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Topic
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General Description of Subject Matter
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Introduction to Heating, Ventilation, Air Conditioning and Refrigeration
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History Of HVACR, define environmental heating and air conditioning, the importance of a clean background. The types of various jobs in the HVACR industry.
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Safety
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Discuss safety in the HVACR industry; name the major hazards of pressure vessels, steps to take in case of an accident.
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Measurements
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Four physical properties that are commonly measured the basic concept of the SI system. Estimate length and area based on standard building material dimensions.
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Piping and Tubing
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Pipe materials used in HVACR, methods of joining copper tubing. Characteristics of ACR tubing.
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Soldering and Brazing
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Proper clothing and PPE that must be worn during soldering and brazing. Correct procedure for soldering and brazing.
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Refrigerant System Piping
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Installation of refrigerant piping and the modifications required for long line, vertical lift and velocities in lines.
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Properties and Matter
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Characteristics if the three states of matter, why properties of matter are important.
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Types of Energy and their properties
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Difference between potential and kinetic energy, common forms of energy, structure of molecules and atoms.
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Temperature and Measurement and conversion
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The effect that temperature has on a substance, the four types of temperature scales, Fahrenheit, Celsius, Rankin and Kelvin.
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Thermodynamics- the study of Heat
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The first and second laws of thermodynamics, the rate that heat transfers through various materials. Heat energy and temperature, sensible heat and latent heat.
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Pressure and Vacuum
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Relationships between atmospheric pressure, gauge pressure and absolute pressure. How gas responds to changes in temperature, volume and pressure
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Types of Refrigeration Systems
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Different types of cooling systems, fundamental principles behind the compression refrigeration cycle.
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The Refrigeration Cycle
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Fundamental principles behind the refrigeration cycle, the four major components of the compression cycle.
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Compressors
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Identify the major types of compressors, how each type of compressor works. Explain horsepower and compressor capacity.
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Condensers
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How air cooled and water cooled condensers work, types of air cooled and water cooled condensers and their operation
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Metering Devices
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Types of metering devices, operation between fixed and modulating metering devices. Describe how to measure superheat. Operation of balanced port expansion valves.
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Evaporators
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Identify the four broad categories if evaporators and their application. Concepts of sensible and latent cooling as they relate to evaporators. Flooded and direct expansion evaporators.
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Refrigerants and their Properties
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Define refrigerant, type of refrigerant by number designation. Pressure- temperature relationship or saturated refrigerant.
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Special Refrigeration Components
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Identify each special refrigeration system component, purpose of each special refrigeration system component.
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Plotting the Refrigeration Cycle
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How refrigerant heat, pressure and temperature change as refrigerant flows through a refrigeration system. Identify the lines and scales on a PH (pressure enthalpy) diagram.
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