Mitsubishi Electric PUHZ-RP3VHA Technical & Service Manual page 73

OPERATING PROCEDURE
7. Removing the 4-way valve solenoid coil (21S4) and
linear expansion valve coil (LEV(A), LEV(B))
(1) Remove the service panel. (See figure 1.)
(2) Remove the top panel. (See figure 1.)
<Removing the 4-way valve solenoid coil>
(3) Remove 4-way valve solenoid coil fixing screw (M4
(4) Remove the 4-way valve solenoid coil by sliding the coil
toward you.
(5) Disconnect the connector 21S4 (green) on the controller
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) and LEV B (red),
on the controller board in the electrical parts box.
8. Removing the 4-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 4-way valve solenoid coil. (See photo 7.)
(6) Collect the refrigerant.
(7) Remove the welded part of 4-way valve.
Note 1: Collect refrigerant without spreading it in the air.
Note 2: The welded part can be removed easily by removing
the right side panel.
Note 3: When installing the 4-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. (See photo 7.)
(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 removing
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
6).
Linear expansion
valve coil (LEV B)
Photo 8
10) and 4 ball
16) and then
10) in the
Linear
expansion
valve coil
(LEV B)
10) and 4 ball
16) and then
10) in the
Linear expansion
valve
73
PHOTOS
Linear expansion
valve coil (LEV A)
Linear expansion
valve coil (LEV A)
4-way valve
solenoid coil
fixing screw
4-way valve
Bypass valve
solenoid coil
(SV)
4-way valve
solenoid coil
(21S4)
Linear
expansion
valve
4-way
valve