Type 2 Test 1

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

• HFCs

• HCFCs to lower the cost of discarding the refrigerant.

• pressurized nitrogen.

• compressed oxygen.

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

• HFCs

• HCFCs

• pressurized nitrogen.

• compressed air.

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

• simply remove the compressor.

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

• evacuate the isolated section of the system to 10 inches of vacuum and hold. If the system pressure does not rise, remove the compressor.

• evacuate the isolated section of the system to 15 inches of vacuum and hold. If the system pressure does not rise, remove the compressor.

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

• vapor through the suction line service valve.

• liquid through the discharge service valve.

• liquid through the suction service valve.

• liquid through the liquid line service valve.

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

• evacuated.

• pressurized with R-22, then leak checked.

• pressurized with R-410A, then leak checked.

• pressurized with nitrogen, then leak checked.

Pressure relief valves must not be

• installed in series.

• installed in parallel.

• installed vertically.

• installed in horizontally.

What is the required recovery vacuum for a system?

• 10 psig

• 20 psig

• 35 psig

• 100 psig

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?

• The recovery unit must be EPA-certified for use with R-410A.

• The recovery tank must be designed for the pressure of R-410A.

• The filter and lubricant in the recovery unit must be changed and the recovery unit evacuated.

• All of the above.

After reaching the required recovery vacuum on a system you must

• immediately disconnect the recovery or recycling equipment and open the system for service.

• immediately break the vacuum with nitrogen and open the system for service.

• immediately pressurize the system with nitrogen and perform a leak check.

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

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

• receiver.

• metering device.

• accumulator.

• condenser.