Application; Function; Display And Controls - nVent RAYCHEM VIA-DU-20 Mode D'emploi

1. APPLICATION

The VIA-DU-20 is an electronic control device designed to regulate nVent RAYCHEM ramp heating systems in garage
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driveways, staircases, inclines etc. The buried heating cable is controlled by sensing both ground temperature and
moisture. The heater operates only when the temperature falls below the set value and there is moisture. Use of this
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controller results in significant energy savings if compared to other devices that regulate according to temperature only.
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2. FUNCTION

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RU The ground temperature and moisture are measured with the help of one sensor.
The sensor is heated so that it can also measure dry snow.
The control device evaluates the data from the sensor and switches the heating on, if the ground temperature falls
below a value set by menu and the ground moisture exceeds a value set by menu.
In addition the device is capable of identifying a risk of freezing rain. This function serves to switch the heating on
when freezing rain is predicted.
The controller also has what is called an overruling entry. This can be configured using the menu and serves to
prevent over-loading or to allow the device to be controlled remotely via the BMS.

3. DISPLAY AND CONTROLS

The device has a display which is lit when the device is being operated (see A). Under normal operating conditions
the device alternately shows the moisture, the ground and air temperature and the status of the heating output
(on/off). Only the values, which are relevant for controlling, are shown. Air temperature e.g. is only shown, if "sleet
precaution" is set to "local detection".
Testing the device / switch on the heating output
Selecting a language
Increasing the value selected, changing settings (forwards)
Reducing the value selected, changing settings (backwards)
Enter menu, exit menu
Confirm the value selected, select the next value and responding to fault
messages.
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