Mitsubishi Electric PUHZ-P200YHA Service Manual page 91

OPERATING PROCEDURE
7. Removing the 4-way valve coil (21S4) and linear expan-
sion valve coil (LEV(A))
(1) Remove the service panel. (See Figure 1.)
(2) Remove the top panel. (See Figure 1.)
[Removing the 4-way valve coil]
(3) Remove 4-way valve coil fixing screw (M4 × 6).
(4) Remove the 4-way valve coil 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 connector, LEV A (white) on the controller
circuit 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 × 10), 4 ball
valve and stop valve fixing screws (5 × 16) then
remove the valve bed.
(4) Remove 4 right side panel fixing screws (5 × 10) in the
rear of the unit then remove the right side panel.
(5) Remove the 4-way valve coil. (See Photo 7.)
(6) Recover refrigerant.
(7) Remove the welded part of 4-way valve.
9. Removing the 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 × 10), 4 ball
valve and stop valve fixing screws (5 × 16) then
remove the valve bed.
(4) Remove 4 right side panel fixing screws (5 × 10) in the
rear of the unit then remove the right side panel.
(5) Remove the linear expansion valve coil.
(6) Recover refrigerant.
(7) Remove the welded part of linear expansion valve.
10. Removing the high pressure switch (63H)
(1) Remove the service panel. (See Figure 1.)
(2) Remove the top panel. (See Figure 1.)
(3) Remove 3 right side panel fixing screws (5 × 10) in the
rear of the unit and remove the right side panel.
(4) Pull out the lead wire of high pressure switch.
(5) Recover refrigerant.
(6) Remove the welded part of high pressure switch.
Photo 7
High pressure switch
4-way valve coil fixing screw
Photo 8
Note 1: Recover 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 parts of refrigerant cir-
cuit, 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.
91
PHOTOS
4-way valve coil
Linear expansion valve
4-way valve
Linear expansion valve coil (LEV-A)
Linear expansion valve