Removing The Compressor - Hitachi RAS-2-HVNP Service Manual

10. Servicing
10.3.2.7 Removing the compressor
1 Remove the service cover, bottom service cover and rear cover following
bottom service cover and rear
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.
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.
N O T E
• Compressor piping must be connected by brazing. MAKE SURE that any flammable material is not around
before heating with burner for the oil inside the piping may flame 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.
350
SMGB0079 rev.0 - 01/2013
cover. When the outdoor unit is installed close to a wall remove the refrigerant piping
Removing service cover
CN5A CN8 PCN9 PCN8 PCN14 PCN13 PCN7 PCN6 PCN10 PCN5
DSW5 SEG1
ON
LED3 1 2
LED2
DSW1
ON ON
ON
1 2 2 1 3 4 5 6 2 1 3 4
ON ON RSW1 TP1 SW1
2 1 3 4 5 6 1 2 3 4 6 5 0
DSW2 DSW4
IC1
REG1
C72
TR1 C87
+
C71
LED4
PCN100
EF1
R195 PCN1
AS4755 DRM1 SC
CAUTION
Do not connect power supply
L1 L2 1 2 or transmission wiring
N to DRM1 and SC terminals.
17E26270A
Position of taking out Thermistor
Position of Taking out Thermistor
Sound-proof Cover
Sound-Proof Cover
Wire for Compressor
Wire for Compressor
Closing Nut
Closing Nut
Terminal Box Cover
Terminal Box Cover
and Removing
Rear Cover
Rear Cover
Check Joint
Check Joint
Valve Stay
Valve Stay
Holder
Holder
Thermistor at top
Thermistor
of Compressor
at Top of Compressor
Sounf-proof
Sound-Proof
Cover
Cover