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Direct Return Pump Question
Good evening. Pondering some would be circumstances on a job I looked at. From the look of the piping it looks to be direct return. Boiler like most is over sized. Piping over sized. Radiators much larger than needed. Assuming it is a direct return system at this point. With three zones, each for its own floor, cast iron wall radiators all around the home. Calculating the DT and reverse doing the math to plot it on the current pump, I see that the Bumble Bee will fit the bill. Staying away from calculating using worst case scenario length x .06 because the pump will be grossly over sized in comparison to what is there and has been working for 15 years.
My question is, when the pump slows down to widen the dt, will the water short circuit through the closest radiators due to the lack of constant head pressure? Adding trvs under each radiator is out of the question.
Ideas and advise welcome.