ensto ECO900 Instructions De Montage Et D'utilisation page 20

5. Installation of sensors
5.1 sensors for ground installation ECOA901 and ECOA902
Figure 8 shows the minimum installation distances. The snow and ice sensor ECOA901 (5 leads) is installed at
least 200 mm outside the heated area. The humidity and temperature sensor ECOA902 (4 leads) is installed in-
side the heated area, because the sensor is used to measure the temperature and humidity level on the surface
of the heated area. The heating cables must be at least 25 mm from the ECOA902 sensor.
The sensors must be installed so that they are directly exposed to weather conditions (snow, rain, melt water).
However, the sensors should not be installed in a place where e.g. snow from a snow plough can cover them.
Additionally, dirt on top of the sensor will prevent proper operation. The ground sensors must lie in a horizon-
tal position even if they are installed on a slope (figure 9).
The sensor is supplied with a metal base plate and a wooden mould. The metal base plate is set in the ground
during the construction phase and the wooden mould is placed on top. A metal protective tube must be
installed to the wooden block for the connection cable. Seal the tube ends to avoid surfacing materials (e.g.
tar, concrete) clogging the tube. After applying the surface, the wooden mould is removed and the sensor is
attached on the steel plate with a M6 x 35mm screw. Any gaps around the sensor should be filled with e.g.
silicone, mortar or suchlike. The highest permissible temperature of the filler
is 80 °C.
The connection cable can be extended to 50 meters by using a 1.5 mm
with numbered leads for the extension as it is very helpful for example when trying to locate faults during a
malfunction. The sensors work with low voltage, so it is recommended that their leads are installed at a suf-
ficiently long distance from the heating circuit supply cables.
Figure 10 shows a cross-section of the sensors to be installed in the ground:
1 Steel plate for installation
2 Attachment screw M6 x 35mm
3 Ground sensor ECOA901 or ECOA902
4 Filler
5 Metal protective tube for connection cable
6 Watertight junction box
7 Surfacing
5.2 Sensor for installation in rainwater gutters ECOA903
The snow and ice sensor ECOA903 is installed between the heating cables in a rainwater gutter and attached
by cable clamp or adhesive (neither one is supplied with the equipment). The sensor must not be in contact
with the heating cables. The sensor is installed in the same direction as the water flow in the gutter with the
two metal pipes upwards. It is recommended to install the sensor at the lowest point of the gutter near the
drainpipe. The water running off is led to the sensor surface by extruded strips. The strips can be cut to fit the
existing conditions of the gutter.
The connection cable can be extended to 50 meters by using a 1.5 mm
with numbered leads for the extension as it is very helpful for example when trying to locate faults during a
malfunction.
Figure 11 shows the installation of the snow and ice sensor ECO903 and the air temperature sensor ECOA904:
1 Air temperature sensor ECOA904
2 Sensor ECOA904 clamp
3 Rainwater gutter
4 Sensor ECOA903 clamp
5 Snow and ice sensor ECOA903
6 Heating cables
7 Direction of water flow
20 / 56
2
2
RAK41 / 15.3.2022
cable. It is recommended to use a cable
cable. It is recommended to use a cable