I see I am labelled a "newbie". Well that's the truth! Please remember guys that I don't talk "plumb". Think of me as a complete ignoramus. That would be true too. So Integrated (reply 2) I'm not sure what the baffle is in the 5 way valve. I'm hopeful that it is in fact a way of discouraging cold water from entering when it shouldn't? It seemed to me that without a way of separating the two flows, it was operating on fond hopes rather than good design. But I was assured it was just empty space in there. If you could send me a link that would show me the internal structure of this bit of brass, I'd be very grateful. I've been trying to find out for weeks.
Similarly Karma (number 4) Open loop? open vent flood level? Is this what I've been calling the level in the header pipe? If so, the top of it is well above the panels - but maybe not far enough. I assume you are saying that in your opinion an air vent on the collector isn't compatible with a header pipe? ('scuse my newbie vocab). It certainly doesn't work. Neither it nor the thingie with the yellow cap have ever seen action as far as I can tell. Which tells me my safety mechanisms aren't functional. You can see then why I called a halt when instead of identifying the cause of this sudden change, it was suggested that a valve be put in the header pipe, which I gather was supposed to increase the pressure in the tank? This was apparently like extending the height of the header pipe and would give me more pressure in the hot water system ( and stop the water from escaping out onto the roof). Having experience 180 litres of scalding hot water dancing about in my airing cupboard as steam bubbles fought to get out the header pipe, I wasn't keen to make it any more difficult for them to get out.
I can't answer your question about rating right away. But I will try to find out.
The settings on the collector have all been checked. However, since it is totally unable to keep time, I have no faith in its other functions. This is a sticking point with the installer as yet unresolved. He has a tendency just to not answer awkward questions.
The sudden change occurred on the morning of a hot sunny day. OK at breakfast. Loopy by lunchtime.
We get heaps of power cuts. But I always reset the controller. And since it is a rotten timekeeper and I'm forever putting the thing off and on as I try to get the circuit operating without just dribbling it out the roof, it is reset timewise several times a day. Perhaps it is as confused as I am.
I've checked fairly carefully that what is happening is that cold water is entering when it should not. At normal pressure, when the pump goes on, Cold water enters the 5way valve and cools the collector quickly, reducing the temperature differential and putting the pump off. It also increases the pressure in the HWC and shoots water out the header pipe. The diff. picks up quickly, starts the pump and the whole thing repeats. I'm trying to persuade the solar guy to send this controller to wherever they go when they go psycho and let me have another in the meantime.
Thanks guys.
Teatime. Cooking calls.