WarmlyYours SCP-120 - Manual (Page 8)

OPERATION
SCP-120
The snow melting system can be monitored and controlled either locally from the SCP-120 itself
or from two remote locations including:
• RCO Remote Control Unit
• BEMC
Local Control from the SCP-120
Indicators:
• SUPPLY (green) shows that power is present.
• SNOW (yellow) shows that there is a snow/ice signal originating from at least one of the sen-
sors attached to the system.
• HEAT (yellow) shows that there is a call for heat. This happens during snow and for the hold-
on time thereafter or when the heater cycle switch is operated.
• EMC (yellow) shows that the interfaced Energy Management Computer is presently overriding
local system control.
• TEMP LIMIT (red) shows that either the pavement temperature is above the set HIGH TEM-
PERATURE LIMIT and there is a call for HEAT or the ambient air temperature is above the set HIGH
TEMPERATURE LIMIT. The SCP-120 can be confi gured to monitor slab temperature or ambient air
temperature but not both.
Adjustments:
• HOLD-ON TIME adjustment sets the time that heaters operate after snow stops. Doing this is
necessary to make certain the pavement dries before heating ceases. This prevents refreezing. Try
an initial setting of 3-5 hours. Increase, if necessary. Reduce with care since energy savings are be-
ing traded for an increased likelihood of refreezing.
• HIGH-LIMIT TEMPERATURE adjustment sets the maximum deicing temperature.
Switches:
• HEATER CYCLE switch momentarily toggled down will start a manual heater cycle for the set
HOLD-ON TIME or restart the HEATER CYCLE if on was already in progress. Momentarily toggled
up will cancel a heater cycle if one is in progress.
Remote Control from the RCO
Indicators:
• SUPPLY (green) shows that power is present.
• HEAT (yellow) shows that there is a call for heat. This happens during snow and for the hold-
on time thereafter or when the heater cycle switch is operated.
Adjustments:
• CYCLE TIME adjustment sets the time heaters will operate when HEATER CYCLE switch is
momentarily depressed at the RCO.