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Figure 7: System Control Panel
THERMOSTAT
(Figure 9)
A cross ambient thermostat is used on all standard chas-
sis units. In addition to cycling the unit in a heating or
cooling operation, the thermostat will terminate the cool-
ing cycle in the event ice forms on the evaporator coil, in
this case the thermostat functions as a de-ice control.
A resistor (anticipator) is positioned within a plastic block
to supply a small amount of heat to the bulb area to
prevent long “off cycles” in the “Cool-Fan Auto” (Money-
Saver) position (see Figure 10.) A current feedback
through the fan motor windings during “off cycle” com-
pletes the circuit to the resistor.
RANGE: Cooling Model Thermostat
(Part No. 618-225-00)
60°F (± 2°) to 92°F (± 4°),
TEST:
Remove wires from thermostat. Turn the thermostat to
its coldest position. Check to see if there is continuity
between the two terminals. Turn the thermostat to its
warmest position. Check continuity to see if thermostat
contacts open. NOTE: Temperature must be within range
listed to check thermostat. Refer to the troubleshooting
section in this manual for additional information on ther-
mostat testing.
Figure 9: Thermostat
THERMOSTAT ADJUSTMENT
No attempt should be made to adjust thermostat. Due
to the sensitivity of the internal mechanism and the so-
phisticated equipment required to check the calibration,
it is suggested that the thermostat be replaced rather
than calibrated.
Figure 8: System Control Switch