Although HVAC systems are carefully designed, factors such as job conditions, substituted equipment, variations in workmanship, and changing load conditions created a requirement that the air and hydronic systems had to be tested and balanced in order for the system to operate satisfactorily. Unfortunately, most testing and balancing work was haphazard and poorly executed, creating a need for trained testing, adjusting, and balancing (TAB) personnel who could provide professional and accurate work for the HVAC industry. Sets out what the engineers need to know about testing and balancing, including standards, national recognised programmes, specifications and drawings, award of work, system deficiencies, procedures, test instruments, reports and acceptance. Concludes with questions and answers.

KEYWORDS: engineers, testing, regulating, building services, heating, ventilation, air conditioning, training, personnel.