Service manual
Bair Hugger Model 750 Temperature Management Unit Service Manual
10
Check the 3M
TM
Bair Hugger
TM
therapy website to ensure you have the most recent version of this document. www.bairhugger.com reorder #202522A
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 Description
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 hose end sensor calibration. is should
be done as part of routine maintenance and always aer servicing the temperature management unit or
replacing the hose. e hose end sensor temperature can be altered a maximum of ±3.0°C by adjusting the
calibration oset value. In the Calibration mode, the temperature management unit operates in the Ambient
temperature mode, and the alphanumeric display shows the current hose end sensor temperature and
calibration oset 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 page17 for more information about a particular fault code.
e System Information mode allows the technician to view important system information including the
rmware, system identication, 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 soware. e Rev version appears in the display window upon
connection to a power source.