Gree GMV-VQ680WM/C-X Service Manual page 346

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Step 10: Replacing compressors
Pay attention to the following items when replacing the compressors:
1) Remove the sealing rubber block before replacing the compressor and weld the
compressor and the corresponding pipeline. Nitrogen is required during the welding process.
Since the compressor suction and exhaust ports are all copper-plated steel pipes, it is
necessary to use solder with at least 5% silver. The welding gap should be 0.1~0.3mm to
prevent blocking or insufficient welding. Do not overheat the nozzles during the welding
process.
2) After the pipeline system is welded, use special foot pads and bolts to fix the
compressor to ensure the stability of the compressor during operation.
3) When the compressor is connected to the power cables, it must be connected
according to the connection condition of the unit at the factory and based on the electrical
circuit diagram. The wires of the compressor must be connected in the correct phase
sequence. In particular, make sure that the two full inverter compressors are wired correctly. If
the power lines of compressor 1 and compressor 2 are reversed, it may cause unit failure,
which may cause damage to the compressors in severe cases; (for example,
GMV-VQ615WM/C-X model, compressor 1 and compressor 2 are of the same type. If
compressor 1 and the compressor 2 power lines are reversed, the temperature sensor
package is correctly installed, and the unit may malfunction when the unit is running;)
Before replacing the compressors, make sure that the models of the compressors to be
replaced are same as the models of the new compressors. The new compressors must be
GMV6 HR DC Inverter VRF Units Service Manual
344