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How to skim and stage two steam boilers

I have a two part question. I inherited a account that has two Slant Fin LD-40 steam boilers firing @ 1.5gal. They are replacements for an older single boiler. There is a lot of surging and foaming in the glass. Also both burners are wired off of TT into one thermostat. No isolation period. What would be a good control to stage each boiler as needed? Thankyou....Don McIntyre aka freondon


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