Taco® Switching Relays bring confidence to every job—built with advanced technology and the reliable performance professionals trust. Designed for fast, flexible installation and long-term reliability, they feature Bluetooth® app-based setup, advanced diagnostics, and smart thermostat compatibility. Taco Switching Relays help contractors work smarter and homeowners enjoy greater comfort and energy efficiency—all from the most trusted name in hydronic system control.

• Front Diagnostic Lights
• Switchable Priority
• Built-in Priority Protection
• Simplified Wiring
• Premium Sealed Relays
• Compact Design
• Fuse Protected
• 100% Factory Tested
• Isolated End Switch
• Contractor-Friendly PC Board Layout
• Universal Thermostat Compatibility
• 24 Volt Power Output for hard-wired thermostats
• Field Replaceable Transformer
• Extended 3-Year Warranty

Next Generation New Features

• Built-in Post Purge and Pump Exercise Functions
• Switchable Primary Circulator Output
• Two boiler contacts utilize the full functionality of Mod-Con boilers
• Expandable to 20 Zoning Panels (120 zones if all are 6 zone panels)
• Mobile app (not required for all functions)
• Wireless update capabilities
• 4 programmable outputs
• DHW recirculation SmartPlus logic
• Diagnostic lights for all outputs
• Additional space for wiring
• More space to write zone information
• Easy to remove hinged cover
• Rear knockouts
• Standard control upgradeable to reset model
• Modbus communication

Additional Reset Model Features

• Indoor Reset Control (load reset)
• Outdoor Reset Control (weather compensation)

Applications

• Hot Water Heating Systems
• Closed Cooling Circuits
• Air Conditioning Systems
• Hydronic Heating and Cooling
• Water/Glycol concentrations up to 50%
• Solar / Geothermal

Performance Data

• Advanced timer and boiler functions
• External diagnostic lights
• Switchable priority and contractor-friendly PC board layouts