Hi everyone,
I just installed Google Nest Thermostat 3 Gen, made for Europe together with Uponor C35 underfloor heating system (my version of the Nest comes with a heat link, which is a separate device installed near my underfloor control system. The thermostat talks to Heat Link via wireless or wire (in my case it's a wired connection, which gives power to the thermostat as well)).
A small explanation is needed: I have 3 floor zones to heat with the underfloor heating system. I replaced a thermostat of one of the zones by the Nest thermo, the rest 2 zones are still controlled by the native Uponor thermostats. The source of heating liquid is central district heating station, so in house, we just control the valves that let the heating liquid flow into zones
I wired the Heatlink in place of a regular thermostat. So, from the point of view of my underfloor heating system (which is Uponor C35) - the Heat Link is placed instead of its regular thermostat.
I connected the wires to the 1 and 2 connectors on the Heat Link ("Low voltage/dry contact combi boiler" setup as it says in the documentation). The reason that it was not 2 and 3 connector was that my Uponor C35 considered closed circuit to be "regular state" and open circuit to be "call for heat" state.
Everything seems to work fine for one exception: I see that my heating is sometimes ON, while it should be OFF.
For example, the current temperature in the room is 23 Celcius and the Thermostat is to set to heat up to 18 Celcius (which means it should NOT heat at all). And it works like that, but from time to time (say, 2-3 times a day) I notice that the floors are hot! and I see that the valves (that open the heating) are opened.
I can't figure out why it happens. It is either Nest thermostat for some reason gives the command to heat (when it shouldn't) OR it's some strange logic inside my Uponor C35 control system, which heats the floors even when Nest doesn't request it to do so. But such a situation doesn't happen on the zones with native Uponor thermostats.
Perhaps, Uponor control unit has a certain identification protocol of its native thermostats and it "feels" that not a native device is connected to the input.
Any ideas?
I just installed Google Nest Thermostat 3 Gen, made for Europe together with Uponor C35 underfloor heating system (my version of the Nest comes with a heat link, which is a separate device installed near my underfloor control system. The thermostat talks to Heat Link via wireless or wire (in my case it's a wired connection, which gives power to the thermostat as well)).
A small explanation is needed: I have 3 floor zones to heat with the underfloor heating system. I replaced a thermostat of one of the zones by the Nest thermo, the rest 2 zones are still controlled by the native Uponor thermostats. The source of heating liquid is central district heating station, so in house, we just control the valves that let the heating liquid flow into zones
I wired the Heatlink in place of a regular thermostat. So, from the point of view of my underfloor heating system (which is Uponor C35) - the Heat Link is placed instead of its regular thermostat.
I connected the wires to the 1 and 2 connectors on the Heat Link ("Low voltage/dry contact combi boiler" setup as it says in the documentation). The reason that it was not 2 and 3 connector was that my Uponor C35 considered closed circuit to be "regular state" and open circuit to be "call for heat" state.
Everything seems to work fine for one exception: I see that my heating is sometimes ON, while it should be OFF.
For example, the current temperature in the room is 23 Celcius and the Thermostat is to set to heat up to 18 Celcius (which means it should NOT heat at all). And it works like that, but from time to time (say, 2-3 times a day) I notice that the floors are hot! and I see that the valves (that open the heating) are opened.
I can't figure out why it happens. It is either Nest thermostat for some reason gives the command to heat (when it shouldn't) OR it's some strange logic inside my Uponor C35 control system, which heats the floors even when Nest doesn't request it to do so. But such a situation doesn't happen on the zones with native Uponor thermostats.
Perhaps, Uponor control unit has a certain identification protocol of its native thermostats and it "feels" that not a native device is connected to the input.
Any ideas?