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PostPosted: Fri Dec 08, 2017 10:30 pm 
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I have just received a nest thermostat and would like little confirmation before i install that i'm correct. as first time installing something like this.

I have currently Honey well St9100 and honey well NC60G wireless thermostat

At the moment it is wired as picture below I did a Continuity test on the wire and looks like have system is 230v diagram of wiring below and confirmed

http://www.ultimatehandyman.co.uk/forum1/download/file.php?mode=view&id=47191&sid=a7151264c74f3e547ac2a41686de2a00

here is the timer and receiver as wired above
http://www.ultimatehandyman.co.uk/forum1/download/file.php?mode=view&id=47193&sid=a7151264c74f3e547ac2a41686de2a00
http://www.ultimatehandyman.co.uk/forum1/download/file.php?mode=view&id=47194&sid=a7151264c74f3e547ac2a41686de2a00

the inside of the boiler ECB
http://www.ultimatehandyman.co.uk/forum1/download/file.php?mode=view&id=47192&sid=a7151264c74f3e547ac2a41686de2a00

Looking at the diagram in the nest manual i should wire up the nest Heat link as page 22

Am i correct in this?

Also very worryingly when i tested the earth from boiler to ST9100 i did not receive and buzz on continuity test. On farther investigation i found the the previous installer has not joined the ear from the 3A fused switch. should i join these as it looks like boiler is not earth.

Thanks for help


Attachments:
File comment: nest instructions
IMG_2122.jpg
IMG_2122.jpg [ 139.85 KiB | Viewed 333 times ]
File comment: wireless receiver
IMG_3044.jpeg
IMG_3044.jpeg [ 165.95 KiB | Viewed 333 times ]
File comment: timer
IMG_5240.jpeg
IMG_5240.jpeg [ 178.57 KiB | Viewed 333 times ]
File comment: 230v side of boiler as far as i can tell
IMG_0085.jpeg
IMG_0085.jpeg [ 204.45 KiB | Viewed 333 times ]
File comment: current wiring
IMG_9741.jpg
IMG_9741.jpg [ 107.72 KiB | Viewed 333 times ]
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