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Explain how Wirsbo actuator works
I have 14 4-wire Wirsbo motorized valve actuators in my radiant heating system. In troubleshooting the wiring and getting ready to expand to more thermostats, I thought it would be a good idea to try to understand how the control works.
1) Both yellow wires carry 24v. I thought a motor would need a ground to work.
2) Aren't the two red wires limit switches that close a ground circuit mechanically when the valve is open to tell the controller to stop supplying voltage to the MVA?