Section 429.53 - [Effective 12/23/2024] Walk-in coolers and walk-in freezers(a)Determination of represented value.(1) The requirements of § 429.11 apply to walk-in coolers and walk-in freezers; and(2) For each basic model of walk-in cooler and walk-in freezer refrigeration system, the annual walk-in energy factor (AWEF) must be determined either by testing, in accordance with § 431.304 of this chapter and the provisions of this section, or by application of an AEDM that meets the requirements of § 429.70 and the provisions of this section.(i)Applicable test procedure. If AWEF or AWEF2 is determined by testing, test according to the applicable provisions of § 431.304(b) of this chapter with the following equipment-specific provisions. (A)Dedicated condensing units. Outdoor dedicated condensing refrigeration systems that are also designated for use in indoor applications must be tested and rated as both an outdoor dedicated condensing refrigeration system and an indoor dedicated refrigeration system.(B)Matched refrigeration systems. A matched refrigeration system is not required to be rated if the constituent unit cooler(s) and dedicated condensing unit have been tested as specified in § 431.304(b)(4) of this chapter. However, if a manufacturer wishes to represent the efficiency of the matched refrigeration system as distinct from the efficiency of either constituent component, or if the manufacturer cannot rate one or both of the constituent components using the specified method, the manufacturer must test and rate the matched refrigeration system as specified in § 431.304(b)(4) of this chapter.(C)Detachable single-packaged dedicated systems. Detachable single-packaged dedicated systems must be tested and rated as a single-packaged dedicated systems using the test procedure in § 431.304(b)(4) of this chapter.(D)Attached split systems. Attached split systems must be tested and rated as dedicated condensing units and unit coolers using the test procedure in § 431.304(b)(4) of this chapter. (ii)Units to be tested.(A) If the represented value for a given refrigeration system basic model is determined through testing, the general requirements of § 429.11 apply; and(B) For each basic model, a sample of sufficient size shall be randomly selected and tested to ensure that any represented value of AWEF or other measure of energy efficiency of a basic model for which consumers would favor higher values shall be less than or equal to the lower of:(1) The mean of the sample, where: View Image
And x is the sample mean; n is the number of samples; and xi is the ith sample, or,
(2) The lower 95 percent confidence limit (LCL) of the true mean divided by 0.95, where: View Image
And x is the sample mean; s is the sample standard deviation; n is the number of samples; and t0.95 is the t statistic for a 95% one-tailed confidence interval with n-1 degrees of freedom (from appendix A to subpart B).
(C) The represented value of net capacity shall be the average of the capacities measured for the sample selected.(iii)Alternative efficiency determination methods. In lieu of testing, pursuant to the requirements of § 429.70 and the provisions of this section, a represented value of AWEF for a basic model of a walk-in cooler or walk-in freezer refrigeration system may be determined through the application of an AEDM, where:(A) Any represented value of AWEF or other measure of energy efficiency of a basic model for which consumers would favor higher values shall be less than or equal to the output of the AEDM and greater than or equal to the Federal standard for that basic model.(B) The represented value of net capacity must be the net capacity simulated by the AEDM.(3) For each basic model of walk-in cooler and walk-in freezer display and non-display door, the daily energy consumption must be determined by testing, in accordance with § 431.304 of this chapter and the provisions of this section, or by application of an AEDM that meets the requirements of § 429.70 and the provisions of this section. (i)Applicable test procedure. Prior to October 31, 2023 use the test procedure for walk-ins in 10 CFR part 431, subpart R, appendix A, revised as of January 1, 2022, to determine daily energy consumption. Beginning October 31, 2023, use the test procedure in part 431, subpart R, appendix A of this chapter to determine daily energy consumption.(ii)Units to be tested. For each basic model, a sample of sufficient size shall be randomly selected and tested to ensure that any represented value of daily energy consumption of a basic model or other measure of energy use for which consumers would favor lower values shall be greater than or equal to the higher of: (A) The mean of the sample, where: Equation 3 to Paragraph (a)(3)(ii)(A)
View Image
And x is the sample mean, n is the number of samples, and x i is the ith sample; or,
(B) The upper 95 percent confidence limit (UCL) of the true mean divided by 1.05, where: Equation 4 to Paragraph (a)(3)(ii)(B)
View Image
And x is the sample mean, s is the sample standard deviation; n is the number of samples, and t-0.95 is the statistic for a 95 percent one-tailed confidence interval with n-1 degrees of freedom (from appendix A to this subpart).
(4) For each basic model of walk-in cooler and walk-in freezer panel and non-display door, the R-value must be determined by testing, in accordance with § 431.304 of this chapter and the provisions of this section.(i)Applicable test procedure. Prior to October 31, 2023, use the test procedure for walk-ins in 10 CFR part 431, subpart R, appendix B, revised as of January 1, 2022, to determine R-value. Beginning October 31, 2023, use the test procedure in appendix B to subpart R of part 431 of this chapter to determine R-value.(ii)Units to be tested. For each basic model, a sample of sufficient size shall be randomly selected and tested to ensure that any represented value of R-value or other measure of efficiency of a basic model for which consumers would favor higher values shall be less than or equal to the lower of:(A) The mean of the sample, where: Equation 5 to Paragraph (a)(4)(ii)(A)
View Image
And x is the sample mean, n is the number of samples, and xi is the ith sample; or,
(B) The lower 95 percent confidence limit (LCL) of the true mean divided by 0.95, where: Equation 6 to Paragraph (a)(4)(ii)(B)
View Image
And x is the sample mean, s is the sample standard deviation; n is the number of samples, and t-0.95 is the statistic for a 95 percent one-tailed confidence interval with n-1 degree of freedom (from appendix A to this subpart).
(b)Certification reports.(1) The requirements of § 429.12 apply to manufacturers of walk-in cooler and walk-in freezer panels, doors, and refrigeration systems, and;(2) Pursuant to § 429.12(b)(13) , a certification report must include the following public product-specific information:(i) For display and non-display doors:(B) R-value of the door insulation (as applicable);(C) A declaration that the manufacturer has incorporated the applicable design requirements;(D) For transparent reach-in display doors and windows, the glass type of the doors and windows (e.g., double-pane with heat reflective treatment, triple-pane glass with gas fill);(E) Power draw of the anti-sweat heater in watts per square foot of door opening;(F) Door energy consumption in kilowatt-hours per day;(G) Rated surface area in square feet; and(H) For doors with anti-sweat heater controls, the range of temperature conditions (in degrees Fahrenheit) and/or relative humidity conditions (in percent, %) at which the anti-sweat heater turns on.(ii) For panels: The R-value of the insulation.(iii) For refrigeration systems:(A) The installed motor's functional purpose (i.e., evaporator fan motor or condenser fan motor), its rated horsepower, and a declaration that the manufacturer has incorporated the applicable walk-in-specific design requirements into the motor;(B) The refrigeration system AWEF and net capacity in BTU/h;(C) The configuration tested for certification (e.g., condensing unit only, unit cooler only, single-packaged dedicated system matched-pair, attached split-system, or detachable single-packaged system);(D) Whether an indoor dedicated condensing unit is also certified as an outdoor dedicated condensing unit and, if so, the basic model number for the outdoor dedicated condensing unit; and(E) Whether the certified basic model meets the definition of a CO2 unit cooler.(3) Pursuant to § 429.12(b)(13) , a certification report must include the following non-public product-specific information in addition to the information listed in paragraph (b)(2) of this section:(i)For display and non-display doors:(A) The rated power of each light, heater wire, and/or other electricity consuming device associated with each basic model of display and non-display door; and whether such device(s) has a timer, control system, or other demand-based control reducing the device's power consumption; and(B) The conduction load through the door in Btu/h.(ii)For refrigeration systems:(A) Whether the dedicated condensing system using flooded head pressure controls; and(B) The compressor break-in period, if used.(4) Pursuant to § 429.12(b)(13) , a certification report must include supplemental information submitted in PDF format. The equipment-specific supplemental information must be consistent with the equipment's installation or operating instructions; include any additional testing and testing set up instructions (e.g., charging instructions) for the basic model; identify all special features that were included in rating the basic model; and include all other information (e.g., any specific settings or controls) necessary to operate the basic model under the required conditions specified by the relevant test procedure. A manufacturer may also include with a certification report other supplementary items in PDF format (e.g., operating manuals and/or installation instructions) for DOE to consider when performing testing under appendix C and appendix C1 to subpart R of part 431. 81 FR 95799 , Dec. 28, 2016, as amended at 88 FR 28835 , May 4, 2023 81 FR 95799 , 1/27/2017; 88 FR 28835 , 6/5/2023; 89 FR 82067 , 12/23/2024