In fairness to all, we don't discuss pricing on the Wall. Thanks for your cooperation.
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!