WarmlyYours SCP-120 - Manual (Page 5)

Figure 2: SCP-120 front
panel detail
RCO Remote Control Unit
The RCO Remote Control Unit is used with the SCP-120. It adds remote control and status
display to the SCP-120 control at a location convenient to personnel capable of observing snow
melting system operation.
Snow, slush or ice, either alone or in combination, must contact at least one sensor to start
melting. Heater operation continues until all sensors are dry. Depending on the rate of fall, snow
density, wind velocity, and other factors, heater operation must continue for a period of time after the
last sensor dries off. Slush tracked by vehicle and pedestrian traffi c along with blowing and drifting
snow are problems that are hard to predict.
The cycle timer in the SCP-120 begins when the last sensor dries off and continues for an
adjustable period of up to 10 hours to keep the heaters operational until the pavement is completely
dry. Otherwise, residual water could re-freeze and create a hazardous condition.
The RCO provides a two, four, six or eight hour CYCLE TIME adjustment that is independent of the
cycle time in the SCP-120. This allows treatment of the condition requiring an additional heater cycle
as the exception rather than the rule in order to minimize energy use.