Gree U-Match 5 Series - Clear the Pipeline; Replace the Compressor; Check the System for Leaks

GREE U-Match 5 SERIES UNIT SERVICE MANUAL
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Note:
When pouring the liquid from the separator, make sure the discharge pipe is at the lower position.Slant at
an angle not larger than 20°
Use a transparent container to collect the content inside the separator. Check its color, seal it well and return
it to the factory for inspection.
Note: If the compressor is damaged and needs to be replaced, the gas-liquid separator should also be replaced,
whether or not there are impurities in the separator or other abnormal conditions.
Confirm which parts of the system should be replaced. Make sure the pipe mouths of the damaged parts or
components are sealed by adhesive tape as soon as they are detached. Keep them in the original condition for
future analysis.
Step 7: Clear the pipeline
After confirming which parts of the system should be replaced, check the pipeline of the system. Blow
through the main pipeline with nitrogen. After clearing the pipeline, if the components are not replaced
immediately, seal the pipeline with adhesive tape to prevent the system from being contaminated by water and
impurities in the air.
Step 8: Replace the compressor
For the removal of compressor, please refer to the section: Removal of Major Components.
Step 9: Check/Replace the gas-liquid separator
Note: If a compressor is damaged and needs to be replaced, its gas-liquid separator should also be replaced.
This is to avoid the abnormal condition of the separator from affecting the safe and reliable operation of the
system.
For the removal of gas-liquid separator, please refer to the section: Removal of Major Components.
Step 10: Check the system for leaks
(1) First of all, check each welding point. Check whether the welding points are smooth and whether there is
any obvious welding hole or other abnormal condition.
(2) Next, fill high-pressure nitrogen into the system for leak detection. If it is only the outdoor unit that needs
to be repaired and the indoor unit is confirmed normal, then it’s OK to charge high-pressure nitrogen into
the outdoor unit only. Fill in the nitrogen simultaneously from the high pressure side and low pressure
side. We recommend charging the nitrogen from the big and small valves at the same time. The
pressure of nitrogen should be above 20kgf. Then use soapy water to check for leaks. Check the
welding points particularly.
(3) Finally, retain the pressure of the system. Fill high-pressure nitrogen into the system and maintain the
pressure above 25kgf. Close the big and small valves and keep the pressure of indoor and outdoor units