Snow Melting Control - BAS, Boiler & Mixing The Snow Melting Control 680 is designed to operate electric or hydronic equipment to melt snow or ice from any surface including driveways, walkways, business entrances, parking ramps, loading docks, hospital entrances, helipads and car wash bays. It communicates with Building Automation Systems using BACnet® or Modbus ® for alert notification, remote monitoring and adjustment capability. Up to two snow/ice sensors can be installed, thereby increasing detection area and providing backup redundancy in the case of sensor failure. Upon detection of snow or ice, the 680 operates an electric heating cable, a single hydronic condensing or non-condensing boiler, or a steam valve to provide heat to the snow melt load. The 680 provides boiler return protection by operating a mixing valve or variable speed injection mixing. Monitoring of energy consumption is possible when it is connected to an optional flow sensor. Features Idling Tandem snow/ice detection Slab protection Exercising Automatic snow/ice detection, supports both in-slab and retrofit aerial sensors EconoMelt Storm Energy monitoring, BACnet or Modbus communication Warm weather shut down, cold weather cut off Agency Approvals CSA C US, meets class B: ICES & FCC Part 15, BTL Listed Ambient Conditions Indoor use only, 32 to 122 degree F (0 to 50 degree C), less than 90 percent RH non-condensing Analog Mixing Output 0-10 V (dc) 500 ohms min impedance / 4-20 mA 1 k ohms max impedance Boiler Modulation Output 0-10 V (dc) 500 ohms min impedance / 4-20 mA 1 k ohms max impedance Boiler Pump Relay 230 V (ac), 5 A, 1/3 hp Boiler Stage Relay 230 V (ac), 5 A Communications Type BACnet IP, BACnet MSTP, Modbus MSTP Control Type Microprocessor control, this is not a safety (limit) control Dimensions 8-1/16" H x 11-1/8" W x 2-15/16" D (204 x 282 x 74 mm) Display 3-1/4" color touchscreen, 320 x 205 pixels Enclosure Material PC+ABS plastic with steel conduit connection walls Enclosure NEMA Rating NEMA 1 Floating Mixing Output 230 V (ac), 5 A Flow Sensor 4-20 mA, 20 V (dc) power supply by control Injection Mixing Pump 230 V (ac), 2.4 A Power Supply 115 V (ac) plus / minus 10 percent, 60 Hz, 43 VA standby, 320 VA max Pressure Sensor 0.5 - 4.5 V (dc) ratiometric, 10k ohms min load, 5 V (dc) power supply by control Primary - System Pump Relay 230 V (ac), 10 A, 1/2 hp Sensor NTC thermistor, 10 k ohms at 77 degree F (25 degree Cplus / minus 0.2 degree C) Beta =3892 Snow Melting Control Type Snow Melting Control Resources Datasheet Installation Instructions More Info
