Lennox B050A3B, Installation/Servicing Instructions And Users Information Manual

Page: 8 / 36

Page 8 of 36 506307-01 Issue 1207
AIR FOR COMBUSTION AND VENTILATION
Contaminated Combustion Air and Fuels :
Allowing exposure to substances containing chlorine or
fluoride could harm the furnace and void warranty.
Substances to avoid include, but are not limited to:
•
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 (such as perchloroethylene)
•
Printing inks, paint removers, varnishes, etc.
•
Hydrochloric acid
•
Cements and glues
•
Antistatic fabiric softeners for clothes dryers
•
Masonry acid washing materials
•
Unrefined Gases
Contaminated combustion air may cause premature failure
of the heat exchanger that may lead to a hazardous
condition and/or bodily harm, or loss of life.
WARNING
Adequate Ventilation and Combustion Air :
This section is provided to give guidelines for the
introduction of air for ventilation and combustion air. The
total quantity of air provided to the installation area must
equal the requirements of all gas appliances in the area.
Adequate facilities for providing air for combustion and
ventilation must be provided in accordance with the latest
edition of the National Fuel Gas Code ANSI Z223.1/NFPA54
or CSA B149.1 Natural Gas and Propane Installation Codes,
or applicable provisions of the local building codes.
The furnace shall be installed in a location in which the
facilities for ventilation permits satisfactory combustion of
gas, proper venting and maintenance of ambient
temperature at safe limits under normal conditions of use.
The furnace shall be located so as not to interfere with proper
circulation of air.
In addition to air needed for combustion, ventilation in
the form of process air must be provided as required for:
cooling of eqipment or material, controlling dew point,
heating, drying, oxidation or dilution, safety exhaust and odor
control. Air must be supplied for ventilation, including all air
required for comfort and proper working conditions for
personnel.
For purposes of this instruction the following definitions
apply:
Confined Space: A space whose volume is less than
50 cubic feet per 1000 Btu/hr of the
aggregate input rating of all
appliances installed in that space.
Unconfined Space: A space whose volume is not less
than 50 cubic feet per 1000 Btu/hr
of the aggregate input rating of all
appliances installed in that space.
Rooms communicating directly
with the space in which the
applicances are installed, through
openings not furnished with doors,
are considered a part of the
unconfined space.
If the installation area meets the definition of “Unconfined
Space” and does not have additional air requirements as
described, the furnace may be installed without making
special provisions for combustion and ventilation air.
Whenever this furnace is installed in an area along with
one or more gas appliances, the total Btu/hr input of all
appliances must be included when determining the free
area requirements for combustion and ventilation air
openings.
CAUTION
If ventilation and/or combustion air must be supplied to
the “Confined Space” from outside the building structure,
two permanent openings to the outdoors must be created.
Each opening must have a free area of not less than one
square inch per 4000 Btu per hour of total input of all
applicances within the “Confined Space”, (See Figures 2
and 3). Neither openings can be blocked at any time.
Do not block the combustion or ventilation air openings in
the furnace. Any blockage will result in improper
combustion and may result in a fire hazard or unsafe
condition.
WARNING