ECR International AMB-4, Инструкция по применению

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PN 240013666 REV. A [06/30/2022]
1. Ventilation of the boiler room must be adequate to
provide suf1. ficient air to properly support combustion
per the latest revision of the National Fuel Gas Code,
ANSI Z223�1/ NFPA-54�
2.
When a boiler is located in an unconfined space in a
building or conventional construction frame, masonry
or metal building, infiltration normally is adequate to
provide air for combustion and ventilation� However,
if the equipment is located in a building of tight
construction (See the National Fuel Gas Code, ANSI
Z223�1) the boiler area should be considered as a
confined space. If there is any doubt, install air supply
provisions in accordance with the latest revision of the
National Fuel Gas Code�
3.
When a boiler is installed in an unconfined space, in a
building of tight construction, air for combustion and
ventilation must be obtained from outdoors or from
spaces freely communicating with the outdoors� A
permanent opening or openings having a total free area
of not less than 1 square inch per 5,000 BTU per hour
of total input rating of all appliances shall be provided�
Ducts may be used to convey makeup air from the
outdoors and shall have the same cross-sectional area
of the openings to which they are connected�
4. When air for combustion and ventilation is from inside
buildings, the confined space shall be provided with two
permanent openings, one starting 12 inches from the
top and one 12 inches from the bottom of the enclosed
space� Each opening shall have a minimum free area
of 1 square inch per one thousand (1000) BTU per
hour of the total input rating of all appliances in the
enclosed space, but must not be less than one hundred
(100) square inches� These openings must freely
communicate directly with other spaces of sufficient
volume so that the combined volume of all spaces
meets the criteria for an unconfined space. See Figure
#7.
5.
When the boiler is installed in a confined space and all
air is provided from the outdoors the confined space
shall be provided with one or two permanent openings
according to methods A or B� When ducts are used,
they shall be of the same cross sectional area as the
free area of the area of the openings to which they
connect� The minimum dimension of rectangular air
ducts shall be not less than 3 x 3 inches or 9 square
inches�
A� When installing two openings, one must commence
within A� 12 inches from the top and the other
within 12 inches from the bottom of the enclosure�
The openings shall communicate directly, or by
ducts, with the outdoors or spaces (crawl or attic)
that freely communicate with the outdoors� One
of the following methods must be used to provide
adequate air for ventilation and combustion�
i� When directly communicating with the
outdoors, each opening shall have a minimum
free area of 1 square inch per 4,000 BTU per
hour of total input rating of all equipment in
the enclosure� See Figure #8.
ii� When communicating with the outdoors by
means of verII� tical ducts, each opening shall
have a minimum free area 1 square inch per
4,000 BTU per hour of total input rating of all
appliances in the enclosed space�
iii� If horizontal ducts are used, each opening
and duct shall III� have a minimum free area
1 square inch per 2,000 BTU per hour of total
input rating of all appliances in the enclosed
space�
B� One permanent opening, commencing within
12 inches of the top of the enclosure, shall be
permitted where the equipment has clearances
of at least 1 inch from the sides, 1 inch from the
back, and 6 inches from the front of the boiler�
The opening shall directly communicate with the
outdoors or shall communicate through a vertical or
horizontal duct to the outdoors or spaces (crawl or
attic) that freely communicate with the outdoors�
The openings must have a minimum free area of 1
square inch per 3000 Btu per hour of the total input
rating of all equipment located in the enclosure�
The free area must be no less than the sum of the
areas of all vent connectors in the confined space.
6.
In calculating free area using louvers, grilles or screens
for the 6� above, consideration shall be given to their
blocking effect. Screens used shall not be smaller than
¼ inch mesh� If the free area through a design of
louver or grill is known, it should be used in calculating
the size opening required to provide the free area
specified. If the design and free area is not known, it
may be assumed that wood louvers will have 20-25%
free area and metal louvers and grilles will have 60-
75% free area. Louvers and grilles should be fixed in
the open position or interlocked with the boiler so they
are opened automatically during the boiler operation�
Ventilation and Combustion