-
124
-
'17 • PAC-T-256
(7) Outdoor unit control failure diagnosis circuit diagram
2
2
2
2
2
2
2
2
2
22
22
22
2
Models SRC40ZSX-S, SRC50ZSX-S, 60ZSX-S
CAUTION - HIGH VOLTAGE
High voltage is produced in the control box. Don't touch
electrical parts in the control box for 5 minutes after the
unit is stopped.
◆
Inspection of electronic
expansion valve
See page 125.
◆
Inspection of resistance valve of sensor
Remove the connector and check the resistance valve.
See the section of sensor characteristics on page 156-158.
◆
Power source and serial signal inspection
L
to
N
: AC220/230/240V
1
to
2/N
: AC220/230/240V
2/N
to
3
: Normal if the voltage oscillates between
DC0 and approx. 20V
◆
Inspection power transistor
Remove the faston terminal and test
output voltage
◆
Inspection of outdoor fan motor
See page 125.
◆
Check point of outdoor unit
Color
Color symbol
RD
Mark
Yellow
/
Green
Y
/
G
Black
BK
Blue
BL
Yellow
YE
White
WH
Red
Display
Voltage range
◆
Voltage check in PCB
The normal range is as follows.
①
DC280V DC230V
-
DC310V
②
DC 20V DC 18V
-
DC 22V
③
DC 13V DC 12V
-
DC 14V
④
DC 15V DC 14V
-
DC 16V
⑤
DC 5V DC 4V
-
DC 6V
⑥
DC 2.5V DC 2.3V
-
DC 2.5V
M
T1
(
WH
)
(
BK
)
(
RD
)
V W
U
M
CNTH
CNEEV
CNFAN
1 2 3 4
6
t
゜
L1
(
YE
)
T2
(
YE
)
2
2
2
TH1 TH2 TH3
EEV
FMo
t
゜
t
゜
MS
CM
3
~
(
BR
)
(
OR
)
(
RD
)
(
BL
)
(
WH
)
T1
1
L2
(
BL
)
T12
(
BL
)
(
WH
)
(
BK
)
(
WH
)
N
L
250V 20A
FUSE
2
1
N
3
(
Y
/
G
)
(
Y
/
G
)
(
RD
)
(
RD
)
20S
TB1
TB2
TERMINAL
BLOCK
TERMINAL
BLOCK
(
WH
)
(
BK
)
Power source
1 Phase
AC200-240V 50Hz
Indoor
unit
Outdoor unit
①
②
④
⑤
⑥
R.IN
(
BK
)
S.IN
C-2
③
(
BK
)
CN20S