Nest thermostat high voltage hack installation high voltage conversion i am a licensed electrician that specializes in commercial building automation lighting controls fire alarm and security systems.
Nest high voltage conversion.
I have a millivolt system and i connected it to the nest with a 24vdc source like you mentioned.
Done the relay is assuming you have a high voltage system but the name millivolt is self explanatory there is no high voltage.
High voltage thermostats are usually labeled 110 115 120 or 240 vac note.
A typical low voltage thermostat with multiple small wires in different colors.
It is possible to convert to a low voltage system if you have a high voltage system but it s pretty involved and takes a bit of know how so.
High voltage thermostats are often built into the wall and typically have two to four thick wires coming out of the thermostat.
A typical high voltage thermostat with 2 4 black and red wires.
I m installing a nest gen 2 thermostat in my eichler and am using a honeywell relay ra89a to convert from high voltage to low voltage.
It learns your habits and is controllable using smartphone applications when situations arise and you need to change the settings.
I don t see the need for the relay.
You ve probably heard the term low voltage or 24v while researching smart thermostats but if you re early in your research you might not yet know the difference the difference is critical.
The 2018 nest learning thermostat 3rd generation is not only compatible with high voltage systems but it works as your best friend who is an agoraphobe and never leaves the house.
Wire nuts are often used to connect the thermostat to the system wires.
In some cases it is possible to make a high voltage system nest.
I enjoy my work and these type of gadgets intrigue me.
Today s best known smart thermostats from manufacturers like ecobee nest and honeywell are desig.
On 2019 04 26 by mod convert a honeywell t6373a1108 thermostat on a high voltage circuit to use a nest thermostat anon it is indeed possible to convert a line voltage thermostat controlled heater to use a low voltage room thermostat.