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Replacing the compressor
Compressor replacement procedure
After recovery of refrigerant is complete, turn off the power source, and replace the compressor
according to the following method.
[In case of removal of the compressor from the front side]
1. Outdoor units (Inverter and fixed-speed units)
MM-A0280HT, MM-A0224HT, MM-A0280HX, MM-A0224HX
MM-A0280CT, MM-A0224CT, MM-A0280CX, MM-A0224CX
Removing of parts
• Remove the front painted panel.
• Remove electrical parts cover.
• Disconnect all wires connected to the electric parts box.
Temp. sensor, pressure sensor, complete, 2-way valve, PMV, etc.
• Remove the electric parts box.
• Remove the isolator fixing plate. (Do not remove the pressure sensor.)
• Remove the cooling duct for the electric parts.
• Remove the crank case heater.
(Only for fixed-speed unit)
• Remove the sound-proof blanket.
• Remove the terminal cover of the compressor, and remove all wires.
• Close the valve located under the compressor fully using a
hexagonal wrench.
Extraction of oil from compressor
• Cut the case bypass located at the bottom of the compressor by
the same height as that of the suction pipe.
• Connect hose to the cut case bypass, and insert the opposite
side of the hose in the container in which oil is discharged. 7.5 l or
more oil may flow through the hose, so use a container with
capacity of 8 l or more.
• Apply nitrogen gas with approx. 0.02MPa from service valve at gas
side to extract oil.
(Extract oil completely.)
Removing of compressor
• Remove two discharge pipes, suction pipe, upper oil return piping, oil tank piping, and case bypass piping.
NOTE:
Take great care when removing the pipes with a brazing torch – if oil is remaining in the pipe, a flame may be emitted at the
moment when the flux melts.
• Loosen the flare nut at the bottom side of the compressor to remove the pipe.
• Remove the screws fixing the bottom plate for the compressor.
• Pull out the compressor with the bottom plate for the compressor.
NOTE:
Weight of the compressor is approx. 100kg.
• Remove the nuts fixing the compressor.
• Remove the compressor.
Bottom plate for
compressor
Brazed positions
to be removed
Case
bypass
pipe
Valve at bottom
side of the
compressor
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