Taco SR501-2/SR501-4 Switching Relay for Boilers, Single Zone
Taco SR501-2 and SR501-4 Enhanced Switching Relay
Advanced features allow for complete customization of your system. It is the best choice for all your zoning applications.
This switching relay has advanced timer and boiler functions, clear diagnostic lights, a contractor-friendly PC board layout, and switchable priority. Go with the time-proven reliability Taco's circulators and thermostats. You'll also get built-in priority protection, premium-quality sealed relays, fuse protection, isolated end switch, universal thermostat compatibility, all in a compact design.
External LED Indicator Lights
Connect wires from a thermostat signal to the "T T" terminals on the switching relay. When the thermostat signals for heat, then the relay curcuit will open and and power goes to the circulator.
Power Input: Connect 120VAC 60 Hz power to terminals N and H. The thermostat connection has an output of 24 VAC class 2
Maximum Combined Load: 12 Amps
Compatible Switching Relay Cross Reference. Use the Taco SR501 to replace these models:
Argo AR821 AR822