Nordic ATWC Series, Installation And Service Manual, Page: 69 / 106

PRELIMINARY: 24-Sep-2021 Page 69 002536MAN-00
Compressor Replacement Procedure
1. Pump down the unit as per the Pumpdown Procedure above. If there was a compressor burn out (motor failure), the
refrigerant cannot be reused and must be disposed of according to local codes .
2. Disconnect piping.
3. Replace the compressor. Replace the liquid line filter-dryer. Always ensure nitrogen is flowing through the system
at the lowest flow rate that can be felt at the discharge during any brazing procedures to prevent soot buildup inside
the pipes.
4. Vacuum the unit as per above procedure.
5. If there was a compressor burnout:
a)
Charge the unit with new refrigerant and operate it for continuously for 2 hours. Pump down the unit and replace
the filter-dryer. Vacuum the unit as per above procedure.
b)
Charge the unit (refrigerant can be re-used) and operate it for 2-3 days. Perform an acid test. If it fails, pump
down the unit and replace the filter-dryer.
c)
Charge the unit (refrigerant can be re-used) and operate it for 2 weeks. Perform and acid test. If it fails, pump
down the unit and replace the filter-dryer.
6. Charge the unit a final time. Unit should now be clean and repeated future burn-outs can be avoided.