Removing The Electrical Parts Box; Removing The Thermistor - Mitsubishi Electric PUHZ-SHW230YKA2 Service Manual

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 wires 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
Release the lead wires of LEV from the clamps on top of
the electrical parts box.
(5) 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> (TH34)
• High pressure switch (63H)
• Low pressure switch (63L)
• High pressure sensor (63HS)
• 4-way valve coil (21S4)
(6) Remove the terminal cover and disconnect the compres-
sor 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.
4. Removing the thermistor <2-phase pipe> (TH6)
(1) Remove the service panel. (See Photo 1)
(2) Remove the top panel. (See Photo 1)
(3) Disconnect the connectors of TH6 and TH7 (red) on the
controller circuit board in the electrical parts box.
(4) Loosen the 2 wire clamps on top of the electrical parts
box.
(5) Pull out the thermistor <2-phase pipe> (TH6) from the
sensor holder.
Note: In case of replacing thermistor <2-phase pipe>
(TH6), replace it together with thermistor <Ambient>
(TH7) since they are combined together.
Refer to No.5 to remove thermistor <Ambient>.
< YKA2R2 type >
Electrical parts box
Clamps
OCH594B
Photo 3
< YKA2/YKA2R1 type >
Controller circuit
board (C.B.)
Terminal block
(TB1)
< YKA2R2 type >
Controller circuit
board (C.B.)
Terminal block
(TB1)
Photo 4
< YKA2/YKA2R1 type >
Electrical parts box
Thermistor
<2-phase pipe> (TH6)
58
PHOTOS/FIGURES
Electrical parts box
Electrical parts box
Clamps
Electrical parts box
fixing screws
Noise filter
circuit board
(N.F.)
Terminal block
(TB2)
Electrical parts box
fixing screws
Noise filter
circuit board
(N.F.)
Terminal block
(TB2)
Thermistor
<2-phase pipe> (TH6)