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Lochinvar Knight, calcium chunks in heat exchanger
I have a Lochinvar Knight boiler installed @ a apt. complex. The boiler circ. pump went out the other day and caused it to over temp. creating a rattle, banging, and flashing. Once the pump was replaced and flow switch fixed I noticed vibrations and a 'tinging' sounds in the lines. Took the pumps apart and found calcium chunks stuck in them. Tried to flush out but can not get them all out. Was told to flush system out with acid. Called Lochinvar to get recommendations............. nothing of course. They said to flush it out, but not what to use. Didn't want to void there own warranty. Any suggestions?
Class 'A' Gas Fitter - Certified Hydronic Systems Designer - Journeyman Plumber