Improper Venting. The water heater, though, was a big polluter. If we run oil fired heating equipment too hot, to produce "zero" soot, we're sending too much heat (and money) up the chimney. Reduce outdoor dirt entry by sealing the house (ie, caulking, weatherstripping, new windows). We wiped these surfaces clean and even vacuumed every thing in sight each time the boiler was serviced. But over that year, other major problems in the house threw me, and several others working on the case, off the track. U.S. Patent 4,183,399, issued January 15, 1980. Filter the air through a ventilation systems, like an air-to-air heat exchanger. This is a sign that mineral salts are coming through the masonry because too much moisture is inside the chimney. This gentleman looked like he knew his stuff. By chance, I wandered around behind two vehicles parked in the garage. Excessive soot: Soot is a problem that can occur with gas-fired and oil furnaces. Soot and rust flakes covered the top of the heater inside the metal cage, and there were black soot particles on top of a nearby plastic water softener tank. That was the case for this system. One of the combustion byproducts is carbon, the primary ingredient in black soot, which is sent up the heat exchanger and out of the house. In comparison, the furnace exhaust on Donna's house registered 20 ppm. I checked the pilots on the dryer and range; both were burning normally and showed no signs of soot. what causes soot buildup in the heat exchanger and vent quizlet, A shell-and-tube heat exchanger with one shell pass and 20 tube passes uses hot water on the tube side to heat oil on the shell side. Soot coming from an oil fired heater warns of improper operation and risks a destructive puffback. Smoke pipe dampers, if any, shall be such that they cannot close off more than 80 percent of The wrong mixture of air and gas is the cause of soot produced by a hot water heater. I was in love again, this time with a novel explanation for soot in a home. Poor ventilation for the burners or a restricted vent can also cause sooting. He walked outside the house, sampled the rocks by the foundation, looked up into the trees, wiped tissues along the house siding. And since this is an open front model, this can be entering into your living spaces. In some cases, you'll find discoloration on the heat exchanger. I suggested that Donna and Jim park their cars outside for a while to see if that cured the house. These conditions should be investigated further by a service technician. So a modest amount of soot accumulation in the boiler, furnace, or flue vent connector is normal between annual service calls. A shop vac will probably not complete this job. The most logical reason would be a cracked or broken heat exchanger (not all that unusual for a newer furnace). If left, you will probably have a puffback. Zolton Cohen is a building inspector and journalist in Kalamazoo, Michigan. (Excellent tips on spotting problems on oil-fired heating equipment. Â© Home Energy Magazine 2020, all rights reserved. (Caution – sealing the house can cause downdrafting problems unless new heating appliances are installed). The gas clothes dryer was venting normally. Donna called back a month later. U.S. Patent 4,050,628, issued September 27, 1977. As I've since learned, automobile engines are perhaps the most potent source of CO in or around a house. In that case not only is soot being produced but so are exhaust fumes, which are a … To rule out other pollutant sources, I asked about lifestyle habits. But where from? Any combustibles too close to a hot metal flue or chimney could catch on fire at this temperature. Here are some of the leading causes of cracks in heat exchangers. It appeared that air was carrying soot into the house. I can peg the needle of my CO detector at 2,000 ppm in the tailpipe of any car. Soot in the combustion chamber can be caused by misaligned burners, too, where the flame is touching the chamber side and cooling the flame. The stains were even getting onto the clothes in the closets. prevent excessive draft. Often when cracks are present in a heat exchanger, soot from the combustion process will seep through and discolor the metal. 4 reasons a soot smell is bad news: 1) Soot is the result of incomplete combustion, meaning that your furnace isn’t burning the gas properly or efficiently. I was in love with my discovery. Are passive flue gas heat recovery devices savers? And have it serviced promptly spit out 162 ppm of CO on start-up before the came. Show or Hide Citations & references, home INSPECTION EDUCATION COURESES ( Canada ), clean,... 'D pinned the problem those of the CO -- was coming from reached at contact. 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