Mitsubishi Electric MXZ-SM72TAM-U1 Service Manual page 112

3. Removing the electrical parts box
1. Remove the service panel. (See Photo 1)
2. Remove the top panel. (See Photo 1)
3. Disconnect the connecting wire from the terminal block.
4. Remove all the following connectors from the outdoor multi controller circuit board;
<Diagram symbol in the connector housing>
• Fan motor (CNF1, CNF2)
• Thermistor <HIC pipe> (TH2)
• Thermistor <Outdoor liquid pipe> (TH3)
• Thermistor <Compressor> (TH4)
• Thermistor <Suction pipe/Ambient> (TH6/7)
• High pressure switch/Thermal protector (63H/TRS)
• High pressure sensor (63HS)
• Low pressure sensor (63LS)
• 4-way valve (21S4)
• Bypass valve (SV1)
• Oil return valve (SV3)
• Linear Expansion valves (LEV-A, LEV-B)
Pull out the disconnected wires from the electrical parts box.
5. Remove the cover panel front. (See Photo 1)
6. Remove the cover panel rear. (See Photo 1)
7. Remove the side panel R. (See Photo 1)
8. Remove the terminal cover and disconnect the compressor lead wire.
9. Remove electrical parts box fixing screws (5 × 12) and detach the electrical parts box by pulling it upward.
Photo 4
Front panel
fixing screws
(4x10)
Front panel
fixing screws (5x12)
4. Removing thermistors <Suction pipe> (TH6) and <Ambient> (TH7)
1. Remove the service panel. (See Photo 1)
2. Remove the top panel. (See Photo 1)
3. Disconnect the connectors TH6 and TH7 (red) on the outdoor multi controller circuit board in the electrical parts box.
4. Remove the cover panel front. (See Photo 1)
5. Remove the cover panel rear. (See Photo 1)
6. Remove the side panel R. (See Photo 1)
7. Remove the wire of TH7 from the clamps and clips on the buttom and the side of the electrical parts box. (See Photo 6)
8. Pull out the thermistor <Ambient> (TH7) from the sensor holder. (See Photo 7)
9. Pull out the thermistor <Suction pipe> (TH6) from the sensor holder. (See Photo 8)
Note:
• When replacing thermistor <Suction pipe> (TH6) or <Ambient> (TH7), replace them together since they are com-
bined together.
OCH800A_112
Front panel fixing Electrical
screws (5x12) parts box
Photo 5
M-NET power
circuit board
(M-NET P.B)
Multi controller
board
(MULTI.B)
Electrical
parts box
fixing screws
Valve bed
fixing screws
Terminal block
(TB1)
Valve bed
Compressor
(MC)
Terminal cover
Terminal block Terminal block
(TB3) (TB7) (TB1B)
Electrical
parts box
Electrical
parts box
fixing screws