Mitsubishi Electric PUHZ-W50VHA Service Manual page 116

OPERATING PROCEDURE
8. Removing the 4-way valve coil (21S4), and LEV 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 coil fixing screw (M4 × 6).
(4) Remove the 4-way valve coil by sliding the coil toward you.
(5) Loosen the cable strap and wire clamp for lead wire on the
electrical parts box and separator.
(6) 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 LEV coil by sliding the coil upward.
(4) Loosen the wire clip or clamp for lead wire on the electrical parts box.
(5) 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 the electrical parts box. (See Photo 4, 5)
(4) Remove 3 valve bed fixing screws (4 × 10), 2 valve and
fixing screws (5 × 16) then remove the stay.
(5) Remove cover panel (front) fixing screws (2 for front/5 ×
12) to remove the cover panel (front).
(6) Remove 5 right side panel (R) fixing screws (5 × 12) (4: rear of
the unit/1: right side base) and remove the side panel (R).
(7) Recover refrigerant.
(8) 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 removing the side panel (R).
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 the electrical parts box. (See Photo 4, 5)
(4) Remove 3 valve bed fixing screws (4 × 10), 2 valve and
fixing screws (5 × 16) then remove the stay.
(5) Remove cover panel (front) fixing screws (2 for front/5 ×
12) to remove the cover panel (front).
(6) Remove 5 right side panel (R) fixing screws (5 × 12) (4: rear of
the unit/1: right side base) and remove the side panel (R).
(7) Remove the LEV coil.
(8) Recover refrigerant.
(9) 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 removing the side panel (R).
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 the electrical parts box. (See Photo 4, 5)
(4) Remove 3 valve bed fixing screws (4 × 10), 2 valve and
fixing screws (5 × 16) then remove the stay.
(5) Remove cover panel (front) fixing screws (2 for front/5 ×
12) to remove the cover panel (front).
(6) Remove 5 right side panel (R) fixing screws (5 × 12) (4:rear of the
unit/1: right side base) and remove the side panel (R).
(7) Recover refrigerant.
(8) 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 removing the side panel (R).
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.
OCH439M
PHOTOS/FIGURES
Photo 15
High pressure switch (63H) High pressure switch (63H)
4-way valve coil fi xing screw 4-way valve coil fi xing screw
Photo 16
LEV (LEV-A) LEV (LEV-A)
LEV (LEV-C) LEV (LEV-C)
LEV (LEV-B) 4-way valve Heat exchanger
Photo 17
High pressure sensor (63HS) High pressure sensor (63HS)
116
4-way valve
<R6/R7 models only>
LEV (LEV-B)
Low pressure switch (63L) Low pressure switch (63L) Low pressure switch (63L)