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common returns on 2 boilers
I removed a lgb6 from an old frat house and replaced it with 2 boilers. the house had an addition put on in the 60s and they installed zone valves on the two supply pipes. Old side of house has cast radiators, new has fintube convectors. The zone valves did not have a condensate drain on them, so as you guessed it, they trapped water and blew apart within months of being installed. I cut the header out, sized the radiators, and tried to split the front and rear. Now the boiler on the rear is flooding and the front boilers water feeder shows 66 gallons fed in one week. So obviously I have a condensate line crossed somewhere... problem is finding it. House is 10000 sqft atleast. Basement is entirely finished. And all piping covered in asbestos. Is it possible to connect the returns together at the boilers? Or am I asking for boiler water level nightmares if I do?