Raypak 992B Boiler User Manual


 
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APPENDIX
Inside Air Contamination
All heaters experience some condensation during
start-up. The condensate from flue gas is acidic.
Combustion air can be contaminated by certain vapors
in the air which raise the acidity of the condensate.
Higher acidity levels attack many materials including
stainless steel, which is commonly used in high effi-
ciency systems. The heater can be supplied with
corrosion-resistant, non-metallic intake air vent materi-
al. 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 infiltration 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/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 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 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