Cooling Sequence of Operation
Power:
1 -
to the unit cooling, heating and blower controls.
2 - Line voltage provides voltage to compressor crankcase heater relay K191-1 N.C. contacts, compressor contactor
K1, blower motor B3, and outdoor fan motor B4 (on G volt units line voltage is supplied to two fuses F27, transformer
T4, blower motor B3, and outdoor fan motor B4).
Blower Operation:
3 -
motor B3 by sending a PWM signal. The blower motor modulates between High Cool CFM and Low Cool CFM
Cooling
4 -
Note - The A55 will start to reduce the three- through ve-ton compressor speed at a heat sink temperature of 125°F.
Typical competitor equipment reduces compressor speed at 115°F.
6 -
7 -
HR1 crankcase heater.
Power Exhaust Fan Operation
8 -
9 -
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