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8
Installing the water heater.
Proper operation of the water heater requires air for combustion and ventilation. Provisions for combustion
and ventilation air must comply with referenced codes and standards.
Customer Service Troubleshooting Tips Care and Cleaning Operating Instructions Installation Instructions Safety Instructions
Combustion and Ventilation Air
NOTE: If the water heater is installed
in an unconfined space within
a building of conventional frame,
masonry or metal construction,
infiltration air is normally adequate
for proper combustion and
ventilation. If the water heater is
installed in a confined space,
provisions for combustion and
ventilation air must be made.
A confined space is one having a
volume of less than 50 cubic feet per
1000 BTUH of the aggregate input of
all appliances within that space.
The air must be supplied through two
permanent openings of equal area.
One is to be located within 12″ above
the floor and the other is to be located
within 12″ below the ceiling.
The minimum net free area of each
opening must not be less than one
square inch per 1000 BTUH of the total
input rating of all the appliances in the
enclosure (but not less than 100 square
inches), if each opening communicates
with other unconfined areas inside
the building.
Buildings of unusually tight construction
shall have the combustion and ventilation
air supplied from outdoors, or a freely
ventilated attic or crawl space.
If air is supplied from outdoors, directly
or through vertical ducts, there must be
two openings located as specified above
and each must have a minimum net free
area of not less than one square inch
per 4000 BTUH of the total input rating
of all the appliances in the enclosure.
If horizontal ducts are used to
communicate with the outdoors, each
opening must have a minimum net free
area of not less than one square inch
per 2000 BTUH of the total input rating
of all the appliances in the enclosure.
If ducts are used, the minimum
dimensions of rectangular air ducts
shall not be less than 3″.
NOTE: If the duct openings are
to be covered with a protective
screen or grille, the net free area
of the covering material must be
used in determining the size of the
openings. Protective screening for
the openings MUST NOT be smaller
than 1/4″ mesh to prevent clogging
by lint or other debris.
CAUTION: Large exhaust fans
can lower the air pressure inside
a building or room and interfere
with proper venting and operation.
Commercial kitchens or other
locations that must maintain a high
flow of exhaust air should have the
water heater installed in a separate
room with combustion and
ventilation air supplied directly
from outside as described above.
Corrosive Atmospheres
The air in beauty shops, dry cleaning
establishments, photo processing labs
and storage areas for liquid and
powdered bleaches or swimming pool
chemicals often contains halogenated
hydrocarbons.
An air supply containing halogenated
hydrocarbons may be safe to breathe,
but when it passes through a gas flame,
corrosive elements are released that
will shorten the life of any gas burning
appliance.
Propellants from common spray cans or
gas leaks from refrigeration equipment
are highly corrosive after passing
through a flame.
The water heater warranty is voided when
failure of the heater is due to operation
in a corrosive atmosphere.
NOTE: The water heater
should not be installed
near an air supply
containing halogenated
hydrocarbons.
Inspect Shipment
Inspect the water heater for possible damage. Check the markings on the rating
plate of the water heater to be certain the type of gas supplied corresponds to
the water heater requirements.
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