Leak Checking: Direct or Indirect methods

Leak Checking: Direct or Indirect methods

Our technical bulletin on leak checking clarifies for members the definitions and appropriate leak checking method for stationary RACHP (Refrigeration, Air Conditioning and Heat Pump) systems under the F-gas Regulation (EC517/2014).

Regulation EC517/2014 is commonly referred to as “The F-gas Regulation” as reviewed and adopted in 2014.

The implementation of an EU regulation is confirmed by a series of “implementing acts” or “implementing regulations” each covering different aspects of implementation such as training and certification requirements, determination of quota levels, or, in the case of leakage checking requirements, EC1516/2007 which establishes “standard leakage checking requirements for SRACHP equipment”.


Direct leak checking is one or more of the following:

  • checking of circuits and components representing a risk of leakage with gas detection devices adapted to the refrigerant in the system
  • application of ultraviolet (UV) detection fluid or suitable dye in the circuit
  • proprietary bubble solutions/soapsuds
  • using oxygen-free nitrogen (OFN) to pressurise the circuit after recovering the refrigerant gas

Indirect leak checking is analysis of one or more of the following:

  • pressure(s)
  • temperatures
  • compressor run current
  • liquid level checks
  • recharge volume where applicable 
  • visual inspection

Full guidance about choosing the correct method and repairs after identifying leaks can be found in our Technical Bulletin here 

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