• Check the fire side of the heat
exchanger: only clean loose
residue from the heat exchanger
coil, use a vacuum cleaner and
nylon brush, and do not push the
residue between the openings
of the coils if at all possible as
this may impede the flow of the
products of combustion.
• Use inspection mirror to check
all heat passage spaces between
coils, and using a short, thin
putty knife or strip of stainless
steel, remove all debris.
These
passages MUST be free and
clear for proper heat transfer
to occur.
Rinse well all loose
debris that was pushed down to
the bottom of the condensate
collection tray.
• It is recommended to only use
clear water to rinse any remaining
residue away—the water
will automatically flow to the
condensate drain point.
•
If surface or coil gap fouling
still exists after the above
measures have been taken,
the heat exchanger requires
additional cleaning.
Use a non-
acid based cleaning solution, such
as Fernox F3, to thoroughly soak
the remaining residue. Brush
clean and then completely rinse
all residue and cleaning solution
down the condensate drain
assembly. Repeat if necessary.
(See complete cleaning instructions
on page 50–52)
• Check the distance from the
electrode to the burner; there
should be a 3/8" gap in between
the two. If the existing electrode
pins must be adjusted for proper
gap, caution must be exercised,
as they will likely be brittle from
exposure to the flame; try to
bend them as close to the burner
door insulation as possible using
two pair of pliers; one to support
the rod, and one to bend with.
New electrodes will be less
susceptible to breakage during
adjustment. The metal surface
of the electrodes should also
be carefully cleaned with
emery cloth.
NOTE: Do not make any
adjustments or cleaning with
the electrode still mounted to
the burner door, as damage to
refractory may result!
• Dismantle the air gas mixing
plate or chamber on the
suction side of the fan
and check for fouling. If
required, clean the fan
blade wheel and the air
gas mixing box.
• Reassemble the burner chamber,
making sure there is no
moisture on any of the
fireside components.
47
PART 8. MAINTENANCE
Cleaned heat exchanger—
prior to rear wall installation
Cleaned heat exchanger—
after rear wall installation
Burner & door assembly—
prior to fiberboard installation