Select Page

Enhanced Switching Relays

Taco’s Enhanced Switching Relays are 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. The Enhanced Switching Relays additional features include built-in priority protection, premium sealed relays, compact design, fuse protected, isolated end switch and universal thermostat compatibility.
Catalog
Instruction Sheet
Wiring Guides
Find your Taco Sales Representative
Click below to get in touch with your local Taco supplier:
Find a Rep
We’re Here to Help
Support is only a click away! Our dedicated customer service and tech support teams are waiting to hear from you.
Support
Performance Data

Advanced timer and boiler functions
External diagnostic lights
Switchable priority and contractor-friendly PC board layouts

Features
  • Front Diagnostic Lights
  • Simplified Wiring
  • Switchable Priority (Switching Relay)
  • Built-in Priority Protection (Switching Relay)
  • Premium Sealed Relays
  • Compact Design
  • Fuse Protected (with spare)
  • 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

Additional EXP Features – Single Zone Switching Relay

  • One Add-on Power Control Plug
  • Input to override Outdoor Boiler Reset if Using PC700, When DHW Calls for Heat
  • Interface with all -EXP Multi-Zone Controls

Additional EXP Features – Switching Relay

  • 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
Applications
  • Hot Water Heating Systems
  • Closed Cooling Circuits
  • Air Conditioning Systems
  • Hydronic Heating & Cooling
  • Water/Glycol concentrations up to 50%
  • Solar / Geothermal
Models & Related Documents

Single Zone Switching Relay

SR501

SR501-HC

Switching Relay

SR502

SR503

SR504

SR506

Expandable Switching Relays

SR501-EXP

SR503-EXP

SR504-EXP

SR506-EXP 

Pin It on Pinterest