Mitsubishi Electric PUMY-P100VHMB Service Manual page 93

OPERATING PROCEDURE
6. Removing the thermistor <Outdoor pipe> (TH3) and ther-
mistor <Discharge/Compressor> (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 electri-
cal parts box.
(4) Pull out the thermistor <Outdoor pipe> (TH3) and thermistor
<Discharge/Compressor> (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 (M4 × 6).
(4) Remove the 4-way valve coil by sliding the coil toward you.
(5) Disconnect the connector 21S4 (green) on the Multi control-
ler 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 screw (5 × 12) 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 four-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.
Photo 7
*For VHMBR2(-BS)
Thermistor
<Compressor> (TH4)
Photo 8
4-way valve coil (21S4)
4-way valve coil
fixing screw
93
PHOTOS
Thermistor
<Outdoor pipe>
(TH3)
Thermistor
Compressor
<Discharge> (TH4)
(MC)
4-way valve
Thermistor
<Low pressure
saturated temp.>
(TH6)