3-52 Commissioning – Tuning the Burner
FlexFit – Linkageless Control – Revision 1.0
PREFERRED
UTILITIES MFG CORPORATION
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6. If a ame is not detected, the FlexFit will lockout. Readjust the ignition curve points, pilot ame, igniter, or ame detector,
reset the FlexFit, and restart the burner.
7. After a satisfactory pilot ame is established, turn the burner switch to OFF.
8. Manually close the pilot fuel supply valve.
9. Start the burner by placing the burner switch in ON.
10. Once the burner reaches the PTFI state, observe the ame intensity signal and verify that after 10 seconds the burner
goes into lockout due to PTFI failure. During this time the ame intensity should be less than 1.25 VDC (<25%).
11. If a ame is detected, realign the ame scanner or shield the ignition spark from the ame scanner's view.
12. Place the burner switch in OFF and reset the FlexFit.
13. Repeat the above steps as necessary until you reach a satisfactory pilot ame adjustment.
14. Open the main and pilot fuel supply valves.
15. Take the FlexFit out of Pilot Test Hold. (Navigate to Main Menu > Tuning > Pilot Test Hold to change this option from ON
to OFF).
Main Flame Test
1. Proceed through a normal startup.
2. Verify that the main ame is established within 5-15 seconds of the fuel valves opening and the ame intensity signal is
at least 1.25 VDC (≥25%).
3. If the main ame is not detected, the FlexFit will lockout. If necessary, readjust the ignition curve points, pilot ame (or
igniter for DSI burners), or ame detector, reset the FlexFit, and restart the burner. If adjustments are made to the ame
scanner or pilot ame, re-perform the pilot ame test.
4. If this does not x the problem, check for proper pilot size (or igniter for DSI burners), proper fuel/air ow, fuel supply
pressure, and proper valve operation.
5. If necessary, make ignition curve point adjustments for ame stability.
6. After a satisfactory main ame has been established, shut the main fuel supply valve, and verify the burner goes into
lockout within 4 seconds after the main ame goes out.
7. Open the main fuel supply valve, reset the burner, and proceed through a normal startup. View all states, observing a
stable ame during ignition, pilot ame alone, pilot + main ame, and main ame alone.
Pilot Turndown Test (Non-DSI Burners)
1. Shut down the burner.
2. Place the FlexFit into Pilot Test Hold. (Navigate to Main Menu > Tuning > Pilot Test Hold to change this option from OFF
to ON).
3. Start the burner by placing the burner switch in ON.
4. After the pilot is lit, slowly reduce the fuel supply the to pilot until the ame intensity signal is at 1.25VDC (25%). This is
the minimum pilot ame that the ame detector will detect.
5. Take the FlexFit out of Pilot Test Hold. (Navigate to Main Menu > Tuning > Pilot Test Hold to change this option from ON
to OFF).
6. Observe the light-off of the main ame and verify it is smooth and normal.
7. If it is not, realign the detector so that a larger pilot ame is required to cause a 1.25 VDC (25%) reading.
8. Repeat the test until a smooth, reliable light-off occurs.
9. Return the fuel supply to the pilot to normal.
Tuning the Burner
Fuel/Air Ratio Curves
At this time, the commission mode is still enabled, and the burner has successfully lit the main ame – ring at the same fuel
position as the ignition position. Before storing this rst point as the rst curve point, ensure that the air is adjusted to the desired
excess air level and that there is no smoke or appreciable carbon monoxide present. To store this rst point, go to Main Menu > Curve
Commissioning > Set Points > Set Curve Points. Use the UP and DOWN button sets to move the servos to their desired positions
Note
Ensure the fuel train is
free of air. If the pilot
line and ame scanner
appear to be adjusted
properly, but you can not
get a main ame to light,
try cycling the burner a
few times to purge air
from the fuel train.
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