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WARNING
Do Not block the combustion air openings in
the furnace.
Any blockage will result in
improper combustion and may result in a fire
hazard and/or cause bodily harm.
Chimney installation only
The barometric draft regulator, included with the
furnace, shall be installed in the same room or
enclosure as the furnace in such a manner as to
prevent any difference in pressure between the
regulator and the combustion air supply.
Air requirements for the operation of exhaust fans,
kitchen ventilation systems, clothe dryers, and
fireplaces shall be considered in determining the
adequacy of a space to provide combustion air
requirements.
In unconfined spaces, in buildings of conventional
frame, brick or stone construction infiltration may be
adequate to provide air for combustion, ventilation
and dilution of flue gases. This determination must be
made on an individual installation basis and must take
into
consideration
the
unconfined space, the number of windows and
ventilation openings, the number of doors to the
outside, internal doors which can close off the
unconfined space and the overall tightness of the
building construction.
Many new buildings and homes (and older ones that
have been weatherized must be considered as being
tight construction an, therefore, infiltration will not be
sufficient to supply the necessary air for combustion
and ventilation to supply the necessary air for
combustion and ventilation.
A building can be considered as being of tight
construction when:
a. Walls and ceilings exposed to the outside
atmosphere have a continuous water vapor
retarded with a rating of one perm or less with
openings gaskets or sealed and/or
b. Weather-stripping has been added on operable
windows and doors, and/or
c. Caulking or sealant are applied to areas such as
joints around window and door frames, between
sole plates and floors, between wall-ceiling joints,
between wall panels, at penetrations for plumbing,
electrical and fuel lines and at other openings.
overall
volume
of
the
2.2)
Duct recommendations:
The proper sizing of warm air ducts is necessary to
insure satisfactory furnace operation.
should be in accordance with the latest editions of
NFPA-90A (Installation of Air Conditioning and
Ventilating Systems) and NFPA-90B (Warm Air
Heating and Air Conditioning Systems) or Canadian
equivalent.
The supply ductwork should be attached to the flanged
opening provided at the discharge end of the furnace.
See figures # 5.1 and # 5.2 for the dimensions of this
opening.
Knockouts are provided on both sides of the furnace
to cut the required size opening for the installation of
the return ductwork. This can be done on either the
right or the left side of the furnace. See table # 2 for
location and dimensions.
NOTE: THE BACK SHOULD NOT BE CUT OUT
FOR RETURN AIR
Provision is also made on this furnace for a bottom
return air duct. Knockouts are provided on the floor of
the furnace to facilitate the cut out requirement to
assembly of air filter rack and return ductwork. (We
recommend the use of this opening for horizontal and
counterflow installations).
The following recommendations should be followed
when installing ductwork:
a. Install locking type dampers in all branches of the
individual ducts to balance out the system.
Dampers should be adjusted to impose the proper
static pressure at the outlet of the furnace.
b. A flexible duct connector of noncombustible
material should be installed at the unit on both the
supply and return air systems.
where extremely quiet operation is necessary, the
first 10 feet (if possible) of supply and return ducts
should be internally lined with acoustical material.
c. In cases where the return air grille is located close
to the fan inlet, there should be at least one 90
turn between fan inlet and grille. Further reduction
in sound level can be accomplished by installing
acoustical air turning vanes or lining duct as
described in item 2 above.
d. When a single air grille is used, the duct between
grille and furnace must be the same size as return
opening in furnace.
CAUTION
Return air grilles and warm air registers must
not be obstructed.
Ductwork
In applications
o
air
5
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