Cleaver-Brooks Profire E Series, Установка, эксплуатация и обслуживание, Страница: 75 / 84

750-297
Profire E/LNE Series Manual 8-1
CHAPTER 8
LNE Series FGR System
8.1 — Description
The Profire Flue Gas Recirculation (FGR) system is designed to reduce NO
x
emissions from boilers retrofitted with
Profire 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.
FIGURE 8-1.
General Layout of the Burner
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.