Checking Procedure For The Electronic Expansion Valve For Indoor And Outdoor Units; Checking Procedure For Ac Fan Motor - Hitachi RAS-2-HVNP Service Manual

8. Troubleshooting
8.4.4 Checking procedure for the electronic expansion valve for indoor and outdoor units
Locked with fully closed
Locked with slightly open It is abnormal under the following condition:
Locked with fully open
8.4.5 Checking procedure for AC fan motor
Part name Unit models
Fan motor RAS-12HN(P/C)
285
SMGB0079 rev.0 - 01/2013
Indoor unit electronic expansion valve
Check the liquid pipe temperature during the hea-
ting process. It is abnormal if the temperature
does not increase.
The temperature of the freeze protection thermis-
tor becomes lower than the suction air tempera-
ture when the unit which is under chechink stops
and the other units are under the pump down pro-
cess.
Electronic expansion valve
Freeze protection thermistor
Fan motor rated
Wiring diagram
capacity
Blue
Main coil 2
Black
KFC6S-201SA3P
200W
White
Outdoor unit electronic expansion valve
It is abnormal if the liquid pipe pressure
does not increase during the pump down
process.
It is abnormal if the liquid pipe pressure
does not increase and the outlet tempe-
rature of the expansion valve decreases
after the pump down process starts.
It is abnormal under the following condi-
tions: after the heating process for more
than 30 minutes, the discharge gas tem-
perature of the compressor is not 10°C
higher than the condensing temperature
and there is no other faults, such as an ex-
cessive charge of refrigerant and others.
Lead wire colour
Auxiliary coil
Black-White
Black-Blue
Main
Black-Red
coil 1
Thermo
Orange
Red
8
Resistance (Ω) (at 20ºC)
17.0+-10%
25.3+-10%
20.1+-10%