SR502-4 Taco 2 Zone Switching Relay For Pumps (Not For Use With Zone Valves)

Taco SR502-4 2 Zone Switching Relay For Pumps (Not For Use With Zone Valves) Features - 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 - UL Approved - Extended 3 Year Warranty - Made in the USA - 2 Zones with priority - 120 VAC transformer voltage - 15 Amps max total load - 10-1/4" Width - 2-3/4" Depth - 6.75" Height This item replaces: SR502-2, SR502 Switching Relays 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. Taco Expandable Switching Relays Whether you want to expand up to 120 zones or utilize the advanced features of the Add-on Power Controls, Taco -EXP controls allow for simple integration of advanced features. Built-in Post Purge and Pump Exercise functions can optimize the operation of any system. The Taco Switching Relay is the best choice for all your zoning needs, with advanced timer and boiler functions, 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 integration is achieved.