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VDL (E3.1) 10/2020 Page 16/196
1.7.1.4 Accessibility to the disconnection from the power grid
To completely separate the chamber from the power supply, you must disconnect the power plug. Install
the chamber in a way that the power plug is easily accessible and can be easily pulled in case of danger.
The chamber’s power plug is unprotected. The electrical connection must therefore be established outside
a zone.
1.7.1.5 Technical ventilation (extraction)
The operator shall provide active extraction (technical ventilation according to country-specific regulations
(TRBS 2152 Part 2 for Germany) before commissioning the chamber. Extraction must include the entire
installation area of the vacuum drying oven and a vacuum pump. Observe the area classification in the
surroundings of the chamber (chap. 3.5.3). Extraction must be active during the entire chamber operation.
Operation, loading and unloading of the loading material and removal of the filled condensate catchpot of
the pump must always take place under technical ventilation. If the technical ventilation fails, automatically
switch off power to the chamber.
This will prevent spreading of an explosive atmosphere to unprotected areas (see chap. 3.5).
DANGER
Explosion hazard due to the spread of an explosive atmosphere to unprotected ar-
eas and ignition due to electric sparking or hot surfaces.
Serious injury or death from burns and / or explosion pressure.
Provide active suction (technical ventilation according to country-specific regulations
(TRBS 2152 Part 2 for Germany) prior to commissioning the chamber.
Extraction must include the entire installation area of the vacuum drying oven.
Make sure that the chamber is automatically turned off if the technical ventilation fails.
1.7.2 Safety instructions on compressed air supply
Before starting / restarting the chamber, the electrical installation room, preheating chamber, and controller
housing (triangular instrument box) must be swept with compressed air with maximum overpressure for a
defined time (chap. 9.3).
Sweeping the area for electrical equipment, the preheating chamber and controller housing must take place
with an overpressure of at least 25 Pa (recommendation: >40 Pa) during the entire operation of the vacuum
drying oven. Also after termination or cancellation of the drying process, continued sweeping for at least 10
minutes is recommended.
An inlet pressure of 2 bar must be provided for compressed air sweeping. The compressed air supply line
provided by the operator must be equipped with a monitoring device which clearly indicates a drop and
increase in the inlet pressure outside the permissible tolerance of ± 0.2 bar.
DANGER
Explosion hazard by solvent-containing air penetrating the electrical area of the
oven or the preheating chamber.
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 operator compressed air supply line is equipped with active monitoring
of the defined inlet pressure.
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