Questions 2: Image 11 (updated) for CH valve Brown wire (1) this connects to the black wire (2) this used to the yellow wire from the thermostat. and above it (4) used to be the red from the thermostat.
At this point I would normally test with a multimer to be sure I have the right wires. With the multimeter set to resistance connected to the Red and Yellow wires, get an assistant to turn the thermostat up to max. The resistance measured should be very low. When the thermostat is turned to minimum the resistance is very high. If so, you have the right wires.
What are the grey wires?
Two grey wires would normally be to the motorised valves, and would provide the permanent live for them to control the boiler. But they would be nothing to do with the thermostat wiring.
No.Would i connect the grey wires and brown wire (1) to complete the circuit and therefore the thermostat wires have been taken out of the circuit?
they would be nothing to do with the thermostat wiring.
Would something like this work to provide 12v dc power to a Nest thermostat with the 240v ac supply coming from the wiring centre.Not exactly sure what you mean, but if you mean how would I suggest you get power to it I've used various methods depending on the location of the components and the construction and layout of the property.
If possible my personal preference is always to wire the Heat link to the Thermostat. I have drilled holes in and threaded wires behind plasterboard, on occasion I have run a new wire in the room behind especially if it's a cupboard or a cloakroom [in my hallway at home, there's an understairs cupboard behind where my thermostat is located] and drilled though to the side where the thermostat is to be located. Once I ran some mini trunking at the side of a door frame and put the cable in that. On another occasion I lifted the wallpaper cut a groove with a knife and buried some 12v alarm cable in that and re-stuck the wall paper. I have used the existing thermostat cable and extended the other end from where it used to be connected to the wiring centre to the Heat link. And on a one occasion where it was really tricky, I used a separate Nest supplied 'plug in' power supply.
Not my personal preference, but thin 12v black cable run outside of the house might be a possibility. Between floors it might be able to be hidden behind a drainpipe. However, most homes seem to have a proliferation of TV, internet cables on show outside already, one more may not be an issue.
Hope some of that helps.
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