Which probes for my thermal installation?

[doumdoum]

Hello everyone. I have a house in the south of France, a ruin that I try to retype little by little since 20 years. I have to replace the 2 probes of my solar thermal system, the one that goes in the panels and that of the balloon. This is an old installation, 2003, brand Chromagen. It has been maintained, many things have been done, it just misses two small probes of nothing at all for it to work. Can someone tell me which probes I need to put and where can I buy them? The Chromagen factory sends me back to the installers, who send me back to the factory ... And when I insist with Chromagen, they tell me that my installation has 16 years and I must replace it entirely. While she is being maintained, and apart from that she works great!
Thank you very much in advance for all who can help me, because here I do not know how to do ...

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[izentrop]

Hello,

I need to replace the 2 probes of my solar thermal system

How do you know they are to be replaced?
If not, what gives the measurement to the ohmmeter?
If it is electrically cut or short-circuited, with a cutter you can carefully cut the protective sheath of the probe, to see the inscription that is noted there or the color code. If not give the value read the ohmmeter and if it varies by heating it between the fingers.
It is probably a thermistor of this kind https://fr.rs-online.com/web/p/products/5380733/

[doumdoum]

Hello Izentrop. Thank you very much for your answer, she seems to come from someone who knows it. It's concrete, finally! I tried another forum but it did not move me much.
So, to answer your questions: I know they do not work anymore because ... my installer told me! He pointed out to me that the circulator was working at night, and therefore cooled the water that was heated up during the day, because, according to him, the probes did not detect that the coolant was cooler than the balloon water.
I have not tested them yet with an ohm meter. In fact, I am in Belgium, I have one of two probes with me, but the other is at the supplier of my installer in France. I have to find someone with an ohmeter.
Maybe I have to order the probes you sent me the link to, and try the next time I go to my house (in July). Do you think that's likely to be this one?

[izentrop]

my installer told me! He pointed out to me that the circulator was working at night, and therefore cooled the water that was heated up during the day, because, according to him, the probes did not detect that the coolant was cooler than the balloon water.

That does not mean that a probe would fail. Since a thermistor is not a mechanical element, it is very unlikely that they will be involved. A fault on the electronic board or a faulty contact would be more likely. In this case it would take the complete electronic diagram and the programming instructions, what the manufacturers do not give anymore and apparently your repairer does not have?

[doumdoum]

Okay, so what do I do?

[Forhorse]

You do what the factory tells you, you replace the regulatory system ... we must be able to find that for not much on the net. At worst it's not the schemas / programs that are missing on the net to do it either (API, Arduino, etc ...)

[izentrop]

Same advice as Forhose, unless you are an experienced technician with the original docs, the best is to follow the advice of your installer.

[doumdoum]

Thank you Forhose and Izentrop.

you replace the regulatory system ... we must be able to find that for not much on the net.

For example this? https://boutique-solaire-diffusion.eu/r ... 603mc.html
It's still 323 €. After the 450 paid recently, plus 400 there is 3-4 years for interviews, it's expensive ecological hot water ... I should not start by trying the thermistors recommended by Izentrop https://fr.rs-online.com/web/p/products/5380733/ ?

[A.D. 44]

Hello,

There in your link at solar diffusion, you have selected a controller 6 inputs - 3sorties!

It is too much and not at all suitable for your cesi (if it is a cesi, solar hot water only).

A regulator with 2 inputs (2 probes) and 1 output (1 circulator) will amply suffice. And the price will not be the same.

For example at the same seller:

https://boutique-solaire-diffusion.eu/r ... r0301.html

[doumdoum]

Ah this is AD 44, that's it, now ok I know and I'll do that. Great. Hallelujah, thank you, I will be able to solve this problem that took my head for a long time. I hope it's not too difficult to install, because in the corner where I have this house (Haut Languedoc), there is not a plethora of specialists ... And I do not really know nothing in electronics. A big thank you to AD 44, Izentrop and Forhorse. And to Econology. I will think of you in the shower