Removing The 4-Way Valve Coil; Removing The Lev Coil - Mitsubishi Electric PUHZ-SW75VHA Service Manual

OPERATING PROCEDURE
7. Removing the 4-way valve coil (21S4), and LEV coil
(LEV(A), LEV(B))
(1) Remove the service panel. (See Photo 1)
(2) Remove the top panel. (See Photo 1)

[Removing the 4-way valve coil]

(3) Remove 4-way valve coil fixing screw (M5 × 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]

(3) Remove the LEV coil by sliding the coil upward.
(4) Disconnect the connectors, LEV A (white) and LEV B (red),
on the controller circuit board in the electrical parts box.
8. Removing the 4-way valve
(1) Remove the service panel. (See Photo 1)
(2) Remove the top panel. (See Photo 1)
(3) Remove 3 valve bed fixing screws (4 × 10) and 4 ball
valve and stop valve fixing screws (5 × 16) then remove
the valve bed.
(4) Remove 4 right side panel fixing screws (5 × 12) in the
rear of the unit then remove the right side panel.
(5) Remove the 4-way valve coil. (See Photo 7)
(6) Recover refrigerant.
(7) Remove the welded part of 4-way valve.
9. Removing LEV
(1) Remove the service panel. (See Photo 1)
(2) Remove the top panel. (See Photo 1)
(3) Remove 3 valve bed fixing screws (4 × 10) and 4 ball
valve and stop valve fixing screws (5 × 16) then remove
the valve bed.
(4) Remove 4 right side panel fixing screws (5 × 12) in the
rear of the unit then remove the right side panel.
(5) Remove the LEV. (See Photo 7)
(6) Recover refrigerant.
(7) Remove the welded part of LEV.
10. Removing the high pressure switch (63H)
(1) Remove the service panel. (See Photo 1)
(2) Remove the top panel. (See Photo 1)
(3) Remove 3 right side panel fixing screws (5 × 12) in the
rear of the unit and remove the right side panel.
(4) Pull out the lead wire of high pressure switch.
(5) Recover refrigerant.
(6) Remove the welded part of high pressure switch.
OCH533A
PHOTOS
Photo 7
4-way valve coil
(21S4)
4-way valve coil
fixing screw
Charge plug
(Low pressure)
Photo 8
LEV coil
High pressure switch (63H)
(LEV B)
LEV
Note 1: Recover refrigerant without spreading it in
the air.
Note 2: The welded part can be removed easily by
removing the right side panel.
Note 3: When installing the 4-way valve and 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.
Note 4: 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.
72
LEV
LEV coil
(LEV A)
4-way valve
LEV
LEV coil
(LEV B)
4-way valve