Start Up Burner/Set Combustion; Resetting From Restricted Or Hard Lockout; Cad Cell Resistance Measurement - Beckett AF Series Manual

Section: Start-up Burner
Start Up Burner/Set
Combustion
Hot Gas Puff-Back and
Heavy Smoke Hazard
Failure to prime the pump properly could result in
unstable combustion, hot gas puff-back and heavy
smoke.
y Do not allow oil to spray into a hot combustion
chamber while bleeding air from the pump.
y Install 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
during the air bleed procedure.
y Ensure that all bubbles and froth are purged from
the oil supply system before tightening the pump
bleed valve.
y Ensure that the appliance is free of oil and oil vapor
before starting or resetting the burner.
1. Open the shutoff valves in the oil supply line to the
burner.
2. Close air band and partially open air shutter. This
is an initial air setting for the pump bleeding
procedure only. Additional adjustments must be
made with instruments.
3. Set the thermostat substantially above room temperature.
4. Close the line voltage switch to start the burner. If
the burner does not start immediately you may have
to reset the burner primary control.
5. Initiate a call for heat.
6. After the burner starts, press and hold the reset
button for 15 seconds until the yellow light turns on.
This indicates that the button has been held long
enough.
7. Release the reset button. The yellow light will turn
off and the burner will start up again.
8. At burner start up, click the reset button while the
igniter is still on. This will transition the control
to a dedicated Pump Prime mode, during which
the motor, igniter, and valve are powered for four
minutes. The yellow light will be on.
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9. Bleed the pump until all froth and bubbles are
purged. If desired, terminate the call for heat or
hold the reset button for at least one second to exit
Pump Prime mode and return to Standby.
10. At the end of 4 minutes, the yellow light will turn off
and the control will automatically return to standby
mode.
11. If prime is not established during the four minute
pump prime mode, return to step 8 to re-enter
Pump Prime mode. Repeat steps 8 through 10
until the pump is fully primed and the oil is free of
bubbles.
12. Terminate the call for heat, and the control will
resume normal operation.

Cad Cell Resistance Measurement

○ The Beckett 52082U Contractor Tool can be used to
directly read the cad cell ohms while the burner is in
operation.
○ If a Contractor Tool is not available, the cad cell
leads can be unplugged from the control and
the resistance measured with a meter in the
conventional way. Conduct these tests with flame
present.
Flame Detection Range
Normal = 0 to 1600 ohms
Limited = 1600 ohms to lockout

Resetting From Restricted or Hard Lockout

○ If the control continues to lockout without a satisfied
call for heat, or fails the motor relay check, the
control enters Hard (restricted) Lockout in order to
limit accumulation of unburned oil in the combustion
chamber.
○ To reset, hold the button down for 15 seconds until
the red light turns off and the yellow light turns on.
○ Always verify the control functions according to all
specifications before leaving the installation site.
○ Replace the control if it does not operate as
specified.