HAC 221 - Heating and Air Conditioning Circuits and Controls

 
Description
Green building performance is related to energy usage. HVAC circuits and controls contribute to the efficient use of energy. This course covers the application of elementary two-position control circuits, electronic analog and digital circuits and concludes with an analysis of Display Data Channel (DDC) systems as they relate to the efficient use of energy and comfort.

1. Identify a control system by placing it in one of three major categories.
2. Develop a ladder diagram.
3. Discuss the sequence of operation of a control circuit, based on the ladder diagram.
4. Identify 2 and 3 wire control circuits and interlock circuits.
5. Identify and determine the sequence of operation of timed circuits.
6. Describe the function and sequence of operation of an economizer circuit.
7. Analyze and troubleshoot flame safeguard circuits for gas fired equipment.
8. Determine and discuss the differences between floating and modulating controls.
9. Identify and evaluate the generic devices used for electronic control systems.
10. Develop an analog control system using Invensys devices.
11. Develop both an analog and digital control system using Honeywell devices.
12. Identify and describe DDC system components such as analog input/output, digital input/output, CPU memory, ABS protocols, topologies and architectures.

1. Developing a control system
2. Types of control systems
3. Control system applications: ladder diagrams, 2 and 3 wire control, interlock circuits, timed circuits, economizer circuits, flame safeguard theory, floating and modulating control
4. Electronic control systems: general approach to electronic control schemes, Invensys control schemes, Honeywell control schemes, DDC systems: analog input/output, digital input/output, CPU memory, comparison of digital to analog, ABS protocols, topologies and architectures

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