Nest Thermostat 3rd Gen Install

I had to figure out how to connect a Johnson & Starley J50 to the 3rd Generation Nest Thermostat. I hope that this helps others with similar challenges.

3 thoughts on “Nest Thermostat 3rd Gen Install

  1. Great video! I share your feelings. The instructions are indeed a bit confusing. I have a combi boiler with a wire coming out of it which connects to my existing thermostat. The wire has red, blue and yellow cable. Do you know if this can fit straight into the heat link or do I need to connect more wires up to my boiler?

  2. good video! i also have a similar johnson and starley j32. i would also like to install a nest. but what i dont understand that both these systems are 'modair'. the thermostat doesnt work like a on/off like a boiler. but tells the system via a voltage change the temperature difference (so it knows how hard to work). so i guess my question is, you still must have your old thermostat in place or it must run flat out when its on ?

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