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309.2.2 Hydronic system balancing

Minnesota Mechanical Code 2015 > 3 General Regulations > 309 Temperature Control > 309.2 Balancing > 309.2.2 Hydronic system balancing
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Hydronic systems shall provide flow rates within +/-10 percent of design capacities and pump impellers shall be trimmed or pump speed shall be adjusted to meet design flow conditions.
Exception: Impeller trimming or speed adjustment is not required for pump motors rated at five horsepower (3.73 kW) or less.
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