ACCESS COMBUSTION, LLC
WARNING:
Only authorized burner service personnel should start, adjust, or service this equipment!
Rev. 05
Page 4 of 19
Section II: Burner Overview
Fuel Gas Inlet
Pilot Gas Inlet
Combustion Blower
Flame Scanner Port
Observation Port
Burner Front Plate
Access Combustion Model B, Package Forced Draft Burner utilizes stage fuel design and with flue gas
recirculation (FGR) achieves Ultra-Low NOx emissions and near zero CO emissions when corrected to 3% O2.
Fuel is delivered to the burner via the gas inlet pipe and is mixed with air inside the burner housing. Portion of
the fuel is forced into the center of the diffuser. Remaining gas is forced into fuel nozzles where some is
partially premixed with air around the diffuser and/or forced into the combustion chamber tangent to the flame
envelope. The mixture is ignited downstream of the diffuser using internally located gas/electric pilot system.
The pilot is located inside the burner housing. The diffuser is a stainless-steel mixing device. The angle of the
diffuser blades forces the air to exit the diffuser with a spinning motion. The spinning air flow is mixed with gas
and is anchored by the turbulence generated by the diffuser. For Ultra-Low NOx emissions FGR can be added
to the combustion air. FGR dilutes the air with additional N2 and CO2. The additional N2 and CO2 lowers flame
temperature and the corresponding NOx emissions. FGR is delivered via FGR damper and is mixed with
combustion air stream in the combustion blower.
The burner is design to operate in a fire-tube and/or water-tube boiler application, as well as helical coil or
sealed combustion heat exchangers.
Burner housing
Air Inlet Damper
FGR Damper
