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I am installing new zone valves onto this boiler. First I have tben cut and solder the zone valves. Next I need to wire the zone valves. I need a 24 power and common wire. The power these wires provide drive open the zone valve motor. Finally the end switch needs to be wired. The end switch is a dry set of contacts. When the zone valve opens, end switch closes completing the electric circuit. Once this circuit closes the boiler turns on.