Contaminants; Determining Total "Free Area; General Venting - Lochinvar Copper-Fin II CX401 Designer's Manual

area of one square inch for each 1000
Btu (22 cm 2 per kW) of input, but not less
than 100 square inches (645 cm
(FIG. 7) COMBUSTION AIR FROM OUTSIDE,
SINGLE OPENING
If a single combustion air opening
4.
is provided to bring combustion
air in directly from the outdoors,
the opening must be sized based on a
minimum free area of one square inch
per 3000 Btu input (7 cm
opening must be located within 12"
(30 cm) of the top of the enclosure.

CONTAMINANTS

Combustion air drawn from an interior
or exterior space must be free of any
chemical fumes which could be corrosive to
the water heater.
Burning chemical fumes results in the
formation of corrosive acids which attack the
water heater, cause improper combustion
and premature failure of the water heater
and vent.
These fumes are often present in areas
where refrigerants, salts, and solvents are
used. Therefore, be aware of swimming
pool equipment, water softening, and
cooling system placement.
L o c h i n v a r
D E S I G N E R
VENTING
General
2 ).
These boilers are classified as Category I
appliances when tested to the latest ANSI
Standard. This classification requires all
conventionally vented combustion products
to be vented using Category I listed vent
pipe.
Additionally, it is recommended that this vent
material be double wall construction or
insulated in the field. A Category I
appliance operates with a non-positive static
vent pressure and with flue loss greater than
17 percent.
Vent installations for connection to gas vents
per kW). This
2
or chimneys must be in accordance with
Part 7, "Venting of Equipment," of the latest
edition of the National Fuel Gas Code, ANSI
Z223.1, or applicable provisions of the local
building codes.
The connection from the appliance vent
to the stack must be as direct as possible
and sized correctly. The horizontal breeching
of a vent must have at least 1/4" rise per
linear foot. The horizontal portions should
also be supported for the design and weight
of the material employed to maintain
clearances, prevent physical damage and
separation of joints.
The connection from the appliance vent
to the stack or vent termination outside the
building must be made with listed
' -
S G U I D E C O P P E R F I N I I B O I L E R
6 1 5 - 8 8 9 - 8 9 0 0
CAUTION!
EXHAUST FANS:
Any fan or
equipment
which exhausts
air from the
equipment room
may deplete the
combustion air
supply and/or
cause a down
draft in the
venting system.
If a fan is used
to supply
combustion air
to the
equipment
room, it MUST
be sized to
make sure that
it does not
cause drafts
which could
lead to nuisance
operational
problems with
the boiler.
7