McQuay MWM Service Manual page 30

MCQUAY Service Guide Book
6. Defrost Option
Select whether compressor will turn off or remain
on when 4WV changes at beginning of defrost
cycle.
a. Compressor off
b. Compressor on
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:
2s
Start Indoor
15s
Outdoor fan 1
15s
Outdoor fan 2
15s
Outdoor fan 3
15s
Outdoor fan 4
Heat Mode: The starting sequence for indoor fan,
outdoor fan and compressors is shown as below:
2s
2s
Start Indoor
15s
Outdoor fan 1
15s
Outdoor fan 2
15s
Outdoor fan 3
15s
Outdoor fan 4
*If available and applicable. The compressors will
be turned on one by one depending on the on/off
conditions shown in the above.
Dip switch 8
Off
On (C2.4 spec)
2s
Compressor 1*
2s
Compressor 2*
2s
Compressor 3*
2s
Compressor 4*
All 4-way valves
2s
Compressor 1*
2s
Compressor 2*
2s
Compressor 3*
2s
Compressor 4*
29
Controller Configuration