Mitsubishi Electric Mr.Slim PUHZ-ZRP35VKA Service Manual page 142

OPERATING PROCEDURE
8. Removing the 4-way valve coil (21S4), and LEV coil
(LEV(A), LEV(B)), (LEV(C): 140 only)
(1) Remove the service panel. (See Photo 1)
(2) Remove the top panel. (See Photo 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 LEV coil]
(3) Remove the LEV coil by sliding the coil upward.
(4) Disconnect the connectors, LEV A (white) and LEV B (red),
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 Photo 1)
(2) Remove the top panel. (See Photo 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 3 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. (See Photo 15)
(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 LEV
(1) Remove the service panel. (See Photo 1)
(2) Remove the top panel. (See Photo 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 3 right side panel fixing screws (5 × 12) in the
rear of the unit then remove the right side panel.
(5) Remove the LEV coil.
(6) Recover refrigerant.
(7) Remove the welded part of LEV.
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 LEV, 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)
(1) Remove the service panel. (See Photo 1)
(2) Remove the top panel. (See Photo 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.
(5) Recover refrigerant.
(6) Remove the welded part of high 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.
OCH527
Photo 15
Figure 1 (PUHZ-ZRP100-125YKA)
Valve bed
(PUHZ-ZRP140YKA)
High pressure
switch (63H)
4-way valve
coil (21S4)
Valve bed
142
PHOTOS
4-way valve
4-way valve
coil (21S4)
High pressure
switch (63H)
Thermistor
<Outdoor pipe>
(TH33)
LEV coil
(LEV A)
LEV coil
(LEV B)
Ball valve
Stop valve
LEV coil
(LEV C)
LEV coil
(LEV B)
Thermistor
<Outdoor pipe>
(TH33)
4-way valve
LEV coil
(LEV A)
Ball valve
Stop valve