Desert Aire Aura QS Installation And Operation Manual page 31

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All separated combustion, power vented units MUST BE equipped with both
combustion air and exhaust piping to the outdoors. The unique concentric adapter
assembly 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.
The systems indicated in this manual are the only venting/combustion air systems
approved for these separated combustion units. Do not use this concentric adapter
box with any other product.
Do not use an existing venting system. This heater REQUIRES installation of the
combustion air/vent system supplied with the unit.
Installation should be done by a qualified agency in accordance with these
instructions. The qualified service agency installing this separated combustion system
is responsible for the installation.
Hazards of Chlorine – The presence of chlorine vapors in the combustion air of
gas-fired heating equipment presents a potential corrosive hazard. Chlorine, found
usually in the form of Freon or degreaser vapors, when exposed to flame, will
precipitate from the compound, and go into solution with any condensation that is
present in the heat exchanger or associated parts. The result is hydrochloric acid
which readily attacks all metal 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 unit vent terminal and combustion air inlet with regard to exhausters
or prevailing wind directions. Remember, chlorine is heavier than air. This fact should
be kept in mind when determining installation location of these heaters and building
exhaust systems.
Measures should be taken to prevent the entry of corrosive chemicals or
vapors to the combustion and ventilation air supply. Such chemicals include
but are not limited to chlorinated and/or fluorinated hydrocarbons such as
found in refrigerants, aerosol propellants, dry cleaning fluids, degreasers, and
removers. Other harmful compounds may come from bleaches, air
fresheners or mastics. Vapors from such products can form acid compounds
when burned in a gas flame. Should acid compounds form in your furnace; it
may reduce the life of the furnace. Please follow these guidelines for
providing outside air directly to the appliance to avoid this problem.
The return air duct of the dehumidifier must be sealed air tight to prevent
starvation of the combustion air, especially if the burner is located in a con
fined area.
Desert Aire - QS/QV Manual
31