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HS29−2 & −3 SINGLE-PHASE OPERATING SEQUENCE
(
RECIPROCATING OR ROTARY COMPRESSOR)
NOTE− The thermostat used may be electromechanical or electronic.
NOTE− Transformer in indoor unit supplies power (24 VAC) to the thermostat and outdoor unit controls.
COOLING:
2Cooling demand initiates at Y1 in the thermostat.
324VAC from indoor unit energizes compressor contactor K1.
4K1-1 N.O. closes, energizing terminal C" of compressor (B1) and outdoor fan motor (B4).
5Outdoor fan motor (B4) begins immediate operation.
6Compressor (B1) begins start-up. Hard start contactor K31 remains closed during start-up and start capacitor C7 remains in
the circuit. As the compressor gains speed, K31 is energized. When K31 is energized, the contacts open and start capaci-
tor C7 is taken out of the circuit.
END OF COOLING DEMAND:
7Cooling demand is satisfied. Terminal Y1 is de-energized.
8Compressor contactor K1 is de-energized.
9K1-1 opens and compressor (B1) and outdoor fan motor (B4) are de-energized and stop immediately.
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