Raypak 750 Boiler User Manual


 
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APPENDIX A
INSIDE COMBUSTION AIR CONTAMINATION:
All boilers experience some condensation during start-up.
The condensate from flue gas is slightly acidic. In most cases the pH level is not harmful to vents or drains. When
combustion air is contaminated by vapors from products in areas listed below, the acidic levels in the condensate increase.
Higher acidic levels attack many materials, including stainless steel commonly used in high efficiency systems.
The boiler can use special corrosion-resistant nonmetallic vent material. You may, however, choose to use outside com-
bustion air for one or more of these reasons:
installation is in an area containing contaminants listed below which will induce acidic condensation.
you want to reduce infiltration into your building through openings around windows and doors.
you are using AL29-4C stainless steel vent pipe, which is more corrosion-resistant than standard metallic vent
pipe. In extremely contaminated area, 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 cleaning solvents found in household laundry rooms
adhesives used to fasten building products
... and other similar products.
Areas 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 areas.
Check for areas and products as listed above before installing boiler. If found:
remove products permanently, OR
provide outdoor combustion air.