Mitsubishi Electric PUHZ-W50VHA-BS Service Manual page 92

OPERATING PROCEDURE
8. Removing the 4-way valve coil (21S4), and linear expan-
sion valve coil (LEV-A, LEV-B, LEV-C)
(1) Remove the service panel. (See Photo 1)
(2) Remove the top panel. (See Photo 1)
[Removing the 4-way valve coil] (See Photo 15)
(3) Remove 4-way valve solenoid coil fixing screw (M4 × 6).
(4) Remove the 4-way valve coil by sliding the coil toward you.
(5) Disconnect the connector 21S4 (green) on the controller
circuit board in the electrical parts box.
[Removing the LEV coil] (See Photo 16)
(3) Remove the linear expansion valve coil by sliding the coil
upward.
(4) Disconnect the connectors, LEV-A (white), LEV-B (red) and
LEV-C (blue) on the controller circuit board in the electrical
parts box.
9. Removing the 4-way valve
(1) Remove the service panel. (See Photo 1)
(2) Remove the top panel. (See Photo 1)
(3) Remove 5 right side panel fixing screws (5 × 12) (4: rear of
the unit/1: right side base) and remove the right side panel.
(4) Remove the 4-way valve coil. (See Photo 15)
(5) Recover refrigerant.
(6) Remove the welded part of 4-way valve.
Note 1: Recover refrigerant without spreading it in the air.
Note 2: The welded part can be removed easily by remov-
ing the right side panel.
Note 3: When installing the 4-way valve, cover it with a
wet cloth to prevent it from heating (120°C or more),
then braze the pipes so that the inside of pipes
are not oxidized.
10. Removing LEV
(1) Remove the service panel. (See Photo 1)
(2) Remove the top panel. (See Photo 1)
(3) Remove 3 stay fixing screws (4 × 10) and remove the stay.
(4) Remove 5 right side panel fixing screws (5 × 12) (4: rear of
the unit/1: right side base) and remove the right side panel.
(5) Remove the LEV coil.
(6) Recover refrigerant.
(7) Remove the welded part of LEV.
Note 1: Recover refrigerant without spreading it in the air.
Note 2: The welded part can be removed easily by remov-
ing the right side panel.
Note 3: When installing the LEV, cover it with a wet cloth
to prevent it from heating (120°C or more), then
braze the pipes so that the inside of pipes are not
oxidized.
11. Removing the high pressure switch (63H) (See Photo 15)
and the low pressure switch (63L)
(1) Remove the service panel. (See Photo 1)
(2) Remove the top panel. (See Photo 1)
(3) Remove 5 right side panel fixing screws (5 × 12) (4: rear of
the unit/1: right side base) and remove the right side panel.
(4) Pull out the lead wire of high pressure switch and low
pressure switch.
(5) Recover refrigerant.
(6) Remove the welded part of high pressure switch and low
pressure switch.
Note 1: Recover refrigerant without spreading it in the air.
Note 2: The welded part can be removed easily by remov-
ing the right side panel.
Note 3: When installing the high pressure switch, cover it
with a wet cloth to prevent it from heating (100°C
or more), then braze the pipes so that the inside
of pipes are not oxidized.
OCH439H
PHOTOS
Photo 15
High pressure switch (63H)
4-way valve coil fixing screw
Photo 16
LEV (LEV-B)
Photo 17
Muffler
High pressure sensor (63HS)
92
4-way valve
LEV (LEV-C) LEV (LEV-A)
Heat exchanger
4-way valve
Low pressure switch (63L)