Mitsubishi Electric PUHZ-HRP71VHA Service Manual page 130

OPERATING PROCEDURE
8. Removing the 4-way valve coil (21S4), and linear expan-
sion valve coil (LEV-A, LEV-B, LEV-C)
(1) Remove the service panel. (See Figure 1)
(2) Remove the top panel. (See Figure 1)
(3) Remove the electrical parts box. (See Photo 4)
[Removing the 4-way valve coil]
(4) Remove 4-way valve solenoid coil fixing screw (M4 × 6).
(5) Remove the 4-way valve coil by sliding the coil toward you.
[Removing the linear expansion valve coil]
(4) Remove the linear expansion valve coil by sliding the coil
upward.
9. Removing the 4-way valve
(1) Remove the service panel. (See Figure 1)
(2) Remove the top panel. (See Figure 1)
(3) Remove the valve bed. (See Photo 17)
(4) Remove the side panel (R) fixing screws (4 for front, 5 × 12)
in the rear of the unit then remove the side panel (R).
(5) Remove the 4-way valve coil.
(6) Recover refrigerant.
(7) Remove the welded part of 4-way valve.
Note 1: Recover refrigerant without spreading it in the air.
Note 2: The welded part can be removed easily by
removing the side panel (R).
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.
10. Removing linear expansion valve
(1) Remove the service panel. (See Figure 1)
(2) Remove the top panel. (See Figure 1)
(3) Remove the valve bed. (See Photo 17)
(4) Remove the side panel (R).
(5) Remove the linear expansion valve coil.
(6) Recover refrigerant.
(7) 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
removing the side panel (R).
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.
11. Removing the high pressure switch (63H) and the low
pressure switch (63L)
(1) Remove the service panel. (See Figure 1)
(2) Remove the top panel. (See Figure 1)
(3) Remove the side panel (R).
(4) Pull out the lead wire of high pressure switch and low
pressure switch.
(5) Recover refrigerant.
(6) Remove the welded part of high pressure switch and low
pressure switch.
Note 1: Recover refrigerant without spreading it in the air.
Note 2: The welded part can be removed easily by
removing the side panel (R).
Note 3: When installing the high pressure switch, cover it
with a wet cloth to prevent it from heating (100°C
or more), then braze the pipes so that the inside
of pipes are not oxidized.
OCH425F
Photo 14 (PUHZ-HRP100/125YHA)
Linear
expansion
valve coil
High pressure
(LEV-C)
switch (63H)
4-way valve coil
(21S4)
4-way valve coil
fixing screw
4-way valve
Figure 2 (PUHZ-HRP100/125YHA2)
LEV coil (LEV-C)
High pressure
switch (63H)
4-way
valve coil (21S4)
4-way valve
High pressure
sensor (63HS)
Terminal cover
Compressor
130
PHOTOS
Linear
expansion
Linear expansion
valve
valve coil (LEV-A)
Low pressure
Linear
switch (63L)
expansion
valve coil
Linear
(LEV-B)
expansion
valve
LEV
LEV coil (LEV-A)
Thermistor
<Ref. check> (TH33)
Bypass valve coil (SV)
(except HRP·HA2R1)
Bypass valve
(except HRP·HA2R1)
LEV
LEV coil (LEV-B)
Low pressure
switch (63L)