Mitsubishi PUMY-P60NKMU Technical & Service Manual page 111

OPERATING PROCEDURE
5. Removing the thermistor <Outdoor pipe> (TH3) and
thermistor <Compressor> (TH4)
(1) Remove the service panel. (See Photo 1)
(2) Disconnect the connectors TH3 (white) and TH4 (white)
from the multi controller board in the electrical parts box.
(See Photos 9, 10)
(3) Pull out the thermistor <Outdoor pipe> (TH3) and
thermistor <Compressor> (TH4) from the sensor holder.
6. Removing the 4-way valve coil (21S4)
(1) Remove the service panel and top panel. (See Photo 1)
(2) Remove 4-way valve solenoid coil fixing screw (M4 × 6).
(3) Remove the 4-way valve coil by sliding the coil to the front.
(4) Disconnect the connector 21S4 (green) on the multi con-
troller board in the electrical parts box.
7. Removing the 4-way valve
(1) Remove the service panel and top panel. (See Photo 1)
(2) Remove the electrical parts box (See Photos 4, 5)
(3) 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.
(4) Remove 5 right side panel fixing screws (4: rear side, 1:
right side 5 × 12) on the back of the unit and then remove
the right side panel.
(5) Remove the 4-way valve coil. (See Photo 10)
(6) Recover refrigerant.
(7) Remove the welded part of the 4-way valve.
Note 1: To recover refrigerants, do not release refrigerants
into the atmosphere.
Note 2: Remove the right side panel to remove the welded
part easily.
Note 3: When installing the 4-way valve, cover it with a wet
cloth to prevent it overheating (120 °C [248 °F] or
more), then braze the pipes so that the inside of
pipes are not oxidized.
OCH502C
PHOTOS & ILLUSTRATION
Photo 9
Compressor
(MC)
Photo 10
Thermistor
<Low pressure
saturated temp.>
(TH6)
Bypass valve
coil fixing screw
Bypass valve
coil (SV1)
Bypass valve
High pressure
switch (63H)
High pressure
sensor (63HS)
4-way valve coil
(21S4)
111
Thermistor
<Compressor>
(TH4)
Thermistor
Low pressure
<Outdoor pipe>
sensor (63LS)
(TH3)
4-way valve coil 4-way
fixing screw valve