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Chapter 4 Control Principles

Chapter 4 Control Principles. Control System Components • Sensors • Controllers • Controlled Devices • Control Agents • Control Functions • Control System Characteristics • Closed Loop Control • Open Loop Control • ON/OFF Control • Proportional Control • Control System Requirements. Competencies.

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Chapter 4 Control Principles

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  1. Chapter 4Control Principles Control System Components • Sensors • Controllers • Controlled Devices•Control Agents•Control Functions• Control System Characteristics • Closed Loop Control • Open Loop Control • ON/OFF Control • Proportional Control • Control System Requirements

  2. Competencies List and describe common HVAC control system components. Compare common control system components found in heating, cooling, humidification, and ventilation systems. List and describe common methods used to control temperature, humidity, and pressure. Identify common control system characteristics. Describe common control system arrangements. Identify common control system requirements.

  3. HVAC control system components • sensor • controller • controlled device • control agent

  4. Comparison of HVAC control system components • Heating systems • hot water, steam, electric heating elements, or combustion • Cooling systems • chilled water, direct expansion cooling or outside air • Humidification • low-pressure steam, hot water vapor

  5. Controlling temperature, pressure, and humidity • room controller or thermostat • return air sensor or controller • safety controls • humidity sensor or controller • pressure sensor

  6. Control system characteristics • setpoint • control point • offset • feedback

  7. Control system arrangements • closed loop • open loop • ON/OFF • proportional (analog)

  8. Control system requirements • provides safe, automatic and accurate regulation of environmental conditions • poses no immediate risk to building occupant health • operates automatically • accuracy is measured and provided to the customer

  9. Chapter 4 Review What is the function of a controller? to compare a signal to a setpoint value and send an appropriate output signal What is open loop control? no feedback occurring between the controller, sensor, and controlled device

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