MCQUAY Service Guide Book Controller Configuration
29
6. Defrost Option
Select whether compressor will turn off or remain
on when 4WV changes at beginning of defrost
cycle.
Dip switch 8
a. Compressor off Off
b. Compressor on On (C2.4 spec)
7. Summary of Models available
SQCn Cooling Only model
SQHnh Heatpump model
n = number of compressors: 2, 3, 4
h = number of heaters: 0, 1, 2
Factory preset (default setting)
Model S1 S2 S3 S4 S5 S6 S7 S8
SQCn Off Off Off Off Off Off Off Off
SQHnh On On Off Off On On Off On
8. Sequential Control
Cool Mode: The starting sequence for indoor fan,
outdoor fan and compressors is shown as below:
Start Indoor
Outdoor fan 1 Compressor 1*
Outdoor fan 2 Compressor 2*
Outdoor fan 3 Compressor 3*
Outdoor fan 4 Compressor 4*
Heat Mode: The starting sequence for indoor fan,
outdoor fan and compressors is shown as below:
Start Indoor All 4-way valves
Outdoor fan 1 Compressor 1*
Outdoor fan 2 Compressor 2*
Outdoor fan 3 Compressor 3*
Outdoor fan 4 Compressor 4*
*If available and applicable. The compressors will
be turned on one by one depending on the on/off
conditions shown in the above.
2s
2s
2s
2s
2s
15s
15s
15s
15s
2s
2s
2s
2s
15s
15s
15s
15s
2s
2s
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