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Installing the water heater.
NOTICE: The water heater
should not be installed
near an air supply
containing halogenated
hydrocarbons.
8
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.
Combustion and Ventilation Air
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.
When installed in a closet, DO NOT
block or obstruct any of the combustion
air inlet openings located around the
perimeter of the water heater. A
minimum of 1" is required between
these combustion air inlet openings and
any obstruction.
NOTICE:
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" from 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
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
contain such 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.
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".
NOTICE:
If the duct openings which
supply combustion and ventilation air
are to be covered with a protective
screen or grill, the net free area
(openings in the material) of the
covering material must be used in
determining the size of the openings.
Protective screening for the openings
MUST NOT be smaller then 1/4" mesh to
prevent clogging by lint or other debris.
Propellants from common spray cans
or gas leaks from A/C and 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.
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