Hitachi RAS-4-HNC - Removing Electrical Components; Removing Electronic Expansion Valve and Solenoid Valve

10. Servicing
343
SMGB0079 rev.0 - 01/2013
10
10.3.1.14 Removing Electronic expansion Valve and Solenoid Valve
1 Remove the service cover, the bottom service cover and the rear cover following Removing service cover and Remo-
ving bottom service cover and rear cover.
2 Recover the refrigerant from check joints according to Removing Compressor.
3 Remove the coils according to Removing Electronic Expansion Valve Coil and Removing Solenoid Valve Coil.
4 Remove the brazed parts as shown in the gures.
- Electronic Expansion Valve (EVO) Brazed Parts: 2
- Solenoid Valve (SVC) Brazed Parts: 2
a. Remove the electronic expansion valve and the so-
lenoid valve with cooling the valve bodies by wet
cloth.
b. Perform the brazing work with attention not to burn
the electrical wirings and the piping insulations.
Electronic
Expansion Valve (EVO)
Solenoid Valve (SVC)
Brazing Part
Brazing Part
Electronic
expansion
valve
Solenoid valve
(SVA)
Brazing parts
Brazing
parts
5 When reassembling after replacing the valves, perform in the reverse procedure of removing.
N O T E
Runtheleadwirestobelocatedtotheoriginalposition,andxthembytheplasticband
10.3.1.15 Removing electrical components

Removing control PCB (PCB1)
1 Remove the service cover following Removing service cover.
2 Remove all the wiring connected to the control PCB.
D A N G E R
DO NOT touch electrical components while the LED1
(Red)isONtoavoidelectricalshock.WaituntiltheLED
turnsoff.
3 Remove the 6 holders. Clamp the middle part of the holders
with long-nose pliers and remove it toward front side.
D A N G E R
DONOTtouchtheelectricalcomponentsonthePCB.
PayattentionnottobendorapplymuchforceontoPCB
inordertoavoidPCBfailure.
Holder
Printed Circuit Board (PCB1)
Holder
Printed Circuit Board (PCB1)