Air Openings - Weil-McLain EG Manual

EG PEG EGH
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Prepare the location

Air openings

Provide adequate combustion and ventilation air
to assure proper combustion and reduce the risk
of severe personal injury, death or substantial prop-
erty damage caused by flue gas spillage and carbon
monoxide emissions.
Combustion air and ventilation openings must comply with
the National Fuel Gas Code, ANSI Z223.1 – latest edition, or ap-
plicable local building codes. Canadian installations must comply
with B149.1 or B149.2 Installation Codes.
Air opening sizes in the following are given in free area (after
correction for louver obstruction).
Option 1 — Provide (2) openings:
Option 2 — Provide (1) opening:
A single combustion air opening can be used, provided:
• The
opening must commence within 12 inches of the
• The boiler must have clearances of at least 1 inch from both
sides and back, and 6 inches from the front.
• The opening must connect directly to the outdoors or to a
space that communicates directly to the outdoors.
• The air can be provided through a direct opening or through
a horizontal or vertical duct.
• The free area of the opening must be at least equal to the sum
of all vent connectors in the space.
• The free area of the opening must be at least 1 square inch
per 3000 Btu/hr input rating of all equipment located in the
space.
8
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Gas firEd boilErs
ceiling.
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sEriEs boilEr manual
Tight construction — Definition:
Tight construction means (per ANSI Z223.1):
• Walls and ceilings exposed to the outside atmosphere have a
continuous water vapor retarder with a rating of 1 perm or
less with openings gasketed. AND
• Weather-stripping has been added on openable windows
and doors. AND
• Caulking or sealants are applied to areas such as joints around
windows and door frames, between sole plates and floors, be-
tween wall-ceiling joints, between wall panels, at penetrations
for plumbing, electrical, and gas lines, and in other openings.
Tight construction requirements
If building is of tight construction and air is taken from inside
the building, provide two openings in building outside wall, one
within 12 inches of ceiling, the other within 12 inches of the floor.
Each opening must have a minimum free area of 1 square inch
per 1,000 Btuh of all appliances in the building.
Exception
NO combustion air openings are needed when the boiler (and
other appliances) are installed in a space with a volume NO LESS
than 50 cubic feet per 1,000 Btuh of all installed appliances. Sum
the total input of all appliances in MBH (1,000's of Btuh) and
multiply this number times 50. Building must not be of Tight
construction (see above).
Example: For total input of 100 MBH (100,000 Btuh), minimum
volume is 50 x 100 = 5,000 cubic feet. At a ceiling height of 8 feet,
space must have at least 5,000 ÷ 8 = 625 square feet (25 feet x 25
feet, for instance).
Exhaust fans and air movers
The appliance space must never be under a negative pressure.
Always provide air openings sized not only to the dimensions
required for the firing rate of all appliances, but also to handle
the air movement rate of the exhaust fans or air movers using air
from the building or space.
Motorized air dampers
If the air openings are fitted with motorized dampers, electrically
interlock the damper to:
• Prevent the boiler from firing if the damper is not fully open.
• Shut the boiler down should the damper close during boiler
operation.
To accomplish this interlock, wire an isolated contact (proving the
damper open) in series with the thermostat input to the boiler.
The boiler will not start if this damper is closed, and will shut
down should damper close during operation.
Placement and setup
Place boiler/crate near position
1. Leave boiler in crate and on pallet until installation site is
ready.
2. Move entire crate and pallet next to selected location.
3. Remove crate. Leave boiler on pallet.
4. Unbolt boiler from pallet.
5. Remove boiler from pallet.
Part Number 550-110-639/0512