Deck 11: Retrofit and Future Trends

Question 1

XH7 and XH9 desiccants are compatible with R-134a and R-12 refrigerants.

Answer 1

True

Question 2

Technician A says mixing two different refrigerants in an air conditioning system is not considered contamination.Technician B says air in an air conditioning system will cause contamination.Who is correct?

A) Technician A only
B) Technician B only
C) Both A and B
D) Neither A nor B

Answer 2

B

Question 3

Which of the following desiccants should be used with HFC-134a refrigerant?

A) XH5
B) XH7
C) XH9
D) b and c

Answer 3

D

Question 4

Which of the following desiccants should be used with HFC-134a refrigerant?

A) XH5
B) XH7
C) XH9
D) Both B and C

Question 5

R-12 with greater than 2 percent of R-134a is considered contaminated.

Question 6

Under the CAA,anyone performing repairs to a motor vehicle air conditioning system for pay must

A) be certified.
B)
B) use recovery/recycle equipment.
C) be a salaried employee of the shop.
D) a and

Question 7

Technician A says that the shop that performed the A/C system retrofit must be identified on the retrofit label.Technician B says that the new refrigerant installed must be identified on the retrofit label.Who is correct?

A) Technician A only
B) Technician B only
C) Both A and B
D) Neither A nor B

Question 8

Technician A says mineral oil is compatible with R-12.Technician B says mineral oil is compatible with R-134a.Who is correct?

A) Technician A only
B) Technician B only
C) Both A and B
D) Neither A nor B

Question 9

Three refrigerants are currently approved by the EPA for automotive use to replace R-12.

Question 10

R-744 is an acceptable substitute for both R-12 and R-134a in a refrigerant system retrofit.

Question 11

The air conditioning system is purged of refrigerant if the manifold gauges show a vacuum.

Question 12

The R-744 system can serve as a source of heat for the passenger compartment through the use of an integrated heat pump.

Question 13

R-744 systems require about half the refrigerant capacity of current R-134a systems.

Question 14

The retro fit label's background color for R-134a refrigerant is:

A) Tan
B) Royal Blue
C) Light Blue
D) White

Question 15

To drain oil from a component,the component must be removed from the vehicle.

Question 16

Technician A says changing any part of an original design changes the performance of the equipment.Technician B says if an extra fan and motor are added,a relay should also be added.Who is correct?

A) Technician A only
B) Technician B only
C) Both A and B
D) Neither A nor B

Question 17

A refrigerant retro fit label must contain all of the following,Except:

A) The refrigerant charge amount installed.
B) The amount of R-12 removed from the system.
C) The type of refrigerant oil installed and the part number.
D) Name and address of the installer who performed the retrofit.

Question 18

A purity test should be held any time there is a concern about the quality of the refrigerant in the system.

Question 19

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

A) All systems should be evacuated for a minimum of 30 minutes.
B) Vacuum should reach at least 24 to 26 inHg (20.3 to 23.5 kPa absolute) in the first 15 minutes.
C) If vacuum does not reach 24 to 26 inHg (20.3 to 23.5 kPa absolute), evacuate for a longer time.
D) The longer the evacuation period, the better the moisture removal.

Question 20

A modification that updates or upgrades a system or device is called a retrofit.

Question 21

Technician A says flushing the air conditioning before retrofitting is a common procedure.Technician B says each component should be removed and flushed individually.Who is correct?

A) Technician A only
B) Technician B only
C) Both A and B
D) Neither A nor B

Question 22

When should an air conditioning system be evacuated?

Question 23

Under what conditions should system oil be charged directly into the compressor?

Question 24

What is the maximum capacity a recovery cylinder should be filled to at ambient temperatures.

Question 25

Vacuum measurement is being discussed.Technician A says the best method is to use an electronic thermistor vacuum gauge.Technician B says a thermistor may use an analog gauge to display vacuum readings.Who is correct?

A) Technician A only
B) Technician B only
C) Both A and B
D) Neither A nor B

Question 26

The concern in the world community has shifted from the threat of ozone-depleting chemicals to a concern over which of the following?

A) Global weather
B) Global disaster
C) Global cooling
D) Global warming

Question 27

What is the advantage of placing the vehicle in a draft-free work area?

Question 28

During the charging process of a FOT cycling-clutch system,how can you override the system so the compressor will stay engaged and not cycle?

Question 29

Under what conditions should hoses be replaced during a retrofit?

Question 30

Why is it important to affix decals to identify a new refrigerant type?

Question 31

During the retrofit process,when should service ports be changed from R-12 to R-134a access type?

Question 32

Retrofits are being discussed.Technician A says the procedure involves replacing the refrigerant.Technician B says new service fittings must be installed.Who is correct?

A) Technician A only
B) Technician B only
C) Both A and B
D) Neither A nor B

Question 33

The Clean Air Act of 1990 says after July 1,1992,which of the following refrigerants may be intentionally vented?

A) R-12
B) R-134a
C) R-22
D) None of the above

Question 34

What does it mean if after 5 minutes,the vacuum pump cannot pull a reasonable vacuum on the refrigerant system?

Question 35

Why should the technician rotate the clutch armature several revolutions by hand during charging?

Question 36

Technician A says the purity of refrigerants has been set by SAE purity standards for both R-12 and R-134a.Technician B says refrigerant should test at least 98 percent pure when tested with a purity tester.Who is correct?

A) Technician A only
B) Technician B only
C) Both A and B
D) Neither A nor B

Question 37

All of the following statements about thermostatic expansion vales on retrofitted systems are true,EXCEPT:

A) The expansion valve does not have to be replaced when retrofitting a system from R-12 to R-134a.
B) If a defective expansion valve is replaced, always use a model designed for the system refrigerant.
C) A R-12 expansion valve used in an R-134a system will result in higher superheat and reduced evaporator efficiency.
D) An R-134a valve used in a R-12 system will have reduced superheat.

Question 38

All of the following are removed when the air conditioner is evacuated,EXCEPT:

A) refrigerant.
B) oil.
C) moisture.
D) All of the above are removed.

Question 39

Evacuation of an air conditioning system is being discussed.Technician A says one factor affecting the speed of evacuation is internal restrictions.Technician B says all of the oil is usually removed during evacuation.Who is correct?

A) Technician A only
B) Technician B only
C) Both A and B
D) Neither A nor B

Question 40

Technician A says after the retrofit is complete,a function test should be made.Technician B says system pressures and temperatures for HFC-134a should be the same as for CFC-12.Who is correct?

A) Technician A only
B) Technician B only
C) Both A and B
D) Neither A nor B

Question 41

Discuss the use of conversion service fittings for conversions of R-12 to R-134a refrigerant.

Question 42

Give the general guidelines for determining whether a compressor should be replaced during retrofit.

Question 43

Why would a R-744 refrigerant system work well on a fuel cell-powered vehicle?

Question 44

When should a saddle clamp access valve be installed?

Question 45

What questions should the technician ask the customer if there is a possibility that the refrigerant is contaminated?