Testing The Over-Temperature Detection System; Viewing The Fault Code Log; General Maintenance And Storage; Cleaning Instructions - 3M Bair Hugger 675 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.
10
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
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.
Fault Condition
3M™ Bair Hugger Model 675 Warming Unit – Service Manual