WiFi Snow Melting Control 671
Application Brochure
Date: 08/19 | Replaces: New
Introduction
The tekmar WiFi Snow Melting Control 671 operates hydronic and electric heating equipment designed to melt snow and/or ice from roads and walkways surfaces. The control works with 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.
The control features a display showing time left, outdoor temperature, and system status (e.g., "System is Melting", "Warming Up"). It includes buttons for Settings, Stop, and Status.
Certifications: FCC ID: Z64-CC3100M0DR1, IC: 4511-CC3100M0DR1, UL Listed.
⚠️ WARNING: Disconnect all power before opening.
⚠️ ATTENTION: Coupez l'alimentation avant l'ouverture.
⚠️ ADVERTENCIA: Desconecte la electricidad antes de abrir.
Signal wiring must be rated at least 300 V.
System Applications
The WiFi Snow Melting Control 671 supports various system configurations:
Dedicated Boiler (A671-1)
This configuration uses the 671 to operate a boiler dedicated solely to the snow melting system. The system is piped in a primary-secondary loop with glycol to prevent freezing. The system pump runs continuously during heating, while the boiler pump cycles with the boiler. Slab temperature is controlled by cycling the boiler.
| Sensor | Sensor Model(s) | Auto Start/Auto Stop | Auto Start/Timed Stop | Manual Start/Timed Stop | Slab Temperature Control |
|---|---|---|---|---|---|
| S1 | Automatic Snow/Ice Sensor 090 or 094 | • | • | • | |
| S2 | Aerial Snow Sensor 095 | • | • | • | |
| S3 | Slab Sensor 072 or 073 | • | • | • | |
| S2+S3 | Aerial Snow Sensor 095 and Slab Sensor 072/073 | • | • | • |
Legend: B1 = Boiler, P1 = System Pump, P2 = Boiler Pump, S1 = Snow/Ice Sensor 090 or 094, S2 = Snow Sensor 095, S3 = Slab Sensor 072 or 073, S4 = Outdoor Sensor 070.
Diagram illustrates the WiFi Snow Melting Control 671 connected to a dedicated boiler (B1), system pump (P1), and boiler pump (P2). An outdoor sensor (S4) is shown. Snow/Ice Sensor Options are depicted for S1, S2, and S3.
On/Off Steam Valve (A671-3)
This application uses the 671 to operate a steam valve and a steam-to-water heat exchanger for a glycol-filled snow melting system. The system pump runs continuously, and slab temperature is controlled by the steam valve. The boiler relay closes when the steam valve is open, signaling the steam boiler to fire.
| Sensor | Sensor Model(s) | Auto Start/Auto Stop | Auto Start/Timed Stop | Manual Start/Timed Stop | Slab Temperature Control |
|---|---|---|---|---|---|
| S1 | Automatic Snow/Ice Sensor 090 or 094 | • | • | • | |
| S2 | Aerial Snow Sensor 095 | • | • | • | |
| S3 | Slab Sensor 072 or 073 | • | • | • | |
| S2+S3 | Aerial Snow Sensor 095 and Slab Sensor 072/073 | • | • | • |
Legend: B1 = Boiler Enable, HX = Steam-to-Glycol Heat Exchanger, M1 = On/Off Steam Valve, P1 = System Pump, S1 = Snow/Ice Sensor 090 or 094, S2 = Snow Sensor 095, S3 = Slab Sensor 072 or 073, S4 = Outdoor Sensor 070.
Diagram illustrates the WiFi Snow Melting Control 671 controlling an on/off steam valve (M1) via a steam-to-glycol heat exchanger (HX) and system pump (P1). Boiler enable (B1) and outdoor sensor (S4) are shown. Snow/Ice Sensor Options are depicted for S1, S2, and S3.
Electric Cable (A671-4)
This application uses the 671 to operate an electric cable snow melting system. The electric contactor is cycled on and off based on the slab load.
| Sensor | Sensor Model(s) | Auto Start/Auto Stop | Auto Start/Timed Stop | Manual Start/Timed Stop | Slab Temperature Control |
|---|---|---|---|---|---|
| S1 | Automatic Snow/Ice Sensor 090 or 094 | • | • | • | |
| S2 | Aerial Snow Sensor 095 | • | • | • | |
| S3 | Slab Sensor 072 or 073 | • | • | • | |
| S2+S3 | Aerial Snow Sensor 095 and Slab Sensor 072/073 | • | • | • |
Legend: E1 = 115 or 230 V (ac) Electric Power Supply, H1 = Electric Heating Cable, R1 = Electric Relay Contactor, S1 = Snow/Ice Sensor 090 or 094, S2 = Snow Sensor 095, S3 = Slab Sensor 072 or 073, S4 = Outdoor Sensor 070.
Diagram shows the WiFi Snow Melting Control 671 connected to an electric relay contactor (R1) which controls an electric heating cable (H1). Power supply (E1) and outdoor sensor (S4) are depicted. Snow/Ice Sensor Options are depicted for S1, S2, and S3.
Two Zones with Common Mixing (A671-5, A671-6)
This advanced system manages two snow melting zones, each heated by its own boiler, with water temperature regulated by a shared mixing valve. The boilers and mixing valve are controlled by additional modules: Universal Reset Module 423, Power Manager 346, and Mixing Expansion Module 444. Each zone is operated by a WiFi Snow Melting Control 671. The slab target is based on setpoints and outdoor temperature. Zone pumps cycle as needed. The 671 communicates with other modules to operate the mixing valve and boilers, and the 423/444 modules manage boiler return protection.
| Sensor | Sensor Model(s) | Auto Start/Auto Stop | Auto Start/Timed Stop | Manual Start/Timed Stop | Slab Temperature Control |
|---|---|---|---|---|---|
| S1a | Zone 1 Automatic Snow/Ice Sensor 090 or 094 | • | • | • | |
| S1b | Zone 2 Automatic Snow/Ice Sensor 090 or 094 | • | • | • | |
| S2a | Zone 1 Aerial Snow Sensor 095 | • | • | • | |
| S2b | Zone 2 Aerial Snow Sensor 095 | • | • | • | |
| S3a | Zone 1 Slab Sensor 072 or 073 | • | • | • | |
| S3b | Zone 2 Slab Sensor 072 or 073 | • | • | • | |
| S2+S3 (per zone) | Aerial Snow Sensor 095 and Slab Sensor 072/073 | • | • | • |
Application Settings:
| Setting Name | Value |
| Boiler Type | Control |
| Outdoor Sensor | tekmarNet |
Legend: B1, B2 = Modulating Boilers, M1 = Actuator Motor 741, P1 = Zone 1 Pump, P2 = Zone 2 Pump, S1a/S1b = Zone Snow/Ice Sensors, S2a/S2b = Zone Snow Sensors, S3a/S3b = Zone Slab Sensors, S4 = Outdoor Sensor, S5 = 423 Boiler Supply Sensor 082, S6 = 444 Mix Supply Sensor 082, V1 = 3-Way Mixing Valve 710 through 714, X1 = Transformer 009.
Diagram illustrates two WiFi Snow Melting Control 671 units, each managing a zone. These units communicate with a Universal Reset Module 423, Power Manager 346, and Mixing Expansion Module 444. The system includes two boilers (B1, B2), two zone pumps (P1, P2), a 3-way mixing valve (V1) with actuator (M1), and various sensors (S4, S5, S6, S1a, S1b, S2a, S2b, S3a, S3b).
Specifications
The following are the recommended specifications for the WiFi Snow Melting Control 671:
- The control shall have the ability to use a snow/ice sensor to automatically detect snow or ice and begin system operation. The system shall continue to run until the sensor is dry or the control is manually stopped.
- The control shall have the ability to be manually started with an adjustable running time that counts down and automatically stops the system.
- The control shall not operate the system to provide heat to the snow melting zones when it enters into either a Warm Weather Shut Down (WWSD) or a Cold Weather Cut Off (CWCO) mode.
- The system water temperature shall be based on the outdoor temperature and feedback from sensors located in the snow melting slabs.
- The control shall have two separate access levels to limit the number of adjustments available to various users.
- The control shall have a manual override that allows each output to be manually turned on or off.
- The control shall continuously monitor its temperature sensors and provide an error message upon a control or sensor failure.
- The control shall record and display boiler and pump running hours and minimum and maximum temperatures depending on the access level that has been selected.
- During extended periods of inactivity, the pumps operated by the control shall be periodically exercised to prevent seizure during long idle periods.
