WARNING- 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 38.
◆
Inspection of resistance value of sensor
Remove the connector and check the resistance valve.
See the section of sensor characteristics on page 29.
◆
Power source and serial signal inspection
L
to
N
: AC 220/230/240V
1
to
2/N
: AC 220/230/240V
2/N
to
3
: Normal if the voltage oscillates between
DC 0 and approx. 20V
◆
Inspection power transistor
Remove the faston terminal and test
output voltage
◆
Inspection of outdoor fan motor
See page 38.
◆
Check point of outdoor unit
Color
Color symbol
OR
Mark
Brown
BR
Yellow
／
Green
Y
／
G
Black
BK
Blue
BL
White
WH
Yellow
YE
Red
RD
Orange
Display
Voltage range
◆
Voltage check in PCB
The normal range is as follows.
①
DC280V DC230V
-
DC310V
②
DC
2
20V DC
2
18V
-
DC
2
22V
③
DC
2
13V DC
2
12V
-
DC
2
14V
④
DC
2
15V DC
2
14V
-
DC
2
16V
⑤
DC
22
5V DC
22
4V
-
DC
22
6V
⑥
DC 2.5V DC 2.3V
-
DC
2
2.5V
M
T2
（
BK
）
（
WH
）
（
RD
）
V W
U
M
CNTH
CNEEV
CNFAN
1 2 3 4
6
t
゜
R
（
OR
）
T1
（
YE
）
2
2
2
TH2 TH3 TH4
EEV
FMo
t
゜
t
゜
MS
CM
3
～
（
BL
）
（
YE
）
（
WH
）
（
RD
）
（
BK
）
N L
250V 15A
2
1
N
3
（
Y
／
G
）
20S
Outdoor unit
S.IN R.IN
C-2
②
④
⑤
⑥
③
（
RD
）
（
WH
）
（
BK
）
（
BK
）
CN20S
①
TB1
TERMINAL
BLOCK
Power source
1 Phase
AC200-240V 50Hz
Indoor
unit
(12) Outdoor unit inspection points
Models SRC25ZS-W2, 35ZS-W2
'20 • SRF-SM-311
-
36
-
