I was actually trying to understand the mapping of these wiring to my diy R-Pi. So I connected all the zone wires to the relay ports (3rd port on each relay module). From the pic on the post above, you can clearly see that 2 white wires going to one of the 24V ports and a red+white wire goes to the other 24V port. I took the 2 white wire and plugged in on the middle port of a relay module, wired the red+white to the C wire. Tried to fire off that port but didn’t work. How do I wire the power onto the relay module?