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Federal Register / Vol. 86, No. 86 / Thursday, May 6, 2021 / Rules and Regulations
3. Add appendix W to subpart G of part 82 to read as follows:

Appendix W to Subpart G of Part 82
Substitutes Listed in the May 6, 2021
Final RuleEffective June 7, 2021

REFRIGERANTSSUBSTITUTES ACCEPTABLE SUBJECT TO NARROWED USE LIMITS
End-use
Substitute
Retail food refrigeration mediumtemperature stand-alone units new only.

R448A, R449A, R449B.

Decision
Narrowed use limits
Further information
Acceptable Subject to Narrowed Use Limits.

Acceptable only for use in new medium-temperature stand-alone units where reasonable efforts have been made to ascertain that other alternatives are not technically feasible.
Users are required to document and retain the results of their technical investigation of alternatives for the purpose of demonstrating compliance.
Information shall include descriptions of:
Process or product in which the substitute is needed;
Substitutes examined and rejected;
Reason for rejection of other alternatives, e.g., performance, technical or safety standards; and Anticipated date other substitutes will be available and projected time for switching.

A possible reason for rejection of one or more other alternatives could be based on ADA
requirements.

REFRIGERANTSSUBSTITUTES ACCEPTABLE SUBJECT TO USE CONDITIONS
End-use
Substitute
khammond on DSKJM1Z7X2PROD with RULES2

Residential and light commercial air conditioning and heat pumps new only.

VerDate Sep<11>2014

R452B, R454A, R
454B, R454C and R457A.

18:29 May 05, 2021

Decision
Use conditions
Further information
Acceptable Subject to Use Conditions.

These refrigerants may be used only in new equipment specifically designed and clearly identified for the refrigerants i.e., none of these substitutes may be used as a conversion or retrofit refrigerant for existing equipment designed for other refrigerants.
These substitutes may only be used in air conditioning equipment that meets all requirements in the 3rd edition of UL 60335240. 1 2 3 In cases where this appendix includes requirements more stringent than those of UL 60335240, the appliance must meet the requirements of this appendix in place of the requirements in the UL Standard.
The charge size for the equipment must not exceed the maximum refrigerant mass determined according to UL
60335240 for the room size where the air conditioner is used.
The following markings must be attached at the locations provided and must be permanent:
a On the outside of the air conditioning equipment:
WARNINGRisk of Fire. Flammable Refrigerant Used. To Be Repaired Only By Trained Service Personnel. Do Not Puncture Refrigerant Tubing.
b On the outside of the air conditioning equipment:
WARNINGRisk of Fire. Dispose of Properly In Accordance With Federal Or Local Regulations.
Flammable Refrigerant Used.
c On the inside of the air conditioning equipment near the compressor: WARNINGRisk of Fire.
Flammable Refrigerant Used. Consult Repair Manual/Owners Guide Before Attempting To Service This Product. All Safety Precautions Must be Followed.
d For any equipment pre-charged at the factory, on the equipment packaging: WARNINGRisk of Fire due to Flammable Refrigerant Used. Follow Handling Instructions Carefully in Compliance with National Regulations.
e On the indoor unit near the nameplate:
a. At the top of the marking: Minimum Installation height, X m W ft. This marking is only required if required by UL 60335240. The terms X and W shall be replaced by the numeric height as calculated per the UL
Standard. Note that the formatting here is slightly different than the UL Standard; specifically, the height in Inch-Pound units is placed in parentheses and the word and has been replaced by the opening parenthesis.
b. Immediately below a above or at the top of the marking if a is not required: Minimum room area operating or storage, Y m2 Z
ft2. The terms Y and Z shall be replaced by the numeric area as calculated per the UL
Standard. Note that the formatting here is slightly different than the UL Standard; specifically, the area in Inch-Pound units is placed in parentheses and the word and has been replaced by the opening parenthesis.

Applicable OSHA requirements at 29 CFR part 1910
must be followed, including those at 29 CFR 1910.94
ventilation and 1910.106 flammable and combustible liquids, 1910.110 storage and handling of liquefied petroleum gases, and 1910.1000 toxic and hazardous substances.
Proper ventilation should be maintained at all times during the manufacture and storage of equipment containing flammable refrigerants through adherence to good manufacturing practices as per 29 CFR
1910.106. If refrigerant levels in the air surrounding the equipment rise above one-fourth of the lower flammability limit, the space should be evacuated and reentry should occur only after the space has been properly ventilated.

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Technicians and equipment manufacturers should wear appropriate personal protective equipment, including chemical goggles and protective gloves, when handling flammable refrigerants. Special care should be taken to avoid contact with the skin which, like many refrigerants, can cause freeze burns on the skin.
A class B dry powder type fire extinguisher should be kept nearby.
Technicians should only use spark-proof tools when working on air conditioning equipment with flammable refrigerants.
Any recovery equipment used should be designed for flammable refrigerants. Only technicians specifically trained in handling flammable refrigerants should service refrigeration equipment containing these refrigerants. Technicians should gain an understanding of minimizing the risk of fire and the steps to use flammable refrigerants safely.
Room occupants should evacuate the space immediately following the accidental release of this refrigerant.
Personnel commissioning, maintaining, repairing, decommissioning and disposing of appliances with these refrigerants should obtain training and follow practices consistent with Annex HH of UL 60335240, 3rd edition.1 2 3
CAA section 608c2 prohibits knowingly venting or otherwise knowingly releasing or disposing of substitute refrigerants in the course of maintaining, servicing, repairing or disposing of an appliance or industrial process refrigeration.
Department of Transportation requirements for transport of flammable gases must be followed.
Flammable refrigerants being recovered or otherwise disposed of from residential and light commercial air conditioning appliances are likely to be hazardous waste under the Resource Conservation and Recovery Act RCRA see 40 CFR parts 260270.

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