Compressor Replacement Procedure; Outdoor Fan Replacement Procedure - Maritime Geothermal Nordic PC Series Installation And Service Manual

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.

Outdoor Fan Replacement Procedure

1. Turn of the power to the Indoor Unit. This will ensure
that power and control signals are off in the outdoor unit.
2. Remove the two screws that hold the electrical box cover
in place and remove the cover.
3. Remove the two bolts that secure the front cover in
place.
4. Loosen the four bolts that hold the fan guard in place.
5. Swing the front cover open.
6. For the fan signal cable: remove the YELLOW wire from
the PWM terminal and remove the BLACK wire from the
GND terminal.
7. For the fan power cable: remove the
the RED wire from L2 and the
from GND.
8. Pull the cables out of the electrical box, noting the path
for installation of the new fan. Cut wire ties if necessary.
9. Remove the four fan guard bolts and remove the fan and
guard as one.
10. Installation is the reverse of removal.
ISSUE 03: 1-Oct-2021
BLUE wire from L1,
YELLOW/GREEN wire
Page 62 002291MAN-03