AERCO BMK 3.0 LN Nat. Gas Jan 2011 - Manual (Page 24)

INSTALLATION
2-12
2.13.2 Combustion Air From Inside the
Building
When combustion air is provided from within the
building, it m ust be s upplied thr ough t wo
permanent op enings i n a n int erior 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.
2.13.3 Sealed Combustion
The AER CO Benchmark 3.0 Boiler is U L listed
for 100%- sealed c ombustion. F or s ealed
combustion ins tallations, t he s creen on the a ir
inlet duct of the unit must be removed. The inlet
air duc twork must then be attac hed dir ectly t o
the unit’s air inlet.
In a s ealed c ombustion air app lication, the
combustion air ducting pressure losses must be
taken into ac count when c alculating th e tota l
maximum allo wable v enting r un. See t he
AERCO Be nchmark Venti ng an d Com bustion
Air Guide, GF-2050. When using the boiler in a
sealed c ombustion a ir c onfiguration, each unit
must have a m inimum 8- inch diam eter
connection at the unit.
2.13.4 Temporary Combustion Air
Filtering During Construction
When the AERCO Benchmark 3.0 Boiler is used
to pr ovide he at tem porarily dur ing ongoing
building construction, accumulated drywall dust,
sawdust and similar particles can accumulate in
the un it’s c ombustion a ir i ntake f ilter and b lock
combustion air flow. In these situations, AERCO
recommends that a disposable air intake filter be
installed, temporarily, abo ve the bo iler
combustion air inlet.
AERCO recommends that the temporary air filter
be cut from a McMaster-Carr part no. 2122K315
Polyester Air Filter Roll Tackfield, 1/2” thick, 16”
wide, or e quivalent. C over the Benchmark 3.0
air in let with the b lue s ide of the f ilter m aterial
facing out ward to hold th e dus t on t he o utside
surface. Max imize th e s urface ar ea of the f ilter
covering the 8 " di ameter opening b y c reating a
dome out of the filter material.
During c onstruction, c heck the f ilter f or dus t
accumulation a nd r eplace it when t he
accumulation becomes noticeable.