1103UDSA-2--EN, Pag. 12/36
The presence of chlorine vapours in the combustion air of gas-fi red heating equip-
ment presents a potential corrosion hazard. Chlorine, found usually in the form of
freon or degreaser compounds when exposed to a fl ame 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 metals. Care should be taken to separate these vapours from the combustion
process. This may be done by wise location of the unit fl ue and combustion air ter-
minals with regard to exhausters or prevailing wind directions. Chlorine is heavier
than air. Keep this fact in mind when determining installation location of the heater
in relation to building exhaust systems.
Where chlorine vapours are prevalent heaters with special grade 316 A1SI stainless
steel heat exchangers are recommended.
Hazards of
Chlorine - apply
to the location of
the combustion air
inlet
8. Location
heater
Remark:
Flue requirements
may affect location.
Consult section 7
before making a fi nal
determination.
WARNING: If touched, the vent pipe and internal heater surfaces
that are accessible from outside the heater will cause burns. Suspend
the heater such that these components cannot be touched.
Use the minimum clearances in section 5 and the throw data in the technical data
table of section 6 when determining where to suspend the heater.
Recommended minimum height is 2.5mm.
CAUTION : Do not locate the heater where it may be exposed to water.
For best results, the heater should be placed with certain rules in mind. Always
ensure that minimum clearances are maintained. Locating a unit heater above the
maximum recommended height can result in signifi cant air stratifi cation. When
possible, heaters should be arranged to blow toward or along exposed wall surfaces.
Suspended heaters are most effective when located as close to the working zone as
possible, but care should be exercised to avoid directing the discharged air directly
on to room occupants.
Partitions, columns, counters, or other obstructions should be taken into consider-
ation when locating the unit heater so that a minimum quantity of airfl ow will be
defl ected by such obstacles.
When units are located in the centre of the space to be heated, the air should be
discharged toward the exposed walls. In large areas, units should be located to dis-
charge air along exposed walls with extra units provided to discharge air in toward
the centre of the area. For optimum results heaters are best used in conjunction with
recirculating air fans suspended at high level.
At those points where infi ltration of cold air is excessive, such as at entrance doors
and shipping doors, it is desirable to locate the unit so that it will discharge directly
toward the source of cold air, typically from a distance of 4.5 to 6.0 meters or install
a downfl ow unit over the door opening.
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