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To adjust excess air flow into the burner: (Diagram 14)
1) Loosen screw (A) and rotate air band (B) to the wide open position, then tighten
screws.
2) Loosen 2 screws (C) and rotate the air shutter (D) until the pointer arrow (E) points
to the number 8 setting.
3) Start the burner and allow it to run for about 10 minutes.
4) Loosen the viewport retaining bolt (F) and swing cover (G) out of the way as shown.
5) While observing the flame through the view port , decrease the air shutter (D) by
rotating it until the flame tip appears slightly smoky, then increase the air until the
flame clears up. The arrow (E) should be in the vicinity of 7 - 10. Tighten two screws
(C).
6) Close and secure viewport.
The excess air adjustments on the Beckett ADC burner are essential to prevent the poten-
tial damage to the burner and the burner combustion chamber. Excess air is required to
insure that the carbon and hydrogen are supplied with enough oxygen to burn completely.
If there is not enough excess air, the unit will smoke inside the combustion chamber and
eventually lead to unburned fuel residue left in the chamber. The function of the combus-
tion chamber is to reflect and retain heat to insure that all the atomized oil is burned.
Even a slight amount of soot can decrease the effectiveness of the chamber. It is esti-
mated that 1/8" of soot is equivalent to approximately a 1" thick fiberglass sheet.
With too little excess air, eventually the unburned fuel accumulates into the lining material.
Eventually it will burn even when the burner is turned off. The heat generated by this flame
will vent out through the burner and can cause internal damage to the burner. Typically it
will damage the plastic coupling which operates the fuel pump and it can also damage the
primary control unit. Other common problems include blackening and even distorting the
optic eye.
The burner is factory set with the air band (B) at the wide open position and the air shutter
(D) adjusted typically between the 8 and 10 setting. Decreasing the excess air settings can
lead to the chamber fires as outlined above.
Note that as the nozzle wears, the flame characteristics will change. It is important to
check the nozzle periodically and replace it each year as outlined in the owners manual.
Adjusting Replacement Burner
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