AERCO BMK 3.0 LN Dual Fuel June 2010 - Manual (Page 22)

INSTALLATION
2-12
2.13.3 Sealed Combustion
The AERCO Benchmark 3.0 Dual-Fuel 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 3.0 Dual-Fuel
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.