AC chapter 7

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?

(Both Tech and Neither = Wrong answer)

An air conditioning system should be pumped down (evacuated) for a minimum of ____ minutes.

30

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?

Both

Refrigerant analyzers or identifiers are being discussed. Technician A says if the analyzer displays "R-134a," then the refrigerant is 98 percent pure. Technician B says if "HC" is displayed, then the refrigerant is flammable. Who is correct?

Both Tech

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?

Both Tech

Technician A says the manifold and gauge set is an important diagnostic tool. Technician B says the manifold and gauge set is an important tool for evacuating and charging the system. Who is correct?

Both Tech

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

PAG

During routine equipment inspection a technician notices that the R-134a recovery tank pressure is 115 psig at an ambient tank temperature of 85°F. Using the chart above what should the technician conclude?

Tank pressure is high and contaminated with non-condensable gas.

Technician A says recycled refrigerant in portable storage containers should be periodically checked for noncondensable gas contamination. Technician B says contaminated refrigerant will not affect system performance.. Who is correct?

Tech A

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?

Tech A

Technician A says a soap solution must only be used in well-ventilated spaces only. Technician B says leaks often occur in areas of limited access where it is difficult to use a halogen leak detector. Who is correct?

Tech B

Technician A says that the evacuation process will remove dirt and debris from the refrigerant system. Technician B says that the evacuation process will remove moisture and air from the refrigerant system. Who is correct?

Tech B

Technician A says any kind of refrigerant can be added to the system for leak testing. Technician B says it is not necessary to purge the hose between the refrigerant container and gauge manifold when adding refrigerant for leak testing. Who is correct?

neither

Many pieces of air conditioning service equipment can do all of the following, EXCEPT:

refrigerant reclaiming

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

tech B