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E 503.6.5.3.2 Hydronic System Balancing
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Hydronic systems shall be proportionately balanced in a manner to first minimize throttling losses; then the pump impeller shall be trimmed or pump speed shall be adjusted to meet design flow conditions.
Exceptions: Impellers need not be trimmed nor pump speed adjusted.
- For pumps with pump motors of 10 hp (7.5 kW) or less.
- Where throttling results is not greater than 5 percent of the nameplate horsepower draw, or 3 hp (2.2 kW), whichever is greater, above that required where the impeller was trimmed. [ASHRAE 90.1:6.7.2.3.3]
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