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Our training room at work!

Mark discussing some hydronics and pump control via differential pressure when 2-way zone control valves are utilized. Surprisingly, we find jobs with VFD’s on their pumps but the pump never slows to save energy since all of the air handlers have 3-way valves allowing constant flow whether the zone is satisfied or not!  Perfect upgrade opportunity to install a 2-way valve or shut-off the by-pass flow when satisfied, .  

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