Appendix A to Subpart F of Part 431 - —Uniform Test Method for the Measurement of Energy Consumption of Commercial Package Air Conditioning and Heating Equipment (Excluding Air-Cooled Equipment With a Cooling Capacity Less Than 65,000 Btu/h)

Appendix A to Subpart F of Part 431—Uniform Test Method for the Measurement of Energy Consumption of Commercial Package Air -Cooled Small (≥65Conditioning and Heating Equipment (Excluding Air-Cooled Equipment With a Cooling Capacity Less Than 65,000 Btu/h) , Large, and Very Large Commercial Package Air Conditioning and Heating Equipment

Cross Reference

Link to an amendment published at 89 FR 44046, May 20, 2024.

Note:

Prior to

December 19

May 15,

2016

2025, representations with respect to the energy use or efficiency of

air-cooled small, large, and very large

commercial package air conditioning and heating equipment (excluding air-cooled equipment with a cooling capacity less than 65,000 Btu/h), including compliance certifications, must be based on testing conducted in accordance with

either Table 1 to § 431.96 as it now appears or Table

:

(a) The applicable provisions (appendix A to subpart F of part 431 for air-cooled equipment, and table 1 to § 431.96

as it

for water-cooled and evaporatively-cooled equipment) as they appeared in subpart F of

this

10 CFR part

, in the 10 CFR parts 200 through 499 edition

431, revised as of January 1,

2015. After December 19, 2016,

2024; or

(b) This appendix.

Beginning May 15, 2025, and prior to the compliance date of amended standards for commercial package air conditioning and heating equipment (excluding air-cooled equipment with a cooling capacity less than 65,000 Btu/h) based on integrated ventilation, economizing, and cooling (IVEC) and integrated ventilation and heating efficiency (IVHE) (see § 431.97), representations with respect to energy use or efficiency of commercial package air conditioning and heating equipment (excluding air-cooled

small, large, and very large

equipment with a cooling capacity less than 65,000 Btu/h), including compliance certifications, must be based on testing conducted in accordance with this appendix.

Beginning on the compliance date of amended standards for commercial package air conditioning and heating equipment (excluding equipment with a cooling capacity less than 65,000 Btu/h) based on IVEC and IVHE (see § 431.97), representations with respect to energy use or efficiency of commercial package air conditioning and heating equipment (excluding air-cooled equipment with a cooling capacity less than 65,000 Btu/h), including compliance certifications, must be based on testing conducted in accordance with

Table 1 to § 431.96 as it now appears.(1) Cooling mode test method. The test method for cooling mode consists of the methods and conditions in AHRI 340/360-2007 sections 3, 4, and 6 (omitting section 6.3) (incorporated by reference; see § 431.95), and in ANSI/ASHRAE 37-2009 (incorporated by reference; see § 431.95). In case of a conflict between AHRI 340/360-2007 or

appendix A1 to this subpart.

Manufacturers may also certify compliance with any amended energy conservation standards for commercial package air conditioning and heating equipment (excluding air-cooled equipment with a cooling capacity less than 65,000 Btu/h) based on IVEC or IVHE prior to the applicable compliance date for those standards (see § 431.97), and those compliance certifications must be based on testing in accordance with appendix A1 to this subpart.

1. Incorporation by Reference

DOE incorporated by reference in § 431.95, the entire standard for AHRI 340/360-2022 and ANSI/ASHRAE 37-2009

and the CFR, the CFR provisions control.(2) Heating mode test method. The test method for heating mode consists of the methods and conditions in

. However, certain enumerated provisions of AHRI 340/360-

2007 sections 3, 4, and 6 (omitting section 6.3) (incorporated by reference; see § 431.95), and in

2022 and ANSI/ASHRAE 37-2009

(incorporated by reference; see § 431.95). In case of a conflict between AHRI 340/360-2007 or ANSI/ASHRAE 37-2009

, as set forth in this section 1 are inapplicable. To the extent there is a conflict between the terms or provisions of a referenced industry standard and the CFR, the CFR provisions control.

(3) Minimum external static pressure. Use the certified cooling capacity for the basic model to choose the minimum external static pressure found in table 5 of section 6 of

1.1. AHRI 340/360-

2007 (incorporated by reference; see § 431.95) for testing.

(4) Optional break-in period. Manufacturers may optionally specify a “break-in” period, not to exceed 20 hours, to operate the equipment under test prior to conducting the test method in appendix A of this part. A manufacturer who elects to use an optional compressor break-in period in its certification testing must record this information (including the duration) as part of the information in the supplemental testing instructions under 10 CFR 429.43.

(5) Additional provisions for equipment set-up. The only additional specifications that may be used in setting up a unit for test are those set forth in the installation and operation manual shipped with the unit. Each unit should be set up for test in accordance with the manufacturer installation and operation manuals. Paragraphs (5)(i) through (ii) of this section provide specifications for addressing key information typically found in the installation and operation manuals.

(i) If a manufacturer specifies a range of superheat, sub-cooling, and/or refrigerant pressure in its installation and operation manual for a given basic model, any value(s) within that range may be used to determine refrigerant charge or mass of refrigerant, unless the manufacturer clearly specifies a rating value in its installation and operation manual, in which case the specified rating value shall be used.

(ii) The airflow rate used for testing must be that set forth in the installation and operation manuals being shipped to the customer with the basic model and clearly identified as that used to generate the DOE performance ratings. If a certified airflow value for testing is not clearly identified, a value of 400 standard cubic feet per minute (scfm) per ton shall be used.

(6) Indoor airflow testing and adjustment.

(i) When testing full-capacity cooling operation at the required external static pressure condition, the full-load indoor airflow rate must be within ± 3 percent of the certified-rated airflow at full-capacity cooling operation. If the indoor airflow rate at the required minimum external pressure is outside the ± 3-percent tolerance, the unit and/or test setup must be adjusted such that both the airflow and ESP are within the required tolerances. This process may include, but is not limited to, adjusting any adjustable motor sheaves, adjusting variable drive settings, or adjusting the code tester fan.

(ii) When testing other than full-capacity cooling operation using the full-load indoor airflow rate (e.g., full-load heating), the full-load indoor airflow rate must be within ± 3 percent of the certified-rated full-load cooling airflow (without regard to the resulting external static pressure), unless the unit is designed to operate at a different airflow for cooling and heating mode. If necessary, a test facility setup may be made in order to maintain airflow within the required tolerance; however, no adjustments to the unit under test may be made.

(7) Condenser head pressure controls. Condenser head pressure controls, if typically shipped with units of the basic model by the manufacturer or available as an option to the basic model, must be active during testing.

(8) Standard CFM. In the referenced sections of AHRI 340/360-2007 (incorporated by reference; see § 431.95), all instances of CFM refer to standard CFM (SCFM). Likewise, all references to airflow or air quantity refer to standard airflow and standard air quantity.

(9) Capacity rating at part-load. When testing to determine EER for the part-load rating points (i.e. 75-percent load, 50-percent load, and 25-percent load), if the measured capacity expressed as a percent of full-load capacity for a given part-load test is within three percent above or below the target part-load percentage, the EER calculated for the test may be used without any interpolation to determine IEER.

(10) Condenser air inlet temperature for part-load testing. When testing to determine EER for the part-load rating points (i.e. 75-percent load, 50-percent load, and 25-percent load), the condenser air inlet temperature shall be calculated (using the equation in Table 6 of AHRI 340/360-2007; incorporated by reference; see § 431.95) for the target percent load rather than for the percent load measured in the test. Table 1 of this appendix shows the condenser air inlet temperature corresponding with each target percent load, as calculated using the equation

2022:

(a) Section 1 Purpose is inapplicable,

(b) Section 2 Scope is inapplicable,

(c) The following subsections of Section 3 Definitions are inapplicable: 3.2 (Basic Model), 3.4 (Commercial and Industrial Unitary Air-conditioning Equipment), 3.5 (Commercial and Industrial Unitary Heat Pump), 3.7 (Double-duct System), 3.8 (Energy Efficiency Ratio (EER)), 3.12 (Heating Coefficient of Performance (COP_H)), 3.14 (Integrated Energy Efficiency Ratio (IEER)), 3.23 (Published Rating), 3.26 (Single Package Air-Conditioners), 3.27 (Single Package Heat Pumps), 3.29 (Split System Air-conditioners), 3.30 (Split System Heat Pump), 3.36 (Year Round Single Package Air-conditioners),

(d) Section 7 Minimum Data Requirements for Published Ratings is inapplicable,

(e) Section 8 Operating Requirements is inapplicable,

(f) Section 9 Marking and Nameplate Data is inapplicable,

(g) Section 10 Conformance Conditions is inapplicable,

(h) Appendix B References—Informative is inapplicable,

(i) Appendix D Unit Configuration for Standard Efficiency Determination—Normative is inapplicable,

(j) Appendix F International Rating Conditions—Normative is inapplicable,

(k) Appendix G Examples of IEER Calculations—Informative is inapplicable,

(l) Appendix H Example of Determination of Fan and Motor Efficiency for Non-standard Integrated Indoor Fan and Motors—Informative is inapplicable, and

(m) Appendix I Double-duct System Efficiency Metrics with Non-Zero Outdoor Air External Static Pressure (ESP)—Normative is inapplicable.

1.2. ANSI/ASHRAE 37-2009:

(a) Section 1 Purpose is inapplicable

(b) Section 2 Scope is inapplicable, and

(c) Section 4 Classifications is inapplicable.

2. General

Determine the applicable energy efficiency metrics (IEER, EER, and COP) in accordance with this appendix and the applicable sections of AHRI 340/360-2022 and ANSI/ASHRAE 37-2009.

Section 3 of this appendix provides additional instructions for testing. In cases where there is a conflict, the language of this appendix takes highest precedence, followed by AHRI 340/360-2022, followed by ANSI/ASHRAE 37-2009. Any subsequent amendment to a referenced document by the standard-setting organization will not affect the test procedure in this appendix, unless and until the test procedure is amended by DOE.

3. Test Conditions

The following conditions specified in Table 6 of AHRI 340/360-2022 apply when testing to certify to the energy conservation standards in § 431.97. For cooling mode tests for equipment subject to standards in terms of EER, test using the “Standard Rating Conditions Cooling”. For cooling mode tests for equipment subject to standards in terms of IEER, test using the “Standard Rating Conditions Cooling” and the “Standard Rating Part-Load Conditions (IEER)”. For heat pump heating mode tests for equipment subject to standards in terms of COP, test using the “Standard Rating Conditions (High Temperature Steady State Heating)”.

For equipment subject to standards in terms of EER, representations of IEER made using the “Standard Rating Part-Load Conditions (IEER)” in Table 6 of AHRI 340/360-2022 are optional. For equipment subject to standards in terms of IEER, representations of EER made using the “Standard Rating Conditions Cooling” in Table 6 of AHRI 340/360-

2007.

Table 1 to Appendix A to Subpart F of Part 431—Condenser Air Inlet Temperatures for Part-Load Tests

Target percent load (%) Condenser air inlet temperature ( °F) 2565 5068 7581.5[80 FR 79670, Dec. 23, 2015

2022 are optional. Representations of COP made using the “Standard Rating Conditions (Low Temperature Steady State Heating)” in Table 6 of AHRI 340/360-2022 are optional and are not to be used as the basis for determining compliance with energy efficiency standards in terms of COP.

[89 FR 44046, May 20, 2024]