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3. Remove the flue from the induced draft blower and
the collector box cover from the partition panel.
4. The primary heat exchanger tubes can be cleaned
using a round wire brush attached to a length of high
grade stainless steel cable, such as drain cleanout
cable. Attach a variable speed reversible drill to the
other end of the spring cable. Slowly rotate the cable
with the drill and insert it into one of the primary heat
exchanger tubes. While reversing the drill, work the
cable in and out several times to obtain sufficient
cleaning. Use a large cable for the large tube, and
then repeat the operation with a small cable for the
smaller tube. Repeat for each tube.
5. When all heat exchanger tubes have been cleaned,
replace the parts in the reverse order in which they
were removed.
6. To reduce the chances of repeated fouling of the
heat exchanger, perform the steps listed in "Start-up,
Adjustments, and Checks".
Main Burner Flame (Qualified Servicer Only)
Flames should be stable, soft and blue (dust may cause
orange tips but must not be yellow). The flames must
extend directly outward from the burner without curling,
floating or lifting off.
Check the burner flames for:
1. Good adjustment
2. Stable, soft and blue
3. Not curling, floating, or lifting off.
Burner Flame
At least once a year, prior to or during the heating season,
make a visual check of the burner flames.
NOTE: This will involve removing and reinstalling the heat
exchanger door on the unit, which is held by two screws.
If you are uncertain about your ability to do this, contact a
qualified servicer.
If a strong wind is blowing, it may alter the airflow pattern
within the unit enough that an inspection of the burner
flames is not possible.
1. Shut off electric power and gas supply to the unit.
2. Remove the screws securing the manifold to the
burner retention bracket. Remove the manifold and
rotate each burner counterclockwise to remove.
3. Remove the burners.
4. Use a bottle brush to clean burner insert and inside
of the burners.
5. Replace burners and manifold, inspect the burner
assembly for proper seating of burners in retention
slots.
6. Reconnect electrical power and gas supply.
Manifold
Manifold Assembly
For further information on the yearly inspection, consult the
User Manual. It is recommended that a qualified servicer
inspect and service the unit at least once each year.
Turn the unit on at the thermostat. Wait a few minutes,
since any dislodged dust will alter the normal flame
appearance. Flames should be predominantly blue and
directed into the tubes. They should not be yellow. They
should extend directly outward from the burner ports
without curling downward, floating or lifting off the ports.
20
Burner
Burner
Bracket
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