Mitsubishi Electric PUHZ-W50VHA-BS Service Manual page 93

OPERATING PROCEDURE
12. Removing high pressure sensor (63HS)
(1) Remove the service panel. (See Photo 1)
(2) Remove the top panel. (See Photo 1)
(3) Pull out the lead wire of high pressure sensor.
(4) Remove the 4-way valve coil. (See Photo 15)
(5) Recover refrigerant.
(6) Remove the welded part of 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 sensor, make
sure to 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.
13. Removing the plate heat exchanger
(1) Remove the service panel. (See Photo 1)
(2) Remove the top panel. (See Photo 1)
(3) Remove 2 screws (5 × 12) and remove the front cover panel.
(4) Remove the electrical parts box. (See Photo 4, 5)
(5) Remove 3 screws (4 × 10) and remove the stay.
(6) Remove 5 screw (5 × 12) (4: rear of the unit/1: right side
base) and remove the right side panel.
(7) Recover the refrigerant
(8) Remove 2 welded pipes of plate heat exchanger inlet and
outlet.
(9) Remove 3 plate heat exchanger fixing screws (4 × 10),
then remove the plate heat exchanger.
Note 1: Recover refrigerant without letting it out in the air.
Note 2: Before removing the thermistor <Inlet water> (TH32),
recover water in the plate heat exchanger.
OCH439H
Photo 18
Muffler
High pressure sensor (63HS)
Photo 19
Plate heat
exchanger
Plate heat exchanger
fixing screw
93
PHOTOS
Low pressure switch (63L)
Heat exchanger
Plate heat exchanger
fixing screw