Mitsubishi Electric PUZ-HWM140VHA Service Manual page 69

OPERATING PROCEDURE
3. Removing the electrical parts box
(1) Remove the service panel. (Refer to procedure 1)
(2) Remove the top panel. (Refer to procedure 1)
(3) Disconnect the indoor/outdoor connecting wire and
power supply wire from terminal block.
(4) Disconnect the connectors of CNF1, CNF2, 63HS, LEV-
A, LEV-B and LEV-C on the controller circuit board.
<Symbols on the board>
• CNF1, CNF2: Fan motor
• 63HS: Pressure Sensor
• LEV-A, LEV-B, LEV-C: LEV-A, LEV-B, LEV-C
Remove the lead wires of LEV and 63HS from clamp.
Disconnect the pipe-side connections of the following parts.
• Thermistor <Liquid>(TH3)
• Thermistor <Discharge>(TH4)
• Thermistor <2-Phase pipe>(TH6)
• Thermistor <Ambient>(TH7)
• Thermistor <Suction> (TH32)
• Thermistor <Comp. surface> (TH33)
• Thermistor <Plate HEX liquid> (TH34)
• High pressure switch (63H)
• 4-way valve coil (21S4)
(5) Disengage the terminal cover from the hook to remove it.
(6) Remove the fixing screws of the 4-way valve to discon-
nect the compressor lead wire.
(7) Remove the sensor holder from the rear guard on back
of the unit.
(8) 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 (PUZ-HWM140V)
Controller circuit board
Terminal
block (TB1)
Clamp
Terminal
block (TB2)
OCH748
Photo 4 (PUZ-HWM140Y)
Noise filter circuit
board (N.F.)
Terminal
block (TB1)
Photo 6
Hook (right)
Hooks (left)
Electrical parts
Photo 7
box fixing screws
Terminal
cover
69
PHOTOS/FIGURES
Controller circuit
board (C.B.)
Terminal
block (TB2)
Electrical
parts box
Electrical parts
box fixing
screws
Clamp