// CODE SNIPPET
6.7.2.3.3 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 to 6.7.2.3.3
Impellers need not be trimmed nor pump speed adjusted
- for pumps with pump motors of 10 hp or less or
- when throttling results in no greater than 5% of the nameplate horsepower draw, or 3 hp, whichever is greater, above that required if the impeller was trimmed.
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