Bradford White EF120T Installation & Operation Manual With Troubleshooting Manual page 12

Location
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 often will result in a yellow, luminous burner flame, causing carboning or sooting of the combustion
chamber, burner, and flue tubes.
Mechanical Exhausting of Room Air
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 Space
1. In buildings of conventional frame, brick, or stone construction, unconfined spaces may provide adequate air
for combustion and ventilation.
2. If the unconfined space is within a building of tight construction (buildings using the following construction:
weather stripping, heavy insulation, caulking, vapor barrier, etc.), air for combustion and ventilation must be
obtained from outdoors. This may be accomplished by piping air directly to the water heater from outside or
providing opening or ducts in the wall. The installation instructions for confined spaces in tightly constructed
buildings must be followed to ensure adequate air supply.
Confined Space (Spaces having less than 50 ft
1. When drawing combustion air from inside a conventionally constructed building to a confined space, such
a space shall be provided with two permanent openings.
•
The top opening is to be located within 12 in (30 cm) of the enclosure top and the bottom opening
within 12 in (30 cm) of the enclosure bottom.
•
Each opening shall have a free area of at least 1 square inch per 1000 BTU per hour (2200
2
mm /kW) of the total input of all appliances in the enclosure, but not less than 100 in
2. If the confined space is within a building of tight construction, air for combustion and ventilation must be
obtained from outdoors. This may be accomplished by piping air directly to the water heater from outside
or providing opening or ducts in the wall. When directly communicating with the outdoors through vertical
ducts, two permanent openings, located in the above manner, shall be provided.
•
Each opening shall have a free area of not less than 1 square inch per 4000 BTU per hour (550
2
mm /kW) of the total input of all appliances in the enclosure.
•
If horizontal ducts are used, each opening shall have a free area of not less than 1 square inch per
2000 BTU hour (1100 mm
3. If the water heater is installed as a direct vent (outside air piped directly to the water heater), then
additional openings, other than the opening for the air intake, are not required. However, adequate
ventilation air must be provided in all cases to prevent increased room temperature.
Chemical Vapor Corrosion
Corrosion of the flue ways and vent system will occur if air for combustion contains certain chemical vapors. Such
corrosion may result in poor combustion and create a risk of asphyxiation, as well as reducing the life of the water
heater. Spray can propellants, cleaning solvents, refrigerator and air conditioning refrigerants, swimming pool
chemicals, calcium and sodium chloride, waxes and process chemicals are corrosive. Products of this sort should
NOT be stored near the water heater or outside by the air intake (if applicable).
WARNING
CAUTION
3
/1000 BTU/hr (4.8 m
2
/kW) of the total input of all appliances in the enclosure.
12
3
/kW))
2
.