Mitsubishi Electric PUMY-P112VKM3 Technical & Service Manual page 149

OPERATING PROCEDURE
9. Removing bypass valve coil (SV1) and bypass valve
(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) Remove the bypass valve coil fixing screw (M4 × 6).
(5) Remove the bypass valve coil by sliding the coil
upward.
(6) Disconnect the connector SV1 (gray) on the multi con-
troller circuit board in the electrical parts box.
(7) Remove the electrical parts box. (See photo 5)
(8) Recover refrigerant.
(9) Remove the welded part of bypass 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.
Note3: 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 the high pressure switch (63H) and high
pressure sensor (63HS)
(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 o 12) in the
rear of the unit and remove the right side panel.
(4) Pull out the lead wire of high pressure switch and high
pressure sensor.
(5) Remove the electrical parts box. (See Photo 5)
(6) Recover refrigerant.
(7) Remove the welded part of high pressure switch and
high pressure sensor.
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 and
high pressure sensor, cover them with a wet
cloth to prevent them from heating (100°C or
more), then braze the pipes so that the inside
of pipes are not oxidized.
11. Removing the low pressure sensor (63LS)
(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 o 12) in the
rear of the unit and remove the right side panel.
(4) Disconnect the connector 63LS (blue) on the multi con-
troller circuit board in the electrical parts box.
(5) Remove the electrical parts box. (See Photo 5)
(6) Recover refrigerant.
(7) Remove the welded part of low pressure sensor.
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 low pressure sensor,
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.
12. Removing electronic expansion valve (LEV-A, LEV-B)
(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 o 12) in the
rear of the unit and remove the right side panel.
(4) Remove the electrical expansion valve coil. (See Photo 11,12)
(5) Remove the electrical parts box. (See Photo 5)
(6) Recover refrigerant.
(7) Remove the welded part of electrical expansion valve.
OCH632A
Photo 11
Bypass valve
coil fixing screw
High pressure
switch (63H)
Photo 12
Low pressure
sensor (63LS)
149
PHOTOS
Electronic expansion
valve coil (LEV-B)
Bypass valve
coil (SV1)
Electronic
expansion
valve
Bypass valve
Low pressure
sensor (63LS)
High pressure
sensor (63HS)
Electronic expan-
Electronic expan-
sion valve
sion valve coil
(LEV-A)