Typical Burner Sequence Of Operation - 7505 Control - Beckett CF375 User Manual

Section: Wire the Burner

Typical Burner Sequence of Operation - 7505 Control.

Refer to the appliance manufacturer's wiring diagram for actual specifi cations.
1. Standby: The burner is idle, waiting for a call for
heat.
2. Valve-On Delay: The igniter and motor are on while
the control delays turning on the oil solenoid valve
for the programmed time.
3. Trial For Ignition: The oil solenoid valve is
energized. A fl ame should be established within the
factory set trial for ignition time (lockout time).
4. Lockout: The control has shut down for one of the
following safety reasons:
a. The trial for ignition (lockout) time expired
without fl ame being established.
b. The cad cell detected fl ame at the end of the
Valve On Delay state.
To reset the control from lockout click the button
1-second.
NOTE: A recurrence of the above failure modes or a
failed welded relay check could cause the control to
enter a Hard Lockout state that must be reset only by a
qualifi ed service technician.
To reset from Hard Lockout, hold the reset button for 15
seconds until the yellow light turns on.
12
1
3
2
Valve-on delay
5
6
8
Motor-off delay
9
Standby
4
Trial for
ignition
Ignition carryover
7
Run
5. Ignition Carryover: Once fl ame is established,
the igniter remains on for 10 additional seconds to
ensure fl ame stability.
6. Run: The fl ame is sustained until the call for heat
is satisfi ed. The burner is then sent to Motor-Off
Delay, if applicable, or it is shut down and sent to
Standby.
7. Recycle: If the fl ame is lost while the burner is
fi ring, the control shuts down the burner, enters a
60 second recycle delay, and repeats the ignition
sequence. The control will continue to Recycle
each time the fl ame is lost, until it reaches a pre-set
time allotment. The control will then go into Hard
Lockout instead of recycle. This feature prevents
excessive accumulation of oil in the appliance fi ring
chamber.
8. Motor-Off Delay: If applicable, the oil solenoid
valve is turned off and the control delays turning the
motor off for the set motor-off delay time before the
control returns to standby.
9. Pump Prime: The igniter and motor are on with the
oil solenoid valve energized for 4 minutes. During
Pump Prime mode, the cad cell is disregarded,
allowing the technician to prime the pump without
having to jumper the cad cell.
Pump
prime
Lockout
Recycle