Installation & Operation Manual 670_ D WiFi Snow Melting Control 670 10/16 Snow Melting Replaces: New Introduction The WiFi Snow Melting Control 670 operates hydronic and electric heating equipment designed to melt snow and/or ice from roads and walkway surfaces. The control works with the tekmar Snow/Ice Sensor 090 or Snow Sensor 095 to automatically detect snow or ice and operates a single boiler, steam valve, or electric cable to supply heat to the slab.
Table of Contents Important Safety Information..............................................3 Installation..........................................................................4 Preparation..................................................................... 4 Packaging Contents....................................................... 4 Physical Dimensions...................................................... 4 Installation Location........................................................
Important Safety Information It is your responsibility to ensure that this control is safely installed according to all applicable codes and standards. tekmar is not responsible for damages resulting from improper installation and/or maintenance. This is a safety-alert symbol. The safety alert symbol is shown alone or used with a signal word (DANGER, WARNING, or CAUTION), a pictorial and/or a safety message to identify hazards.
Installation Preparation Tools Required-----------------------------------------------------------------------------------------• tekmar or jeweler screwdriver • Phillips head screwdriver • Needle-nose pliers • Wire stripper Materials Required-------------------------------------------------------------------------------------• 18 AWG LVT solid wire (low-voltage connections) • 14 AWG solid wire (line-voltage connections) • Four 1/8" - 1" wood screws Packaging Contents • 1 Application Brochure 670_A • 1
Installing the Enclosure • Install the control enclosure to a wall or to an electrical box. • Three wiring chamber dividers are included. The dividers provide a barrier to keep low voltage wiring separated from line voltage wiring. • If the dividers are not used, then low voltage circuits must use wire rated at least 300 V. Press down at the fingertip grips on top of the front cover and pull out and down. Lift the front cover up and away from the control.
Rough-In Wiring To prevent the risk of personal injury and/or death, make sure power is not applied to the control until it is fully installed and ready for final testing. All work must be done with power to the circuit being worked on turned off. Please be aware local codes may require this control to be installed or connected by an electrician. • Install the supplied wiring compartment barriers by sliding them into the grooves provided to isolate the low and linevoltage wiring.
Sensor Wiring Mounting the Outdoor Sensor--------------------------------------------------------------------------• The temperature sensor (thermistor) is built into the sensor enclosure. • The outdoor sensor can either be mounted directly onto a wall and the wiring should enter through the back or bottom of the enclosure. Do not mount the outdoor sensor with the conduit knockout facing upwards because rain could enter the enclosure and damage the sensor.
Mounting the Boiler and System Sensors--------------------------------------------------------------The Universal Sensor 082 is designed to mount on a pipe or in a temperature immersion well. The sensor should be placed downstream of a pump or after an elbow or similar fitting. This is especially important if large-diameter pipes are used as the thermal stratification within the pipe can result in erroneous sensor readings.
Snow/Ice Sensor---------------------------------------------------------------------------------------A Snow/Ice Sensor 090 or 094 can be connected to the control. The 090 has a 65' (20 m) cable and the 094 has a 208' (63 m) cable. The cable may be extended to a total length of 500' (150 m) using 18 AWG cable. Any junction boxes must kept dry. 6 7 8 9 10 Red Blk/ Blu Yel Brn/ Com Slab If the Snow/Ice Sensor input is used: • Connect the red wire to terminal 6. • Connect the black wire to terminal 7.
Manual Melt Input The manual melt input allows the control to be manually switched to melting operation using a switch. This connection is optional. 13 14 Man Com Melt If the Manual Melt input is used: Connect a switch to terminals 13 and 14. The switch may be either dry (no voltage) or a voltage signal up to 32 V (ac).
Wiring to a Modulating Boiler--------------------------------------------------------------------------The control provides either a 4-20 mA or a 0-10 V (dc) output to the boiler. Polarity must be observed. • Connect the Mod + terminal from the boiler to terminal 19. • Connect the Mod - terminal from the boiler to terminal 20. • Some modulating boilers require an enable to start firing the boiler. Connect the boiler enable to the stage 1 terminals 21 and 22.
Wiring the Heat Relay----------------------------------------------------------------------------------25 26 If the heat relay is operating a pump: The pump can be rated up to 230 V (ac), 5 A, 1/3 hp and switched through terminals 25 and 26. For simplicity in wiring and troubleshooting, a separate breaker for each pump is recommended. • Connect the power source line wire (L) to terminal 26. • Connect a wire from terminal 25 to the pump L. • Connect a wire from the pump N back to the power source neutral.
Testing the Sensor Wiring A good quality test meter capable of measuring up to 5,000 kΩ (1 kΩ = 1000 Ω) is required to measure the sensor resistance. In addition, the actual temperature must be measured with either a high-quality digital thermometer, or if a thermometer is not available, a second sensor can be placed alongside the one to be tested and the readings compared. First, measure the temperature using the thermometer and then measure the resistance of the sensor at the control.
For the Mix Output – Analog Mixing • Use an electrical meter set to measure V (dc) or mA. • Set the Mix Output to 100%. • The voltage between the + and – wiring terminals should be 10 V (dc) or 20 mA. • Set the Mix Output to 0%. • The voltage between the + and – wiring terminals should be 0 V (dc) or 4 mA. For the Mix Output – Variable Speed Injection Mixing • Use an electrical meter set to measure V (ac). • Set the Mix Output to 100%.
User Interface Home Screen Information about slab and outdoor conditions Remaining melting run time System operation information View status of sensor readings and equipment. Go to settings menu to setup control System Operation SYSTEM IS MELTING • The control has either detected snow/ice and automatically started or the control was manually started. • "Warming Up" is shown when the slab is below the slab target temperature.
Symbols ! WARNING SYMBOL The control has a error message. Press the warning symbol to determine the error code and information on how to take corrective action. Refer to the Troubleshooting section for a list of error codes. Help Screen The display includes a Help screen for each setting. The Help screen provides a description of the setting that is identical to the description found in the Installation and Operation Manual. Status Menu Navigation Step 1: Press the Status button on the Home Screen.
System Status Menu Description Range Access MANUAL MELT INPUT When Manual Melt wiring terminal 13 is shorted to common wiring terminal 14, the control is enabled and enters the melting operation unless prevented by warm weather shut down or cold weather cut out. When the manual melt input is disconnected, the control completes the melting cycle and then returns to off, idle or storm operation.
Slab Status Screen Description Range Access OUTDOOR – – –, Current outdoor air temperature as measured by the outdoor sensor or from the tekmarNet system or Internet weather forecast. “– – –” is displayed when no outdoor temperature reading -67 to 149°F is available. (-55.0 to 65.0°C) Conditions: Always available. User Installer SLAB TARGET The slab target calculated by the control based on outdoor temperature and the melting, idling, or storm setpoints. “- - -” is displayed when no heat is required.
Settings Menu Navigation Step 1: Press the Settings button on the Home Screen. Step 2: Press one of the ten buttons. Step 3: Press up or down buttons to scroll through the list. Step 4: Press the highlighted setting name to change the setting value.
Temp Menu Description Range Access MELTING SETPOINT Select the desired temperature of the snow melt surface when melting. Conditions: Always available. 32 to 95°F (0.0 to 35.0°C) Default = 36°F (2.0°C) User Installer IDLING SETPOINT Select the desired temperature of the snow melt surface when idling. Idling preheats the slab when the slab is dry but cold and allows faster reaction time to reach the melting temperature when snow is detected. Recommended for commercial use only.
Away Menu At Home Select at home to allow automatic snow melting operation. Away Select away to prevent snow melting operation and save energy. The home/away changes devices system-wide. All thermostats and controls that are grouped together as a location on the tekmar Connect mobile app will change together. All thermostats and controls on a tekmarNet system will also change together. Display Menu Description TEMPERATURE UNITS Select Fahrenheit or Celsius temperature units.
WiFi Menu Before using the WiFi features of this product, you must accept the Terms of Use, as amended from time to time and available at WattsWater.com/Terms-of-Use. If you do not accept these terms, this product can still be used without WiFi features.
Energy Menu View the snow melting system running hours in the past week. View the snow melting system running hours in the past year.
Monitor Menu Description Range Access 0 to 999999 kWh User Installer MELTING HOURS Records the number of melting hours since the counter was last reset. Conditions: Always available. 0 to 999999 hours User Installer HEAT HOURS Records the number of hours the boiler fired or the electric cable heated since the counter was last reset. Conditions: Available when Application Mode is Boiler, Boiler+Mix and Electric.
Setup – System Setup Menu Description Range APPLICATION MODE The Application Mode selects the operation of the mechanical equipment. Application Mode “PWM Zone” operates a pump or zone valve to provide heat to the snow melting system. Application Mode “Mixing” operates a mixing valve or a variable speed injection mixing pump to heat the snow melting system. The heat source is enabled. Application Mode “Boiler” operates a modulating, 1-stage or 2-stage boiler to heat the snow melting system.
Setup – Boiler Setup Menu Description Range Access BOILER TYPE Select the type of boiler operated by the control. Mod = Modulating boiler with an adjustable firing rate using a 0-10V (dc) or 4-20 mA signal. 1 Stage = Single one-stage on/off boiler. 2 Stage = Single two-stage on/off boiler. EMS = Modulating boiler with an adjustable target temperature using a 0-10V (dc) or 4-20 mA signal. Enable = Enable for Application Mode PWM Zone or Mix. Control = Call for heat to tekmarNet control.
Setup – Mixing Setup Menu Description Range Access MIXING TYPE Select the mixing output type. Floating, Floating = Floating action mixing output to operate a mixing valve. Injection, Injection = Injection mixing output to operate a wet-rotor, impedance protected pump with a current 0-10 V, less than 2.4 A. 4-20 mA 0-10 V = Analog mixing output provides a 0-10 V (dc) signal. Default = Floating 4-20 mA = Analog mixing output provides a 4-20 mA signal.
tekmarNet Menu Description Range Access ADDRESSING The tekmarNet address of this control. Select between automatic and manual addressing. To manually set the address, use the up or down buttons. Conditions: Available when the 670 is connected to other controls using tekmarNet communication. Auto, b:01 to b:24, 1:01 to 1:24, 2:01 to 2:24, 3:01 to 3:24 Installer DEVICE COUNT Provides a count of all the tekmarNet thermostats, setpoint controls and snow melting controls on a tN4 bus.
Toolbox Menu Description Range Access ERROR CODE The current error code is displayed. Conditions: Always available. See Error Code Section User Installer ACCESS LEVEL Select the access level of the control. This determines which menus and items are available through the user interface. Conditions: Always available.
Override Menu Description Range Access MANUAL OVERRIDE Manually override the normal automatic operation of the control to test the equipment or operate the system at the maximum temperature limits. Auto = Normal operation. Hand = Manual override of each relay output. Max Heat = Operate hydronic system at maximum heat. Test = Operate electric system for 10 minutes. Purge = Hydronic system purge operates pumps to help bleed air from the system. Conditions: Always available.
tekmar Connect Mobile & Web App The WiFi Snow Melting Control can be remotely viewed and adjusted remotely from the tekmar Connect app. • Download the tekmar Connect mobile app from the iTunes® App Store® or from the Google PlayTM Store. • Alternatively go to the tekmarConnect.com website. Before using the WiFi features of this product, you must accept the Terms of Use, as amended from time to time and available at WattsWater.com/Terms-of-Use.
Account Edit your account details: • First and last name • Email address • Phone number your name@domain.com Your Name yourname@domain.com Change the temperature units. 555-555-5555 Logout of the app Account Takes you to the account page. My Devices Locations Change to different locations. Home/Away • Toggles a location between home and away. • Selecting away saves energy by permanently shutting off the snow melt system. • Thermostats operate at energy saving temperatures.
Control Operation • Edit device name • Delete devices Back to My Devices View run time energy usage Provides control status: • System is Off • System is Melting • Storm Predicted • System is Idling • System in Override • Press to start melting • Press to stop melting • Greyed out when off for Warm Weather Shut Down or Cold Weather Cut Out Energy Usage Back to control page Toggle between daily and monthly energy usage views. Number of hours the snow melting system is operating.
Sequence of Operation Snow Melting Overview A snow melting system can offer a safe, convenient, and cost effective way of removing snow and ice from the snow melting slab and similar surfaces. Safety is increased by activating the snow melting system as soon as the snow falls rather than waiting for mechanical snow removal after snow has accumulated. This eliminates slip hazards and reduces the risk of injury by mechanized snow melting equipment, thereby reducing potential liability costs.
Melt – EconoMelt When a Snow/Ice Sensor 090 or 094 is installed, the installer can choose to select to either automatically or manually start the snow melting system. Selecting EconoMelt to On allows snow removal using a snow plow or shovel. The remaining thin layer of snow or ice that mechanical snow removal methods are unable to remove can be melted using the manual start operation. The snow melting system stops when the sensor is dry. The factory default for EconoMelt is Off.
Tandem Snow/Ice Detection The 670 can be paired together with a 654 to allow two Snow/ Ice sensors 090 or 094 or Snow Sensors 095 to be installed for a single zone. This provides full redundancy and increases the snow detection area. Both sensors are used to detect snow or ice and if either sensor is wet the snow melting zone starts melting. The control continues to operate until both sensors are dry. This allows snow or ice detection over a wider area.
Idle Operation When the snow melting system starts from a cold temperature, there may be a long time delay before the slab is warm enough to melt snow. This time delay allows snow to accumulate on the slab which is not acceptable in some commercial and institutional applications. To decrease the start-up time, the slab can be pre-heated to maintain a minimum temperature. This is known as the Idle temperature.
Slab Temperature Control the Status menu displays the actual measured temperature, so it is normal to view slab temperatures that exceed the melt, idle, or storm temperature settings. Slab Outdoor Reset Surface temperature = 35ϒF Core (sensor) is warmer Increasing Slab Core Temperature Controlling the slab temperature is critical to minimizing the cost of snow melting. This requires that either a Snow/Ice Sensor 090 or 094 or a Slab Sensor 072 or 073 is installed.
Hydronic Priority Levels--------------------------------------------------------------------------------Priority = None All zones have the same priority and can operate at the same time. This setting is recommended when the boiler plant capacity is sized larger than the heat loss of all zones at design conditions. MELT OFF Zone 1 MELT OFF Priority = Conditional The zone with the lower priority starts melting when the zone with higher priority is warm enough to melt snow or ice.
Warm Weather Shut Down Manual WWSD The control enters WWSD when the outdoor air temperature exceeds the WWSD setting by 1°F (0.5°C) and when the slab temperature exceeds 34°F (1°C). The control exits WWSD when the outdoor air temperature falls 1°F (0.5°C) below the WWSD setting or if the slab temperature falls below 34°F (1°C). This allows the Melting Setpoint setting to be set higher than the WWSD. This is useful when high slab temperatures are required to melt the snow or ice.
Application Modes The snow melting control can operate either an electric or a hydronic snow melting system. A hydronic system can be categorized as boiler, mixing, boiler and mixing, or pulse width modulation zone operation. A dedicated boiler only provides heat for the snow melting system. A shared boiler provides heat for the snow melting system in addition to the space heating and/or a domestic hot water system.
Boiler Operation EMS---------------------------------------------- When the boiler is required to operate, the control's boiler modulation output is adjusted to an appropriate analog signal corresponding to the boiler target temperature and then turns on the boiler stage 1 relay. The analog signal is proportional to the boiler target in a linear line defined by the EMS Signal Minimum, the EMS Low Temperature, and the EMS High Temperature settings.
Mixing Operation The Application Mode should be set to Mixing when a mixing valve or a mixing injection pump is installed with a shared boiler plant. Four mixing options are available: • Floating action mixing valve • Variable-speed injection pump • Analog mixing using 0-10 V (dc) • Analog mixing using 4-20 mA The control calculates the Slab Target temperature based on the outdoor air temperature and the Melting, Idling or Storm Setpoint.
Troubleshooting It is recommended to complete all wiring to ensure trouble free operation. Should an error occur, simply follow these steps: ! 1. Find: If the control shows the Warning Symbol on the screen, it is indicating a problem on the system. 2. Identify: Press the Warning Symbol to view the error code. 3. Solve: Use the chart below to match the error code to the one on the control. Use the description to solve the problem.
Error Messages (2 of 4) Description MIX SUPPLY SENSOR OPEN CIRCUIT ERROR Due to an open circuit, the control is unable to read the Mix Supply Sensor 082 on terminals 15 and 16. The control stops operation and does not provide any heat. Check the system supply sensor wire for open circuits according to the sensor installation manual. It may be necessary to replace the mix supply sensor. Once the error has been corrected, the error message automatically clears.
Error Messages (3 of 4) Description SNOW SENSOR BROWN WIRE OPEN CIRCUIT ERROR Due to an open circuit, the control is unable to read the brown wire connected to the Snow/Ice Sensor 090 or 094 on terminals 7 and 10. Idling and Storm is disabled and energy saving features such as Warm Weather Shut Down (WWSD) and Cold Weather Cut Off (CWCO) are operated using the outdoor temperature only. Check the snow/ice sensor brown and black wires for open circuits according to the sensor installation manual.
Frequently Asked Questions Symptom Look For... Corrective Action Touchscreen is off Power to control Use electrical meter to measure 115 V (ac) voltage on input power L and N terminals. System pump always on Display shows Idle Idle operation requires that the system pump operate continuously while below the melting temperature setting. Blue short Dirt or salt on snow/ The snow/ice sensor requires regular cleaning. Avoid using road salt on the snow ice sensor melting slab.
Technical Data WiFi Snow Melting Control 670 Boiler & Mixing / Electric Literature Control Packaged weight Dimensions Display Enclosure Approvals Ambient conditions Power supply Relays Boiler modulating output Injection mixing pump Floating mixing output Analog mixing output Manual melt call Communications Mobile app Sensors –Included –Optional 670_A, 670_C, 670_D, 670_J, 670_U Microprocessor control. This is not a safety (limit) control. 4.3 lb.
