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<blockquote data-quote="metalheadjoe" data-source="post: 8788582" data-attributes="member: 581422">The benefit of a VFD is you don&#039;t have to run the pump on/off or full-bore all the time. You can either modulate the pump speed using an external signal or you can set a static speed anywhere from 0-60hz or even higher when spec&#039;d. The pump being oversized is a non-issue when it&#039;s run off a drive; you can throttle it down to meet the other system requirements.If the plumbing isn&#039;t being changed, I don&#039;t see how it will be an issue with the new pump but not the old pump. I apologize if I missed it: are you saying the equipment that requires water was replaced with equipment that requires higher pressure? If so, I think you need to do something drastic like redesigning the entire loop or adding booster pumps or 3-way valves as you already mentioned. It sounds like the whole system needs to be reevaluated, though I suspect that&#039;s already the plan if the bill is $60k.</blockquote>

[QUOTE="metalheadjoe, post: 8788582, member: 581422"] The benefit of a VFD is you don't have to run the pump on/off or full-bore all the time. You can either modulate the pump speed using an external signal or you can set a static speed anywhere from 0-60hz or even higher when spec'd. The pump being oversized is a non-issue when it's run off a drive; you can throttle it down to meet the other system requirements. If the plumbing isn't being changed, I don't see how it will be an issue with the new pump but not the old pump. I apologize if I missed it: are you saying the equipment that requires water was replaced with equipment that requires higher pressure? If so, I think you need to do something drastic like redesigning the entire loop or adding booster pumps or 3-way valves as you already mentioned. It sounds like the whole system needs to be reevaluated, though I suspect that's already the plan if the bill is $60k. [/QUOTE]

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