Section IV

Adjustments

MAIN GAS BURNER AIR SHUTTER All Gas Models

NOTICE: 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 compartment 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:

1.Open the access panel.

2.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 right of the heater section. Too little air is indicated if the flame is yellow, lazy and smokey. Refer to Figure 16.

3.To adjust the air shutter, loosen air inlet shutter adjusting screw. Refer to Figure 16.

4.Open or close air shutter as necessary to obtain proper flame intensity.

5.After air shutter is adjusted for proper flame, tighten air shutter adjusting screw securely. Control panel may have to be removed temporarily to loosen air shutter screws to adjust shutter.

6.If the shutter is correctly adjusted, but the flame pattern is straight up, insufficient primary air is flowing through the tumbler and airflow switch is improperly set. A flame pattern that flares to the right and left indicates no air is flowing through the tumbler. Refer to Figure 16.

PROPER

INSUFFICIENT

NO AIR FLOW

AIR FLOW

AIR FLOW

 

T048SE3A

T047SE3A

T049SE3A

AIR SHUTTER

AIR SHUTTER

AIR SHUTTER

ADJUSTING

ADJUSTING

ADJUSTING

SCREWS

SCREWS

SCREWS

Figure 16

M414545

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