Testing for Leaks in New HVAC Units

EPISODE 4 - The Ultimate HVAC Change Out 

Nearing the end of an installation or change out, it is important to make sure the new system is balanced and tested. 

Testing for Leaks with Nitrogen

Testing for leaks in the lines of your hvac is almost exactly the same as running air through your bike tires to see if there is a hole. By pushing nitrogen through the Freon lines, you can hear if there is a leak because nitrogen has a higher pressure than normal refrigerant.

Recommended test:

  • Connect nitrogen valve to your line (the valve will have a control gauge)
  • Pressurize nitrogen up to 200 pounds
  • Leave the nitrogen run for about 2 hours 

hvac unit leak test

This process ensures that the lines are dried of excess moisture, and there are no leaks in the soldered joints. It's important to watch for fluctations in pressure, since this will also indicate if the system contains leaks.

Contrary to popular belief, nitrogen is not harmful to use in these tests. The EPA has approved the use of a test mix (R-22 and nitrogen) because it is not a refrigerant and therefore can be released into the atmosphere. 


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