Control At Initial Start-Up - Mitsubishi Electric PU(H)Y-P250YGM-A Service Handbook

-9- Control at Initial Start-up

When the unit is started for the first time, it will run the following course of operation.
(1) Flow chart of initial operation mode
Step 1
Operation of No.1 compressor only
P250
P500
Exception : Completed if discharge superheat reaches above 25 C within
Step 3
Forced operation of only No.2 compressor only
Completed in the integrated operation time of 5 minutes
(2) Initial start-up control of P500 model: time chart
Example
No.1 compressor
ON/OFF
No.2 compressor
ON/OFF
(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
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.
5 minutes of start-up.
P500 type
Completion of initial operation mode
40 minutes
Step 1
ON
OFF
1 2 3 4 5 6 7 8 9 10
- 85 -
P250 type
Completion of initial operation mode
5 minutes
Step 3
[ VII Control ]