2-Zone Switching Relay w/ Priority
Brand: Taco
Part#: SR502-4
In Stock
Usually ships: within 1 business days
Taco SR502 Switching Relay combines clearly labeled PC board layout with advanced features that allow for total system customization. External indicator lights provide instant diagnostic feedback, making a snap of service calls or new installation start-ups. Taco SR502 switching relays are UL and CSA listed, use standard “ice cube” replaceable relays and are compatible with conventional and programmable thermostats.

  • 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
  • Made in the USA
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Technical Specifications:
  • Zones: 2
  • Power: 120VAC
  • Max combined load: 15.0 AMPs
  • Dimensions: 10.25" wide x 6.75" high x 2.75" deep.
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Extended 3 Year Warranty
Ask a Question
Is it possible to control a zone valve from a switching relay?
Helpful? Yes No
Taco SR switching relays are for circulators only. If you need to control zone valves, use Taco ZVC (Zone Valve Controls).
By PexUniverse Customer Service on 12/10/2013
I have 4 zones of baseboard heat in my home. I installed a fifth zone which is radiant heat with its on pump, zone valve and mixing valve. I purchased a tacosr502 switching relay so that the pump can run for the radiant side when thermostat call for heat. My question is do I leave all the the existing thermostat wires connected to the TT ?
Helpful? Yes No
If radiant heating zone requires a separate temperature control, then a separate thermostat has to be installed and wired to the Taco SR502 panel.
By PexUniverse Customer Service on 09/04/2012

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