CONNECT SERIES SERVICE MANUAL
44
ENGLISH
Maintenance
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
moisture and impurities in the air.
8. Replace the compressor
• For the removal of compressor, please refer to the section: Removal of Major Components.
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 will avoid the abnormal condition of the separator from aecting the safe and reliable
operation of the system.
• For the removal of gas-liquid separator, please refer to the section: Removal of Major Components.
10. Check the system for leaks
• First of all, check each brazing point. Check whether the brazed joints are smooth and whether there is any
obvious flaws or other abnormal condition.
• 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 with nitrogen simultaneously from the high pressure side and low pressure side.
We recommend charging the nitrogen from the both service valves at the same time. Nitrogen pressure
should be greater than 150 psi. Use soapy water to check for leaks. Check the brazed joints particularly.
• Finally, pressurize the entire system. Fill high-pressure nitrogen into the system and maintain 300 psi.
Close both service valves and maintain the pressure of indoor and outdoor units for more than 12h. If the
pressure remains unchanged, then start system evacuation; otherwise, check the system for leaks again.
Temperature should be considered when judging the pressure change. If temperature changes by 2
O
F ,
pressure will change by 1-1/2 psi or so.
11. Evacuate the system and charge refrigerant
• Please refer to the section of maintenance: vacuum pumping and refrigerant charging.
12. Connect electric components
• Connect cables, compressor wires and the electric heating belt according to the signs marked before and
the wiring diagram on the cover of the electric box.
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