AC432 Part 2

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8. A capillary tube controls the refrigerant flow into the evaporator.

True

False

9. A refrigeration system that continuously runs under high-load conditions (hot pull downs) would most likely use a thermostatic expansion valve with a vapor charged thermal bulb assembly.

True

False

10. An AX valve works best when the evaporator load is constant.

True

False

11. Too high of pressure entering the compressor will cause the density of suction gases entering the compressor to increase.

True

False

12. The step-motor valve uses a small motor to control the valve's port, which in turn controls evaporator superheat.

True

False

13. The TXV sensing bulb is mounted ____.

On the liquid line between the condenser and the TX valve

At the inlet to the condenser

On the suction line between the evaporator and the compressor

On the compressor discharge line

14. A refrigeration system requiring a "fast pull down" would most likely use a thermostatic expansion valve with a liquid - thermal bulb.

True

False

15. If a thermostatic expansion valve's thermal bulb came loose from the suction line at the outlet of the evaporator, which of the following could result?

The bulb pressure would increase and the thermostatic expansion valve would open.

The superheat in the evaporator would decrease.

Liquid refrigerant would flow back to the compressor.

All of the above are correct.

16. If the thermal bulb assembly develops a leak, what will occur?

All of the system's refrigerant will leak out.

The bulb pressure will reduce and the valve will close.

The valve will open to allow more refrigerant to flow.

It will have no effect on system operation.

17. The purpose of an externally equalized thermostatic expansion valve is to ____.

Compensate for excessive evaporator pressure drop

Allow system to equalize faster

Prevent the expansion valve from frosting up

Allow refrigerant to expand in the compressor

18. When the load on the evaporator increases, the TX valve ____.

Increases the flow of refrigerant

Decreases the flow of refrigerant

Maintains constant head pressure

Decreases the pressure drop across the evaporator

19. The primary function of an expansion device is to ____.

Produce a reduction in the pressure on the liquid refrigerant

Regulate the flow of refrigerant into the evaporator

All of the above

20. The purpose of a capillary tube is to ____.

Regulate the refrigerant flow into the evaporator

Lower the pressure of the liquid refrigerant

Lower the boiling point of the refrigerant

All of the above

21. A vapor-charged thermal bulb assembly responds faster than a liquid-charged thermal bulb assembly.

True

False

22. Balanced port TX valves are used to ____.

Feed refrigerant at a normal rate with low condenser entering air temperatures

Feed refrigerant at a normal rate with high condenser entering air temperatures

Stop refrigerant flow with high condenser entering air temperatures

Stop refrigerant flow with low condenser entering air temperatures

23. The cross liquid charge bulb at the TXV contains fluid that ____.

Has similar characteristics to the system fluid to prevent liquid refrigerant from entering the suction line

Has different characteristics from the system fluid

Causes the valve to stay open during the off cycle

Follows the typical pressure-temperature relationship

24. If the power element of a TX valve loses its charge, the ____.

Coil will flood enough to feed liquid refrigerant out of the coil

Valve will get cold enough to create frost on the body of the valve

Refrigerant flow through the various circuits of the coil will become unbalanced

Refrigerant flow to the coil will stop

25. A thermostatic expansion valve controls refrigerant flow to the evaporator based on ____.

Rate of liquid vaporization

Evaporator suction line superheat

External equalizer pressure

All of the above

26. The pressure limiting TX valve ____.

Allows the compressor to operate at low condenser entering air temperatures

Shuts off the condenser fan during hot pull down

Maintains the full refrigerant flow rate during a hot pull down

Limits the refrigerant flow rate to the compressor capacity

27. The pin or valve port piston of the electronic step-motor expansion valve can move a linear motion of 0.0783 inches/step.

True

False

28. An automatic expansion valve uses a thermal bulb to help control the amount of refrigerant being fed into the evaporator.

True

False

29. As the load on an evaporator increases, the automatic expansion valve will open to allow more refrigerant to enter the evaporator.

True

False

30. A refrigeration system is operating with a vapor charged thermostatic expansion valve. The thermal bulb is sensing a suction line temperature that is higher than the temperature that allows liquid to be present in the bulb. Any additional increases in the evaporator load will ____.

Increase the bulb pressure and cause the thermostatic expansion valve to open

Increase the evaporator pressure and cause the thermostatic expansion valve to close

Decrease the spring pressure and cause the thermostatic expansion valve to open

Have no effect on the position of the needle (pin) in the seat

Ac432 Part 2

1. The automatic expansion valve maintains a constant _____.

2.

What first name or nickname would you like us to use?

2. As the evaporator load increases, an automatic expansion valve will _ to reduce the evaporator pressure while a thermostatic expansion valve will _ to reduce the evaporator superheat.

3. The correct term for a coil using a low side float is _____.

4. The two pressures that push to close a thermostatic expansion valve are the _ pressure and the _ pressure.

5. When the quantity of refrigerant flow to an evaporator is reduced, the amount of superheat in the vapor leaving the coil will _____.

6. The correct term for a coil using a TX valve, capillary tubes, or restrictor is _____.

7. The TX valve maintains a constant _____.

8. A capillary tube controls the refrigerant flow into the evaporator.

9. A refrigeration system that continuously runs under high-load conditions (hot pull downs) would most likely use a thermostatic expansion valve with a vapor charged thermal bulb assembly.

10. An AX valve works best when the evaporator load is constant.

11. Too high of pressure entering the compressor will cause the density of suction gases entering the compressor to increase.

12. The step-motor valve uses a small motor to control the valve's port, which in turn controls evaporator superheat.

13. The TXV sensing bulb is mounted ____.

14. A refrigeration system requiring a "fast pull down" would most likely use a thermostatic expansion valve with a liquid - thermal bulb.

15. If a thermostatic expansion valve's thermal bulb came loose from the suction line at the outlet of the evaporator, which of the following could result?

16. If the thermal bulb assembly develops a leak, what will occur?

17. The purpose of an externally equalized thermostatic expansion valve is to ____.

18. When the load on the evaporator increases, the TX valve ____.

19. The primary function of an expansion device is to ____.

20. The purpose of a capillary tube is to ____.

21. A vapor-charged thermal bulb assembly responds faster than a liquid-charged thermal bulb assembly.

22. Balanced port TX valves are used to ____.

23. The cross liquid charge bulb at the TXV contains fluid that ____.

24. If the power element of a TX valve loses its charge, the ____.

25. A thermostatic expansion valve controls refrigerant flow to the evaporator based on ____.

26. The pressure limiting TX valve ____.

27. The pin or valve port piston of the electronic step-motor expansion valve can move a linear motion of 0.0783 inches/step.

28. An automatic expansion valve uses a thermal bulb to help control the amount of refrigerant being fed into the evaporator.

29. As the load on an evaporator increases, the automatic expansion valve will open to allow more refrigerant to enter the evaporator.

30. A refrigeration system is operating with a vapor charged thermostatic expansion valve. The thermal bulb is sensing a suction line temperature that is higher than the temperature that allows liquid to be present in the bulb. Any additional increases in the evaporator load will ____.

Ac432 Part 2

1. The automatic expansion valve maintains a constant _____.

2.

What first name or nickname would you like us to use?

2. As the evaporator load increases, an automatic expansion valve will _____ to reduce the evaporator pressure while a thermostatic expansion valve will _____ to reduce the evaporator superheat.

3. The correct term for a coil using a low side float is _____.

4. The two pressures that push to close a thermostatic expansion valve are the _____ pressure and the _____ pressure.

5. When the quantity of refrigerant flow to an evaporator is reduced, the amount of superheat in the vapor leaving the coil will _____.

6. The correct term for a coil using a TX valve, capillary tubes, or restrictor is _____.

7. The TX valve maintains a constant _____.

8. A capillary tube controls the refrigerant flow into the evaporator.

9. A refrigeration system that continuously runs under high-load conditions (hot pull downs) would most likely use a thermostatic expansion valve with a vapor charged thermal bulb assembly.

10. An AX valve works best when the evaporator load is constant.

11. Too high of pressure entering the compressor will cause the density of suction gases entering the compressor to increase.

12. The step-motor valve uses a small motor to control the valve's port, which in turn controls evaporator superheat.

13. The TXV sensing bulb is mounted ____.

14. A refrigeration system requiring a "fast pull down" would most likely use a thermostatic expansion valve with a liquid - thermal bulb.

15. If a thermostatic expansion valve's thermal bulb came loose from the suction line at the outlet of the evaporator, which of the following could result?

16. If the thermal bulb assembly develops a leak, what will occur?

17. The purpose of an externally equalized thermostatic expansion valve is to ____.

18. When the load on the evaporator increases, the TX valve ____.

19. The primary function of an expansion device is to ____.

20. The purpose of a capillary tube is to ____.

21. A vapor-charged thermal bulb assembly responds faster than a liquid-charged thermal bulb assembly.

22. Balanced port TX valves are used to ____.

23. The cross liquid charge bulb at the TXV contains fluid that ____.

24. If the power element of a TX valve loses its charge, the ____.

25. A thermostatic expansion valve controls refrigerant flow to the evaporator based on ____.

26. The pressure limiting TX valve ____.

27. The pin or valve port piston of the electronic step-motor expansion valve can move a linear motion of 0.0783 inches/step.

28. An automatic expansion valve uses a thermal bulb to help control the amount of refrigerant being fed into the evaporator.

29. As the load on an evaporator increases, the automatic expansion valve will open to allow more refrigerant to enter the evaporator.

30. A refrigeration system is operating with a vapor charged thermostatic expansion valve. The thermal bulb is sensing a suction line temperature that is higher than the temperature that allows liquid to be present in the bulb. Any additional increases in the evaporator load will ____.

2. As the evaporator load increases, an automatic expansion valve will _ to reduce the evaporator pressure while a thermostatic expansion valve will _ to reduce the evaporator superheat.

4. The two pressures that push to close a thermostatic expansion valve are the _ pressure and the _ pressure.