Wednesday, January 25, 2012

Surya Layout with Tubes added

25 Jan 2012: This diagram shows schematically how the new tubes will be added to the existing system. I have done a more detailed diagram of the existing for myself which is too 'busy' with detail to put on here. This diagram gets across the essentials, good enough for publication.
aaarrgh, I have just realised that this is also wrong... with this, the ground
loop would be forced through the tubes if the Sunbox was not operating!
One problem has been deciding what to do with the 3 port valve. I needed it before because even with the pump in the loft not operating, the pump is sufficiently transparent for liquid to more round illegally. The early system had a 2 port solenoid valve to stop this happening. With the current set up, the whole lot flows through the Surya Sunbox when it operates, but we could not have this happening through the tubes which have smaller pipes. It seems that the system may have to have three solenoid valves. 
• The existing 3 port valve to divert flow up to the Sunbox.
• The Tubes will need a 2 port valve to stop liquid moving round these accidentally when the Sunbox is working. 
• If the Sunbox is not working but the Tubes are, there would be illegal movement of liquid through the Sunbox.

While writing this, I have realised that this diagram is also wrong! More thought is needed!


15 Feb Postscript: I have now updated the circuit diagram and got it working!

2 comments:

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