OPERATING PROCEDURE
PHOTOS & ILLUSTRATION
44
8. Removing the solenoid valve coil <4-way valve> (21S4)
linear expansion valve coil (LEV (A), LEV (B)) and solenoid
valve coil <Bypass valve> (SV)
(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 solenoid valve coil <4-way valve> ]
(4) Remove solenoid valve coil <4-way valve> fixing screw
(M4 × 6).
(5) Remove the solenoid valve coil <4-way valve>.
(6) Disconnect the connector 21S4 (green) on the controller
circuit board.
[Removing the linear expansion valve coil]
(4) Remove the linear expansion valve coil by sliding the coil
upward.
(5) Disconnect the connectors, LEV A (white) and LEV B (red),
on the controller circuit board.
[Removing the solenoid valve coil <Bypass valve>]
(4) Remove the solenoid valve coil <Bypass valve> fixing
screw (M4 × 6).
(5) Remove the solenoid valve coil <Bypass valve> by sliding
the coil upward.
(6) Disconnect the connector SV2 (blue) on the controller cir-
cuit board.
9. 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 3 stay fixing screws (4 × 10) and remove the stay.
(5) Remove 3 right side panel fixing screw (5 × 10) in the rear
of the unit and remove the right side panel.
(6) Remove the solenoid valve coil <4-way valve>.
(See Photo 9.)
(7) Recover refrigerant.
(8) Remove the welded part of 4-way valve.
Note 1: Recover refrigerant without letting it out in the air.
Note 2: The welded part can be removed easily by remov-
ing the right side panel.
Note 3: When installing the 4-way valve, make sure to
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.
10. 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 3 stay fixing screws (4 × 10) and remove the stay.
(5) Remove 3 right side panel fixing screw (5 × 10) in the rear
of the unit and then remove the right side panel.
(6) Remove the linear expansion valve.
(7) Recover refrigerant.
(8) 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 (120 °C
or more), then braze the pipes so that the inside of
pipes are not oxidized.
Photo 9
Photo 10
4-way
valve coil (21S4)
4-way valve
Bypass
valve coil (SV)
LEV-A
LEV-B
High pressure
switch
Bypass valve
4-way
valve coil (21S4)
Stay fixing
screw
Stay fixing screw
4-way
valve
Stay fixing
screw
