BINDER VD 23 - Manual (Page 38)

VDL (E2.1) 04/2014 page 38/107
Connect the inert gas supply to the inert gas connection (adapter with hose olive diameter 8 mm / 0.31 in)
via a pressure reducer. Screw the enclosed adapter with hose olive on the thread (11) at the unit rear. Set
the pressure reducer to a pressure slightly above ambient pressure. Make sure that the pressure reducer
will open. Do not alter this setting in order to avoid perturbation inside the oven and the release of large
quantities of inert gas after flooding the VDL.
CAUTION
Overpressure in the inner chamber.
Turbulence of the charging material.
∅
Do NOT modify the atmospheric pressure setting.
4.4 Compressed air / inert gas connection for sweeping the area for electrical
equipment
The compressed air flows through the area for electrical equipment as well the preheating chamber, which
prevents a possible concentration of a solvent-containing atmosphere in the area for electrical equipment.
You can alternatively connect inert gas or nitrogen to the compressed air connection. Use only dry gas.
In order to avoid that any oil coming from the compressed-air piping enters the vacuum drying oven, the
compressor of the compressed air system must be equipped with an oil separator, or the compressed air
system must be constructed oil-free. The condensate separator of the compressed air connection sepa-
rates water and soil from the compressed-air piping, thus leading to compressed air quality class 4 acc. to
ISO 8573-1. However, it does not prevent oil penetrating from the compressed air system, e.g. the com-
pressed air compressor, into the compressed-air piping. The condensate separator is equipped with a
manual condensate outlet (chap. 16.1).
Connection: Before commissioning, the existing compressed
air unit must be connected on the right side of the unit (hose
olive ∅ 8 mm) to a compressed air line (compressed air system)
or to an inert gas supply. There must be an overpressure of at
least 1.5 bar / 44.3 inHg in the supply network. The maximally
permitted pressure is 7 bar / 206.7 inHg.
Immediately after connecting the compressed air or inert gas
supply, the area for electrical equipment of the oven will be
swept at 5 liters per minute. This air or inert gas quantity is used
and then released into the surrounding atmosphere permanent-
ly; independent of the oven’s operating state. Therefore the
compressed air or inert gas connection on the building side
should be equipped with a stop valve that can be used to cut off
the gas supply, after having operated the drying oven. Figure 13: Compressed air connec-
tion with condensate separator
If solvent-containing air penetrates the electrical area of the unit, explosions may result.
DANGER
Solvent-containing air penetrating the electrical area of the unit.
Explosion hazard.
∅
Do NOT take the air for the compressed air supply from explosive atmospheres.
If the unit is not connected to the compressed air supply, or if the specified overpressure is not
reached, it is impossible to start the VDL vacuum drying oven.