Nordic R-45, Installation And Service Manual, Page: 39 / 91

1-Nov-2021 Page 39 001200MAN-09
Routine Maintenance
MAINTENANCE SCHEDULE
Item Interval Procedure
Air Filter
6 months Inspect for dirt. Replace if necessary.
Compressor
Contactor
1 year Inspect for pitted or burned points.
Replace if necessary.
Condensate
Drain
1 year Inspect for clogs. Clean if necessary.
Control Board When heat pump
problem is suspected
Check status light for faults. Rectify problem if
alarms found. See Troubleshooting chapter.
Coaxial Heat
Exchanger
When experiencing
performance degrada-
tion that is not ex-
plained by a refrigera-
tion circuit problem or
low ground loop flow
rate
Disconnect the outdoor loop and flush heat exchang-
er with a calcium removing solution. Generally not
required for closed loop or cold water open loop sys-
tems; whenever system performance is reduced for
warm water open loop systems (unusual).
Coaxial Heat Exchanger Flushing Procedure - Open Loop
1. Isolate the heat exchanger by closing the valves in the IN and OUT ports to the heat exchanger.
2. Blow out the heat exchanger into a clean 5 gallon bucket using compressed air.
3. If a purge cart is not available, use a 5 gallon plastic bucket, a circulator and some plastic piping to create a make-
shift pump system. Connect a the inlet and outlet to the heat exchanger ports.
4. Place 2 gallons of RYDLYME or similar in the purge cart (or bucket). Circulate the fluid through the heat exchanger
for at least 2 hours (3 hours recommended).
5. Disconnect the purge system and dispose of the solution. RYDLYME is non-toxic and biodegradable and as such
can be poured down a drain.
6. Connect fresh water and a drain to the heat exchanger ports and flush the exchanger for several minutes.
7. Return the plumbing to its original configuration and open the IN and OUT valves. Operate the system and check for
improved performance.