Bair Hugger 500/OR Service Manual
14
Over Heat Alarm Thermostat Adjustment
WARNING: Improper adjustment of the warming unit’s over heat
alarm setpoint could result in patient exposure to temperatures
outside the indicated range, and may lead to patient injury.
• Closely follow instructions for thermostat adjustment.
• Dangerous voltages are present at the terminals of the
thermostat.
• Always use a Model 221 Temperature Test Kit or a Model 22110
Temperature Test Unit to verify output temperatures.
• Recalibrate the temperature test kit at least once a year. The
Model 22110 Temperature Test Unit does not need to be
calibrated. The meter it is connected to must be calibrated.
Follow the calibration instructions in the meter service manual or
follow standard facility calibration schedules.
• When in doubt, contact Technical Service for assistance in
temperature adjustment.
Tools/Equipment
• Model 221 Temperature Test Kit or Model 22110
Temperature Test Unit
• Small slotted screwdriver
• Phillips-head screwdriver
• Short jumper wire with alligator clips
If using a Model 22110 Temperature Test Unit:
• Use a calibrated temperature meter that can accept a male
subminiature connector and read a K style thermocouple
(e.g., a Fluke Model 52 K/J Thermometer).
• If the connector does not fit your meter, you can remove the
provided connector and attach a connector that fits your
meter.
Method
1.
Disconnect the warming unit from the power source.
2.
Loosen the 2 Phillips-head 1/4-turn screws on the rear
access panel. Lift the access panel to remove it.
3.
Two (2) test point leads (TP3 & TP4) protrude in the
exposed area of the board (see Figure 5); place a jumper
wire between the test points.
4.
Insert the open hose end from the warming unit in the
port on the temperature test device.
NOTE: Do not block the rear air vents on the test device.
5.
Reconnect the warming unit to the power source. Turn
the power ON.
NOTE: The temperature setting will not affect the over heat
test because the control circuit has been bypassed by the
jumper wire.
