ASHRAE F07-2009 (SI)

Automatic HVAC control systems are designed to maintain temperature, humidity, pressure, energy use, power, lighting levels, and safe levels of indoor contaminants. Automatic control primarily modulates actuators; stages modes of action; or sequences the mechanical and electrical equipment on and off to satisfy load requirements, provide safe equipment operation, and maintain safebuilding contaminant levels. Automatic control systems can use digital, pneumatic, mechanical, electrical, and electronic control devices. Human intervention often involves scheduling equipment operation and adjusting control set points; but also includes tracking trends and programming control logic algorithms to fulfill building needs. This chapter focuses on the fundamental concepts and devices normally used by a control system designer. It covers (1) control fundamentals, including terminology; (2) types of control components;(3) methods of connecting components to form various individual control loops, subsystems, or networks; and (4) commissioning and operation. Chapter 46 of the 2007 ASHRAE HandbookHVAC Applications discusses the design of controls for specific HVAC applications.

Chapter Table of Contents

Terminology
Types of Control Action
Classification by Energy Source
CONTROL COMPONENTS
Controlled Devices
Sensors
Controllers
Auxiliary Control Devices
COMMUNICATION NETWORKS FOR BUILDING AUTOMATION SYSTEMS
Communication Protocols
OSI Network Model
Network Structure
Specifying BAS Networks
Approaches to Interoperability
SPECIFYING DDC SYSTEMS
COMMISSIONING
Tuning

ISBN: 978-1-933742-55-7
ISSN: 1523-7282

Units: SI

Citation: 2009 ASHRAE Handbook -- Fundamentals: Chapter 7, Fundamentals of Control



Product Code(s): D-F072009SI