Install Instructions

Correct placing of the sensor(s) is important for the system to work as intended.
The number of roof sensors:
1) The more sensors you add to your system the better the performance.
2) The basic principle is to place one sensor where the snow/ice will appear first (for fast
detection) and one sensor where the snow/ice will disappear last (for complete melting). If it is
not obvious just place the sensors as far apart from each other as possible.
3) With more than two sensors it is also possible to cover problem spots where snow usually is
not detected or where snow is not completely melted when the system stops.
Installing Roof Sensors
1) The sensor should be installed in the heated surroundings most often in the roof gutter, but it
could also be installed on the roof in special applications.
2) The sensor should be located where the first water and snow is expected to “hit” the roof
gutter. Make sure the sensor is placed in an open environment, and is not covered by trees,
other buildings, shadows etc., and preferably where ice and snow usually cause the most
problems.
3) There is no general recommendation for placing a sensor with regards to direction (N, S, E, W).
Based on experience the most likely position is in the North or Northwest roof gutter.
Installing an Individual Roof Sensor
Roof System
Down Pipe
Roof Gutter
Sensor
GX 850 ACP
(Max 4 sensors per GX 850 Dual Zone ACP)
CD-ST
Presetting
2
CD-ST
Presetting
2
Copyright 2009 Danfoss Inc.
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EFH.IM.GX850 - 11/2009