115
OPERATING PROCEDURE
PHOTOS
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)
[Removing the 4-way valve coil]
(3) Remove 4-way valve solenoid 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 connectors, LEV-A (white), LEV-B (red) and
LEV-C(blue) on the controller circuit board in the electrical
parts box.
9. 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) and 4 ball
valve and stop valve fixing screws (5 × 16) then remove
the valve bed.
(4) Remove 4 right side panel fixing screws (5 × 12) in the
rear of the unit then remove the right side panel.
(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 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.
10. 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 × 10) and 4 ball
valve and stop valve fixing screws (5 × 16) then remove
the valve bed.
(4) Remove 4 right side panel fixing screws (5 × 12) 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.
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 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 3 right side panel fixing screws (5 × 12) in the
rear of the unit and remove the right side panel.
(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 right side panel.
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.
4-way valve coil
(21S4)
Photo 14 (PUHZ-HRP100/125YHA)
4-way valve
Linear
expansion
valve coil
(LEV-C)
Linear
expansion
valve coil
(LEV-B)
4-way valve coil
fixing screw
Linear expansion
valve coil (LEV-A)
Linear
expansion
valve
Linear
expansion
valve
Low pressure
switch (63L)
High pressure
switch (63H)
Figure 2 (PUHZ-HRP100/125YHA2)
LEV coil (LEV-C)
LEV
LEV coil (LEV-A)
Thermistor
<outdoor pipe> (TH33)
Bypass valve coil (SV)
(except HRP·HA2R1)
Bypass valve
(except HRP·HA2R1)
LEV
LEV coil (LEV-B)
Low pressure
switch (63L)
High pressure
switch (63L)
4-way
valve coil (21S4)
4-way valve
Pressure
sensor (63HS)
OCH425D
