Mitsubishi Electric SUZ-KA24NAHZ Service Manual page 97

OPERATING PROCEDURE
7. Removing the 4-way valve coil (21S4), and linear expansion
valve coil (LEV-A, LEV-B, LEV-C)
(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)
[Removing the 4-way valve coil]
(4) Remove 4-way valve coil fixing screw (M5 × 7).
(5) Remove the 4-way valve coil by sliding the coil toward you.
Loosen the clamp for lead wires on the separator.
Loosen fasteners and the cable strap for lead wires in the
electrical parts box.
(6) Disconnect the connector 21S4 (green) on the controller
circuit board in the electrical parts box.
[Removing the linear expansion valve coil]
(4) Loosen a fastener for lead wires.
(5) Remove the linear expansion valve coil by sliding the coil
upward.
Loosen the clamp for lead wires on the separator.
Loosen a fastener for lead wires in the electrical parts box.
(6) Disconnect the connectors, LEV-A (white), LEV-B (red)
and LEV-C(blue) on the controller circuit board in the elec-
trical 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 the electrical parts box. (See Photo 4)
(4) Remove 2 cover panel front fixing screws (5 × 12) and
remove the cover panel front. (See Photo 1)
(5) Remove 2 cover panel rear fixing screws (5 × 12) and
remove the cover panel rear.
(6) Remove 3 valve bed fixing screws (4 × 10) and 4 ball valve and
stop valve fixing screws (5 × 16) then remove the valve bed.
(7) Remove 3 side panel (R) fixing screws (5 × 12) in the rear
of the unit then remove the side panel (R).
(8) Remove the 4-way valve coil.
(9) Recover refrigerant.
(10) Remove the welded part of 4-way valve.
Note : When installing the 4-way valve, cover it with a wet
cloth to prevent it from heating (250°F [120°C] 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 electrical parts box. (See Photo 4)
(4) Remove the cover panel front. (Refer to procedure 8)
(5) Remove the cover panel rear. (Refer to procedure 8)
(6) Remove the valve bed. (Refer to procedure 8)
(7) Remove the side panel (R). (Refer to procedure 8)
(8) Remove the linear expansion valve coil.
(9) Recover refrigerant.
(10) Remove the welded part of linear expansion valve.
Note : When installing the linear expansion valve, cover it
with a wet cloth to prevent it from heating (250°F
[120°C] or more), then braze the pipes so that the
inside of pipes are not oxidized.
OCH754A
PHOTOS/FIGURES
Photo 9
High pressure
switch (63H)
4-way valve coil fixing screw
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 electrical parts box. (See Photo 4)
(4) Remove the cover panel front.
(5) Remove the cover panel rear.
(6) Remove the valve bed. (Refer to procedure 8)
(7) Remove the side panel (R). (Refer to procedure 8)
(8) Pull out the lead wire of high pressure switch (63H).
(9) Recover refrigerant.
(10) Remove the welded part of high pressure
switch (63H).
Note : When installing the high pressure switch,
cover it with a wet cloth to prevent it from
heating (210°F [100°C] or more), then
braze the pipes so that the inside of pipes
are not oxidized.
97
LEV coil LEV coil
(LEV-C) (LEV-A)
Linear expansion valves
4-way valve
LEV coil (LEV-B)
Linear expansion valve
4-way valve coil (21S4)