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[
IX
Troubleshooting ]
1
Although cooling operation
starts with the normal remote
controller display, the capacity
is not enough.
4. Long piping length
The cooling capacity varies great-
ly depending on the pressure
loss. (When the pressure loss is
large, the cooling capacity drops.)
Confirm that the characteristic of capacity
drop due to piping length.
The piping pressure loss can be assumed
by temperature difference between the heat
exchanger inlet temperature (TH22) and
TH2 (Te). -> Change the pipe.
5. Piping size is not proper (thin)
6. Insufficient refrigerant amount
Protection works and compressor
frequency does not rise due to
high discharge temperature.
Refer to 1-1. (Compressor frequency does
not rise sufficiently.)Refer to the page on re-
frigerant amount adjustment
7. Clogging by foreign object
Check the temperature difference between
in front of and behind the place where the
foreign object is clogging the pipe (up-
stream side and downstream side). When
the temperature drops significantly, the for-
eign object may clog the pipe.
-> Remove the foreign object inside the
pipe.
8. The indoor unit inlet temperature
is excessively. (Less than 15°C
[59°F] WB
Check the inlet air temperature and for short
cycling. Change the environment where the
indoor unit is used.
9. Compressor failure
The amount of circulating refriger-
ant decreases due to refrigerant
leak in the compressor.
Check the discharge temperature to deter-
mine if the refrigerant leaks, as it rises if
there is a leak.
10.LEV1 malfunction
Sufficient liquid refrigerant is not
be supplied to the indoor unit as
sufficient sub cool cannot be se-
cured due to LEV1 malfunction.
Refer to the page of LEV troubleshooting (9.
[4] -6- ).
It most likely happens when there is little dif-
ference or no difference between TH5 and
TH7.
11.TH5, TH7 and HPS sensor fail-
ure or faulty wiring
LEV1 is not controlled normally.
Check the thermistor.
Check wiring.
Phenomena
Cause
Check method and remedy
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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