wc_tx001951gb.fm
74
Operation E 3000
Ignition
carryover
The ignition carryover state starts as soon as the flame is established.
During this state:
The fuel shut-off valve is open (energized).
Pressurized fuel atomizes at the burner nozzle.
The atomized fuel is ignited by the electrodes.
The electrodes stay powered for up to 10 seconds after flame is
sensed.
When the ignition carryover state has elapsed:
The ignition transformer is shut off.
The burner control enters the run state.
If the flame is lost during the ignition carryover state:
If the lockout time has not expired, the burner control returns to trial-
for-ignition state.
If the lockout time has expired, the burner control enters the recycle
mode.
Run The run state starts and continues once the ignition carryover state has
elapsed. During this state:
The fuel shut-off valve is open (energized).
Pressurized fuel atomizes at the burner nozzle.
The flame is monitored by the cad cell.
When the setpoint is reached (call for heat satisfied), the burner control
enters the burner-motor-off delay state.
If the flame is lost during the run state:
The burner control enters the recycle mode.
Burner-motor-
off-delay
The burner-motor-off-delay state starts immediately after the setpoint is
reached, i.e., the call for heat has been satisfied. The time of this state
is 30 seconds. During this state:
The output contacts of the temperature controller open, interrupting
the circuit between terminals labeled “T”.
The fuel shut-off valve closes (de-energizes).
The burner motor runs until the burner-motor-off delay expires, then
the burner motor turns off.
The burner control returns to the idle mode.
If the cad cell detects flame during the burner-motor-off-delay state:
The burner control goes into the standby state.
State Action or Function
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