Service manual

Bair Hugger Model 775 Temperature Management Unit Service Manual

English 202526A

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Method

N: If the Bair Hugger Model 775 Temperature Management Unit has been stored at a temperature lower

than 20°C, allow it to reach ambient temperature before beginning the calibration procedure�

1� Attach the Model 22110 temperature test device to the end of the temperature management unit hose�

2� Connect the temperature management unit to a grounded power source� e unit performs a self-test

and automatically proceeds to Standby mode�

3� Press the 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�

Note: Verify unit is set to high fan setting by ensuring the indicator light next to the upper fan is

illuminated�

4� Press the Alternative Mode button (see "Figure 2� Location of Alternative Mode button" on

page11) 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:

• 32°C and 38°C indicator lights ash�

• Blower remains ON�

• Heater elements remain OFF�

• e text “TMP” and the end of hose temperature in °C (0�1°C resolution) appear in the

alphanumeric display�

• e text “OS” and the current calibration oset value (0�1°C resolution) appear in the

alphanumeric display�

5� Compare the temperature shown on the alphanumeric display and the temperature of the Model

22110, temperature test 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:

a� Press the 32°C button to decrease the temperature or the 38°C button to increase the

temperature by 0�1°C� You can adjust the temperature of the temperature management unit a

maximum of ±3°C�

b� Continue to press the 32°C or 38°C button(s) until the temperature in the alphanumeric display

matches the temperature on the calibration device as close as possible�

c� Press the 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, there may be a defect in the hose end

sensor� Remove unit from service until a new hose assembly can be substituted�