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FIGURE 28
1
2
3
4
5
C−SINGLE-PHASE STARTING SEQUENCE
1− Line voltage feeds through L1 and L2 to energize outdoor transformer
T19 and outdoor unit. Crankcase heater is energized through relay K1
auxiliary contacts.
2− Transformer T19 provides 24VAC to TSC and contactors K1 and K69.
3− The indoor transformer supplies 24VAC to the indoor unit and the in-
door thermostat. Indoor transformer also provides 24VAC power to
defrost control CMC1, reversing valve L1, speed control thermostat
S55, service light thermostat S54 and ambient thermistor RT3 in out-
door unit.
4− On power-up, 24VAC is fed through JP44-1 and JP44-7 to the TSC.
The TSC begins a 10 second power-up delay.
5− The TSC begins a 5 minute delay during which the outdoor unit is not
operational. After the 5 minute delay, the TSC waits in OFF" mode for
1st stage or 2nd stage demand.
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