Nest 3rd Gen & Ideal Logic+ System 30

[cliffa]

Hi Phil, I'm not sure if you ever found a solution to your problem but I found your thread when searching for Ideal System boilers that have separate control for CH and DHW. Most / all the Ideal boilers have an SL1 and SL2, but if you look at the wiring diagrams (not sure if accurate) some just common together the SL1 and SL2 so basically are just a wiring terminal 'help'. Others and it would appear to the Vouge and the Logic + (that you have) show separate control destinations for SL1 and SL2, to allow the boiler to operate at different temperature depending if the call for heat is from CH or DHW. Based on videos I've seen you can use these in conjunction with Opentherm. You need to change the 'plan' to Domestic Hot Water Priority or X Plan and use a NO valve on the CH circuit. I've just bought a NEST stat to do this. HTH.

 

[chrisk801]

Hi Phil, I'm not sure if you ever found a solution to your problem but I found your thread when searching for Ideal System boilers that have separate control for CH and DHW. Most / all the Ideal boilers have an SL1 and SL2, but if you look at the wiring diagrams (not sure if accurate) some just common together the SL1 and SL2 so basically are just a wiring terminal 'help'. Others and it would appear to the Vouge and the Logic + (that you have) show separate control destinations for SL1 and SL2, to allow the boiler to operate at different temperature depending if the call for heat is from CH or DHW. Based on videos I've seen you can use these in conjunction with Opentherm. You need to change the 'plan' to Domestic Hot Water Priority or X Plan and use a NO valve on the CH circuit. I've just bought a NEST stat to do this. HTH.

Hi cliff,
Did you have any luck with this? Were you able to set up the Ideal heat boiler to allow two temperatures, one for CH via OpenTherm and one for DHW without?

 

[cliffa]

Hi Chris, yes I did. I uploaded circuit diagrams to the urbanplumbers yt channel. Basically you use a combination of OT for CH and SL2 live overrides for 80degree DHW. No connection on SL1. All working great apart from short cycling on CH when room set temperature is reached because boiler doesn't modulate down quickly enough or to low enough output.

 

[telerob]

Hi Chris, yes I did. I uploaded circuit diagrams to the urbanplumbers yt channel. Basically you use a combination of OT for CH and SL2 live overrides for 80degree DHW. No connection on SL1. All working great apart from short cycling on CH when room set temperature is reached because boiler doesn't modulate down quickly enough or to low enough output.

Hi @cliffa , could you post a link to the circuit diagram if possible?

 

[cliffa]

Hi @cliffa , could you post a link to the circuit diagram if possible?

Sure no problem https://drive.google.com/file/d/1xEyJC3A7vWvTFYIfDpXszlZvcTZYYp0N/view?usp=drivesdk and https://drive.google.com/file/d/1AscxnAdLQM1P4HdYxeEKT0JW8T5Ejyda/view?usp=drivesdk

 

[telerob]

Sure no problem https://drive.google.com/file/d/1xEyJC3A7vWvTFYIfDpXszlZvcTZYYp0N/view?usp=drivesdk and https://drive.google.com/file/d/1AscxnAdLQM1P4HdYxeEKT0JW8T5Ejyda/view?usp=drivesdk

Thanks for this @cliffa , I don't have an external pump so diagram one looks spot on.