Mitsubishi Electric PUMY-P36NKMU2-BS Technical & Service Manual page 138

OPERATING PROCEDURE
6. Removing the thermistor <Outdoor liquid pipe> (TH3)
and thermistor <Compressor> (TH4), thermistor <Hic
pipe> (TH2)
(1) Remove the service panel. (See Figure 1)
(2) Disconnect the connectors, TH3 (white) and TH4 (white),
TH2 (black) on the outdoor multi controller circuit board
in the electrical parts box.
(3) Loosen the clamp for the lead wire in the rear of the elec-
trical parts box. (See Photo 5)
(4) Pull out the thermistor <Outdoor liquid pipe> (TH3) and
thermistor <Compressor> (TH4) from the sensor holder.
(See Photo 6 and 8)
7. Removing the 4-way valve coil (21S4)
(1) Remove the service panel. (See Figure 1)
[Removing the 4-way valve coil]
(2) Remove 4-way valve coil fixing screw (M5 × 7).
(3) Remove the 4-way valve coil by sliding the coil to the
right side.
(4) Disconnect the connector 21S4 (green) on the outdoor
multi controller circuit board in the electrical parts box.
8. Removing the 4-way valve
(1) Remove the service panel. (See Figure 1)
(2) Remove the top panel. (See Figure 1)
(3) Remove the electrical parts box. (See Photo 4)
(4) Remove 3 valve bed fixing screws (4 × 10) and 4 ball
valve and stop valve fixing screws (5 × 16) and then
remove the valve bed. (See Photo 3 and 6)
(5) Remove 2 cover panel fixing screws (5 x 12), then slide
the cover panel (front) upward to remove it.
(The cover panel (front) is fixed to the cover panel (rear)
with a hook on the rear side.) (See Photo 3)
(6) Remove the cover panel (rear) fixing screws (2 for right
side and 2 for rear/ 5 x 12), then slide the cover panel
(rear) upward to remove it. (See Photo 3)
(The cover panel (rear) is fixed to the side panel (R) with
2 screws.)
(7) Remove 3 side panel (R) fixing screws (5 × 12) in the
rear of the unit, then slide the side panel (R) upward to
remove it. (The side panel (R) is fixed to the side plate
with hooks on the rear side.)
(8) Remove the 4-way valve coil. (See Photo 9)
(9) Recover refrigerant.
(10) 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 side panel (R).
Note 3: When installing the four-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.
OCH695B
PHOTOS/FIGURES
Photo 8
Thermistor
<Outdoor liquid pipe> (TH3)
Photo 9
4-way valve coil (21S4)
4-way valve coil
fixing screw
138
4-way valve