Toshiba MMU-AP0091H service manual Replacing Compressor, Exchanging a compressor, 200

15-2. Replacing Compressor

Exchanging a compressor

When changing the compressor, extract oil from the defective compressor and based on the quality of the oil, make the decision of whether to change one or both compressors.

If oil colour ASTM is 4.0 or more, both compressors should be replaced.

CAUTION

The compressor can weigh in excess of 20kg.

One person should not attempt to lift it alone.

Removal of defective compressor

•Turn off the power supply to the defective unit.

•Remove the front panel. (M5 × 7)

•Remove the cover on the electric parts box. (M4 × 2)

•Remove the screws (M5 × 2) that fix the electric parts box to the outdoor unit.

•Remove the tabs for temporary hooking the lower part of the electric parts box.

Note) Due to the center of gravity of the electrical box, pay careful attention as the box may fall out.

•Remove the tabs from the upper part of the electric parts box and move it to the valve side.

Note) The electrical parts box may become unstable.

If it does, disconnect all cables and completely remove the electrical parts box.

•Remove the lower duct. (M4 × 4)

•Remove the sound-insulation mat.

•Remove the crank case heater.

•Remove the terminal cover of the compressor, the wiring to the compressor and the case thermostat unit.

Note) Remove the cables from the compressor side only.

Ensure the cable ends are insulated with electrical tape.

M5 screws (2 positions)

Claw for temporary hooking

Hooks

WARNING

Be aware that if oil is present when brazing a fire could occur.

•Remove the discharge pipe, suction pipe, and oil-equation pipe.

•Remove the hexagonal bolts fixing the compressor. (One side of hexagon: 13mm × 2 pcs. a compressor) Note) Only two hexagonal bolts are provided per compressor.

•Remove the compressor.

Measurement of the quantity of oil in the defective compressor

•Place the defective compressor on a scale, and use the weight to calculate the oil quantity.

Oil amount in the defective compressor:

A [cc] = (Removed compressor mass (kg) –23.5) × 1042

(Specific gravity of oil: 1042 cc/kg)

Note)

• When compressor holds no oil, mass is 23.5 kg.

Positions to be removed (3 positions)

(In case of right side)

*Left side is same as right side

Lower duct

M4 screws

Compressor/ (4 positions) Sound-insulation mat

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