Hitachi RAS-(3-6)HVRNM2E Service Manual page 320

8 Troubleshooting
• Checking procedure for the electronic expansion valve
Valve position
Locked fully closed
Locked slightly open
Locked fully open
• Other parts
Part name
Drain up motor
Solenoid gas for gas bypass
Solenoid gas for gas bypass (1/4)
Reversing valve
Compressor motor
310
SMGB0064 rev.0 - 08/2011
Electronic expansion valve
Check the temperature of the piping in the heat-
ing process. Failure of the temperature to rise
indicates a fault.
The following conditions indicate a fault:
• Where the freeze protection thermistor tem-
perature is lower than the intake air tem-
perature.
Where the unit being inspected stops and other
units continue operating in cooling mode.
Electronic expansion valve
Freeze protection thermistor
Unit models
RCI-1.0-FSN3E
RCIM-1.5-.5FSN2
RPI-2.0-6.0FSN3E
RCD.1.0~6.0FSN2
RAS-8HRNM to
RAS-12HRNM
Outdoor unit electronic expansion valve
It is abnormal if the liquid pipe pressure does
not increase during the cooling process.
It is abnormal if the liquid pipe pressure does
not increase and the outlet temperature of the
expansion valve decreases after the cooling
process starts.
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 refriger-
ant and others.}
Model code
ADP-1403
KJV-1004
105-52-52 (50Hz)
105-52-51 (60Hz)
VPV-MOAJ502B1 (50Hz)
VPV-MOAG579A1 (60Hz)
STF-01AJ502D1 (50Hz)
STF-01AI511A1 (60Hz)
E655DHD-65D2 (380-415V)
E655DHD-65A2 (220V)
Resistance (Ω)
139.00
at 21 ºC
347.00
at 20 ºC
1540.00
at 20 ºC
1250.00
at 20 ºC
1435.00 at 20 ºC
952.00 at 20 ºC
1435.00
at 20 ºC
1358.00
at 20 ºC
0.839
at 20 ºC
0.199 at 20 ºC