SR504-EXP

Taco Zone Controls are contractor-friendly and loaded with advanced features, so you get the complete hydronic system control you want, quickly and easily. Taco has whatever you’re looking for—Switching Relays, Zone Valve Controls, Priority Zoning Circulators and Fan Controls. Together with Taco Zone Valves, Thermostats, the “00” family of circulators and a host of add-on controls, Taco offers the highest quality and most comprehensive selection of zoning products you’ll find anywhere. 

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. 

Features include:
External Indicator Lights
Switchable Priority
Simplified Wiring
Fully Enclosed Snap-Out Relays
Compact Design
Fuse Protected
100% Factory Tested
Isolated End Switch
Contractor Friendly PC Board Layout
Universal Thermostat Compatibility
UL and CSA Approved
24 Volt Power Input or Output Terminal
Extended 3 Year Warranty
Made in the USA 

Additional -EXP Features:
Add-on Power Control Plug
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 6 zone panels)
Interface with -EXP Zone Valve Controls