10 Troubleshooting
Checking procedure for main parts
SMGB0091 rev.2 - 11/2015
276
10.4.4 Checking procedure for the electronic expansion valve for indoor and RASC units
Indoor unit electronic expansion valve
RASC unit electronic expansion valve
Locked with fully closed
Check the liquid pipe temperature during the heating
process. It is abnormal if the temperature does not
increase.
It is abnormal if the liquid pipe pressure does
not increase during the pump down process.
Locked with slightly open
It is abnormal under the following condition:
The temperature of the freeze protection thermistor
becomes lower than the suction air temperature when
the unit which is under checking stops and the other
units are under the pump down process.
Electronic expansion valve
Freeze protection thermistor
It is abnormal if the liquid pipe pressure does
not increase and the outlet temperature of
the expansion valve decreases after the
pump down process starts.
Locked with fully open
It is abnormal under the following conditions:
after the heating process for more than 30
minutes, the discharge gas temperature of
the compressor is not 10°C higher than the
condensing temperature and there is no
other faults, such as an excessive charge of
refrigerant and others.
10.4.5 Checking procedure for other parts
Resistance (Ω)
Part name
Model code
Resistance (Ω)
Unit models
Solenoid Valve Coil
SR10D
1250
(at 20ºC)
RASC-(4-10)HNPE
Reversing Valve Coil
(4-way solenoid valve)
VHV-01AP552B1
1473
(at 20ºC)
RASC-(4-10)HNPE
Compressor
E402HHD-36D2
1.839
(at 75ºC)
RASC-(4-6)HNPE
DA50PHD-D1SE2
0.396
(at 75ºC)
RASC-8HNPE
DA65PHD-D1SE2
0.320
(at 75ºC)
RASC-10HNPE
Magnetic contactor
FC-0/SP
1150
(at 20ºC)
RASC-(4-10)HNPE