If a fixed-speed circulator is selected, a differential pressure bypass valve should be installed to reduce the potential for flow noise when only one or two zones are active.

Question

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When only one or two zones are active, the flow rate through the system may be less than what the circulator is designed for, leading to potential flow noise. Installing a differential pressure bypass valve helps to maintain a consistent flow rate and reduce the noise. This is especially important for fixed-speed circulators, which do not have the ability to adjust their speed based on the system demand.

If a Fixed-Speed Circulator Is Selected, a Differential Pressure Bypass