Graham Chiu wrote:I've got 20 evacuated tubes on my roof oriented NW, and I'm wondering if my system is working or not.
It's connected to a Resol DeltaSol BX controller.
The controller is saying that at peak sun my controller is only registering 31 deg C (89F) at the tail end of summer. It's 20C today outside.
I went on the roof to check if there were any obvious damage, and there wasn't. But feeling the tubes, only 5 of the 20 were cold, and 15 were warmish.
We don't really get below 0C most years so I doubt the tubes have ruptured inside.
Does this mean it's likely that 15 of my STS Sunsaver tubes have failed?
Graham Chiu wrote:Does this help?
Graham Chiu wrote:The installation documents say it's an Open-loop system using water as the heat transfer fluid type.
When I heat the water up in the cylinder using the 3kW element, the temperature in the collector also goes up which I thought was odd. It was setup to pump only if the difference in temperature between the collector and the bottom of the tank sensor was greater than 6K. So, why would it pump hot water up to the collector?
hard to say it sure seems like it if you can heat up the collector. Ok so you are most of the way there. Tou know the controller works and the pump... leaving the tubes.
Graham Chiu wrote:I'm in Wellington, New Zealand. We don't have freezing in our pipes.
I think the controller is fine. If I set the delta low enough for the conditions the pump starts working ie. collector sensor is greater than bottom tank sensor + 6K. Could the water from the bottom of the tank thermosiphon back to the collector when I apply power?
I'm not sure how to remove the glass tubes. Never got shown how to do it.
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