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Variable speed drives (VSDs) are less expensive and more reliable than a decade ago, paving the way for new best practices when specifying pumps. Traditionally, pumps have been specified with impellers trimmed to deliver peak load without overloading the pump motor. But is all that trimming necessary…?
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Hydronic HVAC systems must maintain at least a minimum flow through centrifugal pumps, otherwise the pumps….
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What is a variable primary chilled water system? How does it differ operationally from a primary/secondary system? And why might you choose one chilled water design approach over the other? In this series on Variable-Primary Chilled Water Systems, we’ll be answering…
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What happens when demand drops in a closed loop variable speed system? What is the operational sequence and what logic does the controller use to vary the speed of the pump? Let’s begin our discussion with the following...
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We are now three blogs into our series on Variable Speed Pump Control and we are going to hit the pause button and review some fundamentals. If sequentially that seems like a strange thing to do, there is a method to our madness...
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