47
®
FIGURE 20.
Wiring
Attach the cable supplied with the scanner to a junction box. Splice the cable wires to a pair of wires
not smaller than #l8. Install the complete run in a separate conduit to the control. Continuous conduit
bonding between scanner and the control is mandatory! Scanner may be located up to 100 feet from
control. Do not pass scanner wiring through any junction box containing other wires. Do not run
other wires through scanner conduit. Asbestos insulated wire should be avoided.
OPERATION - IR LEARN (for IR models prior to version 12 only)
The BurnerLogix IR learn adapts the operation of the amplifier to the actual burner environment.
'Out of the box', the BurnerLogix IR system is shipped with its sensitivity and thresholds set to detect
most firing conditions and does not require learning. The purpose of the LEARN process is to maxi-
mize reliable flame detection over a wide range of conditions. The learn process sets the optimum
values for the flame on and flame off thresholds during pilot trial for ignition and the main firing
period separately. The LEARN process allows the BurnerLogix system to better differentiate
between real and simulated flame conditions. Simulated flame can be caused by burner throat modu-
lation, radiation from the refractory tiles, or steam atomization. The result of this technique of flame
detection assures a positive flame out response for usual or adverse conditions. Although it is not
necessary to perform an IR LEARN, it is suggested this be done as part of the installation process or
when the 48PT2 scanner is changed.
The type of burner and fuel will affect the amplitude and radiation characteristics of the flame. Gas-
eous flames tend to have low amplitude and radiation whereas oil flames have a high amplitude and
radiation. On burners having the option to fire both gaseous and oil fuels, it is recommended the
LEARN process be performed on the condition that has the lowest signal level. Normally this condi-
tion is gas at low fire.
The LEARN process in the BurnerLogix system is initiated through the keypad display module. The
menu item is located under the PROGRAM SETUP menu and is called DO IR LEARN. Refer to the
section titled
'SETTING PROGRAMMER PARAMETERS'
for information on setting opera-
tional values. Since the default value is NO, the user must modify this value to YES.
MDFY TO CHANGE
DO IR LEARN YES
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 thresh-
olds for pilot flame are not affected. It is necessary to have separate learns to adjust for the character-
istics of the flame changing conditions due to changes in background conditions after a long firing
period.
CENTER LINE
OF MAIN FLAME
SCANNER
LINE-OF-SIGHT
SCANNER TARGET
ABOVE REFRACTORY
COMBUSTION
CHAMBER
PILOT
BURNER
SCANNER
SCANNER
SIGHTING TUBE
MAIN
BURNER
SCANNER MUST NOT
SIGHT REFRACTORY
Содержание BurnerLogiX BLL510
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