The following published content is available for purchase online at the ASHRAE bookstore

ASHRAE Handbook - Fundamentals - Fundamentals of Control
Automatic HVAC control systems are designed to maintain temperature, humidity, pressure, flow, power, lighting levels, and safe levels of indoor contaminants. Automatic control primarily modulates, stages, or sequences mechanical and electrical equipment to meet load requirements and provide safe operation of the equipment. It can use digital, pneumatic, mechanical, electrical, and electric control devices; human intervention is limited to starting and stopping equipment and adjusting control set points.

ASHRAE Handbook - Applications - Design and Applications of Controls
Automatic control of HVAC systems and equipment usually includes control of temperature, humidity, pressure, and flow rate. Automatic control sequences equipment operation to meet load requirements and provides safe operation of the equipment, using pneumatic, mechanical, electrical, electronic, and direct digital control devices.

Standard 135-2004 - BACnet - A Data Communication Protocol for Building Automation and Control Networks
The purpose of this standard is to define data communication services and protocols for computer equipment used for monitoring and control of HVAC&R and other building systems and to define an abstract, object-oriented representation of information communicated between such equipment, thereby facilitating the application and use of digital control technology in buildings.

Guideline 13-2000 - Specifying Direct Digital Control Systems
The purpose of this guideline is to provide recommendations for developing specifications for direct digital control (DDC) systems in heating, ventilating, and air-conditioning (HVAC) control applications.