Mitsubishi Electric PUHY-P250YNW-A Service Handbook page 102

[5-2 Outdoor Unit Control ]
(2) P500YSNW model
Initial startup mode starts.
The compressor on the OC starts up.
F
The air conditioning load
is large enough to require a simultaneous
operation of OC and OS.
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.
or the discharge superheat (TH4 - Tc) is detected (within
5 minutes of startup) that remains above approximately
25 degrees for one minute or if the shell bottom SH
(TH15-Te) is 15 deg or above (for continuous 5 minutes)
10 minutes after start up.
Initial startup mode complete
BS_05_C
60Hz
Yes
No
The compressor on the OC starts up.
*1
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.
or the discharge superheat (TH4 - Tc) is detected (within
5 minutes of startup) that remains above approximately
25 degrees for one minute or if the shell bottom SH
*2
(TH15-Te) is 15 deg or above (for continuous 5 minutes)
10 minutes after start up.
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.
or the discharge superheat (TH4 - Tc) is detected (within
5 minutes of startup) that remains above approximately
25 degrees for one minute or if the shell bottom SH
(TH15-Te) is 15 deg or above (for continuous 5 minutes)
10 minutes after start up.
*1
The air conditioning load is too small for both the OC and the OS to
simultaneously stay in operation.
*2
The air conditioning load is high enough for both OC and OS to
simultaneously stay in operation.
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chapter 5 -