Mitsubishi Electric PUMY-P112VKM1 Service Manual page 151

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 circuit board in
the electrical parts box.
(3) Loosen the clamp for the lead wire in the rear of the electri-
cal 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 remov-
ing 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.
OCH576
Photo 9
Photo 10
151
PHOTOS
Thermistor
<Outdoor liquid pipe> (TH3)
4-way valve coil
(21S4)
4-way valve
4-way valve coil
fixing screw