Unit 67 preview

Technician A says that a refrigerant identifier should be installed on the low-side. Technician B says that a refrigerant identifier should always be installed on the high-side. Who is correct?

• Technician A

• Technician B

• Both Technician A and Technician B

• Neither technician A nor Technician B

Which of the following statements is NOT true regarding a recovery machine?

• An approved machine must always be used.

• The machine used must be for that specific type of refrigerant.

• c.

  A recovery machine can be a stand-alone unit or part of an R/R/R machine

• The recovery machine always recycles the refrigerant.

If the diagnosis of a faulty HVAC system determines that a component of the air-conditioning system is not working properly, such as a faulty cycle switch, then _______ is not needed.

• Leak testing

• Reclaiming

• Evacuating

• Charging

The use of a(n) __________ will protect the investment in approved refrigerant handling and test equipment.

• Four channel probe

• Sealant detection test

• Recovery, recycle, and recharge machine

• Oil injector

What is the minimum amount of time an air-conditioning system should be evacuated for to effectively boil all the water out of the system?

• 10 minutes

• 15 minutes

• 30 minutes

• 45 minutes

Typically, the thermal expansion valve (TXV) is mounted on the of the evaporator.

• Front
• Side

• Back

• Rear

Technician A states that an air-conditioning performance test usually requires that an auxiliary condenser fan be used during the test. Technician B states that a performance test will show if the air-conditioning system is contaminated with sealer. Who is correct?

• Technician A

• Technician B

• Both Technician A and Technician B

• Neither Technician A nor Technician B

Before you begin to identify a refrigerant, you first need to make sure there is no in the system.

• PAG Oil

• Mineral oil
• Refrigerant

• Sealer

Charging a system is performed only after the air-conditioning system has been evacuated and:

• Any oil is replaced.

• The desiccant bag has been replaced.

• All air-conditioning system O-rings have been replaced.

• The thermostat has been replaced.

If the gauges of an air-conditioning system read low pressure on the high side, high pressure on the low side, or about equal pressures, it usually means that:

• The system may be low on refrigerant.

• The compressor is not working.

• There is a blockage in the low side of the system.

• There is a blockage on the high side.