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// CODE SNIPPET

C406.2 Efficient HVAC Performance

DC Energy Conservation Code 2013 > 4 [CE] Commercial Energy Efficiency > C406 Additional Efficiency Package Options > 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.
TABLE C406.2(1)
UNITARY AIR CONDITIONERS AND CONDENSING UNITS, ELECTRICALLY OPERATED, EFFICIENCY REQUIREMENTS
EQUIPMENT TYPE SIZE CATEGORY SUBCATEGORY OR
RATING CONDITION
MINIMUM EFFICIENCYa
CLIMATE ZONES
1 - 5
CLIMATE ZONES
6 - 8
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
≥ 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.
  1. IEERs are only applicable to equipment with capacity modulation.
  2. Deduct 0.2 from the required EERs and IPLVs for units with a heating section other than electric resistance heat.
TABLE C406.2(2)
UNITARY AND APPLIED HEAT PUMPS, ELECTRICALLY OPERATED, EFFICIENCY REQUIREMENTS
EQUIPMENT TYPE SIZE CATEGORY SUBCATEGORY OR RATING
CONDITION
MINIMUM EFFICIENCYa
CLIMATE ZONES
1 - 5
CLIMATE ZONES
6 - 8
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
≥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.
  1. IEERs and Part load rating conditions are only applicable to equipment with capacity modulation.
  2. Deduct 0.2 from the required EERs and IPLVs for units with a heating section other than electric resistance heat.
TABLE C406.2(3)
PACKAGED TERMINAL AIR CONDITIONERS AND PACKAGED TERMINALHEAT PUMPS
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

 

TABLE C406.2(4)
WARM AIR FURNACES AND COMBINATION WARM AIR FURNACES/AIR-CONDITIONING UNITS,  WARM AIR DUCT FURNACES AND UNIT HEATERS, EFFICIENCY REQUIREMENTS
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
For Climate Zones 4 — 8
92 AFUE or 92 Ect
≥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
≥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).
  1. 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.
  2. 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.
  3. 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.
TABLE C406.2(5)
BOILER, EFFICIENCY REQUIREMENTS
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).
TABLE C406.2(6)
CHILLERS—EFFICIENCY REQUIREMENTS
EQUIPMENT TYPE SIZE CATEGORY UNITS MINIMUM EFFICIENCYC (I-P) Test
Procedureb
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
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
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.
  1. 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.
  2. Chapter 6 of the referenced standard contains a complete specification of the referenced test procedure, including the referenced year version of the test procedure.
  3. 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.
  4. 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.
  5. Only allowed to be used in heat recovery applications.
  6. 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
    Adjusted maximum NPLV rating = (IPLV from Table C-3)/Kadj
    where:
    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)
    The adjusted full load and NPLV values are only applicable over the following full-load design ranges:
    Minimum leaving chilled-water temperature: 38°F
    Maximum condenser entering water temperature: 102°F
    Condenser-water flow: 1 to 6 gpm/ton X≥39°F and ≤ 60°F

     

    TABLE C406.2(7)
    ABSORPTION CHILLERS—EFFICIENCY REQUIREMENTS
    EQUIPMENT TYPE MINIMUM EFFICIENCY
    FULL LOAD COP (IPLV)
    Air cooled, single effect 0.60, allowed only in
    heat recovery applications
    Water cooled, single effect 0.70, allowed only in
    heat recovery applications
    Double effect — direct fired 1.0 (1.05 )
    Double effect — indirect fired 1.20

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