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 84.
◆Inspection of resistance valve of sensor
Remove the connector and check the resistance valve.
See the section of sensor characteristics on page 74.
◆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 fasten terminal and test
output voltage
◆Inspection of outdoor fan motor
See page 84.
◆Check point of outdoor unit
Color
Color symbol
OR
Mark
BrownBR
Yellow/GreenY/G
BlackBK
BlueBL
WhiteWH
RedRD
Orange
Display Voltage range
◆Voltage check in PCB
The normal range is as follows.
①DC280V DC230V - DC310V
②DC220V DC218V - DC222V
③DC213V DC212V - DC214V
④DC215V DC214V - DC216V
⑤DC225V DC224V - DC226V
⑥DC 2.5V DC 2.3V - DC
2
2.5V
M
T2
(BK)
(WH)
(RD)
V WU
M
CNTH
CNEEV
CNFAN
1 2 3 4 6
t゜
R
(OR)
T1(YE)
2 2 2
TH1 TH2 TH3
EEV
FMo
t゜
t゜
MS
CM
3~
(WH)
(OR)
(BR)
(RD)
(BL)
(BK)
(WH)
(WH)
(BK)
(WH)
(WH)
(BK)
(BK)
PCB ASSY (SUB)
S-1
CNMAIN
S
IN
R
IN
R
OUT
(BK)
(WH)
G1
G3
(Y/G)
(Y/G)
(BR)
S
O
R
O
N
L
250V 20A
FUSE
2
1
N
3
(Y/G)
(Y/G)
CN20S
(RD)
(RD)
20S
TB1
TB2
TERMINAL
BLOCK
TERMINAL
BLOCK
(WH)
250V 10A
F10
4
(BK)
Power source
1 Phase
AC200-240V 50Hz
Indoor
unit
Outdoor unit
R
S
①
②
④
⑤
⑥
S-2
C-2
③
PCB ASSY (MAIN)