wc_tx001951gb.fm
73
E 3000 Operation
4.29 Operating States of the Beckett Burner Controller
Burner states
The burner control has several states that it sequences through during normal
operation. These operating states are described below.
.
Standby
Run
Ignition
carryover
State
10 30
Operating
wc_gr007662
State Action or Function
Standby As soon as power is supplied to the burner control, the burner control
enters the standby state in which it will remain until there is a call for
heat or power is disconnected.
Valve-on
delay
(pre-time)
When the setpoint of the temperature controller is set to a temperature
higher than that of the heat transfer fluid, the output contacts of the tem-
perature controller close, completing a circuit between the two terminals
labeled “T” of the burner control. This is the call for heat. The burner
control enters the valve-on-delay state.
The valve-on-delay state lasts 15 seconds. During this state:
Power is sent to the burner motor/fuel pump.
Power is sent to the electrodes.
If the cad cell detects flame at the end of the valve-on-delay state, the
burner control goes into the lockout state.
Trial-for-
ignition
The trial-for-ignition state immediately follows the valve-on-delay state.
During this state:
The fuel shut-off valve is opened (energized).
Pressurized fuel atomizes at the burner nozzle.
The atomized fuel is ignited by the electrodes.
The burner fires and the flame is monitored by the cad cell.
If flame is detected, the burner control moves to the ignition carryover
state.
If flame is not detected within 15 seconds:
The burner control enters the lockout state.
Power is disconnected from the fuel shut-off valve, electrodes, and
the burner motor.
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