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

10. Servicing
405
SMGB0079 rev.0 - 01/2013
10
10.4.1.14 Removing Electronic expansion valve and Solenoid valve
1 Remove the service cover, the bottom service cover, the rear cover and the upper cover following Removing service
cover, Removing bottom service cover and rear cover and Removing upper 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 (SVA) Brazed Parts: 2
a. Remove the electronic expansion valve and the solenoid 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.
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
10.4.1.15 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)