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1.2.4
Troubleshooting by 7-Segment Display
(1) Checking Method by 7-Segment Display
By using the 7-segments and check switch (PSW) on the PCB1 in the outdoor unit, total quantity of
combined indoor units, 7-segments operation conditions and each part of refrigeration cycle, can be
checked.
Check
PSW
Manual
Defrost
PSW1
PSW2
7-Segment
SEG3
SEG2
Checking Item
Output State of Outdoor
1
Micro-Computer
Total of Thermo-ON
2
Indoor Units Capacity
Running Frequency of
3
Inverter Compressor MC1
Number of Running
4
Compressor
5
Air Flow Ratio
Outdoor Expansion Valve
6
MV1 Opening
Outdoor Expansion Valve
7
MV2 Opening
(For 16 to 30HP)
Ref. Cycle
Auto Check
PSW3
PSW3
PSW4
Backward Forward
SEG1
PSW3
PSW2
PSW3
PSW2
PSW3
PSW2
PSW3
PSW2
PSW3
PSW2
PSW3
PSW2
PSW3
PSW2
G To start checking, press the "PSW2" switch
for more than 3 seconds.
G To proceed checking, press the "PSW2" switch
for less than 2 seconds.
PSW2
G To proceed reversely, press the "PSW3" switch
for less than 2 seconds.
G To cancel this checking, press the "PSW2"
switch for more than 3 seconds. The display
will be changed to the indication one step before.
Then, press the "PSW2" switch once again for
more than 3 seconds.
PSW2
Checking Contents
PSW3
PSW2
PSW3
PSW2
PSW3
PSW2
PSW3
PSW2
PSW3
PSW2
PSW3
PSW2
PSW3
TROUBLESHOOTING
Y20D
Y52C4
Y20A
Y52C1
Y20B
Y52C2
Y20C
Y52C3
YOH
YRS
AC
Y21
1
Chopper
Y21
YFAN2
2
(Unit)
1
~
(x
HP)
8
~
(Hz)
~
~
~
(%)
~
(%)
1-85
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Troubleshooting
