Troubleshooting By 7-Segment Display; Simple Checking By 7-Segment Display; Checking Method By 7-Segment Display - Hitachi FSG1 Series Technical Catalogue

TROUBLESHOOTING
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18.4 TROUBLESHOOTING BY 7-SEGMENT DISPLAY

18.4.1 SIMPLE CHECKING BY 7-SEGMENT DISPLAY

vTurn on All Indoor Units
1
¯
2 Turn on All Outdoor Units
¯
3 Auto-addressing starts
Outdoor Unit
Circuit Board

18.4.2 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 refrigerant cycle can be checked.
Check
Manual
PSW
Defrost
PSW1 PSW2 PSW3
7-Segments
& & &
· ·
SEG3 SEG2 SEG1
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
v All the Indoor Units Connected to the Outdoor Unit
During auto-addressing, the following items can be checked using the outdoor
unit's on-board 7-segment LED display.
1. Disconnection of power supply to the Indoor Unit.
PCB 1
2. Reverse connection of the operating line between the Outdoor and Indoor
Units
3. Duplication of Indoor Unit number.
PSW3 PSW2
· ·
· ·
· ·
Backward Forward
·
PSW3
S C
PSW2
PSW3
o P
PSW2
PSW3
H 1
PSW2
PSW3
C C
PSW2
to next page
n To start checking, press the "PSW2" switch for more than 3
seconds.
n To proceed checking, press the "PSW2" switch for less than 2
seconds.
n To proceed reversely, press the "PSW3" for less than 2 seconds.
n 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 than3
seconds.
PCB Relay Part Name
Y20A
Y20B Relay for Solenoid Valve (SVA/B/C)
Y20C
Y20D Relay for Cranckcase heater
Y211
Relay for 4-way Valve
Y212
YRS Relay for Relay Contactor
PSW2
Checking contents
ƒ „
PSW3
PSW2
2 6
PSW3
PSW2
1 0 0
PSW3
PSW2
2
PSW3
PCB Relay Part Name
Y52C1
Y52C2
Relay for Compressor
Y52C3
Y52C4
AC Chopper Relay for AC Chopper Fan
nd
YFAN2 Relay for 2 fan at fix speed
Y20D
Y20C Y20B
000 240
~ (x 1/8 HP)
000 115
~
0 4
~
(Hz)