ASHRAE-90.1-2022- - Page 119
Extracted Content
Table 6.8.1-5 Warm-Air Furnaces and Combination Warm-Air Furnaces/Air-Conditioning Units, Warm-Air Duct
| Furnaces, and Unit Heaters—Minimum Efficiency Requirements (Continued) | Col2 | Col3 | Col4 | Col5 | Col6 | Col7 | Col8 | Col9 |
|---|---|---|---|---|---|---|---|---|
| Equipment Type | Equipment Type | Equipment Type | Equipment Type | Equipment Type | Equipment Type | Equipment Type | Minimum Efficiency b | Test Procedure a |
| Description | Fuel | Electric Power Phase | Application Location | Heating Capacity (input), Btu/h b | Combo-Unit Cooling Capacity, Btu/h | Subtype | Subtype | Subtype |
| Warm-air furnace | Oil | 3 | All | <225,000 | All | Nonweatherized | 83%AFUE | Appendix N g |
| Warm-air furnace | Oil | 3 | All | <225,000 | All | Weatherized | 78%AFUE or 80%Et d | Appendix N g |
| Warm-air furnace | Oil | 3 | All | <225,000 | All | Weatherized | 78%AFUE or 80%Et d | Section 42 UL 727 |
| Warm-air furnace | Oil | All | All | ≥225,000 | All | All | 81%Et d before 1/1/2023 82%Et d after 1/1/2023 | Section 42 UL 727 |
| Warm-air furnace | Electric | 1 | Inside U.S. | <225,000 | <65,000 | See Informative Appendix F, Table F-4 f | See Informative Appendix F, Table F-4 f | See Informative Appendix F, Table F-4 f |
| Warm-air furnace | Electric | 1 | Inside U.S. | <225,000 | ≥65,000 | All | 96%AFUE | Appendix N g |
| Warm-air furnace | Electric | 1 | Outside U.S. | <225,000 | All | All | 96%AFUE | Appendix N g |
| Warm-air furnace | Electric | 3 | All | <225,000 | All | All | 96%AFUE | Appendix N g |
| Warm-air duct furnaces | Gas | All | All | All | All | All | 80%Ec d | ANSI Z83.8 |
| Warm-air unit heaters | Gas | All | All | All | All | All | 80%Ec d,e | ANSI Z83.8 |
| Warm-air unit heaters | Oil | All | All | All | All | All | 80%Ec d,e | Section 40 UL 731 |
a. Section 13 contains a complete specification of the referenced test procedure, including the referenced year version of the test procedure. For this table, the following applies:
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Appendix N = 10 CFR 430 Appendix N
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ANSI Z21.47 = Section 2.39, Thermal Efficiency, ANSI Z21.47
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ANSI Z83.3 = Section 2.10, Efficiency, ANSI Z83.3
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UL 727 = Section 42, Combustion, UL 727
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UL 731 = Section 40, Combustion, UL 731 b. Compliance of multiple firing rate units shall be at the maximum firing rate. c. Et = thermal efficiency . Units must also include an interrupted or intermittent ignition device (IID), have jacket losses not exceeding 0.75% of the input rating, and have either
power venting or a flue damper . A vent damper is an acceptable alternative to a flue damper for those furnaces where combustion air is drawn from the conditioned space . d. Ec = combustion efficiency (100% less flue losses). See test procedure for detailed discussion. e. Units must also include an interrupted or intermittent ignition device (IID) and have either power venting or an automatic flue damper . f. Includes combination units with cooling capacity <65,000 Btu/h. For U.S. applications of federally covered <225,000 Btu/h products, see Informative Appendix F, Table F-4. g. 10 CFR 430 is limited to-single phase equipment that is not contained within the same cabinet with a central air conditioner whose rated cooling capacity is above 65,000 Btu/
h but for the test and rating procedures are not impacted for three-phase and can be used for AFUE ratings for ASHRAE/IES Standard 90.1 three-phase products and single-phase products with a cooling capacity greater than 65,000 Btu/h.
ANSI/ASHRAE/IES Standard 90.1-2022 (I-P) 117