Nest 3rd Gen True Radiant mode and relay activation

[gingham-foliage]

Hi,

Do the relays still activate on the Nest heat link when the Nest is configured in True Radiant mode?

Thanks,

[AnaM]

Hey @gingham-foliage,

Thank you for reaching out. The Heat Link relays switch when the heating or hot water gets turned on or turned off.  With True Radiant, your thermostat learns how long your radiant system takes to heat up your home. It'll turn the heat on early to reach the scheduled temperature, then turn it off early so your home won't heat over the temperature you want, but since it still activates and deactivates, your relays will need to switch. Therefore, True Radiant has no impact on the relays.

Let me know if you have any other questions.

[gingham-foliage]

Thanks AnaM. Will this still happen when True Radiant mode is enabled and the Heat Link is also attached to an OpenTherm boiler?

[DragosC · Accepted solution]

Here the situation is a bit different. Since the OpenTherm module is not an on/off switch, it's continuously on, but increasing intensity only, the relays are not active. You can either wire the Heat Link to the 1 2 3 4 5 6 terminals for on/off switch with relays, either to the OT1 OT2 terminals which are specific for the OpenTherm. Where do you want to wire it? 

[DragosC]

Hi there. I'm just following up on our last message. Do you still need our help? Keep us posted. 
 

[DragosC]

Since I haven't heard from you in a while, I'll have to close this thread. Should anything else come up, please open another thread and we'll take it from there. Have a good one and stay safe!