21
NOTE:
After cleaning, the microamp signal should be stable
and in the range of 4 - 6 microamps DC.
Flame
Sensor
Flame Sensor
Flue Passages (Qualified Servicer Only)
At the start of each heating season, inspect and, if neces-
sary, clean the unit flue passage.
Cleaning Flue Passages (Qualified Servicer Only)
1.
Shut off electric power and gas supply to the unit.
2. Remove burner assembly by disconnecting the gas
line and removing the manifold bracket from the par-
tition panel.
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 ca-
ble. 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 op-
eration with a small cable for the smaller tube. Repeat
for each tube.
5. When all heat exchanger tubes have been cleaned, re-
place 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 “Startup, Adjust-
ments, and Checks”.
Main Burner Flame (Qualified Servicer Only)
Flames should be stable, soft and blue (dust may cause or
-
ange 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
WARNING
T
O AVOID PERSONAL INJURY OR DEATH DUE TO ELECTRIC SHOCK,
DO NOT REMOVE ANY INTERNAL COMPARTMENT COVERS OR ATTEMPT ANY
ADJUSTMENT.
C
ONTACT A QUALIFIED SERVICER AT ONCE IF AN ABNORMAL
FLAME SHOULD DEVELOP.
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.
Cleaning Burners
1.
Shut off electric power and gas supply to the unit.
2. Remove the screws securing the manifold to the burn-
er retention bracket. Remove the manifold and rotate
each burner counterclockwise to remove.
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