Removing The 4-Way Valve; Removing Linear Expansion Valve; Removing The High Pressure Switch; Removing The Reactor - Mitsubishi Electric PUZ-A18NHA4 Service Manual

OPERATING PROCEDURE

8. Removing the 4-way valve

(1) Remove the service panel. (See Photo 1)
(2) Remove the top panel. (See Photo 1)
(3) Remove the front panel. (See Photo 1)
(4) Remove the conduit cover and cord cover. (See Photo 2)
(5) Remove the back panel. (See Photo 1)
(6) Remove the electrical parts box. (See Photo 5)
(7) Remove the 4-way valve coil (See Photo 8)
(8) Recover refrigerant.
(9) Remove the welded part of four-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 four-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) Remove the front panel. (See Photo 1)
(4) Remove the conduit cover and cord cover. (See Photo 2)
(5) Remove the back panel. (See Photo 1)
(6) Remove the electrical parts box. (See Photo 5)
(7) Remove the linear expansion valve coil . (See Photo 10)
(8) Recover refrigerant.
(9) 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 remov-
ing the back 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.
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 the front panel. (See Photo 1)
(4) Remove the conduit cover and cord cover. (See Photo 2)
(5) Remove the back panel. (See Photo 1)
(6) Remove the electrical parts box. (See Photo 5)
(7) Pull out the lead wire of high pressure switch.
(8) Recover refrigerant.
(9) Remove the welded part of high pressure switch.
Note 1: Recover refrigerant without spreading it in the air.
Note 2: The welded part can be removed easily by
removing the back panel.
Note 3: When installing the high pressure switch, cover it
with a wet cloth to prevent it from heating (210˚F
or more), then braze the pipes so that the inside
of pipes are not oxidized.
11. Removing the reactor (ACL)
(1) Remove the service panel. (See Photo 1)
(2) Remove the top panel. (See Photo 1)
(3) Remove the front panel. (See Photo 1)
(4) Remove the back panel. (See Photo 1)
(5) Remove 3 reactor fixing screws (4 × 20) and remove the
reactor.
w The reactor is attached to the rear of the electrical parts box.
Photo 10
4-way valve coil
(21S4)
Photo 11
High pressure
switch (63H)
Charge plug
Photo 12
109
PHOTOS
4-way valve coil
4-way valve
fixing screw
Linear expansion valve
Linear expansion
valve coil (LEV-A)
Reactor fixing screws
Reactor fixing screws
Reactor
(ACL)
Electrical
parts box