Nordic R-09, Installation And Service Manual, Page: 30 / 60

11-May-2021 Page 30 002512MAN-01
GENERAL MAINTENANCE SCHEDULE
Item Interval Procedure
Air Filter
6 months Inspect for dirt. Replace if necessary.
Contactor
1 year Inspect for pitted or burned points. Replace if necessary.
Condensate Drain
1 year Inspect for clogs. Remove and clean if necessary.
Heat exchanger
As required* Clean as per HEAT EXHCANGER FLUSING PROCEDURE below.
*Generally not required for closed loop systems. Whenever system performance is reduced for open loop.
COAXIAL HEAT EXCHANGER FLUSHING PROCEDURE - OPEN LOOP (WELL WATER)
STEP 1 Isolate the heat exchanger by closing the valves in the IN and OUT ports to the heat exchanger.
STEP 2 Blow out the heat exchanger into a clean 5 gallon bucket using compressed air.
STEP 3 If a purge cart is not available, use a 5 gallon plastic bucket, a circulator and some plastic piping to create a
makeshift pump system. Connect a the inlet and outlet to the heat exchanger ports.*
STEP 4 Place 2 gallons of RYDLYME in the purge cart (or bucket). Circulate the fluid through the heat exchanger
for at least 2 hours (3 recommended).
STEP 5 Disconnect the purge system dispose of the solution. RYDLYME is non-toxic and biodegradable and as
such can be poured down a drain.
* Depending on the plumbing, there should be either unions or boiler drains for to access the heat exchanger.
STEP 6 Connect fresh water and a drain to the heat exchanger ports and flush the exchanger for several minutes.
STEP 7 Return the plumbing to its original configuration and open the IN and OUT valves. Operate the system and
check for improved performance.
COAXIAL HEAT EXCHANGER FLUSHING PROCEDURE - GROUND LOOP
STEP 1 Isolate the heat exchanger by placing the pump module valves in the exchanger flushing position.
STEP 2 Connect a compressed air and a drain pipe to the pump module purge ports and blow the anti-freeze solu-
tion into a clean 5 gallon bucket.
STEP 3 Connect a purge cart to the pump module purge ports.
STEP 4 Place 2 gallons of RYDLYME in the purge cart. Circulate the fluid through the heat exchanger for at least 2
hours (3 recommended).
STEP 5 Disconnect the purge cart and dispose of the solution. RYDLYME is non-toxic and biodegradable and as
such can be poured down a drain. Clean the purge cart thoroughly.
* Depending on the plumbing, there should be either unions or boiler drains for to access the heat exchanger.
STEP 6 Connect fresh water and a drain to the pump module purge ports and flush the exchanger for several
minutes.
STEP 7 Blow the heat exchanger out with compressed air as per STEP 2 and dump the water down a drain.
STEP 8 Connect the purge cart to the pump module purge ports. Re-fill and purge the heat exchanger with as per
standard procedures (the anti-freeze from STEP 2 can be re-used).
STEP 9 Disconnect the purge cart and set the pump module valves back to the original positions.
STEP 10 Operate the system and check for improved performance.
General Maintenance