AERCO Innovation (G-13-1854 and above) - Manual (Page 34)

Innovation Water Heaters Installation, Operation & Maintenance Manual
CHAPTER 2 – INSTALLATION
Page 34 of
196 AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913
OMM-0078_0J
PRI: 11/22/2013
Phone: 800-526-0288
GF-128
2.14 COMBUSTION AIR
The AERCO Gas-Fired Heater Venting and Combustion Air Guide, GF-5050 MUST be
consulted before any flue or inlet air venting is designed or installed. Air supply is a direct
requirement of ANSI 223.1, NFPA-54, CSA B149.1 and local codes. These codes should be
consulted before a permanent design is determined.
The combustion air must be free of chlorine, halogenated hydrocarbons or other chemicals that
can become hazardous when used in gas-fired equipment. Common sources of these
compounds are swimming pools, degreasing compounds, plastic processing, and refrigerants.
Whenever the environment contains these types of chemicals, combustion air MUST be
supplied from a clean area outdoors for the protection and longevity of the equipment and
warranty validation.
The more common methods of combustion air supply are outlined in the following sections. For
combustion air supply from ducting, consult the AERCO GF-5050, Gas Fired Venting and
Combustion Air Guide.
2.14.1 Combustion From Outside the Building
Air supplied from outside the building must be provided through two permanent openings. For
each unit these two openings must have a free area of not less than one square inch for each
4000 BTUs input of the equipment or 250 square inches of free area. The free area must take
into account restrictions such as louvers and bird screens. For Canada installations, refer to the
requirements specified in CSA B149.1-10, 8.4.1 and 8.4.3.
2.14.2 Combustion Air from Inside the Building
When combustion air is provided from within the building, it must be supplied through two
permanent openings in an interior wall. Each opening must have a free area of not less than
one square inch per 1000 BTUH of total input or 1000 square inches of free area. The free area
must take into account any restrictions, such as louvers.
2.15 DUCTED COMBUSTION
The AERCO Innovation Water Heater is UL listed for 100%-ducted combustion. For ducted
combustion installations, the screen
inlet air ductwork must then be attached directly to the
unit’s air inlet.
In a ducted combustion air application, the combustion air ducting pressure losses must be
taken into account when calculating the total maximum allowable venting run. See the AERCO
Innovation Venting and Combustion Air Guide, GF-5050. When using the heater in a ducted
combustion air configuration, each unit must have a minimum 6 inch diameter connection at the
unit.