SECTION III Adjustments

MAIN GAS BURNER AIR SHUTTER (All Gas Models)

NOTICE: Both air inlet shutters on burner must be adjusted so sufficient air is metered into system for proper combustion and maximum efficiency. Before adjusting 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 vent system, number of units installed, make-up air and line gas pressure. Opening shutter increases amount of primary air supplied to burner while closing shutter decreases primary air supply. Adjust air shutter as follows:

1.Unlock and open access door.

2.Start tumbler and check flame pattern. Correct air and gas mixture is indicated if flame pattern is primarily blue, with small yellow tips, and bends to right of heater section. (See Figure 29.) Too little air is indicated if flame is yellow, lazy and smokey.

3.To adjust air shutter, loosen air inlet shutter adjusting screw, see Figure 29.

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 turn shutter.

6.If shutter is correctly adjusted, but flame pattern is straight up, (Figure 29), insufficient primary air is flowing through tumbler and airflow switch is improperly set. A flame pattern that flares to right and left (Figure 29) indicates no air is flowing through tumbler.

AIR FLOW SWITCH

(Gas and Electric Models, see Figure 30)

Air flow switch is set at factory for proper operation. Steam models do not have an air flow switch. However, if there is a problem with airflow switch, it should be adjusted as follows:

NOTICE: Control panel must be in place and access door closed before attempting to adjust air flow switch.

IMPORTANT: Air flow switch disc must remain closed during operation. If it opens and closes during drying cycle, this indicates insufficient air flow through tumbler.

PROPER

INSUFFICIENT

NO AIR FLOW

AIR FLOW

AIR FLOW

 

T048SE3A

T047SE3A

T049SE3A

AIR SHUTTER

AIR SHUTTER

AIR SHUTTER

ADJUSTING

ADJUSTING

ADJUSTING

SCREWS

SCREWS

SCREWS

NOTE: Burner configuration will differ between the 30, 50 and 75 pound tumblers, but flame pattern will be as shown.

Figure 29

M412616

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