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VDL (E3.1) 10/2020 Page 88/196
DANGER
Explosion hazard by solvent-containing air penetrating and concentration in the
electrical area of the chamber and at the heater.
Serious injury or death from burns and / or explosion pressure.
Make sure that sweeping the area for electrical equipment, preheating chamber, and
controller housing with compressed air for the defined time (chap. 9.3.2) at maximum
overpressure has been done before turning on the chamber.
Make sure that sweeping the area for electrical equipment, preheating chamber, and
controller housing with compressed air with an overpressure of at least 25 Pa (recom-
mendation: >40 Pa) takes place during the entire operation.
Ensure that the compressed air supply line provided by the operator is equipped with
active monitoring of the defined inlet pressure which clearly indicates a drop and in-
crease in the inlet pressure outside the permissible tolerance of ± 0.2 bar
Proceeding
• The sweeping plug on the chamber rear and the USB cover on the controller housing must be closed
• Adjust the pressure regulator until the clamping ring touches the upper stop. (Only tighten to the stop by
hand)
• Check this display during operation of the chamber. In all operating states, the value on the manometer
must show an overpressure of at least 25 Pa. Recommended value: >40 Pa.
Regarding use of the USB connection during chamber operation please observe the instruc-
tions given in chap. 21.1.
9.3.4 Sweeping after completion of chamber operation (recommended):
• You can stop sweeping 10 minutes after turning off the chamber: Close the pressure regulator to (turn
counterclockwise).
• Then you can close the compressed air supply.
• Check on the manometer that there is no longer any overpressure.
9.4 Condition after establishing the power connection
Only trained personnel with key-authorization may work on the VDL vacuum drying oven.
Prior to establishing the power connection, the following points must certainly be met:
• Installation of the chamber (chap. 6) performed in compliance with the installation guidelines and ambi-
ent conditions (chap. 5)
• Vacuum supply connected (chap. 6.5)
• If required: Inert gas connection established (chap. 6.6)
• Equipotential bonding established (chap. 6.8)
• Upon initial commissioning: Test before initial commissioning performed and passed (chap. 7)
• Technical ventilation is activated
• Sweeping the area for electrical equipment, preheating chamber, and controller housing with com-
pressed air for the defined time (chap. 9.3.2) at maximum overpressure has been done
Establish the power connection: connect the power plug (chap. 6.9). Connect the power supply only when
needed, and disconnect it when the chamber is not in use for an extended period.
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