Danfoss EFIT 850, Installation And User Manual, Page: 4 / 36

4
User Manual
When more than 1 area is controlled by the EFIT™ 850 system, it is also possible to
prioritize the areas . Prioritizing makes it possible to operate 2 areas, even if the needed
power for 2 areas is not present .
The EFIT™ 850 is fully automatic and operated digitally by means of the intelligent sen-
sors located in the heated terrain . Each sensor measures both temperature and mois-
ture, and the system turns the heating elements on and off based on these readings . By
combining moisture and temperature readings, the system is able to save around 75%
energy compared to systems which only measure temperature readings . The digital
sensors used for the EFIT™ 850 also provide the most exact readings when compared
with corresponding analogue systems . The result is optimum functionality and low
energy consumption .
A typical installation consists of:
•
Controller unit
(only one)
This is the device which, based on the measure-
ments from the sensors, decides when to heat the
connected area(s) .
•
Power supply
(one or more)
The power supply delivers power to the controller
unit and the connected sensors .
•
Ground sensor
(one or more)
At least 1 ground sensor is needed for each
ground area, but to get the best performance of a
system, 2 or more sensors are recommended .
For more information please refer to the sensor
manual .
•
Roof sensor
(one or more)
At least 1 roof sensor is needed for each roof area,
but for complex roof constructions, 2 or more sen-
sors are recommended .
For more information please refer to the sensor
manual .
For more information about the ice and snow melting function of the EFIT™ 850, please
refer to: Appendix B: “How it works” .