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[
IX
Troubleshooting ]
Check whether the BC board output signal corresponds with the solenoid valve operation correspond.
Note1 SVA, SVB, SVC
SVA, SVB, and SVC turn on or off according to the indoor unit operation mode.
SVM,SVM2
SVM1 and SVM2 turn on or off according to the operation mode.
Note2 SVA, SVB, SVC
Measure the temperature at the upstream and downstream pipes and of SVA.
Measure the temperature at the upstream and downstream pipes and of SVA.
4. BC controller transformer
*Before measuring the resistance, pull out the connector.
Mode
Cooling
Heating
Stopped
Defrost
Fan
Port
SVA
ON
OFF
OFF
OFF
OFF
SVB
OFF
ON
OFF
OFF
OFF
SVC
ON
OFF
OFF
OFF
ON
Operation
mode
Cooling only
Cooling main
Heating only
Heating main
Defrost
Stopped
SVM1
ON
Pressure differ-
ential control
OFF or ON
OFF
OFF
ON
OFF
SVM2
OFF
OFF
Pressure differ-
ential control
OFF or ON
Pressure dif-
ferential con-
trol
OFF or ON
OFF
OFF
Normal
Abnormal
CNTR(1) - (3)
about 58 ohm.
Open-phase or shorting
CN03(1) - (3)
about 16 ohm.
CNTR
CN03
BC controller control board
Red
White
Red
Red
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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