Mitsubishi Electric PU(H)Y-P250YGM-A, Service Handbook

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[
VII
Control ]
-9- Control at Initial Start-up
ΠWhen the unit is started for the first time, it will run the following course of operation.
(1) Flow chart of initial operation mode
(2) Initial start-up control of P500 model: time chart
Example
(3) Caution for Test Run
In the first test run after the power-on, a compressor operates for start-up confirmation. It's not a failure even if the com-
pressor alternate between start and stop. This operation will be finished in 70 minutes maximum. The flag 7 of the service
LED lights during this operation by setting the self-diagnosis switch (SW1) as below.
Start of initial operation mode
Step 1
P250
P500
Operation of No.1 compressor only
Exception : Completed if discharge superheat reaches above 25 C within
5 minutes of start-up.
Step 3
Forced operation of only No.2 compressor only
Completed in the integrated operation time of 5 minutes
Completion of initial operation mode
f 60 Hz. Completed in the integrated operation time of 25 minutes.
60 Hz or less for the first 30 minutes , 85 Hz or less after 30 minutes.
No.2 compressor not in operation.
Completed in the integrated operation time of 40 minutes. :
:
P500 type
P250 type
No.1 compressor
ON/OFF
No.2 compressor
ON/OFF
Completion of initial operation mode
40 minutes
Step 1 Step 3
5 minutes
1 2 3 4 5 6 7 8 9 10
ON
OFF