Despatch LCC1-51-3 - Manual (Page 28)

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is used at temperatures above 180°C / 356°F. There will be smoke, possibly a pungent
odor, and a light residue on interior surfaces. This is the result of oxidation of the
binder. Most of the binder will leave the filter after running at a temperature of
260°C/500°F for 48 (forty-eight) hours. Check the oven for particles or the exhaust for
smoke and odor to determine that the process is finished.
Select a location for this process where the smoke and odor generated will be ventilated
with the least amount of interruption and inconvenience. Ideally this will be in the final
location for the oven. However, it may be a receiving dock, some well ventilated space
or even outside if the weather is acceptable. If this location is a very clean area, then
special attention must be given to an exhaust hook-up that will capture the smoke and
odor. The post-cleaning (i.e. oven wipe down) may also generate dust, and care should
be taken if this is done in a clean room.
The following procedure is recommended:
1.
Locate the equipment exhaust opening where chamber air is being expelled.
If the oven filter is burned off in a clean area, be sure to handle the equipment
exhaust appropriately. If the equipment is large and the exhaust stack is a
permanent service connection, it should be connected before the burn-off
process is run. If the equipment is small with no permanent exhaust duct
required, arrange a temporary connection out of the clean area that will handle
the maximum temperature of the equipment. Direct the smoke and odor outside,
or to a highly ventilated area.
2.
Set the temperature control at the maximum process temperature.
•
Silicone: Ramp at 1.25° C/min to 260° C and soak for 48 hours.
•
Media Pack: Ramp at 1.25° C/min to 260° C and soa k for 48 hours.
•
Termikfil: Ramp at 5° C/min to 350° C and soak for 48 hours.
3.
Start the fan after making the electrical power connections.
4.
Energize the equipment heater.
Use enough fresh air to remove the smoke, while still being able to achieve and
maintain the necessary temperature. The completion of the burn-off period
should be based on the particle level in the oven or smoke-free exhaust and
minimal odor level.
The filter hold-down nuts should be checked after burn-off and tightened again if
necessary. For best oven particle control, this step should be repeated on a
regular basis.