Newly revised, this edition has been updated with a new chapter which discusses the installations and procedures required to update an existing pneumatic control system to a hybrid pneumatic and direct digital (DDC) system by adding DDC signal sensing and control algorithms to existing pneumatic actuators on dampers and valves. Aimed at those responsible for operating and maintaining pneumatic control systems, this book is a hands-on guide which fully addresses the latest developments in O&M- related controls technology, from equipment characteristics and operating, to troubleshooting and maintenance, to training of operating and maintenance personnel. The full range of topics pertinent to the effective operation of all types of HVAC controls systems currently in use today is explored. The book provides information on energy saving technology in HVAC plus the latest operation and maintenance criteria. HVAC equipment-to-control interactions, operating and maintaining HVAC control systems, mathematics of control systems, performance predictions, HVAC control system set-up, maintaining electric and electronic control systems, maintaining pneumatic control systems and local loop to BAS interfaces, checkout procedures, fine tuning for pneumatic control systems, operating ATC systems, training, operating and testing DDC systems, psychometrics, and installing hybrid pneumatic and DDC systems.