9
Installation (continued)-
VENTING
Place the draft diverter over the flue opening at the top of the water heater by
inserting the tips of the draft diverter legs into the four (4) holes provided in
the water heater top. On some models, line up the holes in the draft diverter
legs with the holes provided on top of the water heater. Secure the draft
diverter to the water heater with sheet metal screw. (See Figure 5)
Vent piping must be attached to the draft diverter outlet to connect the water
heater to the gas vent or chimney. The following minimum clearances must
be followed when connecting vent piping:
a) The vent connector must be the same nominal size as the draft
diverter.
b) The vent connector should not exceed 15 feet
(4.5m)
in length (for
power vent appliances, refer to supplemental instructions), must not
project into the chimney beyond the inner wall and should contain the
least possible number of bends.
c) All horizontal runs should have a minimum rise of ¼ inch per foot
(2.1cm/m)
.
d) Joints of vent connectors shall be securely fastened by sheet metal
screws or other approved methods.
e) All single wall vent connectors must be at least 6”
(15cm)
from
combustible
surfaces.
f) Vent connectors made of single-wall metal pipe shall not pass
through any attic, inside wall, concealed space, or any floor. When a
single-wall metal pipe passes through an exterior wall constructed of
combustible material, it shall be guarded at the point of passage by a
ventilated metal thimble at least 4”
(10cm)
larger in diameter than
the connector. (Consult National Fuel Gas Code, ANSI Z223.1and/or
CAN/CGA B149, Installation Codes).
A separate vent for each application is strongly recommended. If combined
venting of multiple appliances is necessary or if an unusual situation arises,
consult the National Fuel Gas Code, ANSI Z223.1and/or CAN/CGA B149,
Installation Codes, for sizing and installation information.
WARNING
The vent system must be installed properly. Failure to properly install the
vent system could result in property damage, personal injury, or death.
10
Combustion Air Supply
Provide adequate air for combustion and ventilation. An insufficient supply of
air will cause recirculation of combustion products resulting in air
contamination that may be hazardous to life. Such a condition often will
result in a yellow, luminous burner flame, causing carboning or sooting of the
combustion chamber, burners and flue tubes with possible damage to the
water heater.
When an exhaust fan is installed in the same room with a heater, sufficient
openings for air must be provided in the walls. Undersized openings will
cause air to be drawn into the room through the chimney, causing
recirculation of combustion products.
Confined Spaces
Confined spaces are spaces defined as having less than 50 ft.
3
/1000 BTU
(15m
3
/.29kw)
per hour.
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 (for example, weather stripping, heavily insulated,
caulked, vapor barrier, etc.), additional air may need to be provided using the
methods described above under CONFINED SPACES: All Air From
Outdoors or SPECIALLY ENGINEERED INSTALLATIONS.
Installation (Combustion Air Supply) continued-
WARNING
Liquefied petroleum gases/propane gas are heavier than air and will
remain at floor level if there is a leak. Basements, crawl spaces, closets
and areas below ground level will serve as pockets for accumulation of
leaking gas. Before lighting, smell all around the appliance area for gas.
Be sure to smell next to the floor.
IF YOU SMELL GAS:
•
Do not try to light any appliance.
•
Do not touch any electric switch; do not use any telephone in your
building.
•
Immediately call your gas supplier from a neighbor’s telephone.
Follow the gas supplier’s instructions.
•
If you cannot reach your gas supplier, call the fire department.
DO NOT OPERATE APPLIANCE UNTIL LEAKAGE IS CORRECTED!
IMPORTANT
The flow of combustion and ventilating air must not be obstructed.
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