We suggest using a double-acting control on units where fuels are frequently changed. Dual Fuel Appliances Burners capable of burning either gaseous fuels or oil should be equipped with a barometric draft control.A barometric draft control will help eliminate this undesirable stack action and permit the unit to be pressurized. Forced Draft Burner Forced Draft installed with a stack height in excess of 30' will probably develop excessive natural draft, reducing the amount of pressure within the furnace or boiler.

While a draft hood (diverter) is often used on gas units fired with an atmospheric burner, a double-acting barometric draft control should be used for furnaces or boilers fired with power burners. A single acting draft control for oil maintains that negative pressure. A power burner designed to burn natural or LP gas operates in the same manner. Power Burners A power burner is designed so that a fan delivers negative air pressure to the combustion chamber.Use a single acting control for oil, and a double-acting control for gas-fired equipment with a draft induced system Use a single-acting control for oil and gas-fired equipment with a power vented system. These fluctuations can be negated by the use of a barometric draft control located between the draft inducer or power venter and the furnace, boiler, or water heater it services. Draft Inducers/Power Venters With these devices, draft is increased or created, causing fluctuations in air flow through the combustion chamber.

Calibrated draft control type rc