GREE Photovoltaic Direct-driven Inverter Multi VRF Units
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Step 9: Replace the compressor
Cautions on replacement of compressors:
1) Before replacing a new compressor, remove the sealing rubbers and weld the compressor with
corresponding pipes. During welding, charge nitrogen into the pipes. Because the gas inlet and outlet
pipes are made of copper plated steels, you need to prepare special welding rods that contain 5% or
more silver. Welding clearance should be controlled within 0.1~0.3mm in order to avoid blockage or
loose welding. During welding, make sure pipe openings are not over-heated.
2) After the pipeline is welded, use special supports and bolts to secure the compressor. This is for
ensuring stability of the compressor during running.
3) Power lines of the compressor should be wired following the way that they are wired before
leaving the factory. You can refer to wiring diagram of the unit. Phase sequence error and inverse
connection of compressor wires are forbidden.
Install an inverter compressor:
Caution
Make sure compressor is wired exactly the same as it was wired before leaving the factory.
Step 10: Check/Replace gas liquid separator
※Note: If there is a faulty compressor that needs replacement, the gas liquid separator must be
replaced as well. This is to avoid abnormality from happening inside the gas liquid separator and
affecting system safety and reliability.
Put the gas liquid separator on a chassis and connect the inlet and outlet pipes of gas separator.
Then connect the pipe to a nitrogen source. The position for connecting nitrogen can be determined
based on actual situation. For example, you can add a bypass interface or directly connect the nitrogen
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