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Questions and Answers
What is the primary purpose of vibration absorbers in refrigeration systems?
What is the primary purpose of vibration absorbers in refrigeration systems?
Where should vibration absorbers be installed for maximum effectiveness?
Where should vibration absorbers be installed for maximum effectiveness?
What factors influence the type of piping and tubing material used in refrigeration systems?
What factors influence the type of piping and tubing material used in refrigeration systems?
According to CSA Standard B52, what must piping, tubing, and related components comply with?
According to CSA Standard B52, what must piping, tubing, and related components comply with?
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Which component is responsible for creating noise and vibration in refrigeration systems?
Which component is responsible for creating noise and vibration in refrigeration systems?
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Why might the noise in a refrigeration system become objectionable?
Why might the noise in a refrigeration system become objectionable?
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What does the exploded view of a liquid refrigerant distributor illustrate?
What does the exploded view of a liquid refrigerant distributor illustrate?
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In refrigeration systems, what component connects the refrigerant piping to the compressor?
In refrigeration systems, what component connects the refrigerant piping to the compressor?
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What is the minimum operational time for the unit before starting the compressor?
What is the minimum operational time for the unit before starting the compressor?
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If the compressor has a separate oil pump, what is the minimum operational time for this pump before starting the compressor?
If the compressor has a separate oil pump, what is the minimum operational time for this pump before starting the compressor?
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What happens if the return chilled water temperature is at or above the cut-in setpoint?
What happens if the return chilled water temperature is at or above the cut-in setpoint?
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What is the primary function of the drying agent in the filter-drier?
What is the primary function of the drying agent in the filter-drier?
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What is the purpose of holding the inlet damper or vanes in a closed position during the starting sequence?
What is the purpose of holding the inlet damper or vanes in a closed position during the starting sequence?
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After the compressor reaches normal speed, what controls the damper or vane operator?
After the compressor reaches normal speed, what controls the damper or vane operator?
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Under what condition should the filter-drier be replaced?
Under what condition should the filter-drier be replaced?
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What should be checked continually for the first 30 minutes after the compressor starts?
What should be checked continually for the first 30 minutes after the compressor starts?
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What change indicates the presence of moisture in the refrigerant?
What change indicates the presence of moisture in the refrigerant?
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Which type of desiccant is used to remove moisture through chemical action?
Which type of desiccant is used to remove moisture through chemical action?
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What action is taken if all protective controls are energized during startup?
What action is taken if all protective controls are energized during startup?
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What is the first step in the startup procedure after ensuring the unit is ready?
What is the first step in the startup procedure after ensuring the unit is ready?
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Which of the following statements about the sight glass is true?
Which of the following statements about the sight glass is true?
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Where is the ideal location for installing a sight glass to determine if the system is fully charged?
Where is the ideal location for installing a sight glass to determine if the system is fully charged?
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What does the presence of vapor bubbles in the sight glass indicate?
What does the presence of vapor bubbles in the sight glass indicate?
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Which component changes color in the presence of moisture within the refrigerant system?
Which component changes color in the presence of moisture within the refrigerant system?
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What should be done first to initiate the refrigerant charging process?
What should be done first to initiate the refrigerant charging process?
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To charge an ammonia refrigeration system, how should gas be fed into the system?
To charge an ammonia refrigeration system, how should gas be fed into the system?
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What pressure should the system reach for the compressor to start after charging?
What pressure should the system reach for the compressor to start after charging?
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What is indicated by frosting on the compressor suction line in small refrigeration systems?
What is indicated by frosting on the compressor suction line in small refrigeration systems?
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What should be monitored to determine if additional refrigerant is required?
What should be monitored to determine if additional refrigerant is required?
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What is the purpose of increasing the system load while charging refrigerant?
What is the purpose of increasing the system load while charging refrigerant?
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When should the liquid shutoff valve be opened during the charging procedure?
When should the liquid shutoff valve be opened during the charging procedure?
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How can the correct amount of refrigerant to add to the system be determined?
How can the correct amount of refrigerant to add to the system be determined?
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What can occur if liquid refrigerant is forced into the compressor?
What can occur if liquid refrigerant is forced into the compressor?
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How should refrigerant generally be added to a compressor?
How should refrigerant generally be added to a compressor?
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Which tool is commonly used to add oil to a refrigeration compressor?
Which tool is commonly used to add oil to a refrigeration compressor?
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What must be ensured when adding oil to a refrigeration compressor?
What must be ensured when adding oil to a refrigeration compressor?
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What should be checked before disconnecting the charging line from the refrigeration system?
What should be checked before disconnecting the charging line from the refrigeration system?
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What is the typical normal oil level in the bull’s eye gauge glasses of a refrigeration compressor?
What is the typical normal oil level in the bull’s eye gauge glasses of a refrigeration compressor?
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Why is adding oil to an in-service refrigeration compressor considered dangerous?
Why is adding oil to an in-service refrigeration compressor considered dangerous?
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What can gradually happen to the oil level in refrigeration compressors over time?
What can gradually happen to the oil level in refrigeration compressors over time?
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What is the first step to take if the oil level is low?
What is the first step to take if the oil level is low?
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What is a required condition for adding oil while the compressor is in operation?
What is a required condition for adding oil while the compressor is in operation?
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Which of the following precautions should be taken when adding oil?
Which of the following precautions should be taken when adding oil?
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What is the purpose of bleeding off air before attaching the hose to the compressor oil charging valve?
What is the purpose of bleeding off air before attaching the hose to the compressor oil charging valve?
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What should be done after the oil charging is complete?
What should be done after the oil charging is complete?
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What must be ensured before using the compressor suction to draw oil into the crankcase?
What must be ensured before using the compressor suction to draw oil into the crankcase?
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Which valve must be open while operating the hand pump to charge oil?
Which valve must be open while operating the hand pump to charge oil?
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What does the figure showing the oil return system likely illustrate?
What does the figure showing the oil return system likely illustrate?
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Study Notes
Learning Outcome
- Describe the operating principles and maintenance of a refrigeration system.
Learning Objectives
- Discuss refrigeration auxiliaries
- Describe refrigeration system leak test procedures
- Describe how a refrigeration system is dried and charged prior to start-up
- List the steps for adding oil to an in-service refrigeration compressor
- Describe the start-up and shut-down procedure for a compression refrigeration system
- Describe operational log sheets and preventative maintenance procedures for refrigeration systems
- Describe how a refrigeration system is purged of noncondensable gases
- Discuss refrigeration condenser operation and maintenance requirements
- Explain typical problems and resolutions related to refrigeration systems
Chapter Introduction
- Power Engineers need to know refrigeration system layouts and types of equipment
- Understanding components' functions are crucial for safe and economical operation
- Professionals must be familiar with relevant codes and standards (e.g., CSA B52, ASME B31.5, IIAR)
- Manufacturer's websites provide essential system-specific info for operation, maintenance, and troubleshooting
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Description
This quiz covers the essential operating principles and maintenance practices for refrigeration systems. Participants will explore topics such as leak testing, system charging, oil addition, and preventative maintenance procedures. Understanding these concepts is vital for safe and efficient refrigeration operations.
