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Series 3
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 fl ooring 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
fl oor to avoid contact with gasoline fumes.
Foundation
Provide a level concrete, masonry or cement block
foundation if the fl ooring could become fl ooded or is
not level. See Table 1 for foundation size required.
Table 1
Model
UO-3E
UO-4E
UO-5E
Air openings for combustion and
ventilation air
Natural infi ltration
Older buildings with single-pane windows, minimal
weather-stripping and no vapor barrier often provide
enough natural infi ltration and ventilation without
dedicated openings.
Tight construction
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 infi ltration and
ventilation.
Part number 550-142-182/1014
— Boiler Manual
WATER BOILER
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 fl ue gas leakage and carbon
monoxide emissions.
Do not install exhaust fan in boiler room.
(continued)
Follow code requirements
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 confi ned room (defi ned by NFPA 31 as
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 fl oor. 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 infi ltration from
outside. Each opening should be at least 140 sq. in. per
(inches)
1 GPH input (1 sq. in. per 1000 Btu input) of all fuel-
burning appliances plus requirements for any equip-
2
ment that can pull air from room (including clothes
2
dryer and fi replace).
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-
tic 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 (includ-
ing clothes dryer and fi replace).
•
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 fi replace).
•
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 equip-
ment to prove open before boiler operation.
9
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