Lots of companies make draft gauge measurement devices, including Bachrach™, and including nice little pocket units that anyone can carry. We do not measure draft in the flue vent connector past the barometric damper since the damper is regulating the draft and we're not seeing what the oil burner is seeing at the fire. Pressure - which is often a problem on residential heating systems since few of them are designed to work this way. If theīreech draft is too low the combustion process and venting process may be inadequate, and if the draft measured in theīreech is lower than the draft measured over the fire, the oil burner and combustion chamber are operating under In the breech we want to see about -0.05 inches WC pressure.
This sketch of a barometric damper used on oil fired heating equipment (heating boilers or water heaters) is provided courtesy of Carson Dunlop Associates. The gas pressure in the chimney needs to be less than atmospheric pressure in the boiler room for gases to leave. Notice that we're using negative numbers for draft measurement - that's because gases in the flue are moving up, up, and away, like superman, and onwards out of the building - away from the heating equipment. Where do we Measure Chimney or Flue Draft & What is the Correct Draft Measurement at Oil Fired Heaters?ĭraft at two locations: over the fire or in the combustion chamber where typically we may see -0.02 to -0.03 inches of water column pressure,Īnd in the breech or at the stack pipe (properly, the flue vent connector) measured just a few inches above the boiler orįurnace top, and before the barometric damper itself. Without this regulation (hence the term "draft regulator") as building and outdoor conditions vary (wind, doors open or shut, temperature etc), the draft seen by the heating appliance will vary, making maintenance of proper combustion conditions at the oil burner impossible.Ī typical draft regulator is deceptively simple: The hinged door opens or closes to let extra air into the flue to assure that the draft in the flue remains constant at the proper setting needed for proper heating system operation.ĭetails about draft control for gas fired heating systems, including LP or natural gas fueled furnaces or boilers, are discussed separatelyĪt DRAFT HOOD, GAS HEATER On gas fired equipment. Where & How Do We Measure Chimney Draft or Heating Appliance Flue Draft?Īs we explain at our home page for this topic,Ī barometric draft control, also called a "damper" or barometric damper, is a hinged, weighted door on an opening at a heating flue.īarometric dampers are used on oil-fired heating appliances (furnaces, boilers, water heaters) to assure constant draft and thus uniform combustion. We also provide an ARTICLE INDEX for this topic, or you can try the page top or bottom SEARCH BOX as a quick way to find information you need.
#OIL BURNER DRAFT CONTROL HOW TO#
We describe how to inspect, troubleshoot and repair heating and air conditioning systems to inform home owners, buyers, and home inspectors of common heating system defects.
#OIL BURNER DRAFT CONTROL SERIES#
This article series answers most questions about central heating system troubleshooting, inspection, diagnosis, and repairs. This article explains the methods of measurement and proper adjustment settings for draft regulators or barometric dampers on oil fired heating equipment. How to measure draft at heating equipment or at chimneys. We have no relationship with advertisers, products, or services discussed at this website. InspectAPedia tolerates no conflicts of interest.
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