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C406.2 Efficient HVAC Performance
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Equipment shall meet the minimum efficiency requirements of Tables C406.2.(1) through C406.2(7) in addition to the requirements in Section C403 . This section shall only be used where the equipment efficiencies in Tables C406.2.(1) through C406.2(7) are greater than the equipment efficiencies listed in Table C403.2.3(1) through 403.2.3(7) for the equipment type.
| EQUIPMENT TYPE | SIZE CATEGORY | SUBCATEGORY OR RATING CONDITION |
MINIMUM EFFICIENCYa | |
| CLIMATE ZONES 1 - 5 |
CLIMATE ZONES 6 - 8 |
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| Air conditioners, air cooled |
< 65,000 Btu/h | Split system | 15.0 SEER 12.5 EER |
14 SEER 12 EER |
| Single package | 15.0 SEER 12.0 EER |
14.0 SEER 11.6 EER |
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| ≥ 65,000 Btuh/h and < 240,000 Btu/h |
Split system and single package | 12.0 EERb 12.54 IEERb |
11.5 EERb 12.0 IEERb |
|
| ≥ 240,000 Btu/h and < 760,000 Btu/h |
Split system and single package | 10.8 EERb 11.3 IEERb |
10.5 EERb 11.0 IEERb |
|
| ≥ 760,000 Btu/h | — | 10.2 EERb 10.7 IEERb |
9.7 EERb 10.2 IEERb |
|
| Air conditioners, water and evaporatively cooled |
— | Split system and single package | 14.0 EER | 14.0 EER |
For SI: 1 British thermal unit per hour = 0.2931 W.
- IEERs are only applicable to equipment with capacity modulation.
- Deduct 0.2 from the required EERs and IPLVs for units with a heating section other than electric resistance heat.
| EQUIPMENT TYPE | SIZE CATEGORY | SUBCATEGORY OR RATING CONDITION |
MINIMUM EFFICIENCYa | |
| CLIMATE ZONES 1 - 5 |
CLIMATE ZONES 6 - 8 |
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| Air cooled (Cooling mode) |
< 65,000 Btu/h | Split system | 15.0 SEER, 12.5 EER |
14.0 SEER, 12.0 EER |
| Single package | 15.0 SEER, 12.0 EER |
14.0 SEER 11.6 EER |
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| ≥65,000 Btu/h and < 240,000 Btu/h |
Split system and single package | 12.0 SEER, 12.4 EER |
11.5 EERb, 12.0 IEERb |
|
| ≥ 240,000 Btu/h | Split system and single package | 12.0 SEER, 12.4 EER |
10.5 EERb, 10.5 IEERb |
|
| Water sources (Cooling mode) |
< 135,000 Btu/h | 85°F entering water | 14.0 EER | 14.0 EER |
| Air cooled (Heating mode) |
< 65,000 Btu/h (Cooling capacity) |
Split system | 9.0 HSPF | 8.5 HSPF |
| Single package | 8.5 HSPF | 8.0 HSPF | ||
| ≥ 65,000 Btu/h and < 135,000 Btu/h (Cooling capacity) |
47°F db/43°F wb outdoor air | 3.4 COP | 3.4 COP | |
| 17°F db/15°F wb outdoor air | 2.4 COP | 2.4 COP | ||
| ≥135,000 Btu/h (Cooling capacity) |
47°F db/43°F wb outdoor air | 3.2 COP | 3.2 COP | |
| 77°F db/15°F wb outdoor air | 2.1 COP | 2.1 COP | ||
| Water sources (Heating mode) |
< 135,000 Btu/h (Cooling capacity) |
70°F entering water | 4.6 COP | 4.6 COP |
For SI: °C = [(°F) - 32] / 1.8, 1 British thermal unit per hour = 0.2931 W.
db = dry-bulb temperature, °F; wb = wet-bulb temperature, °F.
- IEERs and Part load rating conditions are only applicable to equipment with capacity modulation.
- Deduct 0.2 from the required EERs and IPLVs for units with a heating section other than electric resistance heat.
| EQUIPMENT TYPE | SIZE CATEGORY | MINIMUM EFFICIENCY |
| Air conditioners and heat pumps (cooling mode) |
< 7,000 Btu/h | 11.9 EER |
| 7,000 Btu/h and < 10,000 Btu/h | 11.3 EER | |
| 10,000 Btu/h and ≤13,000 Btu/h | 10.7 EER | |
| > 13,000 Btu/h | 9.5 EER |
| EQUIPMENT TYPE | SIZE CATEGORY (INPUT) |
SUBCATEGORY OR RATING CONDITION |
MINIMUM EFFICIENCY | TEST PROCEDURE |
| Warm air furnaces, gas fireda |
< 225,000 Btu/h | — | For Climate Zones 1 and 2 NR | DOE 10 CFR Part 430 or ANSI Z21.47 |
| For Climate Zones 3 and 4 90 AFUE or 90 Ect |
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| For Climate Zones 4 — 8 92 AFUE or 92 Ect |
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| ≥225,000 Btu/h | Maximum capacity | 90% Ebc | ANSI Z21.47 | |
| Warm air furnaces, oil fireda |
< 225,000 Btu/h | — | For Climate Zones 1 and 2 NR | DOE 10 CFR Part 430 or UL 727 |
| For Climate Zones 3 — 8 85 AFUE or 85 Ect |
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| ≥225,000 Btu/h | Maximum capacity | 85% Ebt | UL 727 | |
| Warm air duct furnaces, gas fireda | All capacities | Maximum capacity | 90% Ec | ANSI Z83.8 |
| Warm air unit heaters, gas fired | All capacities | Maximum capacity | 90% Ec | ANSI Z83.8 |
| Warm air unit heaters, oil fired | All capacities | Maximum capacity | 90% Ec | UL 731 |
For SI: 1 British thermal unit per hour = 0.2931 W.
Et = Thermal efficiency. Ec = Combustion efficiency (100 percent less flue losses).
- Efficient furnace fan: Fossil fuel furnaces in climate zones 3 to 8 shall have a furnace electricity ratio not greater than 2 percent and shall include a manufacturer's designation of the furnace electricity ratio.
- Units shall also include an IID (intermittent ignition device), have jacket losses not exceeding 0.75 percent 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.
- Where there are two ratings for units not covered by NAECA (3-phase power or cooling capacity greater than or equal to 65,000 Btu/h [19 kW]), units shall be permitted to comply with either rating.
| EQUIPMENT TYPE | FUEL | SIZE CATEGORY | TEST PROCEEDURE | MINIMUM EFFICIENCY |
| Steam | Gas | < 300,000 Btu/h | DOE 10 CFR Part 430 | 83% AFUE |
| > 300,000 Btu/h and > 2.5 m Btu/h | DOE 10 CFR Part 431 | 81% Et | ||
| >2.5 m Btu/h | 82% Ec | |||
| Oil | < 300,000 Btu/h | DOE 10 CFR Part 430 | 85% AFUE | |
| > 300,000 Btu/h and > 2.5 m Btu/h | DOE 10 CFR Part 431 | 83% Et | ||
| >2.5 m Btu/h | 84% Ec | |||
| Hot water | Gas | < 300,000 Btu/h | DOE 10 CFR Part 430 | 97% AFUE |
| > 300,000 Btu/h and > 2.5 m Btu/h | DOE 10 CFR Part 431 | 97% Et | ||
| >2.5 m Btu/h | 94% Ec | |||
| Oil | < 300,000 Btu/h | DOE 10 CFR Part 430 | 90% AFUE | |
| > 300,000 Btu/h and > 2.5 m Btu/h | DOE 10 CFR Part 431 | 88% Et | ||
| >2.5 m Btu/h | 87% Ec |
For SI: 1 British thermal unit per hour = 0.2931 W.
Et = Thermal efficiency. Ec= Combustion efficiency (100 percent less flue losses).
| EQUIPMENT TYPE | SIZE CATEGORY | UNITS | MINIMUM EFFICIENCYC (I-P) | Test Procedureb |
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| Path A | Path Bc | ||||||
| Full Load | IPLV | Full Load | IPLV | ||||
| Air-cooled chillers with condenser, electrically operated |
< 150 tons | EER | 10.000 | 12.500 | NA | NA | AHRI 550/ 590f |
| ≥150 tons | EER | 10.000 | 12.750 | NA | NA | ||
| Air-cooled without condenser, electrical operated |
All capacities | EER | Condenserless units shall be rated with matched con- densers |
AHRI 550 /590f |
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| Water-cooled, electrically oper- ated, positive displacement (recip- rocating) |
All capacities | kw/ton | Reciprocating units required to comply with water cooled positive displacement requirements |
AHRI 550/ 590f |
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| Water-cooled electrically oper- ated, positive displacement |
< 75 tons | kw/ton | 0.780 | 0.630 | 0.800 | 0.600 | AHRI 550/ 590f |
| ≥ 75 tons and < 150 tons | kw/ton | 0.775 | 0.615 | 0.790 | 0.586 | ||
| ≥150 tons and < 300 tons | kw/ton | 0.680 | 0.580 | 0.718 | 0.540 | ||
| ≥ 300 tons | kw/ton | 0.620 | 0.540 | 0.639 | 0.490 | ||
| Water-cooled electrically oper- ated, centrifugald |
< 150 tons | kw/ton | 0.634 | 0.596 | 0.639 | 0.450 | AHRI 550/ 590f |
| ≥150 tons and < 300 tons | kw/ton | 0.634 | 0.596 | 0.639 | 0.450 | ||
| ≥300 tons and < 600 tons | kw/ton | 0.576 | 0.549 | 0.600 | 0.400 | ||
| ≥ 600 tons | kw/ton | 0.570 | 0.539 | 0.590 | 0.400 | ||
| Air-cooled absorption single effecte |
All capacities | COP | 0.600 | NR | NA | NA | AHRI 560 |
| Water-cooled absorption single effecte |
All capacities | COP | 0.700 | NR | NA | NA | |
| Absorption double effect indirect- fired |
All capacities | COP | 1.000 | 1.050 | NA | NA | |
| Absorption double effect direct fired |
All capacities | COP | 1.000 | 1.000 | NA | NA | |
For SI: 1 Ton = 3516 W.
NA = Not applicable and cannot be used for compliance. NR = No minimum requirements.
- Compliance with this standard can be obtained by meeting the minimum requirements of Path A or Path B. However both the full load and IPLV shall be met to fulfill the requirements of Path A and Path B.
- Chapter 6 of the referenced standard contains a complete specification of the referenced test procedure, including the referenced year version of the test procedure.
- Path B is intended for applications with significant operating time at part load. All Path B machines shall be equipped with demand limiting capable controls.
- The chiller equipment requirements do not apply for chillers used in low-temperature applications where the design leaving fluid temperature is greater than 40°F.
- Only allowed to be used in heat recovery applications.
- Packages that are not designed for operation at ARI Standard 550/590 test conditions (and, thus, cannot be tested to meet the requirements of Table C-3) of 44°F leaving chilled-water temperature and 85°F entering condenser-water temperature with 3 gpm/ton condenser-water flow shall have maximum full-load kW/ton and NPLV ratings adjusted using the following equation:
Adjusted maximum full load kW/ton rating = (full load kW/ton from Table C-3)/Kadj
where:Adjusted maximum NPLV rating = (IPLV from Table C-3)/Kadj
The adjusted full load and NPLV values are only applicable over the following full-load design ranges:K adj = 6.174722 — 0.303668(X) + 0.00629466(X)2 — 0.000045780(X)3 X = DTstd+ LIFT (°F) DTstd = [(24 + (full load kW/ton from Table C-3) × 6.83)]/flow (°F) Flow = condenser-water flow (gpm) / cooling full load capacity (tons) LIFT = CEWT — CLWT (°F) CEWT = full load entering condenser-water temperature (°F) CLWT = full load leaving chilled-water temperature (°F) Minimum leaving chilled-water temperature: 38°FMaximum condenser entering water temperature: 102°FCondenser-water flow: 1 to 6 gpm/ton X≥39°F and ≤ 60°FTABLE C406.2(7)
ABSORPTION CHILLERS—EFFICIENCY REQUIREMENTSEQUIPMENT TYPE MINIMUM EFFICIENCY
FULL LOAD COP (IPLV)Air cooled, single effect 0.60, allowed only in
heat recovery applicationsWater cooled, single effect 0.70, allowed only in
heat recovery applicationsDouble effect — direct fired 1.0 (1.05 ) Double effect — indirect fired 1.20
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