![background image](http://html.mh-extra.com/html/pentair/raychem-icestop/raychem-icestop_installation-and-operation-manual_1524280047.webp)
43
5
Control, Monitoring and Power
Distribution
Raychem-IM-H58067-IceStopRoofGutterDeIcingCOM-EN 18/01
TABlE 7: CONTROl SySTEMS
RCU-3
The RCU-3 provides control and status dis-
play to the APS–3C controller from a remote
location. It has a 2, 4, 6 or 8 hour CYCLE
TIME adjustment, independent of APS-3C
setting.
RCU-4
The RCU-4 provides control and status dis-
play to the APS-4C controller and SC-40C
Satellite Contactor from a remote location.
It has a 2, 4, 6 or 8 hour CYCLE TIME adjust-
ment, independent of the APS-4C or SC-40C
setting.
Automatic Moisture/Temperature Controller
The most conservative approach from an energy-
consumption point of view is an automatic moisture/
temperature controller. Thermal Management
supplies an automatic moisture/temperature sensor,
which consists of an APS control panel, one or more
GIT-1 gutter sensors, and one or more CIT-1 aerial
snow sensors. The Roof and Gutter De-Icing: IceStop
System Design Guide (H56070) outlines the options
for this approach.
The GIT-1 ice sensor should be mounted in gutters
near downspouts. It senses the actual environmental
conditions, such as temperature and moisture. A
GIT-1 sensor is recommended for each critical area
that needs to be monitored for icing conditions
(such as when one side of a building gets sun in
the morning and the other side gets sun in the
afternoon, or one side gets the prevailing winds and
the other side is protected). A CIT-1 aerial-mounted
snow sensor is also recommended. Having both
gutter and snow sensors allows for snow to begin
melting in the gutters at the onset of any snow or ice
condition.