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5
Control, Monitoring and Power
Distribution
Raychem-IM-H58067-IceStopRoofGutterDeIcingCOM-EN 18/01
5.1
Control Systems
Three control methods are commonly used with roof
de-icing systems:
• Manual control
• Ambient thermostat
• Automatic moisture/temperature controller
All three methods require contactors if any
significant length of heating cable is being used.
The contactor must be sized to carry the load. Each
method offers a trade-off of initial cost versus
energy efficiency and ability to provide effective
de-icing. If the system is not energized when needed,
ice will form. If the system is energized when
de-icing is not needed, there will be unnecessary
power consumption. Choose the control method that
best meets the project performance requirements.
Contact your Thermal Management representative
for details.
For Class I, Division 2 hazardous locations, use an
agency-approved controller or thermostat suitable
for the same area use.
Manual Control
A manually controlled system is operated by a
switch that controls the system power contactor.
This method requires constant supervision to work
effectively.
The type of control you select will affect power
consumption and ensure the heating cable is on
when needed.
Ambient Thermostat
When an ambient sensing thermostat is used, the
roof and gutter system will be energized when the
ambient temperature is below freezing. This will
ensure the heating cable is energized any time the
water might freeze.