Rheem 95MSP series Installation Instructions Manual Download

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VENTING & COMBUSTION AIR REQUIREMENTS

GENERAL VENTING REQUIREMENTS AND

GUIDELINES

nting

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 dis-
charged 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; Canadian Natural Gas and Propane Installa-
tion Code and The National Fire Code of Canada, or appli-
cable 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) may require outdoor air for combustion (direct-
vent) 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

If combustion air is exposed to the following substances
(but not limited to the following), it should not be used and
the furnace may require outdoor air for combustion
(direct-vent).

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
(NFPA 54). In Canada B149.1; Canadian Natural Gas and
Propane Installation Code and The National Fire Code of
Canada for determining the combustion air requirements for
gas appliances. An unconfined 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 (contempo-
rary construction), outside air may still be required for the
appliances to burn and vent properly. Outside air openings
should be sized the same as for a confined space.

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, IN
CANADA CSA B149.1; CANADIAN NATURAL GAS
AND PROPANE INSTALLATION CODE AND THE NA-
TIONAL FIRE CODE OF CANADA, NFPA 54, AND
LOCAL CODES TO PROVIDE ADEQUATE COMBUS-
TION AND VENTILATION AIR FOR THE FURNACE.
FAILURE TO DO SO CAN RESULT IN EXPLOSION,
FIRE, PROPERTY DAMAGE, CARBON MONOXIDE
POISONING, PERSONAL 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.