-
54
-
Printed circuit
board
F2 (250V 20A)
WH
RD
U
V
W
BK
C2
S.IN
R.IN
Re
G
Th4
Th5
Th6
CNB
CNE
CNA
CND
N
P
Power
transistor
20S
EEV
FMo
DS
CM
BK
WH
RD
Y/GN
1
2
3
◆
Inspection of resistance v
alue of disc
har
g
e
pipe
sensor
Remove the connector and check the resistance value.
See the section of sensor characteristics on page 48.
◆
Inspection of electr
onic e
xpansion v
alve
T
o
test if there is v
olta
g
e
.
◆
Chec
k point of outdoor unit (20~35 type)
If the e
xpansion v
alve does not operate as sho
wn abo
ve
, it is def
ective
.
(V
oltage is only applied to the electronic expansion valve when the valve opening
is being changed.)
Red to
White
Red to Orange
Brown to
Y
ellow
Brown to Blue
Normal if there is approximately DC 5
V
10 seconds
after the power asupply is turned on.
Color symbol
BK
RD
WH
Y/GN
Black
Red
White
Y
ellow/Green
◆
Inspection of input to PCB
¡
Check the voltage between terminals
1
~
2
on the terminal block.
(It is
normal if
AC 220/230/240V
is detected.)
◆
Inspection of serial signal
Check the voltage between terminals
2
~
3
on the terminal block.(It is normal
if the needle swing in the range of DC
0~Approx.12V)
CA
UTION
-
HIGH
V
O
L
T
A
GE
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.
