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SC-TSL (07-23) REV-0
Separated Combustion
• This separated-combustion unit is designed and manufactured in accordance with the ANSI definition of separated
combustion, which reads, “Separated Combustion System Appliance: A system consisting of an appliance and
a vent cap(s) supplied by the manufacturer, and (1) combustion air connections between the appliance and the
outside atmosphere, and (2) flue gas connections between the appliance and vent cap, of a type(s) specified by the
manufacturer but supplied by the installer, constructed so that, when installed in accordance with the manufacturer’s
instructions, air for combustion is obtained from the outside atmosphere and flue gases are discharged to the
outside atmosphere.”
• Separated-combustion units are designed to separate air for combustion and flue products from the environment
of the building in which the unit is installed. Separated-combustion appliances are recommended for use in dust-
laden and some corrosive-fume environments.
Hazards of Chlorine
⚠ WARNING ⚠
SC series separated-combustion units are not designed or approved for use in atmospheres
containing flammable vapors or atmospheres highly-laden with chlorinated vapors.
NOTE: Remember, chlorine is heavier than air. This fact should be kept in mind when determining
the installation location of heaters and building exhaust systems.
The presence of chlorine vapors in the combustion air of heating equipment presents a potential corrosion hazard.
Chlorine, found usually in the form of Freon or degreaser vapors, when exposed to flame will precipitate from the
compound and form a solution with any condensation present in the heat exchanger or associated parts. The result
is hydrochloric acid, which readily attacks all metals, including 300 grade stainless steel. Care should be taken to
separate these vapors from the combustion process. This may be done by wise location of the unit with regard to
exhausters or prevailing wind directions.
Venting/Combustion Air Requirements
⚠ WARNING ⚠
Do not use an existing venting system. This heater requires installation of the combustion air/vent
system ordered with the unit (either option CC2 or CC6). Vent installation to be any listed vent
system manufacturer. Do not intermix different vent system parts from different manufacturers
in the same venting system.
• All separated-combustion, power-vented units MUST BE equipped with both combustion air and exhaust piping
to the outdoors. The unique concentric adapter box designed for use with this heater allows for both combustion
air and exhaust piping with only one horizontal or vertical penetration hole in the building.
• Installation should be done by a qualified agency in accordance with the instructions. The service agency installing
this separated-combustion system is responsible for the installation. Refer to the installation manual for further
information on ventin/combustion air requirements.
Ductwork Requirements
⚠ CAUTION ⚠
Joints where ducts attach to furnace must be sealed securely to prevent air leakage into burner
rack area. Leakage can cause poor combustion, poor performance, and pilot problems and can
shorten heat exchanger life.
NOTE: Make adjustments to ductwork as necessary to obtain a temperature rise and static pressure
within the ranges specified on the heater rating plate.
Refer to the installation manual for further information on ductwork requirements.
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