Mitsubishi Electric PQHY-P72ZLMU-A Service Handbook page 161

[ VII Control ]
(2) System with two heat-source units
Initial startup mode starts.
The compressor on the OC starts up.
F
The total operating load of the indoor unit
after 5 minutes of operation is P96 or above.
The compressor on the OC remains in operation, and the
compressor on the OS starts up.
50 F 60Hz (both OC and OS)
Completed in the integrated operation time of 35 minutes.
or F < 50Hz (both OC and OS)
Completed in the integrated operation time of 90 minutes.
Initial startup mode complete
*1 Qj:Total capacity (model name) code
HWE15150
60Hz
(*1 Qj 50)
Yes
No
The compressor on the OC starts up.
*2
50 F 60Hz (OC)
Completed in the integrated operation time of 35 minutes.
or F < 50Hz (OC)
Completed in the integrated operation time of 90 minutes.
*3
Both the OC and OS stop.
The startup sequence of the OC and OS is rotated.
The compressor on the OS starts up.
50 F 60Hz (OS)
Completed in the integrated operation time of 35 minutes.
or F < 50Hz (OS)
Completed in the integrated operation time of 90 minutes.
*2
The air conditioning load is too small
for both the OC and the OS to
simultaneously stay in operation.
*3
The air conditioning load is
high enough for both OC and OS to
simultaneously stay in operation.
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