6 Zone Next Generation Switching Relay, Expandable

The Taco SR506-5 Switching Relay is the best choice for all your zoning needs, with advanced PowerPort Cards, external diagnostic lights, switchable priority and contractor friendly PC board layouts. Combined with the time proven reliability of the 00 family of circulators and thermostats, total system integrating is achieved. External indicator lights provide instant diagnostic feedback, making a snap of service calls or new installation start-ups. * Built-in; Post Purge and Pump Exercise Functions * Switchable Primary Circulator Output * Two Boiler Contacts, Utilizes Full Functionality of * Mod-Con Boilers * Expandable to 20 Zoning Panels (120 zones if all are six zone panels) * Taco Control Mobile App (not Required for all functions) * Wireless Update Capabilities * Four 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