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The LEARN process is not subject to the 8-hour burn-in and therefore will always be available. If the LEARN
process is activated at STANDBY, the LEARN process will involve both pilot and main flame. If the LEARN process
is activated during the main firing period (AUTO) the LEARN process will only involve the main flame learn. During
this LEARN process in AUTO, the thresholds for pilot flame are not affected. It is necessary to have separate learns
to adjust for the characteristics of the flame changing conditions due to changes in background conditions after a long
firing period.
Once a LEARN process is activated, it cannot be undone. Also, if a LEARN cannot be completed in the
subsequent burner cycle due to burner interruptions or a flame fail, the LEARN process will continue to
remain active. During PTFI, the LEARN process takes place during the last 3 seconds of the pilot period and is
indicated on the display:
PTFI 80
LEARNING FLAME
During AUTO the LEARN process takes place during the first 3 seconds of AUTO and is indicated on the display
HOLD 80
LEARNING FLAME
After the LEARN process is completed the flame signal displayed value is normalized to a value of 32.
AUTO 32
FLAME SIGNAL
Therefore, during the next pilot trial for ignition period, the expected value of flame signal should be 32.
PTFI 32
FLAME SIGNAL
Any increases or decreases in amplitude or radiation may cause the displayed value to increase or decrease. Should
the displayed value continue to decrease, possibly due to changing conditions in the boiler such as a bright
background causing a reduction in scanner sensitivity, it is suggested to activate a new DO IR LEARN during
AUTO. Without shutting the burner off, scroll to PROGRAM SETUP and in that sub-menu, modify DO IR
LEARN to YES. The LEARN function will be activated immediately. [Note: The display will continue to indicate
YES even though the LEARN process is complete. Pressing the up arrow and then down arrow will indicate the
updated state of DO IR LEARN.]
An abrupt change in the background radiation (brightness) may be an indication that the firing characteristics of
the fuel have changed. In oil fired units this may be caused by a sudden interruption in the oil delivery. The
BurnerLogix utilizes this information to make a decision to keep the burner online or force a shut down. A
lockout will happen if the background radiation (brightness) changes downward by 20% in and stays at this level
for 1 FFRT. Also, if the detected flame signal average falls below 20% of the Learned-On value, the burner will
also be shut down.
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