Hitachi RPI-0.8FSG1 - Troubleshooting by 7-Segment Display

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TROUBLESHOOTING
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.
Output State of Outdoor
Micro-Computer
Checking Item
PSW
7-Segment
~
PSW3
SEG3
PSW2
Y20D
Y20A
Y20C
Y52C3
Y21
2
Y21 1
YOH
Y20B
1
PSW3 PSW2
 To start checking, press the "PSW2" switch
for more than 3 seconds.
 To proceed checking, press the "PSW2" switch
for less than 2 seconds.
 To proceed reversely, press the "PSW3" switch
for less than 2 seconds.
 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.
Backward Forward
PSW2 PSW3
Total of Thermo-ON
Indoor Units Capacity
PSW3 PSW2
2
PSW2 PSW3
Running Frequency of
Inverter Compressor MC1
Checking Contents
(Unit)
(Hz)
PSW3 PSW2
3
PSW2 PSW3
Number of Running
Compressor
PSW3 PSW2
4
~
PSW2 PSW3
1
(x HP)
8
~
(%)
~
~
(%)
~
Air Flow Ratio
PSW3 PSW2
5
PSW2 PSW3
Outdoor Expansion Valve
MV1 Opening
PSW3 PSW2
6
PSW2 PSW3
Outdoor Expansion Valve
MV2 Opening
PSW3 PSW2
7
PSW2 PSW3
(For 16 to 30HP)
Y52C4
Y52C1
YFAN2
AC
Chopper
YRS
Y52C2
SEG2 SEG1
PSW4
Check
Manual
Defrost
Ref. Cycle
Auto Check
PSW3PSW2PSW1