Technical data

0803UDSA-2GBEN, Pag. 12/36
The presence of chlorine vapours in the combustion air of gas-fired heating equip-
ment presents a potential corrosion hazard. Chlorine, found usually in the form of
freon or degreaser compounds when exposed to a 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 at-
tacks all metals. Care should be taken to separate these vapours from the combus-
tion process. This may be done by wise location of the unit flue and combustion
air terminals 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 stain-
less 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 final 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 significant air stratification. When
possible, heaters should be arranged to blow toward or along exposed wall sur-
faces.
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 airflow will be
deflected 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
discharge 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 conjunc-
tion with recirculating air fans suspended at high level.
At those points where infiltration 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 downflow unit over the door opening.