WarmlyYours SCP-120 - Manual (Page 9)

Switches:
• HEATER CYCLE switch momentarily depressed will start a manual heater cycle for the set
CYCLE TIME. Momentarily depressed while heaters are being operated by a hold-on timer or dur-
ing manual heater cycle will end the heater cycle. Heater operation during snow conditions cannot be
canceled in this manner.
Remote Control from the EMC Interface
Please see the EMC section of the manual for interface details.
Energy Management Computer (EMC) Interface
The SCP-120 Series provides an EMC interface to communicate with the EMC of building auto-
mation systems. The EMC interface provides 10 mA dry switch contacts for communicating status to
the EMC or starting or stopping the system from the EMC.
EMC interface outputs:
• Output Common
• HEAT indicates 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.
• SNOW indicates that there is a snow/ice signal originating from AIR-SS sensor attached to the
system.
• ALARM
• SUPPLY indicates that power is present.
• TEMP LIMIT indicates that either the pavement temperature is above
the set HIGH TEMPERATURE LIMIT and there is a call for HEAT or the ambient air temperature is
above the set HIGH TEMERATURE LIMIT. An SCP-120 Series control can be confi gured to monitor
slab temperature or ambient air temperature but not both.
EMC interface inputs:
• OVERRIDE ON can be used to override an attached SCP-120 control in order to turn heaters
on. A normal contact closure will turn on heaters until operation is cancelled. If the EMC cycles the
OVERIDE ON relay on and off again within more than 32 milliseconds but less than 300 milliseconds
the attached APS “C” Series control will begin a manual heater cycle and run for the HOLD-ON TIME
set at the panel.
• OVERRIDE OFF can be used to override an attached SCP-120 control in order to turn heat-
ers off. A normal contact closure will turn off heaters. If the EMC cycles the OVERIDE OFF relay on
and off again within more than 32 milliseconds but less than 300 milliseconds the attached SCP-120
control will end a manual heater cycle.