Installing Nest 3

[Deepu Thomas]

Can anyone advise on the right way to replace the danfoss tp9000 thermostat and ts2 sensor with the nest. I have attached pictures showing the current setup.

Thanks in advance,

 

[Jamchiv01]

Live, Neutral and earth from the old programmer go to Live and neutral on the heat link. Terminate the earth in terminal block if no earth terminal is available.

Terminal 3 from the old programmer goes to terminal 6 on the heat link (Hot Water Call)
Terminal 4 from the old programmer goes to terminal 3 on the heat link (Heating Call)

To my knowledge, the nest doesn't use the ts2 sensor but if I'm incorrect, someone will let us know

 

[davesparks]

neutral and earth go in the neutral and Earth terminals.
Live goes to the live and both relay commons (2 and 5)
The switched lives go to their respective N/O relay terminals (3 for CH and 6 for DHW)
The two wires from the thermostat (unless connecting wirelessly) go to T1 and T2 and are not polarity sensitive.

Then you carry out the usual electrical tests before turning it back on.