45
This furnace removes both sensible and latent heat from
the combustion gases. Removal of latent heat results in
the condensation of flue gas water vapor. This condensed
water vapor drains from the secondary heat exchanger
and out of the unit into the drain trap.
When installed as a non-direct vent furnace, only exhaust
piping is required and inside combustion air may be used.
Refer to the section on “NON-DIRECT VENTING.”
Direct vent installations require a dedicated combustion air
and venting system. All air for combustion is taken from
the outside atmosphere and all combustion products are
discharged to the outdoors.
Adequate facilities for providing air for combustion and
ventilation must be provided in accordance with Section
5.3, “Air for Combustion and Ventilation” of the National
Fuel Gas Code, ANSI Z223.1 (latest edition), in Canada
CSA B149.1, or applicable provisions for the local building
codes, and not obstructed so as to prevent the flow of air
to the furnace.
IMPORTANT: Air for combustion and ventilation must not
come from a corrosive atmosphere. Any failure due to cor-
rosive elements in the atmosphere is excluded from the
warranty coverage.
Combustion air must be free of acid-forming chemicals
such as sulfur, fluorine and chlorine. These elements are
found in aerosol sprays, detergents, bleaches, cleaning
solvents, air fresheners, paint and varnish removers, refrig-
erants and many other commercial and household prod-
ucts. When burned in a gas flame, vapors from these
products form acid compounds. The acid compounds in-
crease the dew point temperature of the flue products and
are highly corrosive after they condense.
The following types of installations (but not limited to the
following) will REQUIRE outdoor air for combustion due to
chemical exposures:
Commercial buildings-
Buildings with indoor pools-
Furnaces installed in laundry rooms-
Furnaces in hobby or craft rooms-
Furnaces installed near chemical storage-
areas
Exposure to the following substances in the combustion air
supply (but not limited to the following) will also 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-
Printing inks, paint removers, varnishes etc.-
Cleaning solvents (such as perchloroethylene)-
Hydrochloric acid-
Cements and glues-
Antistatic fabric softeners for clothes dryers-
Masonry curing and acid washing materials-
Combustion air requirements are determined by whether
the furnace is in an open (unconfined) area or in a con-
fined space such as a closet or small room.
When the furnace is installed in the same space with other
gas appliances, such as a water heater, be sure there is an
adequate supply of combustion and ventilation air for the
furnace and the other appliances. Do not delete or reduce
the combustion air supply required by the other gas appli-
ances in this space. See Z223.1, National Fuel Gas Code
(NFPA54) (in Canada CSA B149.1) for determining the
combustion air requirements for gas appliances. An un-
confined space must have at least 50 cubic feet (volume)
for each 1,000 BTUH of the total input of all appliances in
the space. If the open space containing the appliances is
in a building with tight construction (contemporary con-
struction), outside air may still be required for the appli-
ances to burn and vent properly. Outside air openings
should be sized the same as for a confined space.
IMPORTANT: ONLY THE CURRENT VENT INSTRUC-
TIONS APPLY. All 90 Plus Gas Furnaces cannot be com-
mon-vented.
VENTING & COMBUSTION AIR REQUIREMENTS
GENERAL VENTING REQUIREMENTS AND
GUIDELINES
!
WARNING
READ AND FOLLOW ALL INSTRUCTIONS IN THIS
SECTION. FAILURE TO PROPERLY VENT THIS
FURNACE CAN CAUSE CARBON MONOXIDE POI-
SONING, OR AN EXPLOSION OR FIRE, RESULTING
IN PROPERTY DAMAGE, PERSONAL INJURY OR
DEATH.
!
WARNING
ALL FURNACE INSTALLATIONS MUST COMPLY
WITH THE NATIONAL FUEL GAS CODE CSA B149.1
(CANADA), NFPA 54 AND LOCAL CODES TO PRO-
VIDE ADEQUATE COMBUSTION AND VENTILATION
AIR FOR THE FURNACE. FAILURE TO DO SO CAN
RESULT IN EXPLOSION, FIRE, PROPERTY DAM-
AGE, CARBON MONOXIDE POISONING, PER-
SONAL INJURY OR DEATH.
!
WARNING
THIS FURNACE AND ANY OTHER FUEL-BURNING
APPLIANCE MUST BE PROVIDED WITH ENOUGH
FRESH AIR FOR PROPER COMBUSTION AND VEN-
TILATION OF THE FLUE GASES. MOST BUILDINGS
WILL REQUIRE THAT OUTSIDE AIR BE SUPPLIED
INTO THE FURNACE AREA. FAILURE TO DO SO
CAN CAUSE PERSONAL INJURY OR DEATH FROM
CARBON MONOXIDE POISONING. REFER TO SEC-
TION TITLED “NON-DIRECT VENTING” TO DETER-
MINE IF THE FURNACE MUST USE OUTSIDE AIR
FOR COMBUSTION.
Venting
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