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PARTNER FOCUS Recovery without compromise


In June 2025, Evolution Cooling and A-Gas recovered 220kg of R134a     


I


n June 2025, Evolution Cooling undertook a technically complex refrigerant recovery operation involving two rooftop-mounted chillers at the end of their service life. The equipment, which contained an estimated 220 kilograms of R134a, required specialist handling due to its rooftop location and non-operational state as well as the regulatory obligations  Delivered in partnership with A-Gas, a global leader in


refrigerant lifecycle services, the project successfully reclaimed the entire refrigerant charge with zero emissions, no system  


constraints. Both chillers were situated on a multi-storey rooftop with limited external access, and neither unit was powered, removing the option of pumping down via conventional internal compressors.  with high global warming potential and is subject to stringent handling, recovery and reporting requirements under UK and EU environmental legislation. Any uncontrolled release of this gas would not only risk environmental impact but could also result in regulatory penalties for both the contractor and the asset owner. In this case, Evolution Cooling opted to engage A-Gas’ Rapid


Recovery service to manage the extraction. The decision was based on the need for a high-capacity, mobile recovery solution capable of handling static refrigerant charges in elevated, inaccessible units, and doing so quickly and securely without cross-contamination or loss. The operation began with a site survey conducted by A-Gas technicians to validate the estimated volume and determine the  restricted and no internal pressure available within the chillers, external extraction was required. A-Gas deployed a combination  stationed at ground level. The hoses were routed from the rooftop down to the base of the building, allowing technicians to work from a stable platform while maintaining closed-loop 


 Crucial to the success of the operation was A-Gas’ use of a


‘pull-pull’ recovery method, a technique designed to maintain a steady transfer of refrigerant from source to cylinder without over-pressurising the system or inducing turbulence that could   capacity to drive refrigerant movement. By carefully balancing vacuum pressure on the receiving cylinders and ensuring uninterrupted hose integrity, technicians were able to extract the entire charge without venting, leakage or interruption.


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 the physical challenges of the site, which ensured minimal disruption to adjacent systems and eliminated the need for extended plant downtime. All recovered R134a was transferred securely into approved storage vessels and transported to an A-Gas processing site


 and separation process to return it to a virgin-equivalent


 This project highlights several critical considerations for air conditioning engineers involved in large-scale decommissioning.   rooftop installations. Second, it illustrates how mobile recovery services, such as  capacity. Rather than relying solely on standard pump-down  to manage refrigerant safely even when normal service   decommissioning, all of which are becoming more frequent as ageing infrastructure is replaced. Third, the recovery operation validates the application of lifecycle refrigerant principles in day-to-day engineering practice.  requirement, its role in resource conservation and emissions  reclamation and reuse into their projects are taking steps not only to meet regulatory standards but also to make meaningful contributions to environmental stewardship.


The decision was based on the need for a high-capacity, mobile recovery solution capable of


handling static refrigerant charges in elevated, inaccessible units, and doing so quickly and securely


without cross- contamination or loss.


www.acr-news.com • August 2025 23


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