Beckett CF500, CF800 manual Explosion and Fire Hazard, Hot Gas Puff-back Heavy Smoke Hazard

Start the Burner

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 ac- cumulated 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.

‰Starting the burner and venting air

Priming the pump

yInitiate a call for heat

yWhile the ignition is on, press and release the reset but- ton on the R7184 control (hold 1/2 second or less). If the control has not locked out since it’s most recent complete heat cycle, the lockout time will be extended to 4 minutes (45 seconds in earlier units), and the igni- tion will remain on the entire heat cycle.

yBleed the pump until all froth and bubbles are purged. If prime is not established within the extended lockout time, the control will lock out. Press the reset button to reset the control and return to the functions listed in the previous step.

Hot Gas Puff-back and

Heavy Smoke Hazard

Failure to bleed the pump properly could result in unstable combustion, hot gas puff-back and heavy smoke.

yDo not allow oil to intermittently spray into a hot com- bustion chamber while bleeding.

yInstall a gauge in the nozzle discharge port tubing or fully open the pump bleed valve to prevent oil spray from accumulating in the combustion chamber when venting air from the fuel pump.

yEnsure that all bubbles and froth are purged from the oil supply system before tightening the pump air bleed valve.

yRepeat the previous steps if needed, until the pump is fully primed and the oil is free of bubbles. Then ter- minate the call for heat, and the control will resume normal operation.

Resetting from restricted lockout

yIf the control locks out three times in a row without a complete heat cycle between attempts, the lockout be- comes restricted. A qualified service technician should be called to inspect the burner.

Disable function

yAny time the motor is running, press and hold the reset button to disable the burner. The burner will remain off as long as the button is held and will return to standby when released

CAD cell resistance check

yWhile the burner is firing, and after the ignition has been turned off, press and release the reset button (hold 1/2 second or less) to check the cad cell resistance. The LED will flash 1 to 4 times, depending on the cad cell resistance (refer to the table below).

Number of LED	Cad Cell Resistance (ohms)
Flashes
1	Normal (0 to 400)
2	Normal (400 to 800)
3	Normal (800 to 1600)
4	Limited (1600 to Lockout)*

* Lockout can occur above 4000 ohms.

LED Indicator	Status
On	Flame sensed
Off	Flame not sensed
Flashing (1/2 sec off - 1/2	Lockout/Restricted
sec on)	Lockout
Flashing (2 sec off - 2 sec	Recycle
on)

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