Mitsubishi Electric PUZ-WZ50VAA Service Manual page 88

OPERATING PROCEDURE
9. Removing the compressor (MC)
Note:
Be sure to perform the work in compliance with Section 2
"Safety precaution" of this manual and check the following.
• The power-supply breaker of the appliance is turned off.
• There is no refrigerant leak from the unit.
• There is no ignition sources in work area.
• The work area is provided adequate space and ventila-
tion.
(1) Remove the inlet and outlet water pipe. *1 (See Photo 5-1)
(2) Remove the service panel, top panel and cover panel. (See
Photo 1-1)
(3) Recover refrigerant from two refrigerant circuit (INV and
FIXED) in accordance with the following procedure. *2
• Remove the refrigerant
• Purge the circuit with inert gas for 5 min
• Evacuate down the refrigerant circuit to a pressure of 30 kPa
absolute or lower
• Purge again with inert gas for 5 min
(4) Remove the side panel (R). (See Photo 5-1, 5-2)
[In case of INV. COMP]
(5) Remove the soundproof cover and lid. *4 (See Photo 6-1)
(6) Remove the two thermistors <Discharge> (TH4), <Comp.
Surface> (TH33). (See Photo 6-2)
(7) Remove the terminal cover and thermal protector. (See Photo
7-4,7-5)
(8) Remove the lead wire for compressor. *6 (See Photo 9-1)
(9) Remove the damper of discharge pipe. (See Photo 9-1)
(10) Remove the 3 points of the compressor fixing nut using a
spanner or an adjustable wrench. *5 (See Photo 9-1)
(11) Cutting the pipes inside the welded part of the compressor (2
positions) to remove the compressor. *3 (See Photo 9-2)
(12) Remove the remaining pipe welded part of the compressor.
(See Photo 9-2)
[In case of FIXED. COMP]
(5) Remove the fixing screw (1 for right / 5×12) to remove the
metal plate for the cable traps. (See Photo 9-3)
(6) Remove the soundproof cover and lid. *4 (See Photo 9-4)
(7) Remove the thermistor <Fix Suction Pipe> (TH35). (See Photo
6-2)
(8) Remove the nut of terminal cover, then open the terminal
cover. (See Photo 9-5)
(9) Remove the lead wire for compressor. *6 (See Photo 9-6)
(10) Remove the 3 points of the compressor fixing nut using a
spanner or an adjustable wrench. *5 (See Photo 9-6)
(11) Cutting the pipes inside the welded part of the compressor (2
positions) to remove the compressor. *3 (See Photo 9-7)
(12) Remove the remaining pipe welded part of the compressor.
(See Photo 9-7)
*1 Drain the water in outdoor unit before removing the water
piping.
*2 Work on the refrigerant circuit with flammable refrigerant
in safety group A3 may only be carried out by authorised
heating contractors. These heating contractors must be
trained in accordance with EN 378 Part 4 or IEC 60335-2-
40 Annex HH.
*3 Be sure to remove parts to be replaced by cutting with
pipe cutter, NOT by flame nor by electric saw, etc.
*4 When replacing the soundproof lid, fit the lid to the
wrapped cover without making a gap.
*5 Tighten the nuts of compressor with a torque of 4 ± 0.4
N·m.
*6 Be careful not to mistake the lead wires for "INV.COMP."
and "FIEXD. COMP.".
-The color of the read wire tube for INV.COMP.:
Transparent
-The color of the read wire tube for FIXED.COMP.: Black
OCH816
PHOTOS/FIGURES
Photo 9-1
Photo 9-2
Outside
Inside
Photo 9-3
Fixing screw
Metal plate for the
cable traps
Photo 9-5
Terminal cover
Nut of the terminal
cover
Photo 9-7
Outside
Outside
Inside Inside
Cutting positions
88
Damper of dis-
charge pipe
Lead wire
INV. COMP.
INV. COMP.
A
U:RED
W:BLACK
A
V:WHITE
GLASS TUBE
COLOR:WHITE
U:RED
V:WHITE
PVC TUBE
W:BLACK
COLOR:CLEAR
Compressor fix-
ing nuts
Outside
Inside
Welded part
Cutting position
Welded part
Cutting position
Photo 9-4
Lid
Soundproof cover
of FIXED. COMP.
Photo 9-6
Lead wire
Compressor fix-
ing nuts
Welded parts
FIXED. COMP.
B
C:WHITE
S:RED
R:BLACK
B
GLASS TUBE
COLOR:WHITE
C:WHITE
S:RED R:BLACK
PVC TUBE
COLOR:BLACK