4
GENERAL INSTRUCTIONS
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:
• If the furnace is installed in a confi 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 confi ned spaces, see
pages 6 - 7 for combustion air requirements.
• Installation 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
Clearances to Combustible Materials
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.
Specifi c clearance information can be found on the furnace
rating plate.
SAFETY INFORMATION
Safety markings are used frequently throughout this
manual to designate a degree or level of seriousness and
should not be ignored.
WARNING
indicates a potentially
hazardous situation that if not avoided, could result in
personal injury or death.
CAUTION
indicates a potentially
hazardous situation that if not avoided, may result in minor
or moderate injury or property damage.
WARNING:
The safety information listed below must be
followed during the installation, service, and
operation of this furnace. Failure to follow safety
recommendations could result in possible
damage to the equipment, serious per
sonal
injury or death.
• Use only with type of gas approved for this furnace.
Refer to the furnace rating plate.
• Install this furnace only in a location and position as
specifi ed in Table 1 (page 5).
• Provide adequate combustion and ventilation air to the
furnace space as specifi ed on pages 6 - 8.
• Combustion products must be discharged outdoors.
Connect this furnace to an approved vent system only,
as specifi ed on page 8.
• Never test for gas leaks with an open fl ame. Use a
commercially available soap solution to check all
connections (page 11).
• This furnace is designed to operate with a maximum
external pressure rise of 0.5 inches of water column.
Consult Table 5 (pages 22 - 23), and the rating plate
for the proper circulating air fl ow and temperature rise.
NOTE:
It is important that the duct system be designed
to handle the desired fl ow rate and temperature rise. An
improperly designed duct system can result in nuisance
shutdowns, and comfort or noise issues.
• When supply ducts carry air circulated by the furnace
to areas outside the space containing the furnace, the
return air shall also be handled by duct(s) sealed to
the furnace casing and terminating outside the space
containing the furnace. See page 9.
• A gas-fi red furnace for installation in a residential garage
must be installed as specifi ed on page 6.
REQUIREMENTS AND CODES
This furnace must be installed in accordance with
these instructions, all applicable local building codes
or the current revision of the International Fuel Gas
Code.
Any additional codes shown are for reference purposes
only and do not necessarily have jurisdiction over local or
state codes. Always consult with local authorities before
installing any gas appliance.
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