Mitsubishi Electric PUZ-HA30NHA5 Service Manual page 97

OPERATING PROCEDURE
8. Removing the thermistor <Ref. check> (TH33)
(1) Remove the service panel. (See Figure 1)
(2) Disconnect the connector, TH33 (YE), on the controller
circuit board in the electrical parts box. (See Photo 3)
(3) Loosen the fastener and clamp for the lead wire on the
controller circuit board in the electrical parts box.
(4) Pull out the thermistor <Ref. check> (TH33) from
thermistor holder.
9. Removing the 4-way valve coil (21S4), LEV coil (LEV-A,
LEV-B, LEV-C) and lead wire for high pressure switch
(63H) and low pressure switch (63L).
(1) Remove the service panel. (See Figure 1)
(2) Remove the top panel. (See Figure 1)
(3) Remove the electrical parts box. (See Photo 3)
(4) Loosen the clamp for the lead wire on separator.
[Removing the lead wire for pressure switch]
(5) Disconnect the lead wire from the pressure switch.
[Removing the 4-way valve coil]
(5) Remove the 4-way valve coil fixing screw (1 for front/ M4)
to remove the 4-way valve coil.
(6) Slide the 4-way valve coil forward to remove it.
[Removing the LEV coil]
(5) Loosen the lead wires fixed to the pipes with bands.
(6) Slide the LEV coil upward to remove it.
10. Removing the 4-way valve, LEV (LEV-A, LEV-B, LEV-C),
high pressure switch and low pressure swich.
(1) Remove the service panel. (See Figure 1)
(2) Remove the top panel. (See Figure 1)
(3) Remove the electrical parts box. (See Photo 3)
(4) Remove the cover panel (front). (See Figure 1)
(5) Remove the cover panel (rear). (See Photo 3)
(6) Remove the valve bed. (See Photo 3)
(7) Remove the side panel (R).
(8) Recover refrigerant.
[Removing the 4-way valve]
(9) Remove the 4-way valve coil. (See Figure 2)
(10) Remove the welded part of 4-way valve (4 positions) to
remove the 4-way valve.
[Removing the LEV]
(9) Remove the LEV coil. (See Figure 2)
(10) Remove the welded part of LEV (2 positions) to remove
the LEV.
[Removing the pressure switch]
(9) Disconnect the lead wire from the pressure switch.
(10) Remove the welded part of pressure switch
(1 position) to remove the pressure switch.
Note 1: Recover refrigerant without spreading it in the
air.
Note 2: The welded part can be removed easily by
removing the side panel (R).
Note 3: When installing the following parts, cover it
with a wet cloth to prevent it from heating as
the temperature below, then braze the pipes so
that the inside of pipes are not oxidized;
• 4-way valve, 250°F [120°C] or more
• LEV, 250°F [120°C] or more
• Pressure switch, 210°F [100°C] or more
OCH607
Figure 2
LEV coil (LEV-C)
High pressure
switch (63H)
4-way
valve coil (21S4)
4-way valve coil
fixing screw
4-way valve
97
ILLUSTRATION
LEV
(Linear expansion valve)
LEV coil (LEV-A)
LEV coil
(LEV-B)
Low pressure
switch (63L)
Thermistor
<Ref. check>
(TH33)
LEV