Hitachi UTOPIA RAS-4HVRP2E - Refrigerant Cycle Checklist

7 Commissioning
Refrigerant cycle checklist
SMGB0136 rev.0 - 07/2021
151
7
b. When the high pressure retry control is activated, alarm code “P13” will be indicated on the 7 segment display of
the outdoor unit PCB1. If the high pressure retry control occurs 3 times or more in 30 minutes, alarm code “45”
will be indicated on the remote control LCD screen or on the 7 segment display of the outdoor unit PCB1.
SEL. OP MODE
I.U. :
MODEL :
Alarm Code:
45
O.U. :
01-01
ALM RST
ADDR
ENT.
OK
? NOTE
The high pressure may not increase until the high pressure switch is activated due to the temperature condition.
7.6 Refrigerant cycle checklist
The refrigerant cycle data can be checked on 7-segment of outdoor unit PCB during the test run and the troubleshooting.
However, it may take time for the checking because the operation cycle changes depending on the operating condition.
To check the quality of refrigerant cycle, the following check list shall be used at the test run, troubleshooting and
emergency check.
1. The most important thing in the refrigerant cycle check is to check that each expansion valve opening and the
operatingfrequencyiswithinthespeciedrange.Eachitemvariesinthevaluedependingontheoperating
frequency, indoor temperature and ambient temperature.
2. The service system tester, which automatically calculates Td and SH, facilitates the refrigerant cycle check. If
possible, record the operating cycle data by the service system tester.
CHECKLIST ON TEST OPERATION
CUSTOMER: ___________________ INSTALLER: _____________________________ DATE: ______________________
OUTDOOR UNIT MODEL: ________ OUTDOOR UNIT SERIAL NO.: ________________ INSPECTOR:_________________
Indoor unit model
Indoor unit serial number
Piping length: ____________ m Additional refrigerant charge: ___________ kg
1 General
No. Check item Result
1 Are the power source wire and the transmission wire separated from the refrigerant pipes?
2 Is the earth wire connected?
3 Is there any short-circuit?
4
For 3 phases models, is there any voltage abnormality between each phase?
(R-S, S-T, T-R)
5 For 1 phase models, is there any voltage abnormality between L and N?
2 Refrigerant cycle
a. Operation(cooling/heating)
No. Check item Result
1 Start-up all the units ("TEST RUN" mode).
2 Start-up all the indoor units in HIGH speed.
3
In the case that the constant speed compressor is repeatedly turned ON and OFF, turn off the
indoor unit (small capacity).