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[
VII
Control ]
-7- Defrost Operation Control <PUHY>
(1) Starting the defrost operation
Defrost operation is started when the pipe temperature (TH5) of -10°C [14°F] or below (-8°C [18°F] or below for P126-
type and above) has continuously been detected for 3 minutes after the integrated compressor operation time of 50 min-
utes have passed (90 minutes when the defrost prohibit timer is set to 90 minutes).
If 10 minutes have passed since compressor start-up or since the completion of defrost operation, forced defrost opera-
tion will start by turning on the forced defrost switch (DIP SW2-7).
Even if the defrost prohibit timer is set to 90 minutes, the actual defrost prohibit time for the next operation will be 50
minutes if defrosting took 12 minutes.
(2) Defrost operation
(3) Stopping the defrost operation
Defrost operation will stop when 12 minutes have passed since the beginning of defrost operation (15 minutes when the
defrost prohibit timer is set to 90 minutes), or when the piping temperature (TH5) of 10°C [50°F] or above has been con-
tinuously detected for 2 minutes (TH5 above 7°C [45°F] for 2 minutes for P126 model and above).
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 (Above 20°C [68°F] within 2 minutes for P126 model and above).
(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.
Compressor frequency
Model
No.1 Compressor
No.2 Compressor
P72 model
52
-
P96 model
53
-
P108 model
65
-
P126 model
114
-
P144 model
114
-
P168 model
(50/60 Hz)
70/60
ON (50/60 Hz)
P192 model
(50/60 Hz)
70/60
ON (50/60 Hz)
P204 model
(50/60 Hz)
110/100
ON (50/60 Hz)
P216 model
(50/60 Hz)
110/100
ON (50/60 Hz)
P234 model
(50/60 Hz)
110/100
ON (50/60 Hz)
Outdoor unit fan
Stopped
SV1 ON
SV3
(P168-P234 models only)
ON
21S4a OFF
21S4b
(P144-P234 models only)
OFF
SV5b
(P144-P234 models only)
OFF
LEV1 480
pulses
Содержание PUHY-P168
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Страница 99: ... 90 III Outdoor Unit BC Controller Components 2 RELAY BOARD RELAY 4 board 3 RELAY BOARD RELAY 10 board ...
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Страница 126: ... 117 VI Refrigerant Circuit 1 Refrigerant Circuit Figure 119 2 Principal Parts and Functions 126 ...
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Страница 134: ... 125 VI Refrigerant Circuit 3 CMB P104 and P108NU GB sub TH25 TH22 LEV3a CP Solenoid valves Block Check valves Block ...
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Страница 366: ... 357 IX Troubleshooting ...
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Страница 368: ... 359 X LED monitor display on the outdoor unit board 1 How to read the LED on the service monitor 361 ...
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