Weil-McLain GV Series 3 - Manual (Page 2)

Part number 550-110-266/0601 2
GOLD GV Series 3 & 4 — Z-Vent II Venting Supplement
Combustion air supply
Table 1 Corrosive contaminants
Special note
Refer to GV Boiler Manual for sizing free area of combustion/ventilation air openings.
All boilers experience some condensation in section assembly during start-up. Unlike most conventional boilers,
condensation is minimized in the GV Boiler by a built-in mixing system, maintaining boiler return water
temperature above 130
0 F, during steady state operation.
Flue gas condensate is slightly acidic. In most cases pH level is not harmful to vents or drains. When combustion
air is contaminated by vapors from products and areas, listed in Table 1 below, condensate acidic levels increase.
Higher acidic levels attack many materials, including stainless steel commonly used in high efficiency systems.
You may choose to use outside combustion air for any of the following reasons:
•
Installation is in an area containing contaminants listed in Table 1 below, which will induce acidic
contamination.
• You want to reduce infiltration into your home through openings around windows and doors.
Products to avoid Areas likely to have contaminants
Spray cans containing chloro/fluorocarbons Dry cleaning/laundry areas and establishments
Permanent wave solutions Swimming pools
Chlorinated waxes/cleaners Metal fabrication plants
Chlorine-based swimming pool chemicals Beauty shops
Calcium chloride used for thawing Refrigeration repair shops
Sodium chloride used for water softening Photo processing plants
Refrigerant leaks Auto body shops
Paint or varnish removers Plastic manufacturing plants
Hydrochloric acid/muriatic acid Furniture refinishing areas and establishments
Cements and glues New building construction
Antistatic fabric softeners used in clothes
dryers Remodeling areas
Chlorine-type bleaches, detergents, and clean-
ing solvents found in household laundry rooms Garages with workshops
Adhesives used to fasten building products and
other similar products
To prevent the potential of severe personal injury or death, check for areas and products listed
above before installing boiler. If found:
• remove products permanently — OR —
• provide outside combustion air