Taco Zone Circulator Pump Switch Wiring Diagram. A typical switching relay such as the taco sr502 506 can swit3ch 4 zone valves or more. In the diagram the system pump hot goes through the end switch xx terminals on the lower left side of the board.
Get a taco zvc403 zone control panel and follow the instructions. See wiring diagram above. The second x gets wired to the system pump hot.
Tt on boiler thermostat to.
Connect linehot power to the black lead neutral to the white lead. Wiring the circulatordisconnect the ac power supply. The second x gets wired to the system pump hot. Connect hot input lead of the circulator to the left side of the pump end switch terminal on board.