McQuay MWM Service Manual Book page 32

7. Sequential Control for Cool Mode
The starting sequence for indoor fan, outdoor fan and compressors is shown as below:
2 seconds
Start
15 seconds
15 seconds
15 seconds
15 seconds
*If available and applicable
The compressors will be turned on one by one depending on the on/off conditions shown in the
above.
8. Sequential Control for Heat Mode
The starting sequence for indoor fan, outdoor fan and compressors is shown as below:
2 seconds
Start
15 seconds
15 seconds
15 seconds
15 seconds
15 seconds
*If available and applicable
The compressors will be turned on one by one depending on the on/off conditions shown in
theabove.
Indoor fan
2 seconds
Outdoor fan 1
2 seconds
Outdoor fan 2
2 seconds
Outdoor fan 3
2 seconds
Outdoor fan 4
2 seconds
Indoor fan
2 seconds
Outdoor fan 1
2 seconds
Outdoor fan 2
2 seconds
Outdoor fan 3
2 seconds
Outdoor fan 4
15 seconds
Heater 1*
Compressor 1*
Compressor 2*
Compressor 3*
Compressor 4*
All 4 way valves
Compressor 1*
Compressor 2*
Compressor 3*
Compressor 4*
Heater 2*
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