750-204
Profire D/LND
8-3
8.2 — Description
Oil input based on No. 2 Oil at 140,000 Btu/gal. and 60 Hz.
8.2 — Description
The Flue Gas Recirculation (FGR) system is designed to reduce NOx emissions from boilers retrofitted with Pro-
fire burners by adding a percentage of flue gas to the combustion process. A burner combustion air fan is used to
pull flue gas from the stack through the FGR duct and inject it into the combustion zone.
Typical sizing for the FGR ducts are shown in Figure 8-4. All FGR duct piping should be covered with a minimum
of 2” of insulation, and supported as required. The following controls are used in the FGR duct for safe operation
of the system.
Burner Size Max. Burner Oil Input U.S.G.P.H.
<30 ppm <20 ppm
42 P 24 --
54 P 30 24
63 P 38 30
84 S 45 38
84 P 53 45
105 P 60 53
145 S 75 60
145 P 90 75
175 P 105 90
210 P 120 105
252 P 150 120
300 P 180 150
315 P 215 N/A
336 P 225 N/A
378 P 240 N/A
420 P 270 N/A
NOTE: Check all burner and FGR wiring before operating the unit. Turn all power off when working with any wiring.
Power must be turned off at the disconnect to the boiler. Boiler operation and FGR adjustment must be done by a
qualified Cleaver-Brooks service representative.
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