Mitsubishi Electric PUHZ-W50VHA Service Manual page 113

OPERATING PROCEDURE
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 connectors of CNF1, CNF2, LEV-A,
LEV-B and LEV-C on the controller circuit board.
<Symbols on the board>
• CNF1, CNF2 : Fan motor
• LEV-A, LEV-B, LEV-C : LEV-A, LEV-B, LEV-C
Remove the lead wires of LEV from wire clip (V type)
or clamp (Y type).
Disconnect the pipe-side connections of the
following parts.
• Thermistor <Liquid>(TH3)
• Thermistor <Discharge>(TH4)
• Thermistor <Plate HEX liquid>(TH6)
• Thermistor <Ambient>(TH7)
• Thermistor <Inlet water> (TH32)
• Thermistor <Suction> (TH33)
• Thermistor <Comp. surface> (TH34)
• High pressure switch (63H)
• Low pressure switch (63L)
• High pressure sensor (63HS)
• 4-way valve coil (21S4)
(5) Remove the terminal cover and disconnect the compres-
sor lead wire.
(6) Remove the sensor holder from the rear guard on back
of the unit.
(7) Remove 2 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.
Photo 5 (PUHZ-HW140V)
Controller circuit board
Terminal
block (TB1)
Wire clip Wire clip
OCH439M
Hook (right) Hook (right)
Electrical parts box fi xing screw Electrical parts box fi xing screw Electrical parts box fi xing screw
113
PHOTOS/FIGURES
Photo 4 (PUHZ-HW112/140Y)
Noise fi lter circuit
board (N.F.)
Terminal Terminal Terminal Terminal
block (TB1) block (TB2)
Controller circuit
board (C.B.) board (C.B.) board (C.B.)
Electrical
parts box
Electrical parts
box fi xing
screws
Clamp