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WATER BOILER
Prepare boiler location
Flooring and foundation
Flooring
1. Install on any level, properly-supported, and non-
carpeted surface. Flooring may be combustible if
boiler leveling legs are installed.
2. Ensure the flooring is capable of handling the boiler
weight (see page 39 for weight and water volume).
Residential garage installations
Install boiler so the burner is at least 18 inches above the
floor to avoid contact with gasoline fumes.
Foundation
Provide a level concrete, masonry or cement block
foundation if the flooring could become flooded or is
Model
UO-3
UO-4
UO-5
Air openings for combustion and
ventilation air
Natural infiltration
weather-stripping and no vapor barrier often provide
enough natural infiltration and ventilation without
dedicated openings.
Tight construction
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.
Part number 550-141-986/0112
— Boiler Manual
Boiler foundation size (when req'd)
Length
Width
Height, min.
(inches)
(inches)
49
23
53
23
57
23
Adequate combustion and ventilation air
ensures proper combustion and 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.
(continued)
Follow code requirements
adequate combustion and ventilation air openings. In
absence of codes, use the following guidelines when
less than 7200 cubic feet per 1 GPH input of all appli-
ances in area. A room 8 ft. high x 33.5 ft. x 33.5 ft. is
7200 cu. ft.).
Provide two permanent openings
Provide two permanent openings — one within 12
inches of ceiling, one within 12 inches of floor. Mini-
mum height or length dimension of each rectangular
opening should be at least 3 inches.
Air from inside the building
When inside air is used — each opening must freely
connect with areas having adequate infiltration from
(inches)
outside. Each opening should be at least 140 sq. in. per
1 GPH input (1 sq. in. per 1000 Btu input) of all fuel-
2
burning appliances plus requirements for any equip-
ment that can pull air from room (including clothes
2
dryer and fireplace).
2
Air from outside the building
When outside air is used — connect each opening
directly or by ducts to the outdoors or to crawl or at-
below:
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 (includ-
ing clothes dryer and fireplace).
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).
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 equip-
ment to prove open before boiler operation.
9
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