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Replacing the compressor
Compressor replacement procedure
Installation
• Install the compressor in the reverse order of removing the compressor.
NOTE:
After installation, fully open the valve at bottom side of the compressor,
using a hexagonal wrench.
Vacuuming
• Connect the vacuum pump to the check joint of the discharge and
suction pipes, and operate the vacuum pump.
• Perform vacuuming until the vacuum low pressure gauge indicates
0.750 (mmHg).
Charging of refrigerant
• Add refrigerant of the same volume as the recovered refrigerant into
the check joint of the suction pipe.
2. Outdoor unit
MM-A0160HX
MM-A0160CX
Removal 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 cooling duct for electric parts box.
• Remove the crank case heater.
• Remove the sound-proof mat.
• Remove the terminal cover of the compressor, and remove all wires.
• Fully close the valve located under the compressor 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. 2 l or more oil may flow through the hose, so use a container with capacity of 2.5 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 the discharge pipe, 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 flux has been melted.
• 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.
4-way valve
(heat pump only)
Check joint
Bottom plate
for compressor
Brazed positions
to be removed
Case
bypass
pipe
Valve at bottom side
of the compressor
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