20 Maintaining the Boiler
Flushing the Heat Exchanger
CAUTION
Flushing the heat exchanger is a somewhat complicated
procedure. Read the following instructions carefully before
attempting this procedure. If you are uncertain about any of
the steps in the procedure, contact an authorized technician or
licensed professional. Keep in mind that improper maintenance
can void your warranty.
Refer to the “2.2 Parts of the Boiler” on page 6 for details
about part locations.
Before flushing the Heat Exchanger, gather the following items:
●
A bucket that is 5 gallons or larger
●
Cleaning solution diluted with water
●
3 hoses
●
A water circulation pump
To flush the Heat Exchanger:
A
B
C
D
A
B
C
D
Cold Water
Supply
Hot Water Line
Circulation Pump
Flushing Kit
Navien Easy valve Kit
1. Press the Power button on the front panel to turn off the boiler.
2. Disconnect the power supply to the boiler.
3. Close the “C” and “D” valves on the supply and return water
lines.
4. Connect one tube to the “A” valve and place the free end in the
bucket.
5. Connect one of the tubes to the circulation pump outlet and
the return water line at the “B” valve.
6. Connect one tube to the circulation pump inlet and place the
free end in the bucket.
7. Pour the cleaning solution into the bucket.
8. Open both “A” and “B” valves.
9. Turn on the circulation pump and allow the solution to
circulate through the boiler for at least 45 minutes.
10. Rinse the cleaning solution from the boiler:
a. Remove the free end of the drain tube from the bucket and
place it in the condensate drain or laundry tub (wherever
the boiler drains).
b. Close the “B” valve and open the “D” valve. Do not open the
“C” valve yet.
c. Allow water to flow through the boiler for 5 minutes.
d. Close the “A” valve and open the “C” valve.
11. Disconnect all tubes.
12. Remove the strainer from the boiler and clean out any residue.
13. Reinsert the filter and ensure the filter cap is securely
tightened.
14. Reconnect the power supply to the boiler.
15. Press the Power button on the front panel to turn on the boiler.
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