DIY Heater Remote

[hanerd]

Hey Folks. I’m looking for a little bit of guidance here to make sure I’m not going to blow things up.

I just a 12K gal inground saltwater pool installed. I have a Hayward H250FDN Heater. I’m a heavy user of Home Assistant and quite adept at automating things so I want to automate my heater.

My current working idea is to get 3 DS18B20 temperature sensors to measure ambient air temp, intake, and return temperatures. I’d then use a relay to control the Hayward heater on/off and Home Assistant to control the temperature set points and pump on / off.

Now my question: To control the heater, do I simply need to connect 24VAC to the 2-wire remote thermostat terminals? IE: COM and POOL and use the relay to switch the POOL leg? If so, can I get away with using a 24VAC wall wart like for a sprinkler controller?

Thanks in advance. The contractor is currently here getting it ready for summer and I’m so excited to use it and if this works, I’d love to post a write up as well. Googling hasn’t really gotten me very far on this specific scenario.

 

[ajw22]

Now my question: To control the heater, do I simply need to connect 24VAC to the 2-wire remote thermostat terminals? IE: COM and POOL and use the relay to switch the POOL leg? If so, can I get away with using a 24VAC wall wart like for a sprinkler controller?

You do not put 24V AC on the circuit. The heater provides the 24V AC.

You just need to use a relay to close the remote thermostat circuit when you want the heater to run.

 

[tjwise]

Hey Folks. I’m looking for a little bit of guidance here to make sure I’m not going to blow things up.

I just a 12K gal inground saltwater pool installed. I have a Hayward H250FDN Heater. I’m a heavy user of Home Assistant and quite adept at automating things so I want to automate my heater.

My current working idea is to get 3 DS18B20 temperature sensors to measure ambient air temp, intake, and return temperatures. I’d then use a relay to control the Hayward heater on/off and Home Assistant to control the temperature set points and pump on / off.

Now my question: To control the heater, do I simply need to connect 24VAC to the 2-wire remote thermostat terminals? IE: COM and POOL and use the relay to switch the POOL leg? If so, can I get away with using a 24VAC wall wart like for a sprinkler controller?

Thanks in advance. The contractor is currently here getting it ready for summer and I’m so excited to use it and if this works, I’d love to post a write up as well. Googling hasn’t really gotten me very far on this specific scenario.

Did you get this working to your liking? Care to fill us in? I also use HomeAssistant and will be doing similar automations.

 

[guinness]

Take a look at the NodeJS Pool Controller project.

Heater Question · Discussion #544 · tagyoureit/nodejs-poolController

I currently have my stand alone Nixie controller in my "lab" (i.e. not in production with my pool yet). In testing, I'm not getting 24vAC when I activate the heater relay. Everything ...

github.com