Benchmark 2.0 LN Installation, Operation & Maintenance Manual
CHAPTER 2 – INSTALLATION
Page
30
of
168
AERCO International, Inc.
•
100 Oritani Dr.
•
Blauvelt, NY 10913
OMM-0046_0J
06/18/2015
Phone: 800-526-0288
GF-123
For a natural draft installation the draft must not exceed ±0.25 inch W.C. 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 Heatfab Division of the Selkirk Corporation provides vent
systems which conform to all applicable requirements for installations within the Commonwealth of
Massachusetts. Contact information for this supplier is as follows:
Selkirk Corporation, Heatfab Division (
www.heat-fab.com
),
130 Industrial Blvd., Turners Falls, MA 01376
Phone: 1-800-772-0739
2.12 COMBUSTION AIR
The AERCO Benchmark Venting and Combustion Air Guide, GF-2050
MUST be consulted
before
any flue or combustion supply air venting is designed or implemented. Combustion 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.
The AERCO Benchmark 2.0LN Boiler is UL listed for 100% sealed combustion. It can also be
installed using room air, provided there is an adequate supply. (See para. 2.13.3 for more
information concerning sealed combustion air). If the sealed combustion air option is not being
used, an inlet screen will be attached at the air inlet on the top of the unit
The more common methods of supplying combustion air are outlined below. For more information
concerning combustion air, refer to the AERCO Benchmark Venting and Combustion Air Guide,
GF-2050.
2.12.1 Combustion Air From Outside the Building
Air supplied from outside the building must be provided through two permanent openings. Each
opening must have a free area of not less than one square inch for each 4000 BTU/H boiler input.
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.
2.12.2 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 BTU/H of total boiler input. The free area must take into account any
restrictions such as louvers.
2.12.3 Sealed Combustion
The AERCO Benchmark 2.0LN Boiler is UL listed for 100%-sealed combustion. For sealed
combustion installations, the screen on the air inlet duct of the unit must be removed. The inlet air
ductwork must then be attached directly to the unit’s air inlet.
In a sealed 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
