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

10. Servicing
382
SMGB0079 rev.0 - 01/2013
10.3.4.8 Removing High pressure switch and pressure switch for control
1 Remove the service cover following Removing service cover in this chapter.
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
Electrical Box
Upper cover
High pressure switch
Pressure sensor for PD control
Brazing part
Rear cover
Brazing part
Suction pipe
Brazing part
Low pressure switch
Brazing part
Low pressure switch
Pressure sensor
for control
High pressure switch

Opening electrical box (P-Mounting Plate)
1 Remove the service cover following Removing service cover in this chapter.
2 Remove 5 screws which x the electrical box and open the P plate turning counter clockwise approximately 90°.
• Check that the LED201 (red) on the inverter PCB (PCB2) is OFF when opening P-mounting plate.
2 xing
screws
Power plate
Upper cover
2 xing
screws
1 xing
screws
D A N G E R
DONOTtouchelectricalcomponentswhiletheLED201(Red)orLED1(Red)areONtoavoidelectricalshock.Wait
untiltheLEDsturnoff.