Mitsubishi Electric PUHZ-P100VHA.UK Service Manual page 91

OPERATING PROCEDURE
7. Removing the solenoid valve coil <Four-way valve> (21S4),
linear expansion valve coil (LEV(A)) and
solenoid valve coil <Bypass valve> (SV)
(1) Remove the service panel. (See figure 1.)
(2) Remove the top panel. (See figure 1.)
(3) Remove the electrical parts box. (See photo 3.)
[Removing the solenoid valve coil <Four-way valve>]
(4) Remove solenoid valve coil <Four-way valve> fixing screw
(M4 6).
(5) Remove the solenoid valve coil <Four-way valve> by
sliding the coil toward you.
(6) Disconnect the connector 21S4 (green) on the controller
board in the electrical parts box.
[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), on the controller
circuit board in the electrical parts box.
[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
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 the electrical parts box. (See photo 3.)
(4) Remove 3 valve bed fixing screws (4
valve and stop valve fixing screws (5
remove the valve bed.
(5) Remove 3 right side panel fixing screw (5
rear of the unit and then remove the right side panel.
(6) Remove the solenoid valve coil <Four-way valve>.
(See photo 7.)
(7) Collect the refrigerant.
(8) 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 oxi-
dized.
9. Removing the linear expansion valve
(1) Remove the service panel. (See figure 1.)
(2) Remove the top panel. (See figure 1.)
(3) Remove the electrical parts box. (See photo 3.)
(4) Remove 3 valve bed fixing screws (4
valve and stop valve fixing screws (5
remove the valve bed.
(5) Remove 3 right side panel fixing screw (5
rear of the unit and then remove the right side panel.
(6) Remove the linear expansion valve. (See photo 7.)
(7) Collect the refrigerant.
(8) 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 pipes are not oxidized.
Photo 7
Solenoid
valve coil
<Bypass valve>
fixing screw
Solenoid
valve coil
<Bypass valve>
(SV)
Photo 8
10) and 4 ball
16) and then
10) in the
Linear
expansion
valve
10) and 4 ball
16) and then
10) in the
91
PHOTOS
solenoid
Linear expansion
valve coil
valve coil (LEV A)
<Four-way valve>
fixing screw
Linear expansion
Four-way valve
valve coil (LEV A)
Four-way valve
solenoid
valve coil
<Four-way valve>
(21S4)