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Chapter 2
Gas Code" NFPA No. 54, ANSI No. Z 223.1 (for Canada, the
Canadian Gas Association (CGA) B149 and Canadian
Standards Association (CSA) B140 codes shall prevail).
Gas train components upstream of the butterfly valve are
shipped loose. These components should be mounted by the
installer as close to the butterfly valve as practical. Normally,
the control train is ordered to suit a particular code or
insurance regulation, such as Underwriters Laboratories Inc.,
CGA, or Factory Mutual.
Arrange gas piping at the burner so that the burner is
accessible for servicing without disassembly.
The gas pilot supply line must be connected upstream of the
main gas regulator. If a reducing bushing is required between
the house piping and the burner piping, it should be close to
the burner shut-off valve.
The gas piping must be internally clean and free of foreign
material. Before using in service, a leak test must be
performed.
Installation Checklist
All burners are carefully assembled and tested at the factory,
but before being placed in service, all connectors should
again be checked for looseness caused during shipment.
Check:
• Electrical terminals in the control panel and on all
electrical components.
• Pipe fittings and unions.
• Tubing connections.
• Nuts, bolts, screws.
Before operating pumps, metering heads and compressors,
make certain that reservoirs are properly filled with the
specific lubricant. Open all necessary oil shut-off valves. Do
not run compressors, pumps, or metering units without oil.
Before connecting electrical current to any component, be
sure the supply voltage is the same as that specified on
component nameplates.
Before burner operation, be sure all motors are rotating in the
correct direction.
Before firing, make sure that the refractory flame cone is
properly sealed to the burner mounting flange and the boiler
front plate.
Make certain that the operator in charge is properly instructed
in the operation and maintenance procedures
2-6
!
Before opening the gas shutoff valves, read the
regulator instructions carefully. Open the shutoff
valve slowly to allow inlet pressure to build up slowly
in the regulator until it is fully pressurized. Opening
the shutoff valve quickly will damage the regulator.
Do not exceed the regulator pressure ratings.
!
Lubricating oil is drained from the air/oil tank before
shipment. Before attempting to start the burner, add
oil to the recommended level.
G. FGR System - Low NOx
Applications
LNEV burners are equipped with an FGR (flue gas
recirculation) valve to lower the NOx emissions. An actuator
is provided to adjust the FGR valve position throughout the
firing range on gas. Follow the steps below to adjust
combustion while using FGR:
Make sure the FGR valve is in the nearly closed position.
Start the burner and hold at low fire until the boiler is at the
proper operating pressure or temperature.
With an analyzer in the stack, adjust the FGR amount to
obtain sub 30 ppm NOx levels.
NOTE: Do not adjust the burner below 20 ppm.
Unstable combustion and high CO emissions will
result.
Monitor O
and CO levels during this process. The
2
introduction of FGR into the combustion chamber will lower
the flue O
levels. Too much FGR may induce high levels of
2
CO in the flue gas. It may be necessary to adjust the O
proper low fire values.
Once the low fire setting is complete, continue throughout the
firing range, adjusting the FGR at each point, to obtain the
proper NOx values. Verify the values modulating back to low
fire, and adjust accordingly.
Profire EV/LNEV Burner
Caution
Caution
750-364
to
2
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