Binder VDL 23 User Manual

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VDL (E3.1) 10/2020 Page 86/196

9.3 Sweeping the area for electrical equipment, the preheating chamber, and

the controller housing (triangular instrument box) with compressed air

To sweep the area for electrical equipment, the preheating chamber, and the controller housing, activate

the customer's compressed air supply.

The compressed air supply line provided by the operator must be equipped with active moni-

toring of the defined inlet pressure (2 bar), which clearly indicates a drop and increase in the

inlet pressure outside the permissible tolerance of ±0.2 bar.

9.3.1 Setting the pressure regulator for sweeping with compressed air

After opening the pressure regulator on the chamber rear (turn clockwise), the area for electrical equipment

of the oven, the preheating chamber (the heater area between the inner and outer chamber) and the con-

troller housing will be swept. Compressed air is used and then released into the surrounding atmosphere

independent of the oven’s operating state.

Compressed air sweeping must be in operation for a defined time (chap. 9.3.2) before turning on the cham-

ber. It remains in operation during the entire use of the chamber (loading, drying, removal of the material

to be dried), with an overpressure of at least 25 Pa (recommendation: >40 Pa). This operating point is

defined on the pressure regulator when the clamping ring touches the upper stop. After terminating the

drying procedure and turning off the chamber it is recommended to continue sweeping for approx. 10

minutes.

On the chamber front there is an analog pressure display (manometer) to show the existing overpressure.

(11) (9) (10)

Figure 22: Pressure regulator and sweeping plug

for compressed air sweeping on the chamber rear

Figure 23: analog pressure display (manometer)

for compressed air sweeping on the chamber

front

(9) Pressure regulator for compressed air sweeping

(10) Connection for compressed air sweeping / overpressure

(11) Outlet with sweeping plug for compressed air sweeping before start-up

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Binder VDL 23 Vacuum drying