Disassembly Procedure - Mitsubishi Electric PUHZ-W50VHA Service Manual

10

DISASSEMBLY PROCEDURE

PUHZ-W50VHA(-BS)
PUHZ-W85VHA(-BS)
: Indicates the visible parts in the photos/fi gures.
OPERATING PROCEDURE
1. Removing the service panel and top panel
(1) Remove 3 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.
2. Removing the fan motor (MF1)
(1) Remove the service panel. (See Photo 1)
(2) Remove the top panel. (See Photo 1)
(3) Remove 5 screws (5 × 12) to detach the fan grille.
(See Photo 1)
(4) Remove a nut (for right handed screw of M6) to detach
the propeller. (See Photo 2)
(5) Disconnect the connector CNF1 on controller circuit
board in electrical parts box.
(6) Remove 4 screws (5 × 25) to detach the fan motor.
(See Photo 3)
3. Removing the electrical box
(1) Remove the service panel. (See Photo 1)
(2) Remove the top panel. (See Photo 1)
(3) Disconnect the connecting wires from terminal block.
(4) Remove all the following connectors from controller
circuit board; fan motor, linear expansion valve (×2),
thermistor<Liquid>,thermistor <Discharge>, thermistor
<Plate HEX Liquid>, thermistor <Ambient>, high pressure
sensor, high pressure switch, 4-way valve and bypass
valve. Then remove a screw (4 × 8) from the valve bed
to remove the lead wire.
Pull out the disconnected wire from the electrical parts box.
<Diagram symbol in the connector housing>
• Fan motor (CNF1)
• Linear expansion valve (LEV-A and LEV-B)
• Thermistor <Liquid> (TH3)
• Thermistor <Discharge> (TH4)
• Thermistor <Plate HEX Liquid, Ambient> (TH7/6)
• Thermistor <Inlet water> (TH32)
• Thermistor <Comp. surface> (TH33, except W85VHA(-BS))
• Thermistor <Comp. surface> (TH34, HW•HA2R3(-BS)
and HW•HA2R4(-BS))
• High pressure sensor (63HS)
• High pressure switch (63H)
• Solenoid valve coil <4-way valve> (21S4)
• Solenoid valve coil <Bypass valve> (SV2)
(5) Remove the terminal cover and disconnect the compres-
sor lead wires.
(6) Remove a screw (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.
OCH439M
PUHZ-W50VHAR1(-BS)
PUHZ-W85VHAR1(-BS)
PUHZ-W50VHAR2(-BS)
PHOTOS/FIGURES
Photo 1
Fan grille Fan grille
Photo 2
Propeller
Nut
Front panel fi xing screws Front panel fi xing screws
Photo 4
Controller circuit board (C.B.)
103
PUHZ-W50VHAR3(-BS)
PHOTO: PUHZ-W85VHA
Top panel fi xing screws
Slide Slide
Grille fi xing screws Grille fi xing screws Grille fi xing screws
Photo3
Front panel Front panel
Fan motor fi xing
screws
Fan motor
fi xing screws
Electrical parts box
Electrical parts box
fi xing screw
(4 × 10)
Top panel
Service panel
Service panel
fixing screws
Fan motor
(MF1) (MF1)