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Grumman sunstream control unit
Have an old Grumman Sunstream control unit, previous owner said the heat exchanger was calcified. The solar fluid loop seems very restricted, a garden hose (about 30 - 40 PSI) attached at one end yields a pencil thick stream at the other, about a gallon per minute. Is this normal? The Grundfos UP15 - 42F spins nicely, and the impeller looks good, but i can't get it to pump. There was some black glunk in it and old yellowish antifreeze.
What should the flow be like, and what can i use to remove the calcification from the domestic hot water loop? I already ran CLR thru that loop for several hours (that pump worked fine). Should the CLR have been sufficient, or should i try a muriatic acid solution for good measure? Or white vinegar?
Should i do anything to the 332A panels which are copper?
Thanx for any advice!