MXZ-SM48NAMHZ Service Manual

162
OCH789
OPERATING PROCEDURE PHOTOS/FIGURES
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 multi controller circuit board in the
electrical parts box.
(3) Pull out the thermistor <Outdoor liquid pipe> (TH3) and
thermistor <Compressor> (TH4) from the sensor holder.
(See Photo 7 and 9)
Photo 9
7. Removing the 4-way valve coil (21S4)
(1) Remove the service panel. (See Photo 1)
(2) Remove 4-way valve coil fixing screw (M5 × 7).
(3) Remove the 4-way valve coil by sliding the coil to the
right.
(4) Disconnect the connector 21S4 (green) on the multi con-
troller circuit board in the electrical parts box.
Photo 10
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.
(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.
Notes:
1. Recover refrigerant without spreading it in the air.
2. The welded part can be removed easily by removing
the side panel (R).
3. When installing the 4-way valve, cover it with a wet
cloth to prevent it from heating (248°F [120°C] or
more), then braze the pipes so that the inside of pipes
are not oxidized.
Thermistor
<Outdoor liquid pipe> (TH3)
4-way valve coil (21S4)
4-way valve
4-way valve coil
fixing screw