I am having a two-wire system oil boiler with two-zone valves. I installed two Nest E and worked fine but it started to swing the valves due to the charging cycle. So I decided to run a new C wire from the C terminal of the transformer.
Here comes the problem. After I tracing the wires, looks like the wirings from the transformer are reversed. I drew the lines in the actual color of the wire.
So if I reversely connect (R W) wires to Nest E and connect new C wire from the C terminal of the transformer as below, all is well?
Or should I reconnect all zone valves too? I'd appreciate it if anyone can suggest a good solution for this.