Hitachi RAS-(4-12)HNP(1)(E) - Removing the High Pressure Switch and Pressure Switch for Control; High Pressure Switch and Pressure Switch for Control; Low Pressure Switch

10 Servicing
367
SMGB0087 rev.0 - 12/2013
10
N O T E
• Topreventcontaminationoftherefrigerantbywaterorforeignmaterials,donotexposetherefrigerantpartsopento
atmosphereforlongperiods.Ifnecessary,sealpipeendsusingcapsortape.
• Removethecapforcompressorrightbeforereplacingthecompressor.Whenreplacingthecompressor,sealthetape
atthesuctionandthedischargepipestopreventforeignmaterials.Removeitwhenbrazingpipes.
• Securelycheckterminalnumbersandmarkbandsbeforedisconnectingleadwires.Whenreassemblingtheleadwires,
connectthemtomatchsurelytheterminalnumbersandthemarkbands.Iftheleadwiresareconnectedincorrectlyto
theterminal,thecompressorwillbedamagedduetoreverserotation.
10.3.8 Removing the High pressure switch and Pressure switch for control
1 Remove the service cover following “10.3.1Removingservicecover”.
2 Collect the refrigerant from the check joint according to “10.3.7Removingthecompressor”in this chapter.
High pressure switch and pressure switch for control
1 Remove the soundproof cover on the compressor.
2 Disconnect the Faston Terminals of High Pressure Switch and Pressure sensor for PD control.
3 Remove the high pressure switch and the pressure switch for control from the brazed part of discharge piping.
N O T E
Theprocedure(2)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 Open the P plate turning counter clockwise approximately 90° following “10.3.9Openingelectricalbox(Pplate)”.
• Check that the LED201 (red) on Inverter is OFF when the P plate is opened.
2 Disconnect the Faston Terminals of Low Pressure Switch.
3 Remove the low pressure switch from the brazed part of suction piping.
Upper Cover
Discharge Pipe
Brazing
Part
Brazing Part
Low Pressure Switch
(PSL)
Suction Pipe
High Pressure Switch
(PSH)
Pressure Sensor
for PD Control
Electrical Box
Discharge pipe
Electrical Box
Upper cover
High pressure switch
Pressure sensor for
PD control
Brazing
part
Low pressure switch
Suction pipe
Brazing part