Mitsubishi Daiya SRC25GZ-L1, User Manual, Page: 47 / 50

47
SRK-GZ
◆
Check point of outdoor unit (SRC502Z-L)
◆
Inspection of resistance value of Comp. dome
thermistor
Remove the connector and check the resistance value. See the section of thermistor characteristics on page 40.
◆
Inspection of reactor conductivity
◆
Check lamp
Remove the connector and check for conductivity
.It must be conductive.
●
Inspection of electronic expansion valve
To test if there is voltage. (Voltage is only applied to the electronic expansion valve when the valve angle is being changed.) Red to white Red to Orange Brown to yellow Brown to blue If the expansion valve does not operate as shown above, it is defective.
Normal if there is approximately DC 5 V 10 seconds after the power supply is turned on.
}
●
Power source and serial
signal inspection
1
to
2
: AC220/240V
2
to
3
: Normal if the voltage oscil
-
lates between DC 0 and approx. 12V
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.
~+
++
+
+
–
~
1 2 3
Y/GN
Y/GN
S.IN
RD WH BK
R.IN
G
CNB
CNB
RL
GY
DS
IC2
P
RD
U WH BK
Tho-A
Tho-R
CND
CNC
CNA
CNE
CNA
Tho-D
V
W
N
BL
AC.S AC.R
S.OUT 52X2-4
OR
WH
Re
Power source 1 Phase 220/240V 50Hz
Printed circuit board
Fuse
250V 25A
Printed circuit board
Power
transistor
CM
20S
EEV
FMo
Output voltage
(ACV)
(Example) Self-diagnosis display : Flashes 2 times
Measure in this section
Operation SW ON
8 ~ 10 sec.
0
1
◆
Power transistor inspection procedure
[Use a tester with a needle indicator for the inspection. (Do not use a digital tester
. Check in
the
AC 300 volt range.)]
(1
)
If there is a self-diagnosis display
, inspect the
compressor system (burns, wiring mistakes, etc.). If no problems are found, check the output of the power transistor
.
(2)
Output inspection procedure Disconnect the terminals for the compressor
.
If an output such as the one shown in the fig- ure on the right can be measured, the power transistor and the circuit board for the out- door unit are normal.
For about 50 seconds.
After being switched on,
there will be a delay of approximately one minute depending on the conditions.