AC chapter 7

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

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 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

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

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

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

PAG

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

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

refrigerant reclaiming