Tekmar 680 - User Manual

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Snow Melting Control 680

680_D

05/16

Snow Melting

Replaces: 10/15

Installation & Operation Manual

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.

Main Page

Questions and Answers

M
Michele HicksSep 4, 2025
How to resolve 'BOILER RETURN SENSOR SHORT CIRCUIT ERROR' on Tekmar 680 Melting Machines?
- V
  Victoria JonesSep 4, 2025
  The control is unable to read the Boiler Return Sensor 082 on terminals 8 and 10 because there is a short circuit. Check the boiler return sensor wire for short circuits according to the sensor installation manual. If needed, replace the boiler return sensor.
J
jessicasteeleSep 3, 2025
What should I do if my Tekmar 680 Melting Machines displays a 'BOILER RETURN SENSOR OPEN CIRCUIT ERROR'?
- J
  Jeffrey SanchezSep 3, 2025
  The control cannot read the Boiler Return Sensor 082 on terminals 8 and 10 because of an open circuit. Check the boiler return sensor wire for open circuits according to the sensor installation manual. It may be necessary to replace the boiler return sensor.
J
Jonathon FordSep 2, 2025
How do I troubleshoot a 'BOILER SUPPLY SENSOR SHORT CIRCUIT ERROR' on a Tekmar Melting Machines?
- A
  Alexis PughSep 2, 2025
  The control is unable to read the Boiler Supply Sensor 082 on terminals 8 and 9 because of a short circuit. Check the boiler supply sensor wire for short circuits according to the sensor installation manual. You might need to replace the boiler supply sensor.
T
Timothy AcevedoSep 1, 2025
What does 'BOILER SUPPLY SENSOR OPEN CIRCUIT ERROR' mean on my Tekmar 680?
- J
  Jason LivingstonSep 1, 2025
  This error indicates that the control is unable to read the Boiler Supply Sensor 082 on terminals 8 and 9 due to an open circuit. Check the boiler supply sensor wire for open circuits according to the sensor installation manual. If necessary, replace the boiler supply sensor.
W
Wendy DoughertyAug 31, 2025
How do I address a 'SYSTEM RETURN SENSOR SHORT CIRCUIT ERROR' on my Tekmar 680?
- K
  Kaitlyn KruegerAug 31, 2025
  The control is unable to read the System Return Sensor 082 on terminals 11 and 13 because of a short circuit. Check the system return sensor wire for short circuits according to the sensor installation manual. It may be necessary to replace the system return sensor.
M
Meghan GriffithAug 30, 2025
What causes 'SYSTEM RETURN SENSOR OPEN CIRCUIT ERROR' on Tekmar 680?
- R
  Rebecca BowmanAug 30, 2025
  This error means that the control cannot read the System Return Sensor 082 on terminals 11 and 13 due to an open circuit. You should check the system return sensor wire for open circuits as described in the sensor installation manual. If needed, replace the system return sensor.
A
anthony52Aug 29, 2025
How to fix 'SYSTEM SUPPLY SENSOR SHORT CIRCUIT ERROR' in Tekmar 680?
- A
  Ashley BrownAug 29, 2025
  The control is unable to read the System Supply Sensor 082 on terminals 11 and 12 because of a short circuit. Check the system supply sensor wire for short circuits according to the sensor installation manual. Replacing the system supply sensor may be necessary.
W
William RogersAug 28, 2025
How to resolve a 'SYSTEM SUPPLY SENSOR OPEN CIRCUIT ERROR' on Tekmar 680?
- K
  Kevin DuranAug 28, 2025
  The control can't read the System Supply Sensor 082 on terminals 11 and 12 because of an open circuit. Check the system supply sensor wire for open circuits according to the sensor installation manual. It might be necessary to replace the system supply sensor.
D
Derek HarringtonAug 27, 2025
How do I troubleshoot a 'OUTDOOR SENSOR SHORT CIRCUIT ERROR' on my Tekmar 680 Melting Machines?
- R
  Randall ShepherdAug 28, 2025
  The control is unable to read the Outdoor Sensor 070 on terminals 14 and 15 because of a short circuit. Check the outdoor sensor wire for short circuits as described in the sensor installation manual. You might need to replace the outdoor sensor.
D
Dr. Laura MaysAug 27, 2025
How to fix a 'OUTDOOR SENSOR OPEN CIRCUIT ERROR' on Tekmar Melting Machines?
- L
  Lisa GregoryAug 27, 2025
  The control cannot read the Outdoor Sensor 070 on terminals 14 and 15 because of an open circuit. Check the outdoor sensor wire for open circuits according to the sensor installation manual. Replacing the outdoor sensor might be required.