Mitsubishi PUMY-P100YHM Technical & Service Manual page 83

OPERATING PROCEDURE
6. Removing the thermistor <Outdoor pipe> (TH3) and
thermistor <Discharge> (TH4)
(1) Remove the service panel. (See figure 1.)
(2) Disconnect the connectors, TH3 (white) and TH4 (white),
on the Multi controller 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 pipe> (TH3) and
thermistor <Discharge> (TH4) from the sensor holder.
7. Removing the 4-way valve coil (21S4)
(1) Remove the service panel. (See figure 1.)
(2) Remove the top panel. (See figure 1.)
[Removing the 4-way valve coil]
(3) Remove 4-way valve coil fixing screw
(M5 × 6 for 100-140YHM,
M4 × 6 for 100-140YHM
(4) Remove the 4-way valve coil by sliding the coil toward you.
(5) Disconnect the connector 21S4 (green) on the Multi
controller 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 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 4 right side panel fixing screws (5 × 10) in the
rear of the unit and then remove the right side panel.
(5) Remove the 4-way valve coil.
(See photo 8.)
(6) Recover refrigerant.
(7) 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 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.
/YHMA(-BS)).
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PHOTOS
Photo 7
Compressor
(MC)
Photo 8
4-way valve coil
(21S4)
4-way valve coil
fixing screw
Thermistor
<Outdoor pipe>
(TH3)
Thermistor
<Discharge>
(TH4)
4-way valve
Thermistor
<Low pressure
saturated temp.>
(TH6)