Mitsubishi Electric CITY MULTI PUMY-P112VKM6 Service Manual page 109

2. Remove the top panel. (See Photo 1)
3. Disconnect the connector TH7 (red) on the outdoor multi controller circuit board in the electrical parts box.
4. Loosen the wire clamps on top of the electrical parts box. (See Photo 6)
5. Pull out the thermistor <Ambient> (TH7) from the sensor holder.
Note:
• When replacing thermistor <Ambient> (TH7), replace it together with thermistor <Suction pipe> (TH6), since they
are combined together. Refer to procedure No.4 to remove thermistor <Suction pipe> (TH6).
Photo 8
6. Removing the thermistor <Outdoor liquid pipe> (TH3), thermistor <Compressor> (TH4),
and thermistor <HIC pipe> (TH2)
1. Remove the service panel. (See Photo 1)
2. Disconnect the connectors TH3 (white), TH4 (white), and TH2 (black) on the outdoor multi controller circuit 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 liquid pipe> (TH3) and thermistor <Compressor> (TH4) from the sensor holder.
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 toward you.
4. Disconnect the connector 21S4 (green) on the outdoor multi controller 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) and 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.
9. Recover refrigerant.
10. Remove the welded part of 4-way valve.
Notes:
• Recover refrigerant without spreading it in the air.
• The welded part can be removed easily after removing the side panel (R).
• When installing the 4-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.
OCH790 _109
Lead wire of thermistor <Ambient> (TH7)
Sensor holder
Thermistor <Outdoor liquid pipe> (TH3)