Complete nest y plan wiring diagram - For most united kingdom installations you’re probable to have a junction box, even though i beat the wiring doesn’t look as neat as this diagram. ? that is a “y plan” machine where a three function valve controls whether or not the heating, hot water or both has a waft of hot water from the boiler. Once that is finished, the subsequent step is to identify the wires from the junction box going to the room thermostat. ? confusingly in my device those are different colours inside the junction container to the ones inside the thermostat housing, so theres manifestly a hyperlink someplace along the way. As soon as i knew what wires have been what, what i did was to replace the room thermostat with a link (between factors 4 and 5 in the diagram above) to minimise the amount of wiring i surely touched (and to make it easy to revert if wanted). ?then i took the present wiring to the thermostat and connected it to the 12v feeds from the nest warmth link.
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To pick out these, i basically had a person to twiddle the ‘stat up and down whilst i held a multimeter across the terminals i suspected, and when it jumped from open to 0 resistance and again i new i had the right connections.