[
VIII
Control ]
- 75 -
HWE07150
GB
(3) Stopping the defrost operation
The defrost operation ends when 12 minutes have passed since the beginning of the defrost operation or when the pipe tem-
perature (TH3) has been continuously detected to be at 10°C [50°F] or above for 4 minutes.
Defrost operation will not stop its operation for 2 minutes once started unless the piping temperature exceeds 25°C [77°F]
within 2 minutes, in which case the operation will stop.
In the multiple-outdoor-unit system, defrosting is stopped on all units at the same time.
(4) Problems during defrost operation
If a problem is detected during defrost operation, the operation will be stopped, and the defrost prohibition time based on the
integrated compressor operation time will be set to 20 minutes.
(5) Change in the number of operating indoor units during defrost operation
Even when there is a change in the number of operating indoor units during defrost operation, the operation will continue, and
an adjustment will be made after the completion of the defrost operation.
Defrost operation will be continued, even if the indoor units stop or under the Thermo-OFF conditions until it has run its course.
-8- Refrigerant Recovery Control
Recovery of refrigerant is performed during heating operation to prevent the refrigerant from accumulating inside the unit while
it is stopped (unit in fan mode), or inside the indoor unit that is in cooling mode or in heating mode with thermo off. It is also
performed during cooling operation to prevent an excessive amount of refrigerant from accumulating in the outdoor heat ex-
changer.
It is also performed during cooling operation to prevent an excessive amount of refrigerant from accumulating in the outdoor
heat exchanger.
(1) During heating operation
Starting refrigerant recovery mode
The refrigerant recovery mode in heating starts when all of the following three conditions are met:
15 minutes have passed since the completion of previous refrigerant recovery.
TH4 > 115°C [239°F]
Frequencies below 50 Hz
Refrigerant recovery
1) Refrigerant is recovered with the LEV on the applicable indoor unit (unit under stopping mode, fan mode, cooling, heating with
thermo off) being opened for 30 seconds.
2) Periodic capacity control of the outdoor units and periodic LEV control of the indoor units will be suspended during refrigerant
recovery operation; they will be performed after the recovery has been completed.
Opening of LEV during refrigerant recovery
Opening of indoor unit LEV: 400 pulses
Initial opening of LEV
Start
Finish
30 seconds
Содержание City Multi PFAV-P500VMH-E
Страница 1: ......
Страница 11: ... 2 ...
Страница 23: ... 14 ...
Страница 25: ... 16 ...
Страница 37: ... 28 ...
Страница 39: ... 30 ...
Страница 48: ... 39 HWE07150 GB IV Indoor Unit Structure 1 External View 41 2 Control Box 42 3 Board 43 4 Fan 44 ...
Страница 49: ... 40 ...
Страница 50: ... IV Indoor Unit Structure 41 HWE07150 GB IV Indoor Unit Structure 1 External View PFAV P500VMH E ...
Страница 55: ... 46 ...
Страница 59: ... 50 ...
Страница 61: ... 52 ...
Страница 65: ... 56 ...
Страница 66: ... 57 HWE07150 GB VII Refrigerant Circuit 1 Refrigerant Circuit Diagram 59 2 Principal Parts and Functions 60 ...
Страница 67: ... 58 ...
Страница 73: ... 64 ...
Страница 75: ... 66 ...
Страница 95: ... 86 ...
Страница 107: ... 98 ...
Страница 195: ... X Troubleshooting 186 HWE07150 GB ...
Страница 196: ... 187 HWE07150 GB XI LED Monitor Display on the Outdoor Unit Board 1 How to Read the LED on the Service Monitor 189 ...
Страница 197: ... 188 ...
Страница 242: ......