4
Part Number 550-110-832/1014
OWB & OWT
Series 2
Oil-Fired Water Boilers –
Boiler Manual
To prevent potential of severe personal injury or
death, check for products or areas listed below
before installing boiler. If any of these contaminants
are found:
• remove contaminants permanently.
— OR —
• isolate boiler and provide outside combustion air.
See national, provincial or local codes for further
information.
Please review the following information on potential combustion
air contamination problems.
See Table 2 for products and areas which may cause contaminated
combustion air.
1 Prepare boiler location
continued
Air contamination
Air for combustion and ventilation
Adequate combustion and ventilation air:
• Assures proper combustion.
• Reduces risk of severe personal injury or death from
possible flue gas leakage and carbon monoxide
emissions.
• Do not install exhaust fan in boiler room.
Consider building construction
Older buildings with single-pane windows, minimal weather-
stripping and no vapor barrier often provide enough natural
infiltration and ventilation without dedicated openings.
New construction or remodeled buildings are most often built
tighter. Windows and doors are weather-stripped, vapor barriers
are used and openings in walls are caulked. As a result, such
tight construction is unlikely to allow proper natural air infiltration
and ventilation.
Follow state, provincial or local codes when sizing adequate
combustion and ventilation air openings. In absence of codes,
use the following guidelines when boiler is in a confined room
(defined by NFPA 31 as less than 7200 cubic feet per 1 GPH
input of all appliances in area. A room 8 ft. high x 30.0 ft. x 30.0
ft. is 7200 cu. ft.).
Provide two permanent openings:
One within 12 inches of ceiling, one within 12 inches of floor.
Minimum height or length dimension of each rectangular opening
should be at least 3 inches.
When inside air is used:
Each opening must freely connect with areas having adequate
infiltration from outside. Each opening should be at least 140 sq.
in. per 1 GPH input (1 sq. in. per 1000 Btu input) of all fuel-burning
appliances plus requirements for any equipment that can pull air
from room (including clothes dryer and fireplace).
When outside air is used:
Connect each opening directly or by ducts to the outdoors or to
crawl or attic space that freely connects with outdoors. Size per
below:
• Through outside wall or vertical ducts — at least 35 sq. in. per
1 GPH input (1 sq. in. per 4000 Btu input) of all fuel burning
appliances plus requirements for any equipment that can pull
air from room (including clothes dryer and fireplace).
• Through horizontal ducts — at least 70 sq. in. per 1 GPH
boiler input (1 sq. in. per 2000 Btu input) of all fuel-burning
appliances plus requirements for any equipment that can pull
air from room (including clothes dryer and fireplace).
• Where ducts are used, they should have same cross-
sectional area as free area of openings to which they connect.
Compensate for louver, grille or screen blockage when
calculating free air openings. Refer to their manufacturer’s
instructions for details. If unknown, use:
• Wood louvers, which provide 20-25% free air.
• Metal louvers or grilles, which provide 60-75% free air.
Lock louvers in open position or interlock with equipment to
prove open before boiler operation.
Table 2
Corrosive contaminants and likely locations
Products to avoid
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
Chlorine-type bleaches, detergents, and cleaning solvents
found in household laundry rooms
Adhesives used to fasten building products and other similar
products
Areas likely to have contaminants
Dry cleaning/laundry areas and establishments
Swimming pools
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
Garages with workshops
