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- 4 Sep 2023
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Hello, I hope you are well, I’m planning on replacing the current CH/HW controls with a Google Nest.
I’m pretty sure I’ve got it figured out but just wanted to double check with somebody with more experience,
So the current setup is pretty similar to the attached diagram I think the only time its beeen touched since new 1996 is when the boiler was replaced and cylinder stat was.
So from the attached diagram and the nest instructions I think I need to
Remove 2+3 from the wiring centre as these go to the current thermostat which I shall reuse and supply with 12V to put the thermostat in the same place.
Terminal 3 on the nest to terminal 4 on the wiring centre for the call for heat, terminal 4 on the nest to terminal 8 on the wiring centre for the heating N/C, then 6 on the nest to 10 on the wiring centre for the hot water call for heat.
Commons linked out L - 2 - 5
Then just a general tidying up
The systems has a programmer
Drayton LP522 which will be removed
Drayton Thermostat
Cylinder Stat
Circulating pump for the central heating
2 Port mid position valve for hot water
I’m pretty sure I’ve got it figured out but just wanted to double check with somebody with more experience,
So the current setup is pretty similar to the attached diagram I think the only time its beeen touched since new 1996 is when the boiler was replaced and cylinder stat was.
So from the attached diagram and the nest instructions I think I need to
Remove 2+3 from the wiring centre as these go to the current thermostat which I shall reuse and supply with 12V to put the thermostat in the same place.
Terminal 3 on the nest to terminal 4 on the wiring centre for the call for heat, terminal 4 on the nest to terminal 8 on the wiring centre for the heating N/C, then 6 on the nest to 10 on the wiring centre for the hot water call for heat.
Commons linked out L - 2 - 5
Then just a general tidying up
The systems has a programmer
Drayton LP522 which will be removed
Drayton Thermostat
Cylinder Stat
Circulating pump for the central heating
2 Port mid position valve for hot water