AERCO KC1000 Low NOx Boiler July 2011 - Manual (Page 21)

INSTALLATION
2-11
from a clean area outdoors for the protection
and longevity of the equipment.
The more common methods of supplying
combustion air are outlined below. For more
information on combustion air, consult the
AERCO GF-1050, Venting and Combustion Air
Guide.
2.10.1 COMBUSTION AIR 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 250
square inches of free area. 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.
2.10.2 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
1000 square inches of free area. The free area
must take into account any restrictions such as
louvers.
NOTE
KC1000 units equipped with Low NOx
Burners require an optional Cold Air
Damper for operation with Direct Vent/
Sealed Combustion. The Cold Air Damper
is also required when the unit is installed
in an area where the combustion air
supply temperature can drop below 55°F.
Refer to the following paragraph (2.10.3)
and GF-1050 for installation details.
2.10.3 SEALED COMBUSTION
The KC Boiler is UL approved for 100% sealed
combustion application when installed properly.
When a sealed combustion air application is
installed, the sealed combustion air piping must
be deducted from the maximum allowable
discharge piping amounts. Each unit must have
a minimum 6" diameter connection made to the
special Inlet Air Adapter # GP-18917 available
from AERCO. This adapter bolts directly on to
the air inlet of the unit’s blower. See installation
instructions with adapter. All inlet air ducts must
be sealed air tight.
In addition, Cold Air Damper # 99026 must be
installed. It should be located along the inlet duct
run as close as possible to the KC1000 (See
Figure 2.12). The Cold Air Damper must be
placed on individual sections (one Damper per
unit), not in a manifold section. The adjustment
screw on the Damper should be moved to the
center of the slot position and tightened 1/2 turn
past “finger-tight”. DO NOT over-tighten.
See AERCO Venting Guide GF-1050 for further
details.
6" MINIMUM
6x3 REDUCER
COLD AIR DAMPER
(FOR KC1000 LOW NOX)
Figure 2.12
Sealed Combustion Air Connection
2.10.4 TEMPORARY COMBUSTION AIR
FILTERING DURING CONSTRUCTION
When the AERCO KC1000 Boiler is used to
provide heat temporarily during ongoing building
construction, 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 recom-
mends 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 KC1000 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.
During construction check the filter for dust
accumulation and replace it when the
accumulation becomes noticeable.