Traco SR506-2(4) 6-Zone Circulator Relay with Priority

Original price was: $306.97.Current price is: $267.85.

18 in stock

SKU: 228803 Category:


Overall, the Taco SR506-2(4) offers a compact, expandable, and multi-functional control solution for managing multiple zones and a circulator pump in hydronic heating systems. Its priority function, diagnostic lights, compatibility with various valve types, built-in transformer, and circulator relay make it a versatile choice for efficient and customizable temperature control.


  • Manages water flow to 6 zones in a hydronic heating system, ensuring efficient zone-based temperature control.
  • Activates and deactivates a circulator pump to maintain continuous water circulation when needed, optimizing system performance.
  • Offers a switchable priority function for one zone, allowing it to take precedence over others when activated.

Key Features:

  • 6-zone capacity (expandable): Suitable for small to medium multi-zone systems, with the option to add more zones using expansion modules.
  • Switchable priority: Prioritizes one zone over others when needed, ensuring immediate comfort or addressing critical areas.
  • External diagnostic lights: Facilitate troubleshooting by indicating system status and zone operation.
  • Compact design: Optimizes space utilization in control panels.
  • Compatible with various valve types: Works with 2-, 3-, or 4-wire zone valves for flexibility in system design.
  • Built-in circulator relay: Eliminates the need for a separate relay to control the circulator pump, simplifying wiring and installation.
  • Field-replaceable transformer: Facilitates easy maintenance if needed.
  • Universal thermostat compatibility: Works with a wide range of thermostats.
  • Fuse-protected: Ensures electrical safety.


  • Hydronic heating systems (radiant, baseboard, fan coil)
  • Closed cooling circuits (zoned air conditioning)
  • Hydronic heating and cooling systems (combined heating and cooling zones)

Things to Consider:

  • System compatibility: Verify compatibility with your system’s voltage, control signals, and valve types.
  • Installation complexity: While DIY installation is possible, consulting a qualified professional is recommended for optimal performance and safety.
  • Expansion modules: If you need more than 6 zones, additional SR506-2(4) units will be required.

Additional information

Weight 5.18 lbs


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