What can be determined using troubleshooting charts?

The condition of the sealed system

How can it be determined whether the high side pressure is too high or too low?

By observing the condenser split

By checking the electrical supply

By measuring the temperature of the refrigerant

What is likely to happen if the condenser split is below 20°F?

The pressures will be too high.

The condenser coil will be too hot.

The temperature will be at saturation.

What is the result of a direct pressure temperature relationship at saturation?

The pressures will also be too high or too low.

The pressures will be too high.

The condenser coil will be too cold.

If the condenser coil is too hot or too cold, what will be the condition of the pressures?

The pressures will also be too high or too low.

The pressures will be at saturation.

The pressures will be too high.

What can be said about the evaporator pressure when the evaporator split is higher than normal?

The evaporator pressure is low.

The evaporator pressure is high.

The evaporator pressure is normal.

The evaporator pressure is not affected by the evaporator split.

What happens to the evaporator coil if the evaporator split is lower than normal?

The evaporator coil is warmer than normal

The evaporator coil is cooler than normal

The evaporator coil is unaffected

What is likely to be true about the pressures when the evaporator split is lower than normal?

The pressures fluctuate rapidly

What can be determined when the pressures in a system are found to be too high or too low?

The condition of the sealed system

The efficiency of the electrical system

The ambient temperature around the system

The warranty status of the system

Which two factors are used to determine the condition of the sealed system when troubleshooting?

The superheat and the sub-cooling

The age of the system and the usage

What does the "level of refrigerant" troubleshooting chart show us?

How superheat and sub-cooling can pinpoint system problems

The efficiency of the refrigerant

The price of refrigerant per pound

The color codes for different refrigerants

What happens to the liquid levels in both the high and low sides of a refrigeration system when there is not enough refrigerant?

Both the high and low sides will have lower than normal liquid levels

Both the high and low sides will have higher than normal liquid levels

The high side will have a normal liquid level, but the low side will have a lower than normal liquid level

The low side will have a normal liquid level, but the high side will have a lower than normal liquid level

What will happen to the high side pressures if the condenser is able to hold the backed up refrigerant?

The high side pressures will decrease

The high side pressures will increase

The high side pressures will remain unchanged

The high side pressures will fluctuate rapidly

What is likely to occur if the condenser fills with refrigerant?

The area going through change of state will shrink, causing high side pressures to increase

The area going through change of state will expand

The area going through change of state will remain the same

The area going through change of state will shrink, causing high side pressures to decrease

What can be a consequence of a severe restriction in the liquid line?

Low sub-cooling due to the lack of refrigerant flow

Increased sub-cooling due to enhanced refrigerant flow

What happens to the evaporator when it is unable to absorb heat?

It leads to light evaporator load

It increases the normal liquid level

What is the condition of sub-cooling when there is a light evaporator load?

Sub-cooling is not related to evaporator load

What will the evaporator temperature difference (TD) be if the increased load is due to too much air?

The evaporator TD will be normal

The evaporator TD will not be affected

What happens to sub-cooling when the refrigerant cannot condense fast enough?

Sub-cooling will not be affected

What will the evaporator TD be if the increased load is due to warmer air?

The evaporator TD will be normal

The evaporator TD will not be affected

What happens to the liquid levels in both the low and high sides of a refrigeration system when there is too much refrigerant?

Both the low and high sides will have higher than normal liquid levels

Both the low and high sides will have lower than normal liquid levels

The low side will have a higher than normal liquid level, and the high side will have a lower than normal liquid level

The low side will have a lower than normal liquid level, and the high side will have a higher than normal liquid level

What is the condition of superheat in a refrigeration system when it is overcharged?

Superheat is not affected by refrigerant charge

What is indicated by the term "sub-cooling" in the context of a refrigeration system?

The temperature of the refrigerant is below its boiling point

The temperature of the refrigerant is above its boiling point

The temperature of the refrigerant is below its condensation point

The temperature of the refrigerant is at its critical point

What is the result of TXV overfeed as indicated in the diagram?

High pressures due to the lack of pressure drop across the metering device

Lower pressures due to increased pressure drop across the metering device

Normal operating pressures with standard pressure drop across the metering device

No change in pressures but increased superheat

According to the diagram, what condition is indicated by the red oval marked "Normal liquid level"?

Normal refrigerant charge with proper liquid level

Undercharged refrigerant system

What does the arrow pointing upwards next to "High Press." indicate in the context of TXV overfeed?

Increasing pressure in the system

Decreasing pressure in the system

What does the "Normal liquid level" in the diagram suggest about the system's operation?

The system has an adequate charge of refrigerant

The system is overcharged with refrigerant

The system is undercharged with refrigerant

The system's liquid level is irrelevant to its operation

Why are pressures high in a system with air and non condensable gases according to the image?

Due to Dalton's law of partial pressures

Because of the ambient air temperature

Due to the capillary tube restrictions

What should be compared to determine if the system has air, as suggested by the image?

Condensing temperature to the ambient air temperature

Condensing temperature to the cap tube size

Ambient air temperature to the system static pressure

Evaporator split to the condenser split

HVAC Troubleshooting Quiz

Authored by Jay Brooke

Specialty

12th Grade

Used 2+ times

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47 questions

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MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What does the troubleshooting process consist of?

Measurement of pressure only

Measurement of temperature only

Measurement of superheat, sub-cooling, evaporator split, and condenser split

Measurement of electrical current only

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What are superheat and sub-cooling measurements used for in the troubleshooting process?

To measure the difference between two pressures

To measure the difference between two temperatures

To measure the electrical current

To measure the speed of the evaporator and condenser fans

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

According to the diagram, what indicates a low pressure condition in the system?

High amp draw

High pressure

Low amp draw

Low pressure

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What does a high pressure condition in the system indicate according to the diagram?

Low amp draw

Sub-cooling

High amp draw

Evaporator split

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is one of the measurements determined using troubleshooting charts?

The pressure of the condenser

The suction line temperature

The flow rate of the refrigerant

The size of the evaporator

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What temperature measurement is associated with the evaporator in troubleshooting charts?

The saturation temperature of the condenser

The liquid line temperature

The saturation temperature of the evaporator

The ambient temperature

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Which of the following is NOT a measurement determined by the troubleshooting charts shown?

The saturation temperature of the condenser

The liquid line temperature

The suction line temperature

The electrical resistance of the suction line

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HVAC Troubleshooting Quiz

What does the troubleshooting process consist of?

What are superheat and sub-cooling measurements used for in the troubleshooting process?

According to the diagram, what indicates a low pressure condition in the system?

What does a high pressure condition in the system indicate according to the diagram?

What is one of the measurements determined using troubleshooting charts?

What temperature measurement is associated with the evaporator in troubleshooting charts?

Which of the following is NOT a measurement determined by the troubleshooting charts shown?

What can be determined using troubleshooting charts?

Which of the following is NOT mentioned as a component or factor in troubleshooting.

How can it be determined whether the high side pressure is too high or too low?

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