Beckett ADC B. Combustion Set-up, Explosion and Fire Hazard, C. Set Combustion with Instruments

Section: Start Up Burner & Set Combustion

Igniter with Interrupted Duty Ignition - This optional control circuit is available to reduce current draw on the charging system by turning the igniter off after a flame has been established. This option controls igniter operation based on a signal from a light sensing cad cell. When light hits the cell the control will sense a decrease in resistance across the sensor. A few seconds delay will occur prior to the igniter switching off. As long as sufficient light is reaching the cell eye, the igniter will remain off. If light is removed from the sensor, the igniter will turn on until light is again sensed by the cad cell.

With 7556 Primary Safety Control - The 7556 control provides the same benefits as the ignition control board as described above as well as added safety, convenience, and performance features. It adds a valve on delay and motor-off delay to the burner’s operation sequence that promote clean burner operation. It has a lock-out function that shuts the burner down if it is not operating properly. The control adds fusing at the burner to protect against component failures. The control also has redundant motor relays that are checked for proper operation every heat cycle.

Variations to the burner circuits may occur due to optional temperature, pressure, and vacuum switches that control burner operation. Note that when external switches are used to control motor operation they must be sized correctly for the rated current or a relay should be installed to isolate the switches from the motor’s full load current.

B. Combustion Set-up

As soon as burner motor starts rotating bleed all the air from the pump. (Required with single-pipe systems.)

Explosion and Fire Hazard

Failure to follow these instructions could lead to equipment malfunction and result in heavy smoke emission, soot-up, hot gas puff-back, fire and asphyxiation hazards.

yDo not attempt to start the burner when excess oil has accumulated in the appliance, the appliance is full of vapor, or when the combustion chamber is very hot.

yDo not attempt to re-establish flame with the burner running if the flame becomes extinguished during start-up, venting, or adjustment.

yVapor-Filled Appliance: Allow the unit to cool off and all vapors to dissipate before attempting another start.

yOil-Flooded Appliance: Shut off the electrical power and the oil supply to the burner and then clear all accumulated oil before continuing.

yIf the condition still appears unsafe, contact the Fire Department. Carefully follow their directions.

yKeep a fire extinguisher nearby and ready for use.

To bleed the pump, attach a clear plastic hose over the vent fitting. Loosen the fitting and catch the oil in an empty container. Tighten the fitting when all air has been purged from the supply system. Note: If the burner stops after a flame is established, the unit probably requires additional bleeding. Continue to bleed the system until the pump is primed and a flame is established when the bleed valve is closed.

C. Set Combustion with Instruments

1.Allow the burner to run for approximately 5 to 10 minutes.

2.Follow these four steps to properly adjust the burner:

Step 1: Adjust the air until a trace smoke level is achieved.

Step 2: At the trace of smoke level, measure the CO2 (or O2). This is the vital reference point for further adjustments.

Step 3: Increase the air to reduce CO2 by 1 percentage point (O2 will be increased by approximately 1.4 percentage points).

Step 4: Recheck the smoke level. It should be zero.

3.This procedure provides a margin of reserve air to accommodate variable conditions.

4.Once the combustion level is set, tighten the fasteners on the air band and air shutter.

5.Start and stop the burner several times to ensure satisfactory operation.

6.Test the equipment safety controls to verify they function according to the manufacturer’s specifications.

Figure 9. – Air supply components

Air band position indicator

Shutter position indicator

12 Vdc ADC Burner Manual

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