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SOLAR HEATING SYSTEM CONSTRUCTION LOG
September 24, 2006: Re-plumbing manifold
At this time of year (early fall) I fill my collectors with anti-freeze, and generally "fire-up" my heating system. This year as before I found that the circulation pump that runs the ground floor loop was cavitating. Because this pump is mounted horizontally an air bubble gets caught in the pump preventing it from working. I tried to purge the pump by forcing water through it with pressure from a garden hose brought over from the house 100 feet away. (I don't have a water supply in the workshop.) No good, it still cavitated. A few years ago I had changed the orientation of the 2nd floor circulator and I also added an automatic air vent to eliminate trapped air in the system.
I decided to re-plumb the
manifold for 2 reasons:
As you can see my plumbing is a bit wonky, and I burned the plywood board with the blow torch while removing the old plumbing -- but it holds pressure! Best of all I no longer have cavitation issues!