Taco SR504-EXP-4 Switching Relay, 4 Zone, Expandable

Product Description We've enhanced our complete line of Zone Valve Controls with the features and styling you've been asking for. Whether you're looking for switching relays, zone valve controls, priority zoning circulators, or fan controls, Taco has everything you need. Together with Taco Zone Valve Controls, thermostats, the “00” family of circulators, and a host of add-on controls, we offer the highest quality and broadest selection of zoning products. From the Manufacturer Taco Switching Relays combine clearly-labeled PC board layouts with advanced features that allow you to completely customize your system. And whether you're using basic priority switching, Taco Plug-In PowerPort Cards or add-on power controls, tailoring the system has never been easier. External indicator lights give you instant diagnostic feedback, making service calls or new installation start-ups a snap. All switching relays are UL listed, use standard "ice cube" replaceable relays and are compatible with conventional and programmable thermostats. For larger jobs, switching relays can be expanded up to 20 zones with priority. With the exclusive Taco PowerPort Plug-In Cards, you can easily add such features as post purge, priority protection and pump exercise. Any expandable switching relay can also interface with the Boiler Reset Control and Injection Mixing Add-On Power Controls. Mix-and-match as needed to customize the system.

• Front diagnostic lights
• Switchable priority
• Built-in priority protection
• Simplifies wiring
• 100% factory tested