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1. Application
The VIA-DU-20 is a CE certified, electronic control device designed to regulate T2 ramp
heating systems in garage 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 controller
results in significant energy savings if compared to other devices that regulate according to
temperature only.
2. Function
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 and the status of the
heating output (on/off) as well as the ground and air temperature*.
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)
Selecting a menu
Confirm the value selected, select the next value and responding to fault
messages.
* The air temperature is indicated only when "local detection" is selected.
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