Mitsubishi Electric PUHZ-W85VAA Service Manual page 67

OPERATING PROCEDURE
11. Removing the 4-way valve coil (21S4), LEV coil (LEV-A,
LEV-B), lead wires for high pressure switch, low pressure
switch, and high pressure sensor
(1) Remove the electrical parts box. (See Photo 3-1)
(2) Loosen the bands for the lead wire.
[Removing the 4-way valve coil]
(3) Remove the 4-way valve coil fixing screw (1 for front/ M5)
to remove the 4-way valve coil.
(4) Slide the 4-way valve coil forward to remove it.
[Removing the LEV coil]
(3) Loosen the lead wires fixed to the pipes with a band.
(4) Slide the LEV coil upward to remove it.
[Removing the lead wire for high pressure switch]
(3) Disconnect the lead wire from the high pressure switch.
[Removing the lead wire for low pressure switch]
(3) Loosen the lead wires fixed to the pipes with a band.
(4) Disconnect the lead wire from the low pressure switch.
[Removing the lead wire for high pressure sensor]
(3) Disconnect the lead wire from the high pressure sensor.
12. Removing the 4-way valve, LEV (LEV-A, LEV-B), high
pressure switch, low pressure switch and high pressure
sensor
(1) Remove the nozzle of plate heat exchanger for the water
piping. (See Photo 14)
(2) Remove the service panel. (See Photo 1)
(3) Recover refrigerant.
(4) Remove the electrical parts box. (See Photo 3-1)
(5) Remove the side panel (R). (See Photo 1)
[Removing the 4-way valve]
(6) Remove the 4-way valve coil.
(7) Remove the welded part of 4-way valve (4 positions) to
remove the 4-way valve.
[Removing the LEV]
(6) Remove the LEV coil.
(7) Loosen the LEV fixed to the pipe with a band and rubber
mount.
(8) Remove the welded part of LEV (2 positions) to remove the LEV.
[Removing the pressure switch]
(6) Disconnect the lead wire from the pressure switch.
(7) Loosen the pressure switch fixed to the pipe with a band
and rubber mount.
(8) Remove the welded part of pressure switch (1 position)
to remove the pressure switch.
[Removing the high pressure sensor]
(6) Disconnect the lead wire from the high pressure sensor.
(7) Loosen the high pressure sensor fixed to the pipe with a
band and rubber mount.
(8) Remove the welded part of high pressure sensor (1 posi-
tion) to remove the high pressure sensor.
Note 1: Recover water in the plate heat exchanger before
removing the water piping.
Note 2: Recover refrigerant without spreading it in the air.
Note 3: When installing the following parts, cover it with
a wet cloth to prevent it from heating as the tem-
perature below, then braze the pipes so that the
inside of pipes are not oxidized;
• 4-way valve, 120°C or more
• LEV, 120°C or more
• High pressure switch, 100°C or more
• Low pressure switch, 100°C or more
• High pressure sensor, 100°C or more
OCH681
PHOTOS/FIGURES
Photo 11
4-way valve coil
fixing screw
High pressure
switch
High pressure
sensor
LEV
LEV coil
(LEV-B)
LEV coil
(LEV-A)
67
4-way valve
4-way valve coil
Low pressure
switch