APPENDIX
Inside Air Contamination
All heaters experience some condensation during
start-up. The condensate from ue gas is acid-
ic. Combustion air can be contaminated by certain
vapors in the air which raise the acidity of the con-
densate. Higher acidity levels attack many materials
including stainless steel, which is commonly used in
high eciency systems. The heater can be supplied
with corrosion-resistant, non-metallic intake air vent
material. You may, however, choose to use outside
combustion air for one or more of these reasons:
1. Installation is in an area containing contaminants
listed below which will induce acidic condensation.
2. You want to reduce inltration into your building
through openings around windows and doors.
3. You are using AL29-4C stainless steel vent pipe,
which is more corrosion-resistant than standard
metallic vent pipe. In extremely contaminated
ar-eas, this may also experience deterioration.
Products causing contaminated combustion air:
• spray cans containing chloro/uorocarbons
• 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 cleaning
solvents found in household laundry rooms
• adhesives used to fasten building products
• similar products
Areas where contaminated combustion air commonly
exists:
• dry cleaning/laundry areas
• metal fabrication plants
• beauty shops
• refrigeration repair shops
• photo processing plants
• auto body shops
• plastic manufacturing plants
• furniture renishing 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 perma-
nently.
49
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