Mitsubishi Electric PUZ-WM50VHA Service Manual page 83

OPERATING PROCEDURE
11. Removing the 4-way valve coil (21S4), LEV coil (LEV-A,
LEV-B), lead wires for high pressure switch
(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.
12. Removing the 4-way valve, LEV (LEV-A, LEV-B), high
pressure switch and 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 high pressure switch]
(6) Disconnect the lead wire from the high pressure switch.
(7) Loosen the pressure switch fixed to the pipe with a band
and rubber mount.
(8) Remove the welded part of high pressure switch (1 posi-
tion) to remove the pressure switch.
[Removing the pressure sensor]
(6) Loosen the pressure sensor fixed to the pipe with a band
and rubber mount.
(7) Remove the welded part of pressure sensor (1 position)
to remove the high pressure sensor.
Note 1: Drain the 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
• Pressure sensor, 100°C or more
OCH727
PHOTOS/FIGURES
Photo 11
4-way valve coil
fixing screw
High pressure
switch
LEV
LEV coil
(LEV-B)
LEV coil
(LEV-A)
83
4-way valve
4-way valve coil
Pressure sensor