Bair Hugger 500/OR Service Manual
15
6.
Locate the over heat adjustment thermostat (see Figure 7).
NOTE: Adjustment of the over heat alarm thermostat is most
easily done while the temperature read-out is climbing.
Over heat alarm
thermostat
(detail)
Figure 7. Location of Over
Heat Alarm Thermostat
7.
Use a small slotted screwdriver to adjust the thermostat.
• If the tested alarm temperature was below the specified
limits, turn the screwdriver CLOCKWISE to increase
the alarm temperature.
• If the tested alarm temperature was above specified
limits, turn the screwdriver COUNTERCLOCKWISE
to lower the alarm temperature.
8.
Fine-tune the adjustment until the warming unit alarms
at the specified temperature.
9.
When the over heat alarm activates both visually and
audibly, note the maximum temperature achieved. Let the
alarm operate for at least 1 minute, or until the
temperature read-out is approximately 38°C (100°F),
then, turn the warming unit OFF and then ON; the
alarm should also turn off. The alarm and manual reset
constitutes one cycle.
10. Retest the alarm temperature to verify correct adjustment
at least 2 times. Allow the warming unit to cycle before
each test.
11. When the warming unit alarm setting is within the
specified limit, turn the warming unit OFF, and
disconnect it from the power source.
12. Remove the hose end from the port on the temperature
test device.
13. Remove the jumper from between the test points, and
close the rear access panel. Resecure the screws.
14. Record the maintenance action taken and the hours of
operation (read from the hour meter) in the Maintenance
Log (Appendix).
