EPA Type 2 Flashcards

Front

Heat pumps that use R-410A should be leak checked with

Back

pressurized nitrogen.

Front

Heat pumps that have been retrofitted from R-22 to R-407C should be leak checked with

Back

pressurized nitrogen.

Front

To change the compressor on a system containing R-410A, you must isolate the compressor and then

Back

Evacuate the isolated section of the system to atmospheric pressure and hold. If the system pressure does not rise, remove the compressor.

Front

Which of the following is the correct way to charge a refrigeration system?

Back

liquid through the liquid line service valve.

Front

After installation of a field-piped R-410A split heat pump, the unit should first be

Back

pressurized with nitrogen, then leak checked.

Front

Pressure relief valves must not be

Back

installed in series.

Front

What is the required recovery vacuum for a system?

Back

35 psig

Front

Your recovery/recycling machine has R-22 refrigerant in it. You now have to recover refrigerant from a unit with R-410A. What must be done before your recovery unit can be used to recover R-410A?

Back

All of the above.

Front

After reaching the required recovery vacuum on a system you must

Back

wait to see if the system pressure rises indicating that there is still refrigerant in liquid form or refrigerant trapped in the oil.

Front

In a refrigeration system, the component directly following the evaporator is the

Back

accumulator.