3M Bair Hugger 675 - Testing and Maintenance Procedures; Testing Over-Temperature Detection System; Viewing the Fault Code Log; General Maintenance and Storage

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.