[ VII Control ]
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HWE1018A GB
-11- Refrigerant flow control (Linear expansion valve <LEV2>)
Refrigerant flow is controlled by each unit in the combined models during heating. Refrigerant flow control is performed by the
OC and OS individually. The valve opens to a specified angle during cooling (Opening: 2100 pulses)
Valve opening is controlled based on the values of high pressure (63HS1), discharge temperature (TH4), low pressure(
63LS), and piping temperature (TH5).
The valve moves to the predetermined position while the unit is stopped.
The valve opening may increase to 3000 pulses during the defrost cycle or when the units are operated in unusual operating
conditions.
-12- Control at Initial Start-up
When started up for the first time before 12 hours have elapsed after power on, the unit goes into the initial startup mode.
1. Flowchart of initial operation
Single outdoor unit system (P250 model)
Multiple outdoor unit system (P500 model)
50 F 60Hz
F < 50Hz
Initial startup mode starts.
Completed in the integrated operation time of 30 minutes.
Initial startup mode complete
Completed in the integrated operation time of 90 minutes.
Yes
No
50 F 60Hz (both OC and OS)
F < 50Hz (both OC and OS)
Completed in the integrated operation time of 30 minutes.
Completed in the integrated operation time of 90 minutes.
The compressor on the OC remains in operation, and the
compressor on the OS starts up.
50 F 60Hz (OC)
F < 50Hz (OC)
Completed in the integrated operation time of 30 minutes.
Completed in the integrated operation time of 90 minutes.
The compressor on the OC starts up.
Both the OC and OS stop.
The startup sequence of the OC and OS is rotated.
50 F 60Hz (OS)
F < 50Hz (OS)
Completed in the integrated operation time of 30 minutes.
Completed in the integrated operation time of 90 minutes.
The compressor on the OS starts up.
Initial startup mode complete
The compressor on the OC starts up.
The air conditioning load is large
enough to require a simultaneous
operation of OC and OS.
Initial startup mode starts.
F 60Hz
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