AERCO BMK 2.0 LN Nat. Gas June 2010 - Manual (Page 23)

INSTALLATION
2-11
2.13.3 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 Benchmark Venting and Combustion
Air Guide, GF-2050. When using the boiler in a
sealed combustion air configuration, each unit
must have a minimum 8 inch diameter
connection at the unit.
2.13.4 Temporary Combustion Air
Filtering During Construction
When the AERCO Benchmark 2.0LN Boiler is
used to provide heat temporarily during ongoing
building construction, accumulated drywall dust,
sawdust and similar particles can accumulate in
the unit’s combustion air intake filter and block
combustion air flow. In these situations, AERCO
recommends that a disposable air intake filter be
installed, temporarily, above the boiler
combustion air inlet.
AERCO recommends that the temporary air filter
be cut from a McMaster-Carr part no. 2122K315
Polyester Air Filter Roll Tackfield, ½” thick, 16”
wide, or equivalent. Cover the Benchmark 3.0
air inlet with the blue side of the filter material
facing outward to hold the dust on the outside
surface. Maximize the surface area of the filter
covering the 8" diameter opening by creating a
dome out of the filter material.
Cover the flared duct opening with the blue side
facing outward. During construction check the
filter for dust accumulation and replace it when
the accumulation becomes noticeable.