Leak testing
Also known as: leak test, leak detection, leak check
Short definitionSearching the refrigeration circuit for escaping refrigerant with a detector, foam and pressure methods. Under the F-gas rules it is done regularly on systems whose charge reaches 5 tonnes CO₂ equivalent.
The circuit is sealed and refrigerant is not consumed; if the gas is low, it is leaking somewhere. A new or repaired circuit is tested with nitrogen before it is charged, and a running system is scanned at intervals. An electronic detector senses leaks of around 5 grams a year, and foam pinpoints the spot. An oil stain around a joint is often the first sign.
The mandatory check interval depends on charge weight multiplied by GWP: once a year from 5 tonnes CO₂ equivalent, every six months above 50 tonnes, every three months above 500 tonnes. A charge of 3.5 kg of R134a reaches that threshold. The check is done by a certified technician and recorded. Choosing brazed joints instead of flare fittings in the design reduces the number of leak points.