Premium Honeywell St699 Wiring Diagram Hvac Wiring Diagrams Download Best Of Honeywell St699 Wiring - For most uk installations you’re probably to have a junction box, though i beat the wiring doesn’t look as neat as this diagram. ? that is a “y plan” machine in which a three function valve controls whether the heating, hot water or each has a drift of hot water from the boiler.
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Once i knew what wires were what, what i did became to replace the room thermostat with a link (between factors 4 and five inside the diagram above) to minimise the amount of wiring i actually touched (and to make it simple 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.
As soon as this is performed, the following step is to pick out the wires from the junction box going to the room thermostat. ? confusingly in my machine those are exceptional colorations inside the junction container to those in the thermostat housing, so theres manifestly a hyperlink someplace along the manner.
To discover these, i basically had someone to twiddle the ‘stat up and down while i held a multimeter throughout the terminals i suspected, and while it jumped from open to 0 resistance and back i new i had the proper connections.