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VDL (E3.1) 10/2020 Page 94/196
DANGER
Risk of suffocation due to high concentration of inert gas.
Death by suffocation.
∅ Do NOT set up chambers in non-ventilated recesses.
Ensure technical ventilation measures.
Respect the relevant regulations for handling these gases.
When decommissioning the vacuum drying oven, shut off the inert gas supply.
Install a pressure reducer for inert gas operation. Set the pressure reducer to a pressure slightly above
ambient pressure. Ensure that the pressure reducer will open. Do not change this setting in order to avoid
perturbation inside the oven and release of big quantities of inert gas after flooding the VDL.
Following evacuation, an inert gas, e.g., nitrogen, is led into the inner chamber via the connection
“GAS/AIR” (4) or the optional connection “GAS/AIR 2” (5) until pressure compensation with the atmosphere
occurs. Depending on the individual application, you can perform a second evacuation and repeat the inert
gas flooding.
When the inert gas fine dosing valve is open, a maximum of approx. 0.6 m³/h gas flows into the inner
chamber. The introduction of inert gas by under-flooding in the lower region of the inner chamber rear wall
and the extraction at the inner chamber ceiling allow an effective inert gas flushing.
9.9.3 Ventilation / breaking the vacuum in case of a power failure
The emergency ventilation is intended for the case of a completed drying process
To be able to open the chamber in case of a power failure, remove the “Manual ventilation” plug (7) for
emergency ventilation, which is located on the chamber rear.
As long as there is a vacuum, never try to open the oven by force.
Make sure that the drying procedure is complete before breaking the vacuum. Otherwise, you
should wait for the power to return to continue the drying procedure.
DANGER
Explosion hazard through the formation of an explosive atmosphere in the pres-
ence of hot surfaces.
Serious injury or death from burns and / or explosion pressure.
∅ Do NOT remove the “Manual ventilation” plug, as long as the drying process is still run-
ning.
9.9.4 Ventilation before completing the drying procedure (flooding with ambient air or
inert gas)
If possible, avoid terminating the drying process. If it is nevertheless to be done, it is essential to observe
the following instructions!
Safety during the drying process: The vacuum during drying prevents the presence of an explosive
atmosphere in the interior of the chamber. At the start of the drying process, the heater is therefore only
released at a pressure of 100 mbar. In addition, the maximum temperature is limited so that, with correct
load, there is no risk of ignition from hot surfaces.
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