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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".
M
B
F
(Q
AIN
URNER
LAME
UALIFIED
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.
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 ex-
changer 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.
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.
S
O
)
ERVICER
NLY
Manifold
20
Check the burner flames for:
1. Good adjustment
2. Stable, soft and blue
3. Not curling, floating, or lifting off.
Burner Flame
Burner
Manifold Assembly
Burner
Bracket
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