Mitsubishi Electric PUZ-WZ50VAA Service Manual page 80

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 in accordance with the following proce-
dure. *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
7-3, 7-4)
(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 nuts using a
spanner or an adjustable wrench. *5 (See Photo 9-1)
(11) Cutting the pipe inside the welded parts 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)
*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.
OCH816
PHOTOS/FIGURES
Photo 9-1
INV. COMP.
W:BLACK
A
V:WHITE
W:BLACK
Photo 9-2
Outside
Inside
80
Damper of dis-
charge pipe
Lead wire
INV. COMP.
Compressor
fixing nuts
A
U:RED
V:WHITE
GLASS TUBE
COLOR:WHITE
U:RED
PVC TUBE
COLOR:CLEAR
Outside
Inside
Welded part
Cutting position
Welded part
Cutting position