John Wood Atmospheric Gas (ENERGY STAR) - NEW - Manuel (Page 10)

10
LP Gas Only
WARNING
Explosion Hazard
Have a qualified technician make sure L.P. gas pressure
does not exceed 13” water column (3.237 kilopascals).
Failure to do so can result in death, explosion, or fire.
Liquefied petroleum gas is over 50% heavier than air
and in the occurrence of a leak in the system, the gas
will settle at floor level. Basements, crawl spaces, closets
and areas below ground level will serve as pockets for
the accumulation of gas. Before lighting an L.P. gas water
heater, smell all around the appliance at floor level. If you
smell gas, follow the instructions as given in the warning
on the front page.
When your L.P. tank runs out of fuel, turn off the gas at
all gas appliances including pilot lights. After the tank is
refi lled, all appliances must be re-lit according to their
manufacturer’s instructions.
Confined spaces are areas with less than 50 cubic feet for
each 1,000 BTUH (4.8 cubic metres per kilowatt) of the total
input for all gas-using appliances.
Unconfined Space
A water heater in an unconfined space uses indoor air for
combustion and requires at least 50 cubic feet for each
1,000 BTUH (4.8 cubic metres per kilowatt) of the total
input for all gas appliances. The table below shows a few
examples of the minimum square footage (area) required
for various BTUH inputs.
TABLE 1
BTU/HR
(kW)
Input
Minimum Square
Feet
(Square Metres)
with 8 Foot
(2.44 Metre) Ceiling
Typical Room
with 8 Foot
(2.44 Metre)
Ceiling
30,000 (8.79) 188 (17.47) 9’ x 21’ (2.7 m x 6.4 m)
45,000 (13.18) 281 (26.10) 14’ x 20’ (4.3 m x 6.1 m)
60,000 (17.58) 375 (34.84) 15’ x 25’ (4.6 m x 7.6 m)
75,000 (21.97) 469 (43.57) 15’ x 31’ (4.6 m x 9.4 m)
90,000 (26.37) 563 (52.30) 20’ x 28’ (6.1 m x 8.5 m)
105,000 (30.76) 657 (61.04) 20’ x 33’ (6.1 m x 10.1 m)
120,000 (35.15) 750 (69.68) 25’ x 30’ (7.6 m x 9.1 m)
135,000 (39.55) 844 (78.41) 28’ x 30’ (8.5 m x 9.1 m)
IMPORTANT:
•
The area must be open and be able to provide the
proper air requirements to the water heater. Areas that
are being used for storage or contain large objects
may not be suitable for water heater installation.
• Water heaters installed in open spaces in buildings
with unusually tight construction may still require
outdoor air to function properly. In this situation,
outside air openings should be sized the same as for a
confined space.
• Modern home construction usually requires supplying
outside air into the water heater area.
COMBUSTION AIR & VENTILATION
WARNING
Carbon Monoxide Warning
Water heater must be vented to outdoors.
Vent must be installed by a qualified technician using
the installation instructions.
Examples of a qualified technican include: gas
technicians, authorized gas company personel, and
authorized service persons.
Failure to so do can result in death or carbon monoxide
poisoning.
IMPORTANT: Air for combustion and ventilation must not
come from a corrosive atmosphere. Any failure due to
corrosive elements in the atmosphere is excluded 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, hobby, or craft
rooms
• water heaters installed near chemical storage areas
Combustion air must be free of acid-forming chemicals such
as sulfur, fluorine, and chlorine. These elements are found
in aerosol sprays, detergents, bleaches, cleaning solvents,
air fresheners, paint, and varnish removers, refrigerants,
and many other commercial and household products. When
burned, vapors from these products form highly corrosive acid
compounds. These products should not be stored or used
near the water heater or air inlet.
Combustion and ventilation air requirements 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.