Operating Guide

14
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English
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.
Combustion and Ventilation Air
A conned space is one having a volume of less than 50 cubic feet per
1,000 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 oor 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 1,000 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 unconned 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 specied above and each must
have a minimum net free area of not less than one square inch per 4,000
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 2,000 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 4”.
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. Verify all
included parts are present (see below).
NOTICE: If the water heater is installed in an unconned space within a building of conventional
frame, masonry or metal construction, inltration air is normally adequate for proper combustion and
ventilation air must be made.
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 openings. Protective screening for the openings MUST NOT be smaller
than ¼” to prevent clogging by lint or other debris.
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 ame corrosive elements are released that will
shorten the life of any gas burning appliance.
Propellants from common spray cans or gas leaks
from A/ C and refrigeration equipment are highly
corrosive after passing through a ame.
The water heater warranty is voided when failure
of the heater is due to operation in a corrosive
atmosphere.
NOTICE: The water heater should not be installed near
any air supply containing halogenated hydrocarbons.
Typical Installation
Not Included
These items are not included but
are recommended and available
for purchase
at www.eccotemp.com
Installation