Mitsubishi Electric PUMY-P112VKM3 Technical & Service Manual page 153

OPERATING PROCEDURE
6. Removing the thermistor <Outdoor liquid pipe> (TH3)
and thermistor <Compressor> (TH4), thermistor <HIC
pipe> (TH2)
(1) Remove the service panel. (See Photo 1)
(2) Disconnect the connectors, TH3 (white) and TH4
(white), TH2 (black) on the outdoor multi controller cir-
cuit board in the electrical parts box.
(3) Loosen the clamp for the lead wire in the rear of the
electrical parts box.
(4) Pull out the thermistor <Outdoor liquid pipe> (TH3)
and thermistor <Compressor> (TH4) from the sensor
holder.
(See Photo 7 and 9)
7. Removing the 4-way valve coil (21S4)
(1) Remove the service panel. (See Photo 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 toward
you.
(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 Photo 1)
(2) Remove the top panel. (See Photo 1)
(3) Remove the electrical parts box. (See Photo 5)
(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 4 and 7)
(5) Remove 4 right side panel fixing screws (5 × 12) in the
rear of the unit and then remove the right side panel.
(6) Remove the 4-way valve coil. (See Photo 10)
(7) Recover refrigerant.
(8) 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.
OCH632A
Photo 9
Photo 10
153
PHOTOS
Thermistor
<Outdoor liquid pipe> (TH3)
4-way valve coil
(21S4)
4-way valve
4-way valve coil
fixing screw