Snow Melting Control 680
680_D
05/16
Snow Melting
Replaces: 10/15
Installation & Operation Manual
1 of 48 © 2016 680_D - 05/16
Features
• BACnet or Modbus communication
• Automatic snow/ice detection
• Supports both in-slab and retrofit aerial sensors
• Tandem snow/ice detection
• Energy monitoring
• Idling
• Storm
• EconoMelt
• Warm weather shut down
• Cold weather cut off
• Slab protection
• Exercising
Introduction
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. The 680 uses a tekmar Snow/Ice Sensor 090 or a Snow Sensor 095 to automatically
detect snow or ice on the snow melting slab. 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 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.
BACnet is a registered trademark of ASHRAE. ASHRAE
does not endorse, approve or test products for
compliance with ASHRAE standards. Compliance of
listed products to the requirements of ASHRAE Standard
135 is the responsibility of BACnet International (BI).
BTL is a registered trademark of BI.
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