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Installation Instruction
Ground system
The ground system is fully automated.
It gathers information on moisture and
temperature via digital sensors continu-
ously. The sensors are placed on strategic
spots on the ground area (for further
information on the sensor please refer to
the sensor manual). By combining meas-
urements of both moisture and tempera-
ture a reliable detection of the situation
is achieved. Hence it is known whether
heating is required to prevent ice and snow from covering the roof area.
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 tem-
perature.
Melting (heating) will start when the two following conditions are fulfilled:
•
Measured moisture is higher than the chosen setpoint 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 main-
tain 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 off in
accordance with the measured temperature in order to maintain a constant melting temperature.
If the temperature rises more than 35°F (1.5°C) above the chosen melting temperature the system will
automatically stop heating the area irrespective of the moisture on the area.
VUAPA422
GX-850M ver. IV
Standby
(No heating)
Temperature < Melting temperature
and
Moisture > Moisture limit
Melting
(Heating)
Moisture < Moisture limit
Post-heating
(Heating)
Temperature <
Standby tempera-
Standby
ture
Temperature >-
Mantaining standby
Standby tempera-
ture
temperature
(Heating)
© Danfos 2018.10 | 33
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