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Section 4
Adjustments
28.Main Gas Burner Air Inlet
Shutters (Gas Models)
Refer to Figure 1.
Air inlet 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 air supplied to the burner
while closing the shutter decreases the air supply.
Adjust air shutter as follows:
a. Unlock and remove the access door. Remove
guard on rear of unit.
b. Start the tumbler and check the flame pattern.
Correct air and gas mixture is indicated if the
flame pattern is primarily blue, with small
yellow tips, and bends to the left of the heater
section. Too little air is indicated if the flame
is yellow, lazy and smoky.
c. To adjust the air inlet shutter, loosen adjusting
screws.
d. Push or pull shutters in or out as necessary to
obtain desired flame intensity.
e. After shutter is adjusted, tighten locking
screw securely.
f. If the shutter is correctly adjusted, but the
flame pattern is stright up, insufficient air is
flowing through the tumbler. A flame pattern
that flares to the right and left indicates that
no air is flowing through the tumbler. Check
make-up air and exhaust vent.
To reduce the risk of electric shock, fire, explosion, serious injury or death:
• Disconnect electric power to the tumbler before servicing.
• Close gas shut-off valve to gas tumbler before servicing.
• Close steam valve to steam tumbler before servicing.
• Never start the tumbler with any guards/panels removed.
• Whenever ground wires are removed during servicing, these ground wires must be
reconnected to ensure that the tumbler is properly grounded.
W002
WARNING
The air inlet shutters on the burner must be
adjusted so sufficient primary air is metered
into the system for proper combustion and
maximum efficiency. Before adjusting the
inlet shutter be sure that all lint is removed
from lint compartment and lint screen.
W281
CAUTION
Figure 1
PROPER
AIRFLOW
AIR SHUTTER
ADJUSTING SCREWS
INSUFFICIENT
AIRFLOW
NO AIRFLOW
AIR SHUTTER
ADJUSTING SCREWS
AIR SHUTTER
ADJUSTING SCREWS
TMB1780S
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