Question 1

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

Accepted Answer

A) True 
 B)False

Question 2

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

Accepted Answer

When is the last time the syst

Question 3

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

Accepted Answer

A) True 
 B)False

Question 4

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

Accepted Answer

A) True 
 B)False

Question 5

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?

Accepted Answer

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

Question 6

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

Accepted Answer

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

Question 7

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

Accepted Answer

80 percent

Question 8

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

Accepted Answer

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. 
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 9

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?

Accepted Answer

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

Question 10

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?

Accepted Answer

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

Question 11

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

Accepted Answer

The system probably

Question 12

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

Accepted Answer

The R-744 system can also serve as a sou

Question 13

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

Accepted Answer

After the components

Question 14

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

Accepted Answer

A) True 
 B)False

Question 15

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

Accepted Answer

A) True 
 B)False

Question 16

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

Accepted Answer

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

Question 17

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?

Accepted Answer

Placing a fused jumper wire ac

Question 18

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

Accepted Answer

A) True 
 B)False

Question 19

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

Accepted Answer

Retrofit conversion service fittings for

Question 20

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

Accepted Answer

Compressors should not be repl

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

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

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

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

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?

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

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

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

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?

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?

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

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

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

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

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

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

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?

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

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

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

Heating and Air Conditioning - History and the Environment

Temperature and Pressure Fundamentals

Engine Cooling and Comfort Heating Systemsdiagnosis and Service of Engine Cooling and Comfort Heating Systems

Air-Conditioning System Operating Principlesthe Manifold and Gauge Set

Refrigerant System Componentsservicing System Components

Refrigerant System Servicing and Testingair-Conditioning System Servicing and Testing

Diagnosis of the Refrigeration System

Compressors and Clutches

Case and Duct Systems

System Controlsdiagnosis and Service of System Controls

Extenssion 1: Shop Safety

Extenssion 2: Typical Shop Procedures and Tools

Filters

Exam 11: Retrofit and Future Trends

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

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

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

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

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?

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

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

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

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?

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?

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

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

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

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

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

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

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?

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

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

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

Heating and Air Conditioning - History and the Environment

Temperature and Pressure Fundamentals

Engine Cooling and Comfort Heating Systemsdiagnosis and Service of Engine Cooling and Comfort Heating Systems

Air-Conditioning System Operating Principlesthe Manifold and Gauge Set

Refrigerant System Componentsservicing System Components

Refrigerant System Servicing and Testingair-Conditioning System Servicing and Testing

Diagnosis of the Refrigeration System

Compressors and Clutches

Case and Duct Systems

System Controlsdiagnosis and Service of System Controls

Extenssion 1: Shop Safety

Extenssion 2: Typical Shop Procedures and Tools

Filters