Nest Gen 3 Heatlink Control Of Infrared

[jb26]

Hi,

I would appreciate any insight into using the nest product with Infrared panels in the UK.

I am planning to use Nest vs the specified infrared panel control for simplicity and the ability to detect when the house is vacatant through Motion Sensing/AutoAway. Infrared heater response is quicker than convection or radiant so should perform more efficiently. Also plan to couple to Octopus Agile Tarriff.

My initial thought is to use Solid State Relay that has 4-32V DC control, connecting that to the Nest Common/Call for heat terminals 2&3 with power from T1 & T2. See indicative diagram below.

Is this the way to go?

Regards,
John

Relay: Heschen Single Phase DC/AC Solid State Relay, SSR-40DA, Input 4-32VDC, Output 24-480VAC, 40A 50-60Hz...

[AlexD]

Hi @jb26 , thanks for reaching out here. I would do what I can to try and assist.

Keep in mind that the T1 and T2 terminals are only designed to be connected to the thermostat display as they provide both power and communication with it through the thermostat base. Using the terminals in other connections could lead to unexpected behaviours. 

Also, just keep in mind that the Heat Link is designed for a load of a maximum of 3 amps. 

[UanaC]

Hello there! Just checking in with you. Did you see my colleagues previous message?

[jb26]

Yes I did.  
Still hoping someone has experience with infra red. 
T1&2 appreciate that the are 12v and signalling to powers thermostat, the solid state relay will be high resistance, unclear when drawing  very tinycurrent if there will be an issue.  Thermostat would be connected wirelessly. 
3amp max, this is what a relay on the line only, 12v and near zero current with solid date state relay.  

still curious if anyone used with infra red and if the heating profile of infrared works well with nest. Since using an on/off rather that variable regulation of power does it switch on and off a lot? I was thinking to use the direct sunlight option to suppress any direct feedback from the infrared. Will also position the thermostat out of direct infrared path.  

Looking forward to hear of other infrared installations. 

[UanaC]

Got it. I'm indeed not sure how the infrared panels work, but if this is an electric panel this is not compatible. The Nest Learning thermostat is compatible only with hydroponic systems. Here's a link with the compatibility checker in case this helps in any way: https://goo.gle/3JWEXuU. I'm really sorry that we cannot provide you with more information at the moment. Please let me know if there's anything else I might help you with today.

[jb26]

I think it will work with relay, simple on off control that will be possible for higher current owing to the relay. 

I could use 240 v on the input side of relay with different spec of relay. 

well I have ordered components, let’s see how it goes. 

fyi internally heat pump for example is switched like a relay since it’s power requirement for heat is more than 3amp. 

[Vladut]

Thank you so much for all the details. Let me know how it goes with the components.

[OannaCG]

Hello, just checking in, any update? Do you still need our help?

[jb26]

I plan to post back in 3 weeks when up and running with hopefully positive outcome. 

[TudorL]

In this case, I'll close this thread, but if you need any assistance, you can always open a new one! Have a good one and stay safe! 

[jb26]

To close out the thread, electrician installed a nest in each room controlling infra red panels, where there was more than three amps a solid state relay was used 240v control/input.  All works nicely.  Need to wait to winter to see how the neat and infra red manage the heating curve, but high hopes to avoid lots of switching.  

plus one of the thermostats also controls the sunamp heat battery for hot water 🙂

nice outcome.  

[Paul_R · Accepted solution]

Hi there! I'm glad to hear that everything worked out. Would there be anything else I or my colleagues can assist you with?

[jb26]

All good! Thank you for your support.  

I decided to not use 12v for relay and instead 240v off the feed for the Heatlink.  

[Jenelyn_O]

Hi there,

Thanks for keeping us in the loop. Please feel free to let us know if you have any questions or concerns in the future, as we'll be willing to assist you.

I appreciate the input, Paul.

Best,

Jenelyn