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6.5.4.1 Boiler Turndown
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Boiler systems with design input of at least 1,000,000 Btu/h shall comply with the turndown ratio specified in Table 6.5.4.1.
The system turndown requirement shall be met through the use of multiple single-input boilers, one or more modulating boilers, or a combination of single-input and modulating boilers.
Table 6.5.4.1 Boiler Turndown
| Boiler System Design Input, Btu/h | Minimum Turndown Ratio |
|---|---|
| ≥1,000,000 and ≤5,000,000 | 3 to 1 |
| >5,000,000 and ≤10,000,000 | 4 to 1 |
| >10,000,000 | 5 to 1 |
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