-
218
-
'16 • SCM-T-199
◆
Inspection power transistor
Remove the fasten terminal and test
output voltage
◆
Inspection of resistance value of sensor
Remove the connector and check the resistance value.
See the section of sensor characteristics on page
209.
BK
WH
RD
V W
U
FMo
CM
CNTH
CNFAN
M
3
～
M
T2
T1
L
OR
YE
2
2
2
t
゜
t
゜
t
゜
Tho-R Tho-A Tho-D
S
R
SNSUB
S-2
C-2
CN20V
②
①
⑥
④
⑤
③
Model SCM50ZS-S
◆
Inspection of resistance value of sensor
Remove the connector and check the resistance value.
See the section of sensor characteristics on page
XX
.
UNIT A
UNIT B
UNIT C
Power source
1 Phase
AC220-240V 50Hz
EEV A
BK
WH
WH
S-1
CNMAIN
S
IN
R
IN
BK
WH
S
O
R
O
250V 15A
/
FUSE
CN20S
G2
Y
/
G
RD
C-1
CN20V
5
2
G1
Y
/
G
G
Y
/
G
CNEEV1
CNEEV3
CNTH
TB2
CNA
CNB
CNC
TB1
N
L
EEV B
EEV C
Y
/
G
WH
BK
M
M
M
WH
RD
BL
PCB 2
（
SUB
）
PCB 1
（
MAIN
）
20S
HEATER
WH
RD
CNHEAT
250V 20A
3
2
1 BK
WH
RD
3
2
1
3
2
1
BK
WH
BR
BK
WH
BL
t
゜
2
Tho-S
Color marks
Mark
Color
BK
BR
Black
BL
Blue
Brown
RD
Y
／
G
Red
Yellow
／
Green
WH
White
OR
Orange
YE
Yellow
◆
Inspection of outdoor fan motor
See page 219.
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.
◆
Power source and serial signal inspection
①
to
②
: AC220/230/240V
②
to
③
: Normal if the voltage oscillates between
DC0 and approx. 20V
◆
Inspection of electronic expansion valve
See page 219.
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
