9.11 Firing
Figure 9.11.i Firing
The burner has now completed the start-up sequence.
T71 Release to modulate is activated to switch control of the servo motor to the load sensor and the burner fires
normally and modulates according to this load sensor.
The Flame Safeguard controller remains in the Firing phase shown in Figure 9.11.i until the signal on T53 is removed,
indicating a shutdown of the burner, or a flame detection error is seen.
With an On/Off burner, T71 is not connected and the burner just continues to fire so long as a flame is detected.
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