Honeywell st699 programmer wiring diagram - Is a internet site for owners and constructing and renovation professionals. It is not affiliated with any of the manufacturers or carrier carriers mentioned right here. All emblems and exchange names are the belongings in their respective proprietors. For maximum united kingdom installations you’re likely to have a junction field, though i beat the wiring doesn’t look as neat as this diagram. ? this is a “y plan” machine wherein a 3 position valve controls whether or not the heating, warm water or each has a drift of hot water from the boiler. There are tabs on pinnacle of the controller you may depress and pull the controller off the subbase mount. See photograph underneath. Aslo in case you need to you can type st699 honeywell united kingdom /pdf on your browser and get a pdf. Guide at the controller.
As soon as i knew what wires have been what, what i did turned into to update the room thermostat with a hyperlink (among points four and 5 within the diagram above) to minimise the quantity of wiring i genuinely touched (and to make it easy to revert if wanted). ?then i took the prevailing wiring to the thermostat and connected it to the 12v feeds from the nest heat hyperlink. There are tabs on pinnacle of the controller you may depress and pull the controller off the subbase mount. See photo under. Aslo if you want to you can kind st699 honeywell uk /pdf in your browser and get a pdf. Manual on the controller. To perceive these, i essentially had someone to twiddle the ‘stat up and down at the same time as i held a multimeter throughout the terminals i suspected, and when it jumped from open to 0 resistance and lower back i new i had the proper connections.
Once that is finished, the following step is to perceive the wires from the junction box going to the room thermostat. ? confusingly in my system these are unique colorations in the junction field to those inside the thermostat housing, so theres glaringly a link someplace alongside the way.