Chriswills Posted June 4, 2023 Share Posted June 4, 2023 https://www.resol.de/Produktdokumente/11204293_DeltaSol_CS4.monen.pdf I have the above Resol solar controller, everything works fine until the tank reaches its max setting at 70 deg. Once the pump is then switched off the temperature on the roof goes up to about 170 deg C and the pressure goes up to over 6 bar. The warning icon flashes then too. Is there a way to cool the collector or is this normal? Link to comment Share on other sites More sharing options...
Onoff Posted June 4, 2023 Share Posted June 4, 2023 I've all the bits here to do a solar thermal install, really need to get on with it this year. Is it that you need a heat dump like a radiator to deal with the excess heat? @Marvin might be able to shed some light. Link to comment Share on other sites More sharing options...
Chriswills Posted June 5, 2023 Author Share Posted June 5, 2023 Not a dump. Just wondered if there was a setting to cool the collector?? Link to comment Share on other sites More sharing options...
Marvin Posted June 5, 2023 Share Posted June 5, 2023 11 hours ago, Chriswills said: https://www.resol.de/Produktdokumente/11204293_DeltaSol_CS4.monen.pdf I have the above Resol solar controller, everything works fine until the tank reaches its max setting at 70 deg. Once the pump is then switched off the temperature on the roof goes up to about 170 deg C and the pressure goes up to over 6 bar. The warning icon flashes then too. Is there a way to cool the collector or is this normal? Hi @Chriswills Yes on your model there are settings for cooling. How it works I do not know. I do not know the settings for your particular system but it is normal a system to act like that. The system has to have a pressure reducing valve so when the temperature of the system goes very high, and the liquid in the system expands and the pressure gets too high, it runs overspill liquid into a plastic barrel. Hi @Onoff AS I understand it, the system temperature can go over the melting point of soldier and that is the reason why all pipe joints should be compression in the system... Link to comment Share on other sites More sharing options...
SteamyTea Posted June 5, 2023 Share Posted June 5, 2023 2 minutes ago, Chriswills said: Not a dump. Just wondered if there was a setting to cool the collector?? There were drain back systems that got around the problem, and the opposite freezing problem. As long as your pressurised system can handle the pressure, there should not be a problem, but even a couple of kilos of steam blowing off at 6 bar is potentially deadly. 1 Link to comment Share on other sites More sharing options...
Marvin Posted June 5, 2023 Share Posted June 5, 2023 Hi @Chriswills Page 29 of your manual discuss how the controller works - a lot more complicated than the old ones.... Link to comment Share on other sites More sharing options...
Chriswills Posted June 5, 2023 Author Share Posted June 5, 2023 Yes I did the info on manual for cooling OCC, I switched it on but still no joy Link to comment Share on other sites More sharing options...
Bramco Posted June 5, 2023 Share Posted June 5, 2023 From those manual pages, it looks like you can let the tank temperature run up to 95C - collector cooling - but after that it hits the same problem but with everything a bit hotter. Store cooling sounds like a non starter as you'd be cooling the tank off at night in anticipation of another sunny day, so if you didn't get that, the tank wouldn't have enough heat. Maybe what you need is a hot tap you can turn on using a temperature controlled switch. Just run off some of the excess heat when the tank reaches the point you feel safe at. Or you need a bigger tank, or a secondary tank. In the old house ours used to get pretty hot but never that hot. Simon Link to comment Share on other sites More sharing options...
Chriswills Posted June 5, 2023 Author Share Posted June 5, 2023 I just upgraded the tank to a 300 litre from 200. There are settings which allow it to cool the collector and the store but i don't know how to set it up. We have the pressure valve and drain off all set up so good there, just worries me to see 6 bar plus on these very hot days Link to comment Share on other sites More sharing options...
SteamyTea Posted June 5, 2023 Share Posted June 5, 2023 14 minutes ago, Chriswills said: just worries me to see 6 bar plus on these very hot days Me too. As I was waiting to order my coffee and plumber joined the queue behind me. I asked him what he thought. "(expletive deleted) that is a high pressure" But a quick Google shows it is not unusual. Link to comment Share on other sites More sharing options...
dpmiller Posted June 5, 2023 Share Posted June 5, 2023 At 70c you must have a tempering valve on your tank to protect users, so why not just increase store temp to 80c or more? Is this a drainback system? How many sensors are connected? what is the setting for EM, collector limit? Link to comment Share on other sites More sharing options...
Onoff Posted June 5, 2023 Share Posted June 5, 2023 1 hour ago, SteamyTea said: But a quick Google shows it is not unusual. I believe Tom Jones has a similar set up on his place. Link to comment Share on other sites More sharing options...
SteamyTea Posted June 5, 2023 Share Posted June 5, 2023 7 minutes ago, Onoff said: I believe Tom Jones has a similar set up on his place. But still no mobile signal in the valleys. Link to comment Share on other sites More sharing options...
Chriswills Posted June 5, 2023 Author Share Posted June 5, 2023 (edited) 2 hours ago, dpmiller said: At 70c you must have a tempering valve on your tank to protect users, so why not just increase store temp to 80c or more? Is this a drainback system? How many sensors are connected? what is the setting for EM, collector limit? EM is set at 130 sensoe on roof and one on tank. drainback installed ive been told not increase it anymore in temperature! Edited June 5, 2023 by Chriswills Link to comment Share on other sites More sharing options...
Bramco Posted June 5, 2023 Share Posted June 5, 2023 33 minutes ago, Chriswills said: ive been told not increase it anymore in temperature! Which one? You can leave the setting for the collector where it is. As above, turn on collector cooling (p30 in the manual). This will mean that if the tank has reached it's set point and the collector is getting too hot, the system will run, cooling the collector but warming the tank. Eventually, this will hit the maximum tank temperature of 95C and then the collector temperature will continue to rise. So if you've set up collector cooling, the system will automatically adjust things if too much heat is being generated by the collector. Sounds like the collector array has been sized to give you good output in the spring and summer but maybe a bit too much for the tank in the height of the summer. Simon Link to comment Share on other sites More sharing options...
Chriswills Posted June 5, 2023 Author Share Posted June 5, 2023 1 hour ago, Bramco said: Which one? You can leave the setting for the collector where it is. As above, turn on collector cooling (p30 in the manual). This will mean that if the tank has reached it's set point and the collector is getting too hot, the system will run, cooling the collector but warming the tank. Eventually, this will hit the maximum tank temperature of 95C and then the collector temperature will continue to rise. So if you've set up collector cooling, the system will automatically adjust things if too much heat is being generated by the collector. Sounds like the collector array has been sized to give you good output in the spring and summer but maybe a bit too much for the tank in the height of the summer. Simon Just checked it now and the roof temperature is showing 168 deg C and the pressure at 6 bar. I have switched on the OCC but nothing happens. The tank temp is set to a max of 70 deg C should that be increased to 95? Link to comment Share on other sites More sharing options...
Bramco Posted June 5, 2023 Share Posted June 5, 2023 The manual says that it does that automatically. You maybe need to experiment with the settings. V difficult to work out what's needed from a distance. Link to comment Share on other sites More sharing options...
Chriswills Posted June 5, 2023 Author Share Posted June 5, 2023 20 minutes ago, Bramco said: The manual says that it does that automatically. You maybe need to experiment with the settings. V difficult to work out what's needed from a distance. why they cant make these things simple is beyond me Link to comment Share on other sites More sharing options...
dpmiller Posted June 5, 2023 Share Posted June 5, 2023 I wouldn't expect it to immediately start doing things if it's already at elevated temperatures. Change the settings and monitor it tomorrow on heat-up. Link to comment Share on other sites More sharing options...
dpmiller Posted June 5, 2023 Share Posted June 5, 2023 ...but hang on, you say it's a drainback system? Are there any valves that have erroneously been shut off that might be restricting that? Link to comment Share on other sites More sharing options...
Chriswills Posted June 5, 2023 Author Share Posted June 5, 2023 Is this a drainback system? Not sure. Link to comment Share on other sites More sharing options...
dpmiller Posted June 5, 2023 Share Posted June 5, 2023 nope, that's just an overflow tank to catch anything from the safety valve. Link to comment Share on other sites More sharing options...
Dillsue Posted June 5, 2023 Share Posted June 5, 2023 If youve got ODB enabled for a drainback system then cooling options are disabled!!! See page 34 of the manual. You could increase the max cylinder temp Link to comment Share on other sites More sharing options...
Chriswills Posted June 5, 2023 Author Share Posted June 5, 2023 (edited) 22 minutes ago, Dillsue said: If youve got ODB enabled for a drainback system then cooling options are disabled!!! See page 34 of the manual. You could increase the max cylinder temp ODB is off as per factory setting, what can you safely increase the max cylinder temp to? Edited June 5, 2023 by Chriswills Link to comment Share on other sites More sharing options...
Chriswills Posted June 5, 2023 Author Share Posted June 5, 2023 5 hours ago, dpmiller said: I wouldn't expect it to immediately start doing things if it's already at elevated temperatures. Change the settings and monitor it tomorrow on heat-up. Its been on since yesterday and had no effect today, it must be another setting but i cant quite understand some of the instructions. I guess increasing the tank max temp would do it but is that safe? Link to comment Share on other sites More sharing options...
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