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

S
Sarah LeblancSep 16, 2025
How do I fix a 'SNOW SENSOR 2 BROWN WIRE SHORT CIRCUIT ERROR' on my Tekmar 680?
- A
  Aaron BerrySep 16, 2025
  The control is unable to read the brown wire connected to the Snow/Ice Sensor 090 or 094 on terminals 24 and 25 due to a short circuit. Check the snow/ice sensor 2 brown and black wires for short circuits according to the sensor installation manual. Replacing the sensor might be necessary.
C
conniemeltonSep 17, 2025
What should I do if my Tekmar Melting Machines displays 'SNOW/ICE SENSOR 2 ERROR'?
- M
  Ms. Dawn Reilly PhDSep 17, 2025
  Check the snow/ice sensor 2 brown, yellow, red and black wires according to the sensor installation manual. It is important to check any cable splices for loose wiring connections. Replacing the sensor may be necessary.
J
Jessica TaylorSep 18, 2025
How to solve SETPOINTS MENU SAVE ERROR on Tekmar 680 Melting Machines?
- B
  belljaniceSep 18, 2025
  Set the access level to Installer and check all settings in the Setpoints menu.
J
jamescolemanSep 18, 2025
How to solve SYSTEM SETUP MENU SAVE ERROR on Tekmar 680 Melting Machines?
- A
  alexandra87Sep 19, 2025
  Set the access level to Installer and check all settings in the System Setup menu.
A
alicia77Sep 23, 2025
How to solve BOILER SETUP MENU SAVE ERROR on Tekmar 680?
- D
  daniel37Sep 23, 2025
  Set the access level to Installer and check all settings in the Boiler Setup menu.
Y
yvonne09Sep 23, 2025
How to solve MIXING SETUP MENU SAVE ERROR on Tekmar Melting Machines?
- W
  wyattlisaSep 23, 2025
  Set the access level to Installer and check all settings in the Mixing Setup menu.
A
Amanda KleinSep 23, 2025
How to solve BAS MENU SAVE ERROR on Tekmar 680 Melting Machines?
- M
  Michele WilsonSep 23, 2025
  Set the access level to Installer and check all settings in the BAS menu.
S
Sandra KingAug 23, 2025
Why does my Tekmar 680 say 'LOW PRESSURE ALERT'?
- C
  Carmen JonesAug 23, 2025
  The 'LOW PRESSURE ALERT' indicates that the snow melting system may have a leak. You should fix any leaks and make sure that the glycol solution hasn't been diluted with water.
C
Christopher SchwartzSep 6, 2025
How to fix a 'SLAB 1 SENSOR SHORT CIRCUIT ERROR' on Tekmar 680 Melting Machines?
- R
  Robert AndersonSep 6, 2025
  The control is unable to read the Slab Sensor 072 or 073 on terminals 19 and 20 because of a short circuit. To fix this, check the slab sensor 1 wire for short circuits according to the sensor installation manual. Replacing the slab sensor might be necessary.
E
Elizabeth ThomasSep 5, 2025
What causes the 'SLAB 1 SENSOR OPEN CIRCUIT ERROR' on my Tekmar 680?
- J
  Joshua GibbsSep 5, 2025
  The control is unable to read the Slab Sensor 072 or 073 on terminals 19 and 20 because of an open circuit. Check the slab sensor 1 wire for open circuits according to the sensor installation manual. If necessary, replace the slab sensor.