23
Maintaining the Boiler
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. Refer
to the manufacturer’s literature for information
about the circulation time.
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 “D” 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 and valves.
12. Reconnect the power supply to the boiler.
13. Press the Power button ( ) on the front panel
to turn on the boiler.
To flush the Heat Exchanger:
A
B
C
D
Flushing Kit
Circulation Pump
Heating Return
Heating Supply
Navien
Manifold
System
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 heating
supply and heating return 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 heating return line at the
“B” valve.
6. Connect one tube to the circulation pump inlet
and place the free end in the bucket.
Summary of Contents for NCB-190/060H
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