Service manual

Replacing the Compressor
Compressor Replacement Procedure
135
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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
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, 4-way valve, 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 or more oil may flow through the hose, so use a
container with capacity of 2.5 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
Check joint
Brazed positions to
be removed
Valve at bottom side
of the compressor
Bottom plate
for compressor
Case
bypass
pipe