Do you recommend purchasing a dry charge air conditioning system. As the others said use your manifold gauges to add the nitrogen to the system we always pressure test200 psithe system with nitrogen first then vaccum test second.
Below is the standard procedure for the proper flushing of air conditioning and refrigeration system with the use of dry nitrogen and refrigeration equipment which require flushing of the system after exposing it to the atmosphere or during replacement of the refrigerant compressor.
How to charge ac system with nitrogen.
Have replaced entire system in the 911 except the rear lid condenser flushed and added two addl fan assisted condenser in the rear wheel well.
These days condensers or heat pumps intended for use in a replacement r 22 system are now referred to as dry charge or nitrogen charged systems.
I really like having the nitrogen for leak testing.
Here are some frequently asked questions about this recent ac dry charge trend.
Its nice to know that a system is sealed up properly before i actually charge it with exxxpensive and ozone busting freon.
So under certain conditions a technician will quickly run a compressor when the system is charged with nitrogen to clear the cylinders.
Im no expert but i read up quite a bit on this and im convinced its best to stay with real r12 rather than switching to anything else.
Then use the vaccum to pull your freon in as much as possible.
During triple evacuation nitrogen is purged into the system to absorb and mix with other vapors.
Borrowed a nitrogen bottle from a buddy to purge the lines and pressure test the system before charging.
Nitrogen flushing of air conditioning and refrigeration systems.
Also compressor cylinders can trap noncondensable gases and moisure.
All thats left to to do now is install the rebuilt compressor add oil evac and charge the system.
It depends on a number of things.
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