Installation Guide

4
CombustionAirQuality
CAUTION:
Combustion air must not be drawn from a
corrosiveatmosphere.
To maximize heat exchanger life, the combustion air
must be free of chemicals that can form corrosive acidic
compounds in the combustion gases. The recommended
source of combustion air is to use outdoor air. However,
the use of indoor air in most applications is acceptable
except as listed:
ClearancestoCombustibleMaterials
This furnace is Design Certified in the U.S. and Canada
by CSA International for the minimum clearances to
combustible materials. NOTE: The furnace is listed for
installation on combustible or non-combustible flooring.
However, wood is the only combustible flooring allowed
for installation. Downflow models must use the appropriate
subase kit when installing over a wood floor. To obtain
model number and specific clearance information, refer
to the furnace rating plate, located inside of the furnace
cabinet.
Access for positioning and servicing the unit must be
considered when locating unit. The need to provide
clearance for access to panels or doors may require
clearance distances over and above the requirements.
Allow24inchesminimumclearancefromthefrontof
theunit.However36inchesisstronglyrecommended.
See Figure 1 (page 5) for minimum clearance requirements.
HeatingLoad
The furnace should be sized to provide the design heating
load requirement. Heating load estimates can be made
using approved methods available from Air Conditioning
Contractors of America (Manual J); American Society of
Heating, Refrigerating, and Air Conditioning Engineers;
or other approved engineering methods. Excessive
oversizing of the furnace could cause the furnace
and/orventtofailprematurely.
The information listed below is for reference purposes only
and does not necessarily have jurisdiction over local or state
codes. Always consult with local authorities before installing
any gas appliance.
Combustion&VentilationAir
• US:NationalFuelGasCode(NFGC),AirforCombustion
and Ventilation
• CANADA:NaturalGasandPropaneInstallationCodes
(NSCNGPIC), Venting Systems and Air Supply for
Appliances
DuctSystems
• USandCANADA:AirConditioningContractorsAssociation
(ACCA) Manual D, Sheet Metal and Air Conditioning
Contractors National Association (SMACNA), or American
Society of Heating, Refrigeration, and Air Conditioning
Engineers (ASHRAE) Fundamentals Handbook
ElectricalConnections
• US:NationalElectricalCode(NEC)ANSI/NFPA70
• CANADA:CanadianElectricalCodeCSAC22.1
GasPiping&GasPipePressureTesting
• US:NFGCandNationalPlumbingCodes
• CANADA:NSCNGPIC
GeneralInstallation
• US:CurrenteditionoftheNFGCandtheNFPA90B.For
copies, contact the National Fire Protection Association
Inc., Batterymarch Park, Quincy, MA 02269; or American
Gas Association, 400 N. Capitol, N.W., Washington DC
20001 or www.NFPA.org
• CANADA:NSCNGPIC.Foracopy,contactStandardSales,
CSA International, 178 Rexdale Boulevard, Etobicoke
(Toronto), Ontario, M9W 1R3 Canada
Safety
• US: (NFGC) NFPA 54–1999/ANSI Z223.1 and the
Installation Standards, Warm Air Heating and Air
Conditioning Systems ANSI/NFPA 90B.
• CANADA: CAN/CGA-B149.1 and .2–M00 National
Standard of Canada. (NSCNGPIC)
• Agas-redfurnaceforinstallationinaresidentialgarage
must be installed as specified on page 5.
• Thisfurnaceisnotapprovedforinstallationinmobile
homes. Installing this furnace in a mobile home could
cause fire, property damage, and/or personal injury.
• If the furnace is installed in a conned space, it is
required that the necessary combustion air come from
the outdoors by way of attic, crawl space, air duct, or
direct opening. For Installations in confined spaces, see
pages 7 - 9 for combustion air requirements.
• Installationsintheselocationsmayrequireoutdoorair
for combustion, due to chemical exposures:
Commercial buildings
Buildings with indoor pools
Furnaces installed in laundry rooms
Furnaces installed in hobby or craft rooms
Furnaces installed near chemical storage areas
• Exposuretothefollowingsubstancesinthecombustion
air supply may require outdoor air for combustion:
Permanent wave solutions
Chlorinated waxes and cleaners
Chlorine based swimming pool chemicals
Water softening chemicals
De-icing salts or chemicals
Carbon Tetrachloride
Halogen type refrigerants
Cleaning solvents (perchloroethylene)
Printing inks, paint removers, varnishes, etc.
Hydrochloric Acid
Cements and glues
Antistatic fabric softeners
Masonry acid washing materials