Refrigeration Standards Update
Standards Australia has recently released five new Standards relating to refrigeration systems and refrigerant designation which has superseded the equivalent existing standards AS/NZS 1677.1 Refrigerating systems, Part 1: Refrigerant classification and AS/NZS 1677.2 Refrigerating systems, Part 2: Safety requirements for fixed applications which have been in use since 1998.
The new standards are based on standards already published by the International Organization for Standardization (ISO) and will be adopted with minor modifications in an Appendix ZZ. The publication of the ISO standards in 2014 has been driven by the gradual reduction of fluorocarbon refrigerants which in turn has accelerated the introduction of new and alternative refrigerants and blends. The adoption of the ISO standards in Australia and New Zealand will bring local refrigeration practice in-line with international practice.
The new standards include:
AS/NZS ISO 817:2016 Refrigerants – Designation and safety classification
This has superseded AS 1677 Part 1 and introduce two new refrigerant safety classifications including A2L (non-toxic, lower flammability) and B2L (toxic, lower flammability) in addition to the existing five classifications A1, A2, A3, B1 and B2. The new ‘lower flammability’ classification will include the A2L refrigerants R32 and R1234 and also the B2L refrigerant R717.
* Refrigerant Classification per ISO 817:2014 and ANSI/ASHRAE Standard 34-2013. A2L and B2L are lower flammability refrigerants with a maximum burning velocity of 10 cm/s.
AS/NZS 5149 Refrigerating systems and heat pumps – Safety and environmental requirements, Part 1 to 4.
This has superseded AS 1677 Part 2 and “specifies the requirements for the safety of persons and property, provides guidance for the protection of the environment, and establishes procedures for the operation, maintenance, and repair of refrigerating systems and the recovery of refrigerants”.
The new standards relate to a wide range of installations from low charge systemsAto very large industrial refrigeration systems. The AS/NZS 5149 series, when introduced, will apply to:
- new refrigerating systems, extensions or modifications to already existing systems, and for used systems being transferred to and operated on another site;
- fixed or mobile systems (excepting vehicle air conditioning systems) of all sizes including heat pumps;
- secondary cooling or heating systems;
- conversion of a system to another refrigerant;
- the location of the refrigeration systems;
- replaced parts and added components if they are not identical in function and in capacity.
- AS/NZS 60335-1:2011 covers the requirements for electrical appliances used for household and commercial purposes.