Mitsubishi Electric PUHZ-P100VHA.UK Service Manual page 96

OPERATING PROCEDURE
7. Removing the solenoid valve coil <Four-way valve> (21S4),
and linear expansion valve coil (LEV(A))
(1) Remove the service panel. (See figure 1.)
(2) Remove the top panel. (See figure 1.)
[Removing the solenoid valve coil <Four-way valve>]
(3) Remove four-way valve solenoid coil fixing screw
(M4 6).
(4) Remove the solenoid valve coil <Four-way valve> 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) Remove the linear expansion valve coil by sliding the coil
upward.
(4) Disconnect the connectors, LEV A (white) on the controller
circuit board in the electrical parts box.
8. Removing the four-way valve
(1) Remove the service panel. (See figure 1.)
(2) Remove the top panel. (See figure 1.)
(3) Remove 3 valve bed fixing screws (4
valve and stop valve fixing screws (5
remove the valve bed.
(4) Remove 4 right side panel fixing screw (5
rear of the unit and then remove the right side panel.
(5) Remove the solenoid valve coil <Four-way valve>.
(6) Collect the refrigerant.
(7) Remove the welded part of four-way valve.
Note 1: Collect 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 (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 figure 1.)
(2) Remove the top panel. (See figure 1.)
(3) Remove 3 valve bed fixing screws (4
valve and stop valve fixing screws (5
remove the valve bed.
(4) Remove 4 right side panel fixing screw (5
rear of the unit and then remove the right side panel.
(5) Remove the linear expansion valve.
(6) Collect the refrigerant.
(7) Remove the welded part of linear expansion valve.
Note 1: Collect 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 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 pip-es are not oxidized.
Photo 7
Solenoid valve coil
<Four-way valve>
(21S4)
10) and 4 ball
16) and then
10) in the
10) and 4 ball
16) and then
10) in the
96
PHOTOS
Solenoid valve coil
<Four-way valve>
fixing screw
Four-way valve
Linear expansion
valve coil
Linear expansion
valve