R-402A, R-402B, R-403A, R-403B, R-404A, R-405A, R-406A, R-407A, R-407B, R-407C, R-407D, R-407E, R-407F, R-408A, R-409A, R-409B, R-410A, R-410B, R-411A, R-411B, R-412A, R-413A, R-414A, R-414B, R-415A, R-415B, R-416A, R-417A, R-417B, R-417C, R-418A, R-419A, R-419B, R-420A, R-421A, R-421B, R-422A, R-422B, R-422C, R-422D, R-422E, R-423A, R-424A, R-425A, R-426A, R-427A, R-428A, R-429A, R-430A, R-431A, R-434A, R-435A, R-437A, R-438A, R-439A, R-440A, R-442A, R-444A, R-444B, R-445A, R-446A, R-447A, R-448A, R-449A, R-450A;
2.1.5 Zeotropic Hydrocarbon Blend Refrigerants: R-432A, R-433A, R-433B, R-433C, R-436A, R-436B, R-441A, R-443A; and
2.1.6 Azeotropic Blend Refrigerants: R-500, R-502, R-503, R-507A, R-508A, R-508B, R-509A, R-510A, R-511A, and R-512A.
Section 3. Definitions
3.1 Definitions. All terms in this appendix will follow the definitions in § 82.152 unless otherwise defined in this appendix.
3.2 Shall, Should, Recommended, or It Is Recommended shall be interpreted as follows:
3.2.1 Shall. Where "shall" or "shall not" is used for a provision specified, that provision is mandatory if compliance with this appendix is claimed.
3.2.2 Should, Recommended, or It is Recommended is used to indicate provisions which are not mandatory but which are desirable as good practice.
Section 4. Characterization of Refrigerants and Contaminants
4.1 Characterization. Characterization of single component fluorocarbon (Table 1A) and zeotropic/azeotropic blend (Table 2A/3) refrigerants and contaminants are listed in the following general classifications:
4.1.1 Isomer content (see Table 1A)
4.1.2 Air and other non-condensables (see Tables 1A, 2A, 3)
4.1.3 Water (see Tables 1A, 2A, 3)
4.1.4 All other volatile impurities (see Tables 1A, 2A, 3)
4.1.5 High boiling residue (see Tables 1A, 2A, 3)
4.1.6 Halogenated unsaturated volatile impurities (see Table 1A)
4.1.7 Particulates/solids (see Tables 1A, 2A, 3)
4.1.8 Acidity (see Tables 1A, 2A, 3)
4.1.9 Chloride (see Tables 1A, 2A, 3)
4.2 Hydrocarbon Characterization. Characterization of hydrocarbon refrigerants (Tables 1B and 2B) and contaminants are listed in the following general classifications:
4.2.1 Nominal composition
4.2.2 Other allowable impurities
4.2.3 Air and other non-condensables
4.2.4 Sulfur odor
4.2.5 High boiling residue
4.2.6 Particulates/solids
4.2.7 Acidity
4.2.8 Water
4.2.9 All other volatile impurities
4.2.10 Total C3, C4, and C5 polyolefins
4.3 Carbon Dioxide Characterization. Characterization of carbon dioxide (Table 1C) and its contaminants are listed in the following general classifications:
4.3.1 Purity
4.3.2 Air and other non-condensables
4.3.3 Water
4.3.4 High boiling residue
4.3.5 Particulates/solids
Section 5. Sampling and Summary of Test Procedures
5.1 Referee Test. The referee test methods for the various contaminants are summarized in the following paragraphs. Detailed test procedures are included in 2008 Appendix C to AHRI Standard 700-2014 (incorporated by reference, see § 82.168). If alternative test methods are employed, the user must be able to demonstrate that they produce results at least equivalent to the specified referee test method.
5.2 Refrigerant Sampling
5.2.1 Sampling Precautions. Special precautions should be taken to ensure that representative samples are obtained for analysis. Sampling shall be done by qualified personnel following accepted sampling and safety procedures. Refrigerants with critical temperatures near or below ambient temperature cannot be reliably sampled for both liquid and vapor phase without special handling.
Note: Flammable refrigerants which