Raypak 751 Installation And Operating Instructions Manual

Also see for 1001: OPERATING AND INSTALLATION Manual

Raypak 751 Installation And Operating Instructions Manual Manual pdf 54 page image

54APPENDIXInside Combustion AirContamination:All boilers experience some condensation during start-up. The condensate from flue gas is slightly acidic. Inmost cases the pH level is not harmful to vents ordrains. When combustion air is contaminated byvapors from products in areas listed below, the acidiclevels in the condensate increase. Higher acidic levelsattack many materials, including stainless steel com-monly used in high efficiency systems.The ADB can use special corrosion-resistant non-metallic vent material. You may, however, choose touse outside combustion air for one or more of thesereasons:• installation is in an area containing contaminantslisted below which will induce acidic condensation.• you want to reduce infiltration into your buildingthrough openings around windows and doors.• you are using AL29-4C stainless steel vent pipe,which is more corrosion-resistant than standardmetallic vent pipe. In extremely contaminatedarea, this may also experience deterioration.Products causing contaminated combustion air:• spray cans containing chloro/fluorocarbons• permanent wave solutions• chlorinated waxes/cleaners• chlorine-based swimming pool chemicals• calcium chloride used for thawing• sodium chloride used for water softening• refrigerant leaks• paint or varnish removers• hydrochloric acid/muriatic acid• cements and glues• anti-static fabric softeners used in clothes dryers• chloride-type bleaches, detergents, and cleaningsolvents found in household laundry rooms• adhesives used to fasten building products• ... and other similar productsAreas causing contaminated combustion air:• dry cleaning/laundry areas and establishments• metal fabrication plants• beauty shops• refrigeration repair shops• photo processing plants• auto body shops• plastic manufacturing plants• furniture refinishing areas and establishments• new building construction• remodeling areasCheck for areas and products as listed above beforeinstalling boiler. If found:• remove products permanently, OR• provide outdoor combustion air

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