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 TM 10-4110-262-13&P
0003 00
Upper
Housing
Evaporator Coil
Evaporator
Expansion Valve
Fans
Drain Pan Tube
Drain Pan
Condensate
Drain Tube
Evaporator Section Components
Unit Operation
Unit operation is controlled by the unit controller, which includes the on/off switch, manual defrost switch,
thermometer, thermostat, thermostat adjustment and the indicator light. The operating modes are cool,
null, heat, and defrost. The unit automatically shifts from cool, null, and heat to maintain the setpoint
temperature.
The thermostat controls the operation of the RU by energizing and de-energizing the heater contactor
(CMC Heat). The compressor operation is controlled by the thermostat, and energizing the compressor
contactor during cooling operations.
When the power relay is energized, it energizes the evaporator and condenser fans as well as the
compressor motor.
0003 00-5
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