![]() In this system, one of the fans is selected to control the combustion air to suit the fuel feed and the other is assigned to take care of the proper furnace draft.įinally, all this is necessary to maintain a continuous supply of air through the fire bed for proper combustion of fuel and to exhaust the flue gases to the atmosphere after their energy content is given at the required region.įor efficient control and monitoring purposes, fairly accurate measurement of drafts at various places as mentioned above is very important. In boilers using the balanced draft technic, slight negative pressure is maintained at a furnace. This combination of FD, SA, and ID fans is called balanced draft fans. Secondary Air Draft for a high-pressure boiler.Ĭombustion air to steam boilers is supplied (force draft) through FD fan & Secondary air fan (pressure fan at the inlet of boiler) or using ID fan (suction fan at boiler Chimney) or by using both FD, SA, and ID fans. ![]() ID Fan Inlet (Range between -140 to -150 mmwc). Air heater Outlet (Flue Gas) about -100 mmwc. Economizer Outlet ranging between -70 to -80 mmwc.į. Boiler Outlet (Flue Gas) about -30mmwc.Į. Furnace Draft (It should be ideally zero but kept slightly negative, the measuring range required is +/- 50mmwc)ĭ. Air Heater outlet (Hot Air, usually between +130 to +140).Ĭ. FD fan outlet (Cold Air)/Air heater inlet (The usual range is about 150 to 200mmwc).ī. There are different points of measurement of boiler drafts & it’s approx. It is thus extremely important to measure and control the boiler drafts. Uncontrolled draft causes poor, non-efficient operation of a furnace (poor combustion efficiency), unstable pilot flame, build-ups of highly toxic gases like carbon monoxide, soot accumulation due to varying air-fuel ratio. Measuring and controlling the furnace draft is important for two reasons. Here we are talking about Boiler applications. In two main applications draft measurement and control is essential. This signal, in turn, is amplified to standard values like 4 – 20 mA, 0 – 5.0 Volts, etc., and then used for display as well as control.Īpplications of Draft Measurement and control: It is measured with the help of a transducer that converts this small differential pressure to a small electrical signal. The word draft is usually used for very low-pressure differentials up to 1000 mmwc. Overall size (W x D x H) 23.5" x 25" x 49.Draft means a difference in pressure or differential pressure. Optional insulation/sheet metal cabinet.Optional 4-gallon per minute domestic water coil.3/4" fitting for Samson draft regulator.3/4" NPT fitting for ASME pressure relief valve.1/2" NPT fitting for temperature pressure gauge.Heavy duty cast iron grate system with external shaker handle. ![]() All boilers are designed with the best cast iron grate system and built to last. Constructed from 1/4" steel, this Aqua-Gem boiler easily maintains water temperature and features a large capacity ash pan. Each unit is pressure tested to 120 PSI and has a powerful heat exchanger for maximum efficiency. Our boilers circulate water in the front to prevent cracking. It works well with new or existing oil or electric boilers. This hydronic system requires no electricity to heat water for floor heating, baseboard, freestanding radiators, heat pumps, or domestic water.
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