American Standard Standard Residential, Руководство по эксплуатации, установке и обслуживанию

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4
Important air for combustion and ventilation must not come from a
corrosive atmosphere. Any failure due to corrosive elements in the
atmosphere is exclude from warranty coverage.
The following types of installation
(not limited to the following)
will require
outdoor air for combustion due to chemical exposure and may reduce
but not eliminate the presence of corrosive chemicals in the air.
• Beauty shops.
• Photo processing labs.
• Buildings with indoor pools.
• Water heaters installed in laundry, lobby, or craft rooms.
• Water heaters installed in chemical storage areas.
Combustion air must be free of acid-forming chemicals such as
sulfur, fluorinem chlorine. These elements are found in aerosol sprays,
detergents, bleaches, cleaning solvents, air fresheners, paint and varnish
removers, refrigerants, and many other commercial or household
products. When burned, vapors from these products form highly
corrosive acid compounds. These products should not be stored or
used near water heater or air inlet.
Combustion and ventilation air requirementes are determined by the
location of the water heater. The water heater may be located in either
an open
(unconfined)
area or in a confined area or small enclosure, such as
a closet or small room. Confined spaces are areas with less than 50 sq.
ft.
ALL AIR
FROM
INSIDE THE
BUILDING
The confined space shall be provided with two permanent openings
communicating directly with an additional room(s) of sufficient volume
so that the combined volume of all spaces meets the criteria for an
unconfined space shall be considered in making this determination. Each
opening shall hace a minimum free area of 1 square inch pero 1,000
BTU per hour of the total input rating of all gas utilization equipment in
the confined space, but not less than 100 square inches.
The confined space shall be provided with
two permanent openings, one commencing
within 12 inches of the top and one
commencing within 12 inches of the
bottom of the enclosure. The openings shall
communicate directly, or by ducts, with the
outdoors or space
(crawl or attic)
that freely
communicate with the outdoors.
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.
(Figure 6)
When communicating with the outdoors
through vertical ducts, each openings shall
have a minimum free area of 1 square per
inch per 4,000 BTU per hour of total input
rating of all equipment in the enclosure.
(Figure 7)
1. When communicating with the outdoors
through horizontal ducts, each duct opening
shall have a minimum free area of 1 square
inch per 2,000 BTU per hour of total input
rating of all equipment in the enclosure.
(Figure 8)
When ducts are used, the shall be of the
same cross-sectional area as the free area
of the openings to which they connect. The
minimum dimension of rectangular air ducts
shall not be less than 3 inches. For other
combustion and ventilation air openings,
refer to the National Fuel Gas Code ANSI
Z223.1.*
Water
Heater
12" MAX
CHIMNEY OF GASVENT
12" MAX
MIN
MIN
AIR DUCT
100 sq in
100 sq in
Opening
Fig. 5
AIR SUPPLY
ALL AIR
FROM
OUTDOORS
ONE OPENING SHALL BE WITHIN
12 INCHES OF THE TOP AND ONE
WITHING 12 INCHES OF THE BOTTOM
OF THE ENCLOSURE.
VENTILATION
LOUVERS
(EACH END OF ATTIC)
VENTILATION
LOUVERS
(EACH END OF ATTIC)
ALT. INLET
AIR
AIR OUTLET
AIR OUTLET
WATER HEATER
WATER HEATER
FURNACE
FURNACE
INLET AIR DUCT
INLET FT AIR
DUCT
ENDS 1”
ABOVE FLOOR
VENTILATION LOUVERS