Process For Replacing A Compressor On Field - Lennox eCOMFORT R32 GAC 035S Installation, Operating And Maintenance Manual

4.- MAINTENANCE
4.4.- PROCESS FOR REPLACING A COMPRESSOR ON THE FIELD
When servicing these units, replacing the compressors is one of the most critical procedures. It should be done following this process:
1.- Unweld the discharge and suction lines of the refrigeration circuit.
2.- Unscrew the screws of the compressor rails.
3.- Slide the rails of the compressors out of the unit.
4.- Replace the compressor.
5.- Slide again the rails inside the unit and fix the rails.
When replacing an A2L refrigerant compressor, the oil must be drained from the compressor and the compressor must be flushed with
dry nitrogen. DO NOT close the ends with plugs.
WARNING: Air/refrigerant mixture A2L: Fire hazard. Use a suitable recovery unit and recycling bottles also to
dispose of the oil, as the A2L refrigerant can still dissolve in the oil. For systems using flammable A2L refrigerant,
it is mandatory to purge oxygen-free nitrogen through the piping during the brazing process.
CAUTION: Inadequate lubrication: Destruction of bearings. Change the accumulator after replacing a compressor
with a burned out motor. The accumulator oil return hole or screen may be clogged with debris or may be
clogged. This will result in a lack of oil to the new compressor and a second failure. Completely remove the
refrigerant and oil from the replaced compressor.
During the execution of these compressor change tasks in the field, the following recommendations must be followed:
- Continuously check if the ambient atmosphere is flammable. If a flammable atmosphere is detected, ensure a
adequate ventilation of the work space and immediately cut off the power supply.
- Resume work after the atmosphere is no longer dangerous.
- Recover the refrigerant from the refrigeration circuit using a suitable recovery unit. During this action, the
compressor crankcase heater could be activated; deactivate immediately in case an atmosphere is detected
flammable.
- Recover at an absolute pressure of 3 mbar or less. To obtain the best results and also recover the
refrigerant dissolved in the oil, run the recovery unit two or three times as needed.
- Open the system with a cutting tool and flush the entire system with dry, oxygen-free nitrogen.
- Disassemble the compressor with a cutting tool. Properly drain and recover compressor oil.
Flush the compressor again with dry nitrogen for a few minutes.
- If it is necessary to return a compressor to the manufacturer for analysis, it must be returned without oil and with the
connections open. Do not close the connections with plugs.
- Collect and secure the oil properly. Provide information on the amount of oil drained from the compressor
and its color.
- Dispose of the oil in accordance with local rules and regulations.
Installation manual / eCOMFORT R32-MIL166E-0222 - 09/2022
1
3
2
• 81 •