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ManualsBrandsTekmar ManualsThermostats & ControlsSnow Melting Control - Outdoor Temperature Reset - Speed Injection Mixing

Integrating Automatic Snow Melting with

Building Automation Systems

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.

The 680 communicates with Building Automation Systems using BACnet

or Modbus

for alert notification, remote monitoring and adjustment capability. It 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 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 meter.

Snow Melting Control 680

BAS, Boiler & Mixing

A Watts Water Technologies Company

SetpointSnow MeltingZoning

Alternative EnergyMulti-Staging

HVAC Systems

1–3/4"

(45mm)

2–3/4"

(70mm)

2–7/8"

(74mm)

11–1/8"

(282mm)

2–7/8"

(74mm)

8–1/16"

(204mm)

• Automatic snow/ice detection

• Supports both inslab & retrofit aerial

sensors

• BACnet

or Modbus

communication

• Energy monitoring

• Warm weather shut down

• Cold weather cut out

• Slab protection

• Idling

• Storm

• Tandem snow/ice detection

• EconoMelt

Featuring the Best in Snow Melting Control

Summary of content (2 pages)

PAGE 1
Snow Melting Control 680 BAS, Boiler & Mixing Integrating Automatic Snow Melting with Building Automation Systems 2–3/4" (70mm) 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 1–3/4" (45mm) entrances, parking ramps, loading docks, hospital entrances, helipads and car wash bays.
PAGE 2
Sample Application Drawings Snow Melting Control 680 Outdoor Sensor Building Automation System Hydronic Boiler and Mixing A snow melting system is heated using a hydronic boiler and mixing valve. When snow or ice is detected, the control operates the boiler and mixing valve to heat the slab to the melting temperature. The mixing valve protects the boiler from damage caused by cold return temperatures.