What is the source of most non-condensables in refrigeration systems?

Study for the EPA Type 2 Test. Explore flashcards and multiple choice questions, with each question offering hints and explanations. Get prepared for your exam!

Non-condensables are gases that won’t condense at the condenser’s operating temperature. The most common source is air entering the system through leaks or improper evacuation during installation or service. This air (mostly nitrogen and oxygen) remains in the refrigerant loop and prevents proper condensation, which raises condenser head pressure and lowers efficiency. Water vapor will condense and be removed, so it isn’t a non-condensable, and helium isn’t used in typical systems. To minimize non-condensables, ensure a proper vacuum before charging and fix leaks; purge the system during service to remove any trapped air.