Quote:
Originally Posted by Mikesolar
Use a RESOL BS2 controller (good German brand) but also put a secondary sensor (it can just be any old switch that only turns on above 20C) on the panel to prevent the controller from switching on at night. They seem to have this issue often enough and at -20C it is a big problem. It is a problem with glycol systems too. I have had 4 failures in the last 2 winters because of this.
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Can you write more about that? I use a Resol DeltaSol BS Pro controller and have occasionally noticed it running the pump when I wouldn't have expected it to. I thought it was something to do with what the manual calls OTC Tube Collector Special Function, where a 2-degree rise in collector temperature causes a 30-second running of the pump, but now you have put a doubt in my mind.
When you say to only turn on above 20C do you mean 20C tube temperature, not 20C ambient?