Mitsubishi Electric PUMY-P112VKM1 Service Manual page 152

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 controller
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 remov-
ing the right side panel.
Note3: When installing the bypass 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 pres-
sure 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 pres-
sure 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 remov-
ing 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 controller
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 remov-
ing 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 electrical 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.
OCH576
Photo 11
Bypass valve
coil fixing screw
High pressure
switch (63H)
Photo 12
Electronic expansion
Low pressure
valve coil (LEV-A)
sensor (63LS)
152
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
expansion valve