Mitsubishi Electric PUHZ-P100VHA2 Service Manual page 129

OPERATING PROCEDURE
7. Removing the 4-way valve coil (21S4), LEV coil (LEV(A))
(1) Remove the service panel. (See Figure 1)
(2) Remove the top panel. (See Figure 1)
(3) Remove the electrical parts box. (Refer to procedure 3)
[Removing the 4-way valve coil]
(4) Remove the 4-way valve coil fixing screw (M5 × 6).
(5) Remove the 4-way valve by sliding the coil toward you.
(6) Disconnect the connector 21S4 (green) on the controller
board in the electrical parts box.
[Removing the linear expansion valve coil]
(4) Remove the LEV coil by sliding the coil upward.
(5) Disconnect the connectors, LEV A (white), on the controller
circuit board in the electrical parts box.
8. Removing the 4-way valve
(1) Remove the service panel. (See Figure 1)
(2) Remove the top panel. (See Figure 1)
(3) Remove the electrical parts box. (Refer to procedure 3)
(4) Remove 3 valve bed fixing screws (4 × 10) and 4 ball
valve and stop valve fixing screws (5 × 16) and then
remove the valve bed.
(5) Remove 3 right side panel fixing screws (5 × 12) in the
rear of the unit and then remove the right side panel.
(6) Remove the 4-way valve. (See Photo 8)
(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 right side panel.
Note 3: When installing the four-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.
9. Removing the LEV
(1) Remove the service panel. (See Figure 1)
(2) Remove the top panel. (See Figure 1)
(3) Remove the electrical parts box. (Refer to procedure 3)
(4) Remove 3 valve bed fixing screws (4 × 10) and 4 ball
valve and stop valve fixing screws (5 × 16) and then
remove the valve bed.
(5) Remove 3 right side panel fixing screws (5 × 12) in the
rear of the unit and then remove the right side panel.
(6) Remove the LEV coil. (See Photo 8)
(7) Recover refrigerant.
(8) 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 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.
OCH415F
Photo 8
Photo 9
LEV
129
PHOTOS
4-way valve coil
LEV coil (LEV A)
fixing screw
4-way valve
LEV coil (LEV A)
4-way valve
4-way valve
coil (21S4)