AERCO BMK 1500-2000 - Manual (Page 31)

Benchmark 1500 - 2000 Boilers
CHAPTER 2 – INSTALLATION
OMM-0097_0D AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 Page 31 of 188
GF-142
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2.12 COMBUSTION AIR
The AERCO Benchmark Boiler Venting and Combustion Air Guide, GF-2050 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-2050, Gas Fired Venting and
Combustion Air Guide.
2.12.1 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 375 square inches of free area for the BMK 1500 or 500
square inches of free area for the BMK 2000. 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, sections 8.4.1 and 8.4.3.
2.12.2 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 3000 square inches of free area. The free area
must take into account any restrictions, such as louvers.
2.13 DUCTED COMBUSTION AIR
For ducted combustion air installations, the air ductwork must then be attached directly to the air
inlet connection on the sheet metal enclosure.
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
Benchmark Venting and Combustion Air Guide, GF-2050. When using the unit in a ducted
combustion air configuration, each unit must have a minimum 8 inch diameter connection at the
unit.
2.14 SEQUENCING VALVE INSTALLATION
All Benchmark units are shipped with a connection for an optional motorized external
sequencing valve (p/n 92084-TAB) included in the shipping container. This valve is an integral
component of the AERCO’s on-board Boiler Sequencing Technology (BST) solution. BST
allows sites with multiple boilers to have one boiler, acting as a “master” to manage the other
boilers at the site in such a way that the efficiency of the entire boiler array is maximized.
The implementation of BST, and the installation and use of this valve is optional.
The boiler IS pre-wired to accept the sequencing valve. Installation consists of installing the
sequencing valve in the hot water outlet pipe, and then connecting it into the shell harness, as
described below.