Hitachi RAS-4-HNCE - Removing the High Pressure Switch and Pressure Switch for Control

10. Servicing
353
SMGB0079 rev.0 - 01/2013
10
10.3.2.8 Removing the High pressure switch and Pressure switch for control
1 Remove the service cover and the bottom service cover following Removing service cover, and Removing bottom
service cover and rear cover.
2 Collect the refrigerant from the check joint according to Removing the compressor, in this chapter.
High pressure switch and pressure switch for control
1 Disconnect the Faston Terminals of High Pressure Switch and Pressure sensor for PD control.
2 Remove the high pressure switch and the pressure switch for control from the brazed part of discharge piping.
N O T E
Theprocedure(1)isnotrequiredwhenremovingthepressuresensorforPDcontrol.However,checktoensure
thattheconnector(CN100)onO.U.PCB1isdisconnected.
Low pressure switch
1 Disconnect the Faston Terminals of Low Pressure Switch.
2 Remove the low pressure switch from the brazed part of suction piping.
Discharge Pipe
Brazing Part
Brazing Part
Brazing Part
Low Pressure Switch (PSL)
Suction Pipe
High Pressure Switch (PSH)
Pressure Sensor for PD Control
to DRM1 and SC terminals.
or transmission wiring
Do not connect power supply
17E26270A
CAUTION
SCAS4755 DRM1
PCN1
TR1
IC1
SEG1
1 62 5
ON
3 4
1
ON
2 43
1 62 5
ON
3 41 62 5
ON
3 4
ON
21
ON
21
PSW1 PSW3
0
9
8
7
6
5
4
3
2
1
SW1
DSW3
R195
REG1
E
Y20C Y20A
Y21
Y52C
YCH
Y21SW1
Y21SW2-1
Y21SW2-2
LED3
LED2
PSW2
DSW6
RSW1
DSW1
DSW5
DSW2 DSW4
LED4
LED1
EFS1
EFR1
EF1
EF2
EF3
THM9THM10 THM7THM8
CN100
CN1 CN6 CN7
CN101
CN404
CN2
CN8CN5A
CN405 CN406
CN1
0
PCN9
TP1
SK1
PCN10PCN14 PCN13
PCN406
PCN8 PCN6
PCN100
PCN7 PCN5
+
C72
+
C71
DM1
+
C87
L1 1 2
L2
N
CAUTION
Discharge pipe
High pressure switch
Pressure sensor for PD control
Low pressure switch
Suction pipe
Brazing part
Brazing part
Brazing part