• Four Basic Components of refrigeration cycle
• Break down the vapor and liquid lines
• Difference between Sensible heat, Latent Heat, Specific Heat
• Must understand the different states and steps in the refrigeration cycle
• Explain the difference in heat and temperature
• Explain the difference in PSIG and PSIA and pressure scales
• Explain the difference between pressure and force
• Vapor pressure curve in ammonia / saturation tables for ammonia
• Use sensible heat and latent heat formulas to calculate refrigeration loads
• Discuss the duties of a refrigerant operator / technician
• Explain how heat is removed from an area
• Explain how to identify pipe labeling with iiar standards
• Must be able to use the terms: evaporating, condensing, discharge pressure, suction pressure, etc
• Know the types of expansion devices
• Know the difference in absorb heat and rejected heat
• Know pressure drop of line

Refrigerant Properties

• Saturation
• Specific Volume of Refrigeration Vapor
• Sub-Cooling
• Superheat
• Mass flow rate for ammonia
• Handing Refrigerants
• Hydrostatic Expansion of ammonia
• Explain how to detect leaks in a ammonia system
• Explain how refrigerant tables can help in analyzing system performance 

Refrigeration Compressor Types

• Must be able to describe the function and types of compressors in refrigeration systems
• Compression Ratio
• Heat of Compression
• Capacity controls on compressors
• Understand the difference in booster compressor and high stage
• Know the various operating limits of different compressors
• Dynamic displacement compressor
• Positive displacement compressor
• Hermetically sealed compressor
• Semi-hermetic compressor

Lubrication

• Functions of lubricating oil in a refrigeration system
• Understand the importance of, and dangers associated with draining oil
• Describe the properties of refrigerate oils
• Describe the purpose and functions of an oil separator
• List and explain three types of indirect oil cooling systems
• Identify major oil contaminants and describe contamination control in refrigerant oils
• Explain three types of heat exchangers in lubrication

Cooling Units

• Must understand difference in defrost cycle-hot gas defrost-air defrost, etc
• Describe the operation of the evaporator
• Describe the heat exchanger process for air and liquid cooling
• Describe the reason and process for defrosting coils

Condensers and Receivers

• Know the difference in wet bulb temperature vs. dry bulb temperature
• Discuss high pressure receiver functions and types
• Explain the three major types of condensers
• Describe the purpose and function of the condenser
• Describe the operational service & maintenance required of the condenser types
• List advantages to the use of evaporative condensers over other condenser types
• Describe the purpose and function of receivers

Purging

• Non-condensable gasses
• Explain the problems associated with non-condensable gasses
• Discuss the source of non-condensable gasses
• Various types of purgers and how they operate
• Describe symptoms indicating air in an ammonia refrigeration systems