Mitsubishi Electric PUZ-WZ50VAA Service Manual page 75

11 DISASSEMBLY PROCEDURE
PUZ-WZ50VAA.UK
PUZ-WZ50VAA-BS.UK
OPERATING PROCEDURE
1. Removing the service, top and cover panels
Note: Be sure to read Section 2 "Safety precaution" of this
manual and perform the work in compliance with this
safety requirement before starting the work. Be sure to
check that there are no leakage of R290 refrigerant and
no source of ignition.
(1) Remove the service panel fixing screws (3 for front *2 and
1 for right/ 5 × 12), then slide the service panel downward
to remove it. (The service panel is fixed to the side panel (R)
with a hook on the right side.)
(2) Remove the top panel fixing screws (3 for front, 3 for rear
and 1 for right/ 5 × 12) to remove the top panel. *1
(3) Remove the cover panel fixing screws (1 for front and 1 for
right side/ 5 × 12), then slide the cover panel upward to
remove it. (See Photo 1-1)
*1 When removing service panel and top panel at the
same time, count 2 less screws since they share
screws.
*2 The 3 screws for front of the service panel are the hex-
alobular internal screws. Please use the tools which
can fit those screws. (see photo 1-2)
2. Removing the electrical parts box
(1) Remove the service panel. (See Photo 1-1)
(2) Remove the top panel. (See Photo 1-1)
(3) Disconnect the power supply cable from terminal block.
(4) Disconnect the indoor/outdoor connecting wire from terminal block.
(5) Disconnect the connectors CNF1 (WH) from the
controller circuit board.
<Symbols on the board>
• Fan motor (CNF1)
• Thermistor <Liquid> (TH3)
• Thermistor <Discharge> (TH4)
• Thermistor <Ambient/ 2-Phase pipe> (TH7/6)
• Thermistor <Comp. Surface> (TH33)
• Thermistor <Plate Hex Liquid> (TH34)
• High pressure switch (63H)
• Pressure sensor (63HS)
• 4-way valve (21S4)
• LEV (LEV-A, LEV-B)
(6) Disconnect the following relay connectors. (See Photo2-2)
- TH3, TH4, TH7/6, TH33, TH34 (WHITE)
- 63HS (WHITE)
- LEV-A (WHITE)
- LEV-B (RED)
- 63H, 21S4(WHITE)
- COMP INV (WHITE)
(7) Loosen the clamp and the clip for the lead wire of the fan motor.
(See Photo 2-3)
(8) Remove the front panel fixing screw (1 for front/ 5 × 12) and the
panel hook fixing screws (2 for front/ 5 × 12)to remove the elec-
trical parts box. (See Photo 2-1, 2-4, 2-5)
(9) Lift the electrical parts box up to remove it.*1
*1 Be careful not to hit the surrounding piping when
removing the electrical parts box.
Photo 2-5
OCH816
PUZ-WZ60VAA.UK
PUZ-WZ60VAA-BS.UK
Photo 1-1
Wire grill fixing screws
Photo 1-2
Photo 2-1
Photo 2-2
Photo 2-3
Photo 2-4
75
PHOTOS/FIGURES
Top panel fixing screws
Cover panel
fixing screws
Clamp for the lead wire
of the fan motor
Front panel fixing
screw
Clip for the lead wire of
the fan motor
Indoor/outdoor con-
necting wire
Power supply cable
Relay connector (LEV-B)
Relay connector
(Thermistor
<TH3/4/6/7/33/34>)
Relay connector
(63H/21S4)
Relay connector (LEV-A)
Relay connector
(63HS)
Relay connector (COMP_INV)
Clamps for the lead wire
for thermal protector and
compressor
Top cover fixing screws
Panel hook fixing screws
Top cover plate
Top cover fixing screws
Top panel
Side panel
Service panel
fixing screws *2
Service panel
Cover panel