CleaverBrooks FLX 1000, Operation, Service And Parts Manual

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Profire V Burner Chapter 2
750-177 2-37
LOW NOX FULL MODULATION COMBINATION GAS BURNER ADJUSTMENT
LNV burners are equipped with an FGR (flu gas recirculation) valve to lower the NOx emissions. An adjustable
cam is provided to adjust the FGR valve position throughout the firing range on gas. Follow the steps for gas
from Section 4.4.12 with the following additions:
1. Make sure the FGR valve is in the nearly closed position.
2. Start the burner and hold at low-fire until the boiler is at the proper operating pressure or temperature.
3. With an analyzer in the stack, adjust the FGR valve cam screw to obtain <30 ppm NOx levels.
NOTE: Do not adjust the burner below <20 ppm. Unstable combustion and high CO emissions will result.
4. Monitor O2 and CO levels during this process. The introduction of FGR into the combustion chamber will lower the
flue O2 levels. Too much FGR may induce high levels of CO in the flue gas. It may be necessary to adjust the air
damper blades to raise the O2 to proper low-fire values. If the proper NOx values can not be reached by adjusting
the cam screw, the FGR linkage will have to be adjusted as well.
5. Once the low-fire setting is complete, continue with the instructions above, adjusting the cam at each screw to
obtain the proper NOx values. Verify the values modulating back to low-fire and adjust accordingly.
I. Oil System Adjustments
TYPICAL LOCATION
OF THE POINTER WHEN
AT HIGH FIRE
Refer to the burner data plate located inside the control
panel door. The nameplate will list the following burner
information:
• burner and control voltage
• phase
• cycle
• motor amperage
• maximum and minimum fuel input settings
• manifold pressure (at zero furnace pressure - add the
furnace pressure to get the correct manifold pressure at
maximum firing rate)
These procedures assume that the pre-startup tasks and
check list have been performed in accordance with the
instructions in this manual.
For most efficient combustion, allow the boiler to fully warm up before making adjustments.
ON-OFF OIL BURNER ADJUSTMENT
On-Off burners use the Suntec B2TC-8931 oil pump model. High-fire pressure adjustment is 200 - 300 psi
(solenoid energized), and low-fire pressure adjustment is 100 - 200 psi (solenoid de-energized).
1. Briefly push in the starter contact and release to ensure that the blower motor and oil pump are rotating in the cor-
rect direction.
2. Turn the burner switch to the “ON” position.
3. Make sure a pressure gauge, 0 - 600 psi range, is installed downstream of the solenoid valves. Adjust the burner