12
Installation Instructions continued-
Location
WARNING
KEEP APPLIANCE AREA CLEAR AND FREE OF COMBUSTIBLE MATERIALS, GASOLINE AND OTHER
FLAMMABLE VAPORS AND LIQUIDS.
This water heater must be located in an area where the general public does
NOT
have access to set temperatures.
Air Requirements
1. Do
NOT
obstruct the flow of combustion and ventilating air.
2. For safe operation, adequate air is needed for combustion and ventilation. Sooting may result in serious damage
to the water heater and risk of fire or explosion. It can also create a risk of asphyxiation. Such a condition will
often result in a yellow, luminous burner flame, causing carboning or sooting of the combustion chamber, burner,
and flue tubes.
Mechanical Exhausting Of Room Air
WARNING
Where an exhaust fan is installed in the same room with this water heater and combustion air is drawn from
inside the room, sufficient openings for air must be provided in the walls. UNDERSIZED OPENINGS WILL
CAUSE AIR TO BE DRAWN INTO THE ROOM THROUGH THE WATER HEATER
’S VENTING SYSTEM,
CAUSING POOR COMBUSTION THAT MAY BE HAZARDOUS TO LIFE. SOOTING MAY RESULT IN SERIOUS
DAMAGE TO THE WATER HEATER AND RISK OF FIRE OR EXPLOSION, WHICH CAN ALSO CREATE A
RISK OF ASPHYXIATION. Refer to local codes and /or National Fuel Gas Code for proper air opening sizing.
Unconfined Spaces
In unconfined spaces in buildings, infiltration may be adequate to provide air for combustion, ventilation, and dilution of
flue gases. However, in buildings of tight construction (heavily insulated, weather stripping, caulked, vapor barrier, etc.)
additional air may need to be provided using the methods described below.
Confined Spaces
Confined spaces are spaces defined as having less than 50 ft
3
/1,000 BTU/hr
(4.8 m
3
/kW)
of input.
All Air from Inside the Building:
The confined space must 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. The total input of all gas utilization equipment installed in the combined space must be considered in
making this determination.
Each opening must have a minimum free area of 1 in
2
/1000 BTU/hr
(2200 mm
2
/kW)
of the total input rating of all gas
utilization equipment in the confined space, but not less than 100 in.
2
(0.06 m
2
)
. One opening must be within 12 in.
(31
cm)
of the top and one within 12 in.
(31 cm)
of the bottom of the enclosure.
All Air from Outdoors:
Provide two permanent openings, one commencing within 12 in.
(31 cm)
of the top and one
commencing within 12 in.
(31 cm)
from the bottom of the enclosure. The openings must communicate directly or by ducts
with the outdoors or spaces (crawl or attic) that freely communicate with the outdoors.
1. When communicating with the outdoors through vertical ducts, each opening must have a minimum free area of 1
in
2
/4000 BTU/hr
(550 mm
2
/kW)
of total input rating of all equipment in the enclosure.
2. When communicating with the outdoors through horizontal ducts, each opening must have a minimum free area of 1
in
2
/2000 BTU/hr
(1100 mm
2
/kW)
of total input rating of all equipment in the enclosure.
3. When ducts are used, they must 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 cannot be less than 3 in
(8 cm).
Provide one permanent opening, commencing within 12 in
(31 cm)
of the top of the enclosure. The appliance must have
clearance of at least 1 in
(3 cm)
from the sides and back and 6 in
(16 cm)
from the front of the appliance. The opening
must communicate directly or by ducts with the outdoors or spaces (crawl or attic) that freely communicate with the
outdoors and has a minimum free area of the following:
1. 1 in
2
/3000 BTU/hr
(700 mm
2
/kW)
of the total input rating of all appliances located in the enclosure.
2. Not less than the sum of the areas of all vent connectors in the space.
Specially Engineered Installations
The requirements noted under Confined Spaces above will not necessarily govern when special engineering, approved by
the authority having jurisdiction, provides an adequate supply of air for combustion, ventilation, and dilution of flue gases.
Installation Instructions continued-
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