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Combustion and Ventilation Air- Provisions must be made for adequate combustion and ventilation air. Details outlining proper air supply
for various types of installation are prescribed by the National Fuel Gas Code (ANSI Z-223.1/ NFPA 54) latest edition. If the water heater is installed
in unconfined space within the building, infiltration air may be adequate for proper combustion and ventilation. Buildings of tight construction
(weather stripping, caulked, etc.) require additional air from outdoors.
If the water heater is installed in a confined space (volume is less than 50 cu. ft. per I000 BTUH of the total input rating of all gas appliances in that
space), air must be supplied through two permanent openings. One opening shall be within 12 inches from the top of the enclosure and one within
12 inches of the bottom. The openings must be protected by metal louvers or 1/4" min. mesh metal screen.
The size of the openings are as follows:
1.- lf the openings communicate directly with an additional room(s) of sufficient volume, each opening shall have a minimum free area opening of 1
sq. in. per 1000 BTUH of the total input rating of all gas appliances in the confined space, but not less than 100 sq. inches.
2.- If the openings communicate directly with the outdoors or through vertical ducts with the outdoors, each opening shall have a minimum free
area of I sq. in. per 4000 of the total rating of all gas appliances in the enclosure.
3.- If the openings communicate with the outdoors through horizontal ducts, each opening shall have a minimum free area of 1 sq. in. per 2000 BTUH
of the total rating of all gas appliances.
CAUTION
The draft diverter relief opening of the water heater and the combustion air inlet must be in the same atmospheric
pressure zone. Large exhaust fans in kitchens or other locations can lower the air pressure inside an enclosure and
interfere with proper operation and venting of the water heater. In these cases, the water heater should be installed
in a separate room with combustion and ventilation air supplied directly from outdoors as previously described.
Corrosive Atmosphere- Water heater corrosion and component failure can be caused by the heating and breakdown of airborne chemical
vapors. Spray can propellants, cleaning solvents, refrigeration and air conditioning refrigerants, swimming pool chemicals, calcium and sodium
chloride, waxes, and process chemicals are typical compounds which are potentially corrosive. These materials are corrosive at very low
concentration levels with little or no odor to reveal their presence.
Products of this sort must not be stored near the water heater, nor should air which is brought in contact with the water heater contain any of these
chemicals. Flammable vapors may be drawn by air currents from other areas of the structure to this appliance. If necessary, uncontaminated air
should be obtained from remote or outside sources.
THE WARRANTY ON THIS WATER HEATER DOES NOT COVER DAMAGE CAUSED FROM OPERATION IN A CORROSIVE
ATMOSPHERE.
Water Damage/Drain Pan- The water heater should be located in an area where leakage of the tank or connections
will not result in damage to the area adjacent to the water heater or to lower floors of the structure. WHEN SUCH
LOCATIONS CANNOT BE AVOIDED, A SUITABLE DRAIN PAN MUST BE INSTALLED UNDER THE WATER
HEATER HAVING A LENGTH AND WIDTH AT LEAST 3 INCHES GREATER THAN THE DIAMETER OF THE
WATER HEATER, A MAXIMUM HEIGHT OF 1-3/4 INCHES, AND BE PIPED TO AN OPEN DRAIN. DO NOT
RESTRICT THE FLOW OF COMBUSTION AIR.
5
DRAFTHOOD LOCATION
& FLUE DAMPER INSTALLATION
DAMPER CASTING
Figure 4
CONNECTORS
DRAIN PAN INSTALLATION AND CONSTRUCTION MUST CONFORM TO LOCAL CODES AND ORDINANCES.
IF NOT INSTALLED AND OPERATED IN ACCORDANCE WITH THESE INSTRUCTIONS, UNDER NO CIRCUMSTANCES WILL THE
MANUFACTURER OF THIS WATER HEATER BE LIABLE FOR ANY WATER DAMAGE OR INJURY IN CONNECTION WITH THIS WATER
HEATER.
VENTING
IMPORTANT NOTICE
This water heater may be installed as a replacement with venting that met the existing codes at the time of the
installation of the original water heater.
WARNING
The installer to check the installation for venting and for spillage all around the draft hood relief opening after five minutes of operation the method
to check for flue products spillage should utilize a flame or a match, or candle or smoke or flame form another source such a cigarette or grill lighter
wand. The procedure used should be to play the flame or smoke around the perimeter of the draft hood from the outside.
If spillage is encountered, it would be manifested by smoke escaping away from the draft hood or by the flame being extinguished while outside of
the hood. Good venting would be indicated by smoke and the flames being drawn into the draft hood.
Vent Size Model
ULN 75-76-AS, ULN 75-76-AS-R-6, ULN 75-76-AS-R-12
ULN 100-76-AS, ULN 100-76-AS-R-6, ULN 100-76-AS-R-12
RU 75-76-AS-6, RU 75-76-AS-12
RU 100-76-AS-6, RU 100-76-AS-12
ULN 100-83-AS, ULN 100-83-AS-R-6, ULN 100-83-AS-R-12
RU 100-83-AS-6, RU-100-83-AS-12
DRAFTHOOD
DAMPAR PLATE IN
OPEN POSITION
Vent Size
4 in
6 in
6
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