As I said in the last post having both zone valves & circ pumps for each zone added some complexity to the controls… I was glad I figured it out in advance and did a single line drawing of it as not to forget while I was dealing with the mess of wires. The two large boxes on the left are for our wireless thermostats and the box on the right are the pump controls.
(For those who want the boring explanation of how it works … There is a new power supply that runs to the thermostats, which in turn activates the zone valves if they call for heat closing their contact. The zone valves charge an electronic actuator to open the ball valve and also closes an end switch. The end switch activates the pump control with in turn starts the pump and the boiler…)
We are ready for next winter with our new diaphragm expansion tank, air separator, automatic fill valve, and efficient zone valves!