Service manual

Replacing the Compressor
Compressor Replacement Procedure
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NOTE:
Weight of the compressor is approx. 45kg.
• Remove the nuts fixing the compressor.
• Remove the compressor.
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.
[In case of removal of the compressor from the rear side]
1. Outdoor unit (Inverter and fixed-speed units)
MM-A0280HT, MM-A0280HX, MM-A0224HT, MM-A0224HX
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, 4-way valve, etc.
• Remove the rear painted panel.
• Remove the crank case heater.
(Only for fixed-speed unit)
• Remove the sound-proof mat.
• Remove the terminal cover of the compressor, and
remove all wires.
• Remove two temp. sensors for oil detection.
• 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. 7.5 or more oil may
flow through the hose, so use a container with
capacity of 8 or more.
• Apply nitrogen gas with approx. 0.02MPa from
service valve at gas side to extract oil.
(Extract oil completely.)
Sensor to detect oil
Brazed
positions
to be
removed
Compressor
Fixing metal
Oil tank