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CA
UN Le:
FIRE HAZARD
Failure
to
follow
this
warning
could
result
in
personal
injury, death and/or property damage.
Do not install the furnace on its back or hang furnace with
control
compartment
facing
downward.
Safety
control
operation
will
be
adversely
affected.
Never
connect
return-air ducts to the back of the furnace. See Fig. 4.
Location Relative to Cooling Equipment
The
cooling
coil
must
be
installed
parallel
with,
or
on
the
downstream
side of the unit to avoid condensation in the heat
exchangers. When installed parallel with the furnace, dampers or
other flow
control
must
prevent
chilled
air from
entering
the
furnace.
If the dampers
are manually
operated,
they
must
be
equipped with means to prevent operation of either unit unless the
damper is in the full-heat or full-cool position.
AIR FOR COMBUSTION AND
VENTILATION
Introduction
Direct Vent (2-pipe) Applications
When the furnace is installed as a direct vent (2-pipe) furnace, no
special provisions for air for combustion are required. However,
other gas appliances installed in the space with the furnace may
require outside air for combustion. Follow the guidelines below to
insure that other gas appliances have sufficient air for combustion.
Non-Direct Vent (1-pipe) Applications
When the furnace is installed as a non-direct vent (1-pipe) furnace,
it will be necessary to insure there is adequate air for combustion.
Other gas appliances installed with the furnace may also require air
for combustion
and
ventilation
in addition
to the
amount
of
combustion air and ventilation air required for the furnace. Follow
the guidelines below
to insure that the furnace
and
other gas
appliances have sufficient air for combustion.
Ventilated Combustion Air Applications
When the furnace is installed using the ventilated combustion air
option, the attic or crawlspace must freely communicate with the
outdoor to provide sufficient air for combustion. The combustion
air pipe cannot be terminated
in attics or crawlspaces
that use
ventilation fans designed to operate during the heating season. If
ventilation fans are present in these areas, the combustion air pipe
must terminate outdoors as a Direct Vent/ 2-Pipe system.
All air for combustion is piped directly to the furnace from a space
that is well ventilated with outdoor air (such as an attic, crawl space
or equipment closet) and the space is well isolated from the living
space or garage.
In addition, other gas appliances installed in the
space with the furnace may
require outside air for combustion.
Follow the guidelines below to insure that the roof or crawlspace
wails
have
sufficient
free
area
to
provide
sufficient
air
for
combustion and ventilation for the furnaces. The guidelines below
can be used to insure that other gas appliances have sufficient air
for combustion.
Provisions
for adequate
combustion,
ventilation,
and
dilution
air
must be provided in accordance with:
¢ U.S.A. Installations: Section 9.3 of the NFPA 54/ANSI
2223.1-2009 , Air for Combustion and Ventilation and
applicable provisions of the local building codes.
¢ Canada:
Part 8 of the CAN/CSA-B149.1-2010, Venting
Systems and Air Supply for Appliances.
4
CAUTION
FURNACE
CORROSION HAZARD
Failure to follow this caution may result in furnace damage.
Air for combustion must not be contaminated by halogen
compounds, which include fluoride, chloride, bromide, and
iodide. These elements can corrode heat exchangers and
shorten furnace life. Air contaminants are found in aerosol
sprays,
detergents,
bleaches,
cleaning
solvents,
salts,
air
fresheners, and other household products.
CA
UA Le:
CARBON MONOXIDE POISONING
HAZARD
Failure
to follow
this warning
could
result
in personal
injury or death.
The
operation
of exhaust
fans,
kitchen
ventilation
fans,
clothes dryers, attic exhaust fans or fireplaces could create a
NEGATIVE
PRESSURE
CONDITION
at the
furnace.
Make-up air MUST be provided for the ventilation devices,
in addition to that required by the furnace. Refer to the
Carbon Monoxide Poisoning Hazard warning in the venting
section of these instructions to determine if an adequate
amount of make-up air is available.
The requirements for combustion and ventilation air depend upon
whether or not the furnace is located in a space having a volume of
at least 50 cubic
feet per
1,000
Btuh
input rating for all gas
appliances installed in the space.
¢ Spaces having less than 50 cubic feet per 1,000 Btuh (4.8 cubic
meters per kW) require the Outdoor Combustion Air Method.
¢ Spaces having at least 50 cubic feet per 1,000 Btuh (4.8 cubic
meters per kW) may use the Indoor Combustion Air,
Standard or Known Air Infiltration Method.
Outdoor Combustion Air Method
1. Provide the space with sufficient air for proper combustion,
ventilation, and dilution of flue gases using permanent hori-
zontal or vertical duct(s) or opening(s) directly communicat-
ing with the outdoors or spaces that freely communicate
with the outdoors.
. Fig.
6
illustrates
how
to
provide
TWO
OUTDOOR
OPENINGS,
one inlet and one outlet combustion and vent-
ilation air opening, to the outdoors.
a. One opening MUST commence within 12 in. (300 mm)
of the ceiling and the second opening MUST commence
within 12 in. (300 mm) of the floor.
b. Size openings and ducts per Fig. 6 and Table 3.
c. TWO HORIZONTAL DUCTS require 1 sq. in. (645 sq.
mm) of free area per 2,000 Btuh (1,100 mm2/kW) of com-
bined input for all gas appliances in the space per Fig. 6 and
Table
3.
d. TWO
OPENINGS
OR VERTICAL DUCTS require 1
sq. in. (645 sq. mm) of free area per 4,000 Btuh (550
mm_2/kW) for combined input of all gas appliances in the
space per Fig. 6 and Table
3.
3. ONE OUTDOOR
OPENING requires:
a. 1 sq. in. (645 sq. mm) of free area per 3,000 Btuh (734
mm_2/kW) for combined input of all gas appliances in the
space per Fig. 6 and Table
3.
b. Not less than the sum of the areas of all vent connectors in
the space.
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