Snow Melting Control, BAS, Boiler and Mixing - 680

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

Exercising
Automatic snow/ice detection, supports both in-slab and retrofit aerial sensors
Warm weather shut down, cold weather cut off
Energy monitoring, BACnet or Modbus communication

Specification

Literature: 680_A, 680_B, 680_C, 680_D
Control: Microprocessor control. This is not a safety (limit) control.
Packaged weight: 6.5 lb. (2950 g)
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: PC+ABS plastic with steel conduit connection walls, NEMA type 1
Approvals: CSA C US, meets class B: ICES & FCC Part 15, BTL Listed
Ambient conditions: Indoor use only, 32 to 122°F (0 to 50°C), < 90% RH non-condensing
Power supply: 115 V (ac) ±10%, 60 Hz, 43 VA standby, 320 VA max
Primary, system pump relays: 230 V (ac), 10 A, 1/2 hp
Boiler pump relay: 230 V (ac), 5 A, 1/3 hp
Boiler stage relays: 230 V (ac), 5 A
Boiler modulating output: 0-10 V (dc) 500 O min impedance / 4-20 mA 1 kO max impedance
Injection mixing pump: 230 V (ac), 2.4 A
Floating mixing output: 230 V (ac), 5 A
Analog mixing output: 0-10 V (dc) 500 O min impedance / 4-20 mA 1 kO max impedance
Flow sensor: 4-20 mA, 20 V (dc) power supply by control
Pressure sensor: 0.5-4.5 V (dc) ratiometric, 10 kO min load, 5 V (dc) power supply by control
Communications: BACnet IP, BACnet MSTP, Modbus MSTP
Sensors: NTC thermistor, 10 kohm @ 77°F (25°C ±0.2°C) ß=3892
–Included: Outdoor Sensor 070 and 3 of Universal Sensor 082
–Optional: tekmar type: 072, 073, 082, 090, 094, 095
Warranty: Limited 3 Year (See 680_D for full warranty)