Ok, pretty basic question hete.....Currently my zone / flow valve runs on 220 v wired straight from the compressor relay. ( Well that's what I call it) being proactive, I know this flow valve wont last forever, but I cant seem to find a replacement as a backup. I only see 24v valves. So, the question is where do I pick up the 24 volts from ? I would assume it would be from where the thermostats wires attach. But would I use the C wire ? As it would be hot when the thermostat is calling for heat or cool.