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November 17, 2003: Pump cavitation issue

Every now and then, the pump that feeds my 2nd floor radiators would cavitate (stop pumping due to a trapped air bubble).  I would then hook up my charge pump and purge the bubble by forcing it out of the system with the high pressure flow.

This got pretty tedious especially in the colder months when I would come in in the morning to find a cold office!  So I figured the problem was the orientation of the pump.  In the horizontal position - water entering right and exiting left allows bubbles to get trapped in the pump body:

So I re-plumbed the pump to orient the flow vertically:

It will take a few weeks before I'm sure that this is a good fix.

A few days later:  Problem not solved - see next page!

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