22 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 7 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
●
2 flush valves (if not installed)
Note
Before flushing the heat exchanger,
additional flush valves (“A” and “B”) must
be installed on the near boiler piping
(included with Navien Manifold System).
A
C
B
D
Check the Burner Flame
1. Inspect flame through observation window.
2. If the flame is unsatisfactory at either high fire
or low fire, check for obstructions in the venting
and ensure that the air intake filter is clean.
Review with the Owner
1. Review the User’s Information Manual with the
owner.
2. Emphasize the need to perform the
maintenance schedule.
3. Remind the owner of the need to call a licensed
contractor should the boiler or system exhibit
any unusual behavior.
4. Remind the owner to follow the proper
shutdown procedure and to schedule an annual
start-up at the beginning of the next heating
season.
Summary of Contents for NCB-190/060H
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