self-test and automatically proceeds to Standby mode.
en select any operating mode.
Press the2. Alternative Mode button (see Figure 2 on page 8) and the Low button
simultaneously for 3 seconds. e temperature management unit is now in Fault Code Log
mode. In this mode, the temperature management unit performs the following tasks:
Continues to operate in current operating mode.a.
Lowb. and Med indicator light ashes.
Text “FC(n) XX” appears in the alphanumeric display. “FC” is an abbrevia-tion for thec.
phrase “fault code,” “n” represents the numerical order of the fault code in the log, and
“XX” represents the code for the fault condition. See page 14 for a list of fault codes and
their meanings.
e time of each fault appears below “FC(n) XX” in the alphanumeric display.d.
Press either the3. Low or Med button to view the next fault code in the log. e temperature
management unit stores a maximum of 5* fault codes in non volatile memory.
Press the4. Alternative Mode button to return the temperature management unit to its
previous operating mode.
Clearing the Fault Code Log
: is option is available only with soware Rev M or greater.
Put the unit in Fault Code Mode by pressing the Alternative Mode button and the Low button
simultaneously for 3 seconds; then, press the High button.
*Stores a maximum of 3 fault codes 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
14
Fault Code Table
e soware will detect and report the following conditions by displaying the corresponding
fault code:
Fault Condition_______________________________Fault Code
Internal sensor 1 over-temperature condition 01
Hose end sensor 2 over-temperature condition 02
Hose end sensor 3 over-temperature condition 03
Internal sensor 1 shorted 04
Hose end sensor 2 shorted 05
Hose end sensor 3 shorted 06
Hose end sensor 2 open 07
Low wattage heater failure 08
Medium wattage heater failure 09
High wattage heater failure 10
A/D converter timeout 11
A/D startup check failed 12
(Reserved Fault Code) 13
Error in execution loop 14
Timeout on alphanumeric display busy ag clearing 15
RAM corruption in duplicate RAM locations 16
Error in executing a depressed key 17
Stuck key during startup 50
EEPROM is at max # write cycles 51
Non-0 EEPROM byte detected aer zeroing 52
EEPROM checksum failure on copy # 1 53 (see page 9)
EEPROM compare failure copy #1 to copy #2 54
EEPROM compare failure copy #1 to RAM 55
EEPROM write cycle time out 56
SPI byte transfer time out 57
EEPROM write error when entering standby 59
Real time clock failure 60
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

15
Bair Hugger Model 750 Temperature Management Unit Service Manual
Viewing the Hour Meter
Service frequency
As oen as necessary.
Tools/equipment
None required.
Method
If your unit is already ON, you can begin the test from any operating mode. Otherwise,1.
connect the temperature management unit to a grounded power source. e unit performs
a self-test and automatically proceeds to Standby mode. en select any operating mode.
Press the2. Alternative Mode button for 3 seconds. (See Figure 2 on page 8.) e temperature
management unit is now in Hour Meter Display mode. In this mode, the temperature
management unit performs the following tasks:
Continues to operate in current operating mode.a.
“Hours” appears in the alphanumeric display.b.
Cumulative hours of temperature management unit operation appear in thec.
alphanumeric display.
Wait 60 seconds or press the3. Alternative Mode button to return the temperature
management unit to its previous operating mode.
Viewing the Operating Timer
To view the amount of time the temperature management unit has been operating in the current
temperature mode, press and hold the current temperature mode button for at least 3 seconds.
e time is displayed in HH:MM:SS format.

Bair Hugger Model 750 Temperature Management Unit Service Manual
16
Replacing the Air Filter
Service frequency
Every 6 months or 500 hours of use.
Tools/equipment
Replacement air lter•
#2 Phillips screwdriver•
w a r n i n g
Do not attempt to clean the air lter as it may contain hazardous microorganisms. Discard the
lter in a manner consistent with institutional protocol for biohazardous material.
Method
Disconnect the temperature management unit from the grounded power source.1.
Turn the temperature management unit upside down.2.
Remove the 2 screws located in the louvered lter cover.3.
Li the lter cover o the temperature management unit.4.
Remove the air lter and discard it.5.
Place the new lter in the lter compartment with the gasket toward the lter ledge.6.
Replace the lter cover with the louvers facing the back of the temperature management7.
unit.
Replace the 2 screws in the lter cover.8.

17
Bair Hugger Model 750 Temperature Management Unit Service Manual
Replacing the Hose
Service frequency
As needed.
Tools/equipment
Replacement hose•
Phillips screwdriver•
Slotted screwdriver (for grommet replacement option)•
Needle-nose pliers•
Screw grommets (included in kit)•
Method
DETACHING HOSE
Disconnect the temperature management unit from the power source before replacing1.
hose.
Unscrew the hose collar.2.
If present, use the Phillips screwdriver to remove the 2 screws that attach the hose to the3.
unit.
Slide the hose out of the temperature management unit. e hose will still be attached to4.
the unit by a cable.
Using the needle-nose pliers, carefully detach the cable connector from the header plug5.
located inside the hose connector. See Figure 3.