HCR 803 - Environmental Controls

1. Analyze Indoor Air Quality
   1. Define the meaning of indoor air quality (IAQ).
   2. State the HVAC/R Technicians role as it relates to IAQ
   3. Identify various pollutants and pollutant pathways that impact IAQ
   4. List several tools and instruments to help measure and evaluate IAQ
   5. Explain appropriate strategies to prevent, control and resolve IAQ issues.
   6. Explain IAQ as defined by ASHRAE Standard 62
2. Analyze air temperature and its effects.
   1. Discuss the factors affecting human comfort.
   2. List the ways the body dissipates heat.
   3. Explain the relationship between dry bulb, wet bulb, and dew point temperatures
   4. Plot points on the psychometric chart given any two variables
   5. Calculate the mixed air temperature of two different temperature airstreams.
3. Analyze the principles of zoning and zone control.
   1. Explain the purpose of zone control systems.
   2. List the methods used to control excess airflow in a zone system
   3. Explain the purpose of variable air volume control systems
   4. Describe the operation of a basic zone control system
   5. List the components commonly used in a zone control system
   6. Explain the difference between a basic zone control system and a communicating system
4. Demonstrate an understanding of the differences between residential and commercial applications.
   1. Explain the differences between residential, commercial and industrial air conditioning
   2. List the different types of commercial air-conditioning applications
   3. Identify which type of equipment configuration best suits each commercial
   4. application
   5. List the basic chilled-water system compressor and condenser types
   6. Describe the differences between single packaged conditioners and rooftop units
5. Analyze fan and air handling units.
   1. Describe the different types of air handlers
   2. Explain the operation of a fan coil unit
   3. List the different types of heating and cooling coils
   4. Identify types of fans and describe their uses
   5. Use the fan laws to predict the end result of changing fan speed, air volume static pressure difference or fan horsepower
   6. Describe the operation of economizers and energy recovery ventilation sections
6. Evaluate the applications of constant volume rooftop units versus variable air volume units.
   1. List the differences between a constant volume rooftop and a variable air volume rooftop
   2. Describe the major components of a VAV rooftop unit and system
   3. Discuss the use of an exhaust fan versus a return fan on a VAV rooftop unit
   4. Discuss typical candidate buildings for VAV rooftop systems
   5. Describe three types of VAV terminals used with VAV rooftop units
   6. Describe the capabilities of a variable air volume rooftop
7. Analyze commercial control systems.
   1. Explain how a chilled-water system operates
   2. List the common temperature input signals for a packaged air handler
   3. Describe the function of air-quality and air-condition sensors
   4. Describe how water or steam coil control valves operate
   5. Explain the differences and advantages of different types of control systems
8. Demonstrate the ability to complete a home energy audit.
   1. Evaluating heating and cooling systems
   2. Baseload measures
   3. Health and Safety