Removing The Electrical Parts Box; Removing The Thermistor - Mitsubishi Electric PUZ-ZM35VKA Service Manual

OPERATING PROCEDURE

3. Removing the electrical parts box

(1) Remove the service panel. (See Photo 2)
(2) Remove the top panel. (See Photo 1)
(3) Remove the front panel. (See Photo 1)
(4) Remove the back panel. (See Photo 1)
(5) D isconnect the indoor/outdoor connecting wire from
terminal block.
(6) D isconnect the connector CNF1, LEV-A and LEV-B on
the controller circuit board.
<Symbols on the board>
• CNF1 : Fan motor
• LEV-A, LEV-B : LEV
(7) Disconnect the pipe-side connections of the following parts.
• 4-way valve (21S4)
• Thermistor <Liquid> (TH3)
• Thermistor <Comp. surface> (TH33)
• Thermistor <Discharge> (TH4)
• Thermistor <2-phase pipe, Ambient> (TH6/7)
• High pressure switch (63H)
(8) R emove the terminal cover and disconnect the compressor
lead wire.
(9) R emove the electrical parts box fixing screws, 1 from the
front, and 1 from the top side, and detach the electrical
parts box by pulling it upward.
4. Removing the thermistor <2-phase pipe> (TH6) and
thermistor <Liquid> (TH3)
(1) Remove the service panel. (See Photo 2)
(2) Remove the top panel. (See Photo 1)
(3) Remove the front panel. (See Photo 1)
(4) R emove the back panel fixing screws, 5 from the right and
2 from the rear side, and detach the back panel.
(See Photo 1)
(5) D isconnect the connector TH3 (white) or TH6/7 (red)
or TH33 (yellow) on the controller circuit board in the
electrical parts box.
(6) L oosen the clamp for the lead wire in the rear of the
electrical parts box.
(7) P ull out the thermistor <Liquid> (TH3) and thermistor
<2-phase pipe> (TH6) from the sensor holder.
Note: Replace the thermistor <2-phase pipe> (TH6) and
the thermistor <Ambient> (TH7) together since they
are combined.
Refer to procedure No. 5. to remove the thermistor
<Ambient> (TH7).
OCH653
Photo 5
Electrical part box
Compressor (MC)
Photo 6
Controller circuit
Electrical
board (C.B)
part box
103
PHOTOS
Electrical parts box
fixing screw
Controller circuit
board (C.B)
Terminal block
Terminal cover
Clamp
Thermistor
<2-phase pipe>
(TH6)
Thermistor
<Liquid> (TH3)