Exam 6: Refrigerant System Servicing and Testingair-Conditioning System Servicing and Testing

Technician A says that the electronic leak detector probe should be held directly against a suspected leak area during a eak test.Technician B says that the electronic leak detector requires routine calibration and probe tip inspection and maintenance.Who is correct?

Most original equipment manufacturers use what type of lubricant in their R-134a systems?

Technician A says the performance test is a way of measuring system pressures.Technician B says the performance test is a way of measuring the outside humidity.Who is correct?

The electronic (halogen)leak detector is the most expensive and sensitive of all leak detection devices.

Explain when a soap solution should be used as a method of leak detection.

What are the sources of refrigerant system contamination?

Explain why recharging the air conditioning system is the most important service procedure the technician will perform on the system.

When servicing a Hybrid vehicles refrigerant system it is imperative that the correct what be used in the refrigerant system?

Technician A says that the A/C system may be charge through the LOW side when the system is operating.Technician B says that the A/C system may be charged through the HIGH side when the system is off .Who is correct?

Charging the system is being discussed.Technician Asays the refrigerant must be weighed (or metered)to obtain a proper charge.Technician B says overcharging the system will reduce its cooling efficiency.Who is correct?

What two factors determine the amount of moisture removed from an air conditioning system?

List popular methods of refrigerant leak detection.

When evacuating the system,what position should all service valves and manifold gauge valves be in?

The pressure of the bulk recovery tank can be tested to identify refrigerant cross contamination.

Refrigeration oil circulates with the refrigerant through the system.

Technician A says that the recommended oil for most R-134a systems is PAG oil.Technician B says that the recommended oil for R-12 systems is mineral-based oil.Who is correct?

What is the minimum time a system should be evacuated for?

Technician A says "intent to vent" means the technician is working in a shop without adequate ventilation.Technician B says "intent to vent" means the technician is working on an air conditioner in a shop that does not have a recovery machine for each type of refrigerant being serviced.Who is correct?

All of the following statements about system evacuation are true,EXCEPT:

When making system repairs,install the receiver-drier or accumulator