Official Course Description: MCCCD Approval: 11/22/94
ABC209 19952-20046	LEC	2 Credit(s)	2 Period(s)
Principles of HVAC and Air Flow
Terminology and components of Heating, Ventilation and Air Conditioning (HVAC) systems and the principles of air flow as applied to HVAC air distribution systems. Also covers the basic refrigeration cycle, components and controls and the introduction to heat pumps. Prerequisites: Indentured status with Associated Builders and Contractors, Inc., or permission of the apprenticeship coordinator.

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MCCCD Official Course Competencies:
ABC209   19952-20046	Principles of HVAC and Air Flow

1.	List basic definitions for air conditioning systems and list specific pieces of equipment that comprise an HVAC air distribution system and describe the function and operation of each. (I)
2.	Identify the components of air-handling units, including factors for selection, and describe the function of each. (II)
3.	Identify specific internal and external factors that affect conditioned air. (III)
4.	Identify specific types of diffusers and list their performance characteristics. (IV)
5.	Describe the function of airflow in a duct system and calculate the total pressure in a duct system. (V)
6.	Describe specific fan performance requirements. (VI)
7.	Explain the principle causes and effects of duct losses within a HVAC system and calculate specific duct signing methods. (VII)
8.	Describe specific fitting and design standards and define proportionate airflow splitting. (VIII)
9.	Explain how human comfort aspects affect the air-conditioning process. (IX)
10.	List the basic principles of the refrigeration cycle, name its components and identify the basic cycle controls. (X)
11.	Describe the functioning of specific heat pumps. (XI)

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MCCCD Official Course Outline:
ABC209   19952-20046	Principles of HVAC and Air Flow

I. HVAC Terminology and Air-Distribution System Equipment A. HVAC terminology 1. Heat 2. Cold 3. Refrigeration 4. Mechanical refrigeration 5. Refrigerants-thermodynamic and physical properties B. Heating equipment 1. Warm-air furnaces 2. Duct heaters 3. Unit heaters 4. Heat wheels C. Cooling equipment 1. Direct expansion coils 2. Chilled water coils 3. Air-handling units II. Air-Handling Systems A. Heating medium 1. Unit type 2. Location 3. Sound level 4. Temperature control B. Rooftop units C. Fans D. Air devices E. Grilles F. Registers G. Diffusers H. Dampers I. Air filters J. Dust collectors K. Humidifiers III. Factors Affecting Conditioned Air A. Temperature B. Humidity C. Air quality D. Air motion IV. Diffuser Selection A. Throw B. Drop C. Spread D. Noise E. Velocity/pressure drop V. Airflow A. Fan B. Pressure 1. Static 2. Velocity 3. Total C. Water gauge D. Total Pressure VI. Fan Performance A. External static pressure B. Airflow pressure C. Resistance D. Duct and diffuser sizes E. Volume dampers VII. Duct Losses A. Friction B. Turbulence C. Velocity-friction/air quantity D. Fitting Losses E. Duct Sizing Methods 1. Velocity reduction 2. Static regain 3. Equal friction 4. Calculations VIII. Fitting and Design Standards A. Offsets B. Elbows C. Proportionate Airflow in Split Fittings 1. Exact split by Cubic Feet/Minute (CFM) 2. Approximate split by duct size 3. Wye fittings IX. Human Physical Comfort A. Convection B. Radiation C. Evaporation D. Temperature and humidity X. Basic Refrigeration Cycle A. Components - purposes and functions 1. Cooling coil or evaporator 2. Compressor 3. Condenser 4. Expansion valve B. Compressors C. Reciprocating Compressors 1. Open type 2. Semi-hermetic 3. Welded hermetic D. Expansion valves 1. Thermostatic 2. Capillary tube E. Basic Cycle Controls 1. Primary 2. Secondary XI. Heat Pumps A. Air-to-air heat pumps B. Equipment C. Location D. Function

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