Outdoor Unit Inspection Points - Mitsubishi Heavy Industries SRF25ZS-W Service Manual

(12) Outdoor unit inspection points

Models SRC25ZS-W2, 35ZS-W2
◆Check point of outdoor unit
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.
Color symbol
Mark Color
BK Black
BL Blue
BR Brown
OR Orange
RD Red
WH White
YE Yellow
Y／G Yellow／Green
Outdoor unit
④
U V
MS
3～
CM
◆Inspection power transistor
Remove the faston terminal and test
output voltage
◆Voltage check in PCB
The normal range is as follows.
Display Voltage range
①DC280V DC230V - DC310V
②DC220V DC218V - DC222V
③DC213V DC212V - DC214V
④DC215V DC214V - DC216V
⑤DC225V DC224V - DC226V
⑥DC 2.5V DC 2.3V - DC22.5V
①
CNTH
W
2 2 2
TH2 TH3 TH4
◆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
R
②
⑤
⑥
CNFAN
1 2 3 4
M
FMo
◆Inspection of outdoor fan motor
See page 38.
36
- -
'20 • SRF-SM-311
to : AC 220/230/240V
L N
to : AC 220/230/240V
1 2/N
to : Normal if the voltage oscillates between
2/N 3
DC 0 and approx. 20V
Power source
1 Phase
AC200-240V 50Hz
TERMINAL N L
BLOCK
TB1
2
3 1
N
C-2
S.IN R.IN
③
CNEEV
6
M
EEV
◆Inspection of electronic
expansion valve
See page 38.
Indoor
unit
CN20S
20S