How to connect Nest Heat Link to Honeywell ST9400C1000 programmer
Ok , so you have the heat link and the nest thermostat?
Yes, 4 cables connected to heat link, neutral, live and 2 others
Ok . they will be 240 volt from the programmer and back to switch the boiler on . there should be two connections( t1 and t2 that goes to the nest thermostat. These at 12 volt
Does that make sense to you?
yep, ive connected other 2 to port 2 and 3
Ok , so the programmer, heating on routes through the room stat , to the motorised valve and on to the boiler
can you check the pic?
I think all you need to do now is connect t1 and t2 to the nest
you see i dont want to use old thermostat placement
That's ok .was a lead supplied to connectvtge heat link to the nest?
before i have use it in the previous house and different boiler so i have attached lead.
in the new house i have differrent boiler
so i know where to connect live cable and neutral. but im not sure what about the rest
Ok , but you have managed to wire up the heat link apart from the he room stat
Out of programmer 4 to 2 of heat link.out of 3 of heat link into motorised valve .any probs , give me a call