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Y Plan Wiring Diagram Schematic
On programming power starts from 3 terminals. Go to the cylinder thermostat first through the central cable. If it requires heat, then the power flow continuously towards the center wire, To the bolier and pump. The valve is not lit at all, and the spring holds it, so water from the boiler only flows into the hot water cylinder. Note that although the orange valve cord is plugged in, it does nothing, because orange only connects through the internal switch when the valve.
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