Service Gases From National Refrigerants

National Refrigerants service gases Oxygen Free Nitrogen (OFN) and Tracer Gas are used for pressure testing and leak detecting before introducing expensive refrigerants into the system.
When a new system is installed or an existing system is repaired the refrigerant circuit may no longer be airtight leading to loss of refrigerant.

Pressure testing should always be performed when a refrigerant circuit is broken to ensure that these F-Gases do not escape into the atmosphere.

Normally this is done using nitrogen which is the most cost-effective inert gas and makes up 78% of the air we breathe.

For critical systems, tests should be performed using Tracer Gas which is 95% nitrogen and 5% hydrogen, as hydrogen has the smallest known molecule it will find the smallest leak in any system.

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