155
OPERATING PROCEDURE PHOTOS
6. Removing the thermistors
Thermistor <HIC> (TH2) and thermistor <Compressor>
(TH4)
(1) Remove the service panel. (See Photo 1)
(2) Disconnect the connectors, TH2 (black) and TH4 (white),
on the multi controller board in the electrical parts box.
(3)
Pull out the thermistor <HIC> (TH2) and thermistor
<Compressor> (TH4) from the sensor holder. (See Photo 9-1)
Thermistor <Outdoor pipe> (TH3)
(1) Remove the service panel. (See Photo 1)
(2) Disconnect the connector, TH3 (white), on the Multi control-
ler board in the electrical parts box.
(3) Loosen the clamp for the lead wire on the bottom of the
electrical parts box.
(4) Pull out the thermistor <Outdoor pipe> (TH3) from the sen-
sor holder. (See Photo 9-2)
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 (M4 × 6).
(3) Remove the 4-way valve coil by sliding the coil toward you.
(4) Disconnect the connector 21S4 (green) on the multi con-
troller 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), then remove the
valve bed. (See Photo 4 and 7)
(5) Remove 2 cover panel fixing screws (5 x 12), then slide the
cover panel (front) upward to remove it.
(The cover panel (front) is fixed to the cover panel (rear)
with a hook on the rear side. (See Photo 4)
(6) Remove the cover panel (rear) fixing screws (2 for right
side and 2 for rear/ 5 x 12), then slide the cover panel (rear)
upward to remove it. (See Photo 4)
(The cover panel (rear) is fixed to the side panel (R) with 2 screws.)
(7)
Remove 3 side panel (R) fixing screws (5 × 12) in the rear of the
unit, then slide the side panel (R) upward to remove it. (The side
panel (R) is fixed to the side plate with hooks on the rear side.)
(8) Remove the 4-way valve coil. (See Photo 10)
(9) Recover refrigerant.
(10)
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 248ºF (120°C)
or more, then braze the pipes so that the inside of
pipes are not oxidized.
Photo 10
4-way valve coil
(21S4)
4-way valve
Photo 9-1
4-way valve coil
fixing screw
Thermistor
<Outdoor pipe>
(TH3)
Photo 9-2
Thermistor
<Low pressure
saturated temp.>
(TH6)
Thermistor
<HIC> (TH2)
Ball valve and
stop valve fixing
screws
Thermistor
<Compressor>
(TH4)
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