NPD Series of Dual Circuit Non-Pressurized Flow Centers

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The Dual Circuit NP Flow Center is the appropriate strategy to use a single loop field to serve 2 heat pumps and still have all the benefits of a non-pressurized flow center. Using the Grundfos UPS26-99, UPS26-116 (1 or 2 on each circuit) & the UPS 60-150 (1 on each circuit). Once you calculate the required full load flow rate & corresponding pressure drop you can use the following pump curves to help select whether you need (1) or (2) pumps for each of the two circuits. UP26-99, UPS26-99 & UPS26-116 Show more