Innovation Water Heaters Installation, Operation & Maintenance Manual
CHAPTER 2 – INSTALLATION
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34
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AERCO International, Inc.
•
100 Oritani Dr.
•
Blauvelt, NY 10913
OMM-0078_0M
09/11/2015
Phone: 800-526-0288
GF-128
While there is a positive flue pressure during operation, the combined pressure drop of vent and
combustion air systems
must not exceed 140 equivalent feet (42.7m) or 0.81” W.C. (201 Pa)
with 6” (15.24 cm) piping
. Fittings as well as pipe lengths must be calculated as part of the
equivalent length. For a natural draft installation the draft
must not exceed - 0.10” W.C (-24.9
Pa)
. These factors must be planned into the vent installation. If the maximum allowable
equivalent lengths of piping are exceeded, the unit will not operate properly or reliably.
For Massachusetts installations, the following companies provide vent systems which conform
to all applicable requirements for installations within the Commonwealth of Massachusetts.
Contact information is as follows:
Selkirk Corporation - Heatfab Division
130 Industrial Blvd.
Turners Falls, MA 01376
Phone: 1-800-772-0739
www.heat-fab.com
Watertown Supply
33Grove St.
Watertown, MA 02472
Phone: (617) 924-2840
http://www.watertownsupply.com/
M. A. Peacard
1250 Massachusetts Ave.
Boston MA 02125-1689
Phone: (617) 288-0629
www.mapeacard.com
Glover Sheet Metal, Inc.
44 Riverdale Ave.
Newton, MA 02485
Phone: (617) 527-8178
www.gloversheetmetal.com
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 Innovation Venting and Combustion Air
Guide, GF-5050.
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 sq.in. (6.45 sq. cm) for
each 4000 BTUs (1.172 kW) input of the equipment or 250 sq. in. (1613 sq. cm) 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 sq. in. (6.45 sq. cm) per 1000 BTU (0.293 kW) of total input or 1000 sq. in. (6,451 sq. cm)
of free area. The free area must take into account any restrictions, such as louvers.
