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HS29 THREE-PHASE OPERATING SEQUENCE
(ALL COMPRESSORS)
a−HS29 Y", G", and J" Voltage Operation Sequence
This is the sequence of operation for HS29 Y" voltage units. The HS29 G"voltage sequence is the same; however the
J" voltage units have an outdoor fan transformer. The sequence is outlined by numbered steps which correspond to
circled numbers on the adjacent diagram.
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 energizes compressor contactor K1.
4K1-1 N.O. closes energizing compressor (B1) and outdoor fan motor (B4).
5Compressor (B1) and outdoor fan motor (B4) begin immediate operation.
END OF COOLING DEMAND:
6Cooling demand is satisfied. Terminal Y1 is de-energized.
7Compressor contactor K1 is de-energized.
8K1-1 opens and compressor (B1) and outdoor fan motor (B4) are de-energized and stop immediately.
5
6
7
1
2
3
4
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