Mitsubishi Electric PUZ-A12NKA7 Service Manual page 116

OPERATING PROCEDURE
7. Removing the 4-way valve coil (21S4) and linear expan-
sion valve coil (LEV-A, 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 (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 linear expansion valve coil]
(3) R emove the linear expansion valve coil by sliding the
coil upward.
(4) D isconnect 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) R emove 3 valve bed fixing screws (4 × 10), 4 ball valve
and stop valve fixing screws (5 × 16), then remove the
valve bed.
(4) R emove 4 right side panel fixing screws (5 × 12) in the
rear of the unit and then remove the right side panel.
(5) Remove the 4-way valve coil. (See Photo 8)
(6) Recover refrigerant.
(7) 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 4-way valve, cover it with
a wet cloth to prevent it from heating (250˚F or
more), then braze the pipes so that the inside
of pipes are not oxidized.
9. Removing linear expansion valve
(1) Remove the service panel. (See Photo 1)
(2) Remove the top panel. (See Photo 1)
(3) R emove 3 valve bed fixing screws (4 × 10), 4 ball valve
and stop valve fixing screws (5 × 16), then remove the
valve bed.
(4) R emove 4 right side panel fixing screws (5 × 12) in the
rear of the unit and then remove the right side panel.
(5) Remove the linear expansion valve. (See Photo 8)
(6) Recover refrigerant.
(7) Remove the welded part of linear expansion 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 linear expansion valve,
cover it with a wet cloth to prevent it from
heating
(250˚F or more), then braze the pipes so that
the inside of pipes are not oxidized.
OCH636A
PHOTOS
Photo 8-1: PUZ model
4-way valve coil
fixing screw
4-way way
valve coil
Linear
expansion
valve
Photo 8-2: PUY model
Linear expansion
valve coil (LEV-B)
116
4-way valve
Linear expansion
valve coil (LEV-A)
Linear expansion
valve coil (LEV-B)
Linear expansion
valve coil (LEV-A)
Linear expansion
valve