10 CFR 431.86 – Uniform test method for the measurement of energy efficiency of commercial packaged boilers
(a) Scope. This section provides test procedures, pursuant to the Energy Policy and Conservation Act (EPCA), as amended, which must be followed for measuring the combustion efficiency and/or thermal efficiency of a gas- or oil-fired commercial packaged boiler.
(b) Testing and Calculations. Determine the thermal efficiency or combustion efficiency of commercial packaged boilers by conducting the appropriate test procedure(s) indicated in Table 1 of this section.
Table 1—Test Requirements for Commercial Packaged Boiler Equipment Classes
| Equipment category | Subcategory | Certified rated input Btu/h | Standards efficiency metric (§ 431.87) | Test procedure (corresponding to standards efficiency metric required by § 431.87) |
|---|---|---|---|---|
| Hot Water | Gas-fired | ?300,000 and ?2,500,000 | Thermal Efficiency | Appendix A, Section 2. |
| Hot Water | Gas-fired | >2,500,000 | Combustion Efficiency | Appendix A, Section 3. |
| Hot Water | Oil-fired | ?300,000 and ?2,500,000 | Thermal Efficiency | Appendix A, Section 2. |
| Hot Water | Oil-fired | >2,500,000 | Combustion Efficiency | Appendix A, Section 3. |
| Steam | Gas-fired (all*) | ?300,000 and ?2,500,000 | Thermal Efficiency | Appendix A, Section 2. |
| Steam | Gas-fired (all*) | >2,500,000 and ?5,000,000 | Thermal Efficiency | Appendix A, Section 2. |
| >5,000,000 | Thermal Efficiency | Appendix A, Section 2. OR Appendix A, Section 3 with Section 2.4.3.2. | ||
| Steam | Oil-fired | ?300,000 and ?2,500,000 | Thermal Efficiency | Appendix A, Section 2. |
| Steam | Oil-fired | >2,500,000 and ?5,000,000 | Thermal Efficiency | Appendix A, Section 2. |
| >5,000,000 | Thermal Efficiency | Appendix A, Section 2. OR Appendix A, Section 3. with Section 2.4.3.2. |
* Equipment classes for commercial packaged boilers as of July 22, 2009 (74 FR 36355) distinguish between gas-fired natural draft and all other gas-fired (except natural draft).
(c) Field Tests. The field test provisions of appendix A may be used only to test a unit of commercial packaged boiler with rated input greater than 5,000,000 Btu/h.