Hitachi RAS-4-HNPE - Removing the Compressor

10. Servicing
350
SMGB0079 rev.0 - 01/2013
10.3.2.7 Removing the compressor
1 Remove the service cover, bottom service cover and rear cover following Removing service cover and Removing
bottom service cover and rear cover. When the outdoor unit is installed close to a wall remove the refrigerant piping
and move the unit from the wall.
2 Collect the refrigerant from the check joint.
3 Remove the valve stay.
N O T E
CheckPerformtherecoveryworkatthecheckjoint
ofpiping.Ifnot,therefrigerantremainsinside.
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
CN10
PCN9
TP1
SK1
PCN10PCN14 PCN13
PCN406
PCN8 PCN6
PCN100
PCN7 PCN5
+
C72
+
C71
DM1
+
C87
L1 1 2
L2
N
CAUTION
Check Joint
Rear Cover
Valve Stay
Rear Cover
Check Joint
Valve Stay
4 Open the soundproof cover wrapped around the compressor
and remove the terminal box cover of the compressor body.
Disconnect the compressor wires in the terminal box and dis-
connect the thermistor on top of the compressor. Remove the
soundproof cover.
N O T E
Checktheterminalcodesandmarkbandswhendiscon-
necting the wires. Connecting wires in wrong order at
reassemblingmayresultincompressordamage.
5 Remove the rubber cap and the thermistor attached on top of
the compressor.
6 Remove the crankcase heater.
Wire for Compressor
Closing Nut
Sound-Proof
Cover
Terminal Box Cover
Holder
Thermistor
at Top of Compressor
Sound-Proof Cover
Position of Taking out Thermistor
Holder
Sound-proof Cover
Wire for Compressor
Position of taking out Thermistor
Closing Nut
Thermistor at top
of Compressor
Sounf-proof
Cover
Terminal Box Cover
N O T E
• Compressorpipingmust beconnectedbybrazing. MAKESUREthatanyammablematerialisnotaround
beforeheatingwithburnerfortheoilinsidethepipingmayameup.
• Donotexposetherefrigerantcycletotheatmosphereforalongperiodtoavoidmoistureordustintothecycle.
Besuretoreplacethecompressorimmediatelyafterremoving.Sealthesuctionanddischargepipeswhenthe
refrigerantcycleisleftunattachedforalongperiod.
• Removethecapofnewcompressorrightbeforethereplacement.Beforemountingthecompressorsealthe
suctionanddischargepipeswithatapetoprotectthecompressorfromdust.Removethetapewhenblazing
thepipe.
• Forpipingat reassemblingensurethatthe compressorterminalnumbersandwiringmarkband codesare
matched.Incorrectwiringnumbersmayresultininverserotationanddamageofthecompressor.