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Adjustments
Gas Burner Air Shutter
NOTE: Air inlet shutters on the burner must be
adjusted so sufficient air is metered into the system
for proper combustion and maximum efficiency.
Before adjusting the inlet shutters be sure that all
lint is removed from lint compartments and lint
screen.
Air shutter adjustments will vary from location to
location and will depend on the vent system, number
of units installed, make-up air and line gas pressure.
Opening the shutter increases the amount of primary
air supplied to the burner while closing the shutter
decreases the primary air supply. Adjust air shutter as
follows:
Refer to Figure 18.
1. Open the access panel.
2. Start the tumbler and check the flame pattern. If
the flame pattern is straight up, insufficient air is
flowing through the tumbler and air flow switch
is improperly set. A flame pattern that flares to
the right and left indicates no air is flowing
through the tumbler.
3. Correct air and gas mixture is indicated if the
flame pattern is primarily blue, with small yellow
tips, and bends to the right of the heater section.
Too little air is indicated if the flame if yellow,
lazy and smokey.
4. To adjust the air shutter, loosen air inlet shutter
adjusting screw.
5. Open or close air shutter as necessary to obtain
proper flame intensity.
6. After air shutter is adjusted for proper flame,
tighten air shutter adjusting screw securely.
Figure 18
T457I
1 Air Shutter Adjusting Screws
T457I
1
PROPER AIRFLOW
INSUFFICIENT AIRFLOW
NO AIRFLOW
1
1