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Sequence of Operation
Power:
terminal strip TB1. TB1 provides 24VAC to the unit
Blower Operation:
Economizer Operation:
The economizer control module receives a demand
1st Stage Cooling (compressor B1)
by the thermostat. G energizes blower. 24VAC is
optional N.C. high pressure switch S4. Compressor
2nd Stage Cooling (compressor B2)
24VAC is routed through TB1 and proves N.C.
switch S7. Compressor contactor K2 is energized.
N.O. K2 contacts close energizing compressor B2.
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