Combustion Air; Combustion From Outside The Building; Combustion Air From Inside The Building; Ducted Combustion - Watts Aerco Innovation 800 User Manual

- INTERNATIONAL
Innovation Hot Water Hot Water Boiler User Manual
CHAPTER 2 – INSTALLATION
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.

2.14 COMBUSTION AIR

The AERCO Gas-Fired Heater Venting and Combustion Air Guide, GF-5055 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-5055.

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.

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.

2.15 DUCTED COMBUSTION

The AERCO Innovation Hot Water Boiler 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-5055. When using the heater in a ducted
combustion air configuration, each unit must have a minimum 6 inch (15.24 cm) diameter
connection at the unit.
AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913
Page 32 of 174 OMM-0120_0A
Phone: 800-526-0288
11/15/2016 GF-128-I