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Ground system
The ground system is
fully automated. It gathers
information on moisture
and temperature via digital
sensors continuously. The
sensors are placed on stra-
tegic spots on the ground
area (for further information
on the sensor please refer to
the sensor manual). By combining measurements of both moisture and temperature a
reliable detection of the situation is achieved.
Hence it is known whether heating of the ground area is needed in order to avoid that
the ground area is covered by ice and snow.
Standby
The system is on standby awaiting need for heating. If the measured temperature is
below the chosen standby temperature the system will automatically heat the area in
order to maintain the standby temperature.
Melting (heating) will start when the two following conditions are fullled:
• Measured moisture is higher than the chosen limit for moisture.
• Measured temperature is lower than the chosen melting temperature
Temperature and moisture are measured continuously by the sensors.
Melting Ice and snow
As long as the measured temperature is lower than the chosen melting temperature
heating of the ground area will be on. When the measured temperature reaches the
chosen melting temperature and the measured moisture level is below the chosen
limit, the post-heating function will be activated. The post-heating function can be
disabled.
If moisture is detected on the ground area the system will continue to heat the area
in order to maintain the melting temperature. It is, however, important to understand
that even when the system is melting ice and snow it is not necessarily heating at all
times. The heating will be turned on and o in accordance with the measured tempera-
ture in order to maintain a constant melting temperature.
If the temperature rises more than 1.5°C above the chosen melting temperature the
system will automatically stop heating the area irrespective of the moisture on the
area.
Appendix B
Standby
(No heating)
Melting
(Heating)
Post-heating
(Heating)
Standby
Mantaining standby
temperature
(Heating)
Temperature < Melting temperature
and
Moisture > Moisture limit
Moisture < Moisture limit
Temperature <
Standby temperature
Temperature >-
Standby temperature
Poat-heat time elapsed
Temperature > Melting
temperature + 1.5 ˚C
33


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