Raypak 503-2003 Installation And Operating Instructions Manual

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Raypak 503-2003 Installation And Operating Instructions Manual Manual pdf 55 page image

53Inside Air ContaminationAll heaters experience some condensation during start-up. The condensate from flue gas is acidic. Combustionair can be contaminated by certain vapors in the airwhich raise the acidity of the condensate. Higher acid-ity levels attack many materials including stainlesssteel, which is commonly used in high efficiency sys-tems. The heater can be supplied with corrosion-resistant, non-metallic intake air vent material. Youmay, however, choose to use outside combustion airfor one or more of these reasons:1. Installation is in an area containing contaminantslisted below which will induce acidic condensation.2. You want to reduce infiltration into your buildingthrough openings around windows and doors.3. You are using AL29-4C stainless steel vent pipe,which is more corrosion-resistant than standardmetallic vent pipe. In extremely contaminated ar-eas, 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• antistatic fabric softeners used in clothes dryers• chloride-type bleaches, detergents, and cleaningsolvents found in household laundry rooms• adhesives used to fasten building products• similar products.Areas where contaminated combustion air commonlyexists:• dry cleaning/laundry areas• 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 areas• open pit skimmers.Check for areas and products listed above before in-stalling heater. If found:• remove products permanently, OR• install TruSeal direct vent.SECTION HAppendix

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