ASHRAE Standard 15.2 2022

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ASHRAE Standard 15.2-2022 — Safety Standard for Refrigeration Systems in Residential Applications (ANSI Approved)

Published By	Publication Date	Number of Pages
ASHRAE	2022	40

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Category: ASHRAE

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Description

Newly published ASHRAE Standard 15.2 is a safety standard designed to accommodate the use of A2L-classified refrigerants in low-rise residential applications and is intended for use by manufacturers, installers, contractors, service technicians, building code officials, and others. Historically, safety requirements were not applied as rigorously to residential HVAC systems as they are to commercial systems, primarily because direct systems were restricted to ASHRAE Standard 34 A1-classified refrigerants and listed to safety design standards such as UL 1995 and UL 60335-2-40, and because the risk of reaching and exceeding a refrigerant’s acute toxicity exposure limit (ATEL) in the event of a complete release was very low. Standard 15.2 requires that all products be listed to a national product safety standard and installed per the manufacturer’s installation instructions. Specific requirements are included for which refrigerants can be used, the maximum allowable refrigerant charge, accessories, and interconnecting piping, so that in the event of a full release of the refrigerant charge, the concentration in the space remains safely below the lower flammability limit of the refrigerant.

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PDF Pages	PDF Title
1	ANSI/ASHRAE Standard 15.2-2022
3	Contents
4	Foreword 1. Purpose 2.* Scope 2.1 This standard applies to listed direct refrigeration systems in the following residential applications that are limited to serving only a single dwelling unit or sleeping unit: 3. Administrative 3.1 Precedence with Conflicting Requirements. Where there is a conflict between this standard and local building, electrical, fire, mechanical, or other adopted codes, the provisions of the local or adopted code shall take precedence unless otherwise…
5	3.2 Alternative Materials, Methods, Equipment, and Appliances. The provisions of this standard are not intended to prevent the installation of any material or to prohibit any method of construction not specifically prescribed by this standard, provid… 3.3 New Technologies. Nothing in this standard shall be construed as a restriction on new technologies or alternative methods, provided that the level of safety as herein described is not reduced and is acceptable to the authority having jurisdiction. 4. Definitions
8	5. General Requirements 5.1* Equipment Requirements. Refrigeration systems using A2L refrigerants shall be listed and labeled to UL 60335-2-40/CSA-C22.2 No. 60335-2-40-19 2 or UL 484/CSA 22.2 No. 117 3. Refrigeration systems using A1 refrigerants shall be listed to UL 60335… 5.2 Manufacturer’s Installation Instructions. All refrigeration systems shall be installed in accordance with the manufacturer’s installation instructions. After installation, the manufacturer’s installation instructions, owner’s manuals, ser… 5.3* Manufacturer’s Refrigerant Detection System Requirements. Refrigeration systems using an A2L refrigerant with more than m1 refrigerant charge shall have an integral refrigerant detection system unless the system complies with one of the following
9	5.4 Field-Installed Accessory Requirements. All field-installed accessories shall be installed in accordance with the accessory and equipment manufacturer’s installation instructions. Accessories installed in the ductwork of A2L refrigeration syste… 5.5 Signs and Identification. Each refrigeration system shall have the following information legibly and permanently indicated on a markable label provided by the equipment manufacturer: 6. Refrigerant Classification and Requirements 6.1* Permissible Refrigerants. Only refrigerants having an approved refrigerant designation of ASHRAE Standard 34 1 safety group A1 or A2L shall be used in conjunction with this standard. 6.2 Refrigerant Requirements 7. Location of Refrigeration Systems and Restrictions 7.1 General. Refrigeration systems shall be located in accordance with the manufacturer’s installation instructions. 8. Piping Requirements 8.1 General. Refrigerant piping, valves, and fittings shall comply with Sections 8.2 through 8.5. 8.2 Materials. Materials used in the construction and installation of refrigeration systems shall be suitable for conveying the refrigerant used. Materials that will deteriorate due to the refrigerant or lubricant in the presence of air or moisture s… 8.3 Refrigerant Piping, Valves, Fittings, and Related Parts. Refrigerant piping, valves, fittings, and related parts, whether new or reused on an existing refrigeration system that is being renovated or modified, shall comply with Sections 8.3.1 thro…
10	8.4 Joints and Connections 8.5 Refrigerant Pipe Installation
11	Table 8-1 Refrigerant Pipe Table 8-2 Refrigerant Pipe Fittings Table 8-3 Copper Brazed Swaged Cup Depths Table 8-4 Allowable Joints
12	Table 8-5 Pipe Hanger Spacing
13	Table 8-6 Shaft Ventilation Velocity 9. Refrigerant Charge Limits 9.1 Charge Limit Compliance. Charge limits for residential refrigeration systems shall follow a compliance path as shown in Figure 9-1. 9.2 Maximum Allowable Refrigerant Charge for A1 Refrigerants. The maximum refrigerant charge (mmax) of A1 refrigerants permissible in a space shall be limited such that the RCL in ASHRAE Standard 34 1, Table 4-1 or Table 4-2 shall not be exceeded in … 9.3* Flammable A2L Refrigerant Charge Levels for Mitigation. Charge levels used to determine mitigation requirements for A2L refrigerants are shown in Table 9-1. 9.4 Dispersal Volume Determinations. The dispersal volume used to determine the maximum refrigerant charge (mmax) shall be determined by multiplying the dispersal floor area and dispersal height as determined per the requirements of Sections 9.4.2 an…
14	Figure 9-1 Charge limit compliance flow path.
15	9.5* Maximum Allowable Refrigerant Charge. The maximum refrigerant charge (mmax) allowed for the dispersal volume identified using Section 9.4 shall be determined as follows. Table 9-1 Flammable A2L Refrigerant Charge Levels for Mitigation
16	9.6* Releasable Charge (mrel). Releasable charge (mrel) shall be determined as shown in the following subsections. Table 9-2 LFL Conversion Factor 10. System Installation 10.1 General 10.2 Security. All refrigerant circuit service ports shall require a tool for access directly on the service port or within a service panel.
17	Table 9-3 M for A2L Systems Based on 7.2 ft (2.2 m) Space Height a
18	Table 9-4 Additional Charge Permitted for A2L Systems Using Ventilation Table 9-5 mrel Equations for Systems Using Safety Shut-Off Valves in Heating Mode
19	Table 9-6 MLH: Refrigerant Liquid Contained in Liquid Interconnecting Tubing from Safety Shut-Off Valves to Each Indoor Section in Heating Mode
20	Table 9-7 MGH: Refrigerant Vapor Contained in Vapor Interconnecting Tubing from Safety Shut-Off Valves to Each Indoor Section in Heating Mode
21	Table 9-8 MUH: Refrigerant Contained in Indoor Section in Heating Mode Table 9-9 mrel Equations for Systems Using Safety Shut-Off Valves in Cooling Mode
22	Table 9-10 MLC: Refrigerant Liquid Contained in Liquid Interconnecting Tubing from Safety Shut-Off Valves to Each Indoor Section in Cooling Mode
23	Table 9-11 MGC: Refrigerant Vapor Contained in Vapor Interconnecting Tubing from Safety Shut-Off Valves to Each Indoor Section in Cooling Mode
24	Table 9-12 MUC: Refrigerant Contained in Indoor Section in Cooling Mode Table 9-13 mrel Equations for Systems Using Safety Shut-Off Valves in Off/Standby Mode
25	Table 9-14 MLS: Refrigerant Liquid Contained in Liquid Interconnecting Tubing from Safety Shut-Off Valves to Each Indoor Section in Off/Standby Mode
26	Table 9-15 MGS: Refrigerant Vapor Contained in Vapor Interconnecting Tubing from Safety Shut-Off Valves to Each Indoor Section in Off/Standby Mode
27	Table 9-16 MUS: Refrigerant Contained in Indoor Section in Off/Standby Mode 10.3 Refrigerant Pressure Measuring Instruments. Pressure measuring instruments used during the charging or withdrawal of refrigerant shall be checked for accuracy and adjusted according to the pressure measuring instrument manufacturer’s instructions 10.4 Charging, Withdrawal, and Release of Refrigerants. Service containers shall not be left connected to a system, except while charging or withdrawing refrigerant. Refrigerants withdrawn from refrigeration systems shall be transferred into approved… 10.5 Refrigerant Piping System Test
28	11. Mechanical Ventilation 11.1 Ventilation. Where used as a basis for adjusting the maximum refrigerant charge (mmax) in Section 9.6, ventilation shall comply with Sections 11.1.1 through 11.1.3.
29	12. Add-On Heat Pumps 12.1 Installation of add-on heat pumps containing A2L refrigerants shall comply additionally with Sections 12.1.1 through 12.1.6. Table 12-1 Maximum Inductive Loads (kVA) 13. Normative References
31	Informative Appendix A: Explanatory Material
36	Informative Appendix B: General Service and Maintenance B1. Service Instructions B1.1 Personnel performing service and maintenance of the refrigeration system should be trained and competent with respect to their tasks, meeting all applicable local, state, or national licensing requirements. B1.2 Personnel performing service and maintenance should follow manufacturer’s instructions with respect to the addition and removal of refrigerants, oils, additives, controls, and accessories. Maintenance and service personnel should adhere to man… B2. Service And Maintenance Documentation B2.1 The service or maintenance technician should keep a service record of all service and maintenance performed on the refrigerant detection system or when the refrigerant circuit is repaired or replaced. This service record should be kept on site. … B2.2 In the service record, the following information should be recorded: B3. Maintenance B3.1 Refrigeration systems should be maintained by the user in a clean condition, free from accumulations of oily dirt, waste, and other debris, and access to refrigeration systems should be provided at all times. B3.2 Maintenance, service, and replacement of refrigerant detection systems or refrigerant detection system components should be performed in accordance with the system manufacturer’s instructions. B4. Repair B4.1 Repairs on refrigerant-containing components should be performed by certified, licensed personnel and carried out in the following order, as appropriate: B4.2 Refrigerant Leaks
37	B4.3 After a pressure relief valve has been actuated, it should be replaced. B4.4 When oil is drained from a refrigeration system, it should be removed safely in accordance with the system manufacturer’s instruction manual. B5. Change Of Refrigerant Type B5.1 Refrigerant Conversion. Changes of refrigerant in an existing refrigeration system to a refrigerant with a different refrigerant designation should only be allowed in accordance with all requirements of Sections B5.1.1 through B5.1.4. B6. Charging, Withdrawal, And Disposition Of Refrigerants B6.1 No service containers should be left connected to a system except while charging or withdrawing refrigerant. Refrigerants withdrawn from refrigeration systems should be transferred to approved containers only. Except for discharge of pressure re… B6.2 Containers. Containers used for refrigerants withdrawn from a refrigeration system should be as prescribed in the pertinent regulations of the U.S. Department of Transportation or equivalent local enforcement agency and should be weighed each ti… B6.3 Calibration of Pressure Measuring Equipment. Pressure measuring equipment should be checked for accuracy and calibrated prior to test and immediately after every occasion of unusually high (full-scale) pressure, by comparison with master gages o… B6.4 Periodic Tests. Refrigerant detection systems, alarm(s), and mechanical ventilating systems should be tested in accordance with manufacturers’ specifications.
38	Informative Appendix C: Informative References

Additional information

Standard Title	ASHRAE Standard 15.2-2022 — Safety Standard for Refrigeration Systems in Residential Applications (ANSI Approved)
Published Code	ASHRAE
Publication Date	2022
Pages Count	40

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ASHRAE Standard 15.2 2022

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