654_A Application Brochure 06/13 Snow Melting Control 654 Snow Melting Replaces: New The Snow Melting Control 654 is designed to operate electric or hydronic equipment to melt snow or ice from a driveway, loading dock, sidewalk, patio, helipad or car wash bay. The snow melt surface temperature is controlled using slab outdoor reset to reduce operating energy costs. The 654 provides automatic start and stop when used with the Snow / Ice Sensor 090 or 094.
Single Zone with Boiler A654-1 Mechanical Description A Snow Melting Control 654 operates a hydronic snow melting system using a modulating boiler and a system pump. The boiler is piped in primary-secondary to the snow melt system to allow the system pump to operate continuously during melting or idling while allowing the boiler and boiler pump to turn on and off as required. The boiler firing rate is modulated using a 0-10 V (dc) or 4-20 mA signal.
Single Zone with Boiler A654-1 Electrical Snow / Ice Sensor 090 or 094 Snow Sensor 095 Or Transformer 009 Brn Yel Blu Red Blk Slab Com C tN4 R L N And/Or Brn Yel Blu Red Blk Slab Com C Relay 003 3 4 5 6 + Optional tN4 Communication Snow Sensor 095 Slab Sensor 072 or 073 – T T Modulating Boiler 2 1 8 7 Relay 003 No Power Aux Ht R C tN4 Mod Brn Yel Blu Red Blk Out/ Sup – + Slab Com Bret Supply Sensor 082 2 1 8 7 3 4 5 6 Outdoor Sensor 070 System Pump G N L 115 V (ac) 3 of 16 © 2
Single Zone with Boiler and Tandem Snow / Ice Sensors A654-2 Mechanical Description A single zone includes two Snow / Ice Sensors 090 or 094 for Tandem Snow / Ice Detection for a wider snow or ice detection area and backup should one of the two sensors fail. When snow or ice is detected the snow melting system is automatically started and stops when the slab is dry. Each sensor requires a Snow Melting Control 654.
Single Zone with Boiler and Tandem Snow / Ice Sensors A654-2 Electrical Snow / Ice Sensor 090 or 094 No Power Aux Ht R C tN4 Mod Brn Yel Blu Red Blk Out/ Sup – + Slab Com Bret Transformer 009 C Relay 003 3 4 5 6 + Snow / Ice Sensor 090 or 094 R L N – T T Modulating Boiler 2 1 8 7 Relay 003 No Power Aux Ht R C tN4 Mod Brn Yel Blu Red Blk Out/ Sup – + Slab Com Bret Supply Sensor 082 2 1 8 7 3 4 5 6 Outdoor Sensor 070 System Pump G N L 115 V (ac) 5 of 16 © 2013 654_A - 06/13
Single Zone with Modulating Steam Valve A654-3 Mechanical Description A Snow Melting Control 654 operates a modulating steam valve and a system pump. The heat source may be either district steam or a steam boiler. The slab temperature is controlled by adjusting the steam valve position using an analog 0 to 10 V (dc) or 4 to 20 mA signal. The slab is heated to maintain the slab target temperature.
Single Zone with Modulating Steam Valve A654-3 Electrical Snow / Ice Sensor 090 or 094 Modulating Steam Valve Snow Sensor 095 Or Snow Sensor 095 Slab Sensor 072 or 073 And/Or + – Brn Yel Blu Red Blk Slab Com Optional tN4 Communication Brn Yel Blu Red Blk Slab Com tN4 C C L N R Transformer 009 Relay 003 2 1 8 7 3 4 5 6 No Power Aux Ht R C tN4 Mod Brn Yel Blu Red Blk Out/ Sup – + Slab Com Bret Supply Sensor 082 Outdoor Sensor 070 System Pump G N L 115 V (ac) 7 of 16 © 2013 654_A - 06
Single Zone Mixing with Space Heating & DHW A654-4 Mechanical Description A snow melting system is operated together with a space heating and domestic hot water system. A Snow Melting Control 654 operates the hydronic snow melting system using a mixing injection pump and a system pump. The mixing injection pump is modulated using a 0-10 V (dc) or 4-20 mA signal to maintain the slab at the slab target temperature.
Single Zone Mixing with Space Heating & DHW A654-4 Electrical Snow / Ice Sensor 090 or 094 Snow Sensor 095 Or + – Slab Sensor 072 or 073 And/Or Snow Sensor 095 0-10 V (dc) Mixing Injection Pump Brn Yel Blu Red Blk Slab Com Brn Yel Blu Red Blk Slab Com G N L 115 V (ac) No Power Aux Ht R C tN4 Mod Brn Yel Blu Red Blk Out/ Sup – + Slab Com Bret Supply Sensor 082 316 W House Control 402 Boiler Expansion Bus Zone 1 Expansion End Switch Input Power R C tN4 C tN4 X X R C C tN4 C R Zone 2 W tN4
Multi-Zone with Boiler and Mixing A654-5 Mechanical Description Up to 12 zones of snow melting are heated by a common three-way mixing valve and boiler. Each zone is operated by a Snow Melting Control 654. The mixing valve and boiler are operated by a Universal Reset Module 422 and Zone Manager 336. Snow melt zone priority is available if the boiler is not sized for the combined heating load. Each slab is heated to maintain its slab target temperature.
Multi-Zone with Boiler and Mixing Snow / Ice Sensor 090 or 094 A654-5 Electrical Snow Sensor 095 Or Brn Yel Blu Red Blk Slab Com Snow / Ice Sensor 090 or 094 Slab Sensor 072 or 073 And/Or Snow Sensor 095 Snow Sensor 095 Or Brn Yel Blu Red Blk Slab Com Brn Yel Blu Red Blk Slab Com Slab Sensor 072 or 073 And/Or Snow Sensor 095 Brn Yel Blu Red Blk Slab Com Zone 1 Zone 2 No Power Aux Ht R C tN4 Mod Brn Yel Blu Red Blk Out/ Sup – + Slab Com Bret Supply Sensor 082 No Power Aux Ht R C tN4 Mod B
Multi-Zone Car Wash A654-6 Mechanical Description A car wash can have up to 12 bays and aprons each having an ice melting system operated by a Snow Melting Control 654. A boiler or water heater heats a storage tank which is used for hot water to wash vehicles and heat the ice melting system. The control uses a Slab Sensor 072 or 073 to measure the slab temperature and operates the zone to ensure the slab is above freezing.
Multi-Zone Car Wash A654-6 Electrical Zone 1 Slab Sensor 072 or 073 No Power Aux Ht R C tN4 Mod Brn Yel Blu Red Blk Out/ Sup – + Slab Com Bret Supply Outdoor Sensor Sensor 082 070 Zone 2 tN4 W Zone 1 Expansion End Switch Input Power R C tN4 C tN4 X X R C R C C R Zone 2 W tN4 C R Zone 3 Zone 1 Power Zone 2 End Switch W tN4 C R Zone 4 W H8002A Slab Sensor 072 or 073 No Power Aux Ht R C tN4 Mod Brn Yel Blu Red Blk Out/ Sup – + Slab Com Bret Zone 3 Zone 4 tN4 Wiring Center 316 Four Zone P
Multi-Zone Electric A654-7 Mechanical Description An electric snow melting system has up to 12 zones. Zone 1 has priority over zones 2 through 12. Each Snow Melting Control 654 is connected to a 230 V (ac) electrical contactor which in turn energizes the electric cables. Whenever the zone 1 electrical contactor is shut off, zone 2 is able to operate. Each slab is heated to maintain its slab target temperature.
Multi-Zone Electric A654-7 Electrical Snow / Ice Sensor 090 or 094 Zone 1 Snow Sensor 095 Or Brn Yel Blu Red Blk Slab Com Brn Yel Blu Red Blk Slab Com Outdoor Sensor 070 Optional Alert Equipment Snow / Ice Sensor 090 or 094 Zone 2 Snow Sensor 095 Or Brn Yel Blu Red Blk Slab Com Slab Sensor 072 or 073 And/Or Snow Sensor 095 Brn Yel Blu Red Blk Slab Com No Power Aux Ht R C tN4 Mod Brn Yel Blu Red Blk Out/ Sup – + Slab Com Bret 24V C W Electric Relay Contactor And/Or Snow Sensor 095 No
tekmar Control Systems Ltd., A Watts Water Technologies Company. Head Office: 5100 Silver Star Road, Vernon, B.C. Canada V1B 3K4, 250-545-7749, Fax. 250-545-0650 Web Site: www.tekmarControls.com Product design, software and literature are Copyright ©2013 by tekmar Control Systems Ltd., A Watts Water Technologies Company 16 of 16 All specifications are subject to change without notice. Printed in Canada. 654_A - 06/13.
