T2 VIA-DU-20 Mode D'emploi page 12

7. Assembly
7.1. Assembly of the control device
This device is installed in a housing to be snapped onto DIN rails (DIN EN 50022-35). It is
designed to be mounted in switchboxes and distribution boxes.
B
The housing has the following measurements: see
7.2. Assembly of the ground temperature and moisture
sensor VIA-DU-S20
The sensor is yellow and can be recognised by its 5-core connection lead.
C
It has the following dimensions: see
The ground temperature and moisture sensor is to be installed within the heated area at
least 2.5 cm away from the heating cables (see diagram).
The sensor must be able to directly detect weather conditions (rain, snow, melted
snow and ice).
The sensor may not be covered up (e.g. when clearing the snow).
Take care that VIA-DU-S20 is not installed in an area which is continuously flooded with
water (e.g. drain line), neither in an area which is continuously under ice due to external
parameters (e.g. freezing of condensation water in cooling rooms).
The piece of wood is placed into the ground surface as a dummy for the sensor.
A metal protective pipe is to be installed up to the wooden piece. The pipe is to be secured
on the wooden piece to prevent concrete, asphalt, etc. from getting in. Once the material
has been put on and if necessary cooled, the piece of wood is removed and the sensor
fitted into the hole. The remaining space around the sensor is to be filled with, for example,
silicon, mortar or asphalt. The temperature of the filling material must not exceed 80°C.
Furthermore, it has to be ensured that there is a good connection without hollow space
between the sensor and the filling material. The sensor connection lead may be extended
2
from 15 m (standard length) to a maximum of 50 m with a diameter of 1.5 mm .
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