Taco Comfort Solutions 3-Zone Expandable Switching Relay with Priority

Taco Switching Relays combine clearly labeled PC board layouts with advanced features that allow for total system customization. Whether using basic priority switching or the advanced features of the -EXP controls, the job is made easy. External indicator lights provide instant diagnostic feedback, making a snap of service calls or new installation start-ups. All switching relays are UL Listed, are compatible with conventional and programmable thermostats.|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|Add-on power control plug|Built-in, post purge and pump exercise functions|Switchable primary circulator output|2-boiler contacts, utilizes full functionality of mod-con boilers|Expandable to 20-zoning panels (120-zones if all are 6-zone panels)