Mitsubishi Electric PUHZ-SW75VHAR6 Service Manual page 74

PUHZ-SW100YHAR6
OPERATING PROCEDURE
1. Removing the service panel and top panel
(1) Remove 3 service panel fixing screws (5 × 12) and slide
the hook on the right downward to remove the service
panel.
(2) Remove screws (3 for front, 3 for rear/5 × 12) of the top
panel and remove it.
Note: When removing service panel and top panel at the
same time, count one less screw since they share
a screw.
2. Removing the fan motor (MF1, MF2)
(1) Remove the service panel. (See Photo 1)
(2) Remove the top panel. (See Photo 1)
(3) Remove 5 fan grille fixing screws (5 × 12) to detach the
fan grille. (Top and bottom) (See Photo 1)
(4) Remove a nut (for right handed screw of M6) to detach
the propeller. (Top and bottom) (See Photo 2-1)
(5) Disconnect the connectors, CNF1, CNF2 on controller
circuit board in electrical parts box.
(6) Loosen 6 clamps on the separator and motor support,
then unbind the lead wires.
(7) Remove 4 fan motor fixing screws (5 × 20) to detach the
fan motor. (Top and bottom) (See Photo 2-2)
Note: When attaching the fan motor, make sure to route
the cable through the hook below the fan motor
and fix firmly with the clamp.
3. Removing the electrical parts box
(1) Remove the service panel. (See Photo 1)
(2) Remove the top panel. (See Photo 1)
(3) Disconnect the indoor/outdoor connecting wire and
power supply wire from terminal block.
(4) Disconnect the connector CNF1, CNF2, LEV-A and
LEV-B on the controller circuit board.
<Symbols on the board>
• CNF1, CNF2 : Fan motor
• LEV-A, LEV-B : LEV
(5) Disconnect the pipe-side connections of the following parts.
<Diagram symbol in the connector housing>
• Thermistor <Liquid> (TH3)
• Thermistor <Discharge> (TH4)
• Thermistor <2-phase pipe, Ambient> (TH6/7)
• High pressure switch (63H)
• High pressure sensor (63HS)
• Low pressure switch (63L)
• 4-way valve coil (21S4)
• Thermistor <Comp. surface> (TH34)
(6) Remove the terminal cover and disconnect the
compressor lead wire.
(7) Loosen 3 clamps on the separator and unbind the lead
wires.
(8) Remove 3 electrical parts box fixing screws (4 × 10) and
detach the electrical parts box by pulling it upward.
The electrical parts box is fixed with 2 hooks on the left
and 1 hook on the right.
OCH755
PUHZ-SW120YHAR6
Photo 1
Grille fixing
screws
Grille fixing
screws
Photo 2-1
Nut
Photo 3-1
Front panel
74
PHOTOS/FIGURES
Top panel fixing screws
Fan grille
Photo 2-2
Front panel
Propeller
Fan motor fixing screws
Screw
Controller circuit board
8
(C.B.)
Screw
9
Continue to the next page
Top panel
Service panel
Slide
Service panel
fixing screws
Fan motor
(MF1,MF2)
Fan motor
fixing screw
Electrical
parts box
Noise filter
circuit board
(N.F.)
Terminal
block (TB2)
Terminal
block (TB1)
Valve bed
Compressor
(MC)
Terminal
cover