A typical way to obtain the knowledge and abilities would be: Four years of increasingly responsible work experience as a repair technician or closely related classification with responsibility for the installation, operation, maintenance, and repair of heating, air conditioning, electrical, ventilating, high and low pressure boilers, and similar systems, including two years working with programmable digital controls, such as, but not limited to Direct Digital Controls including Barber-Colman, Invensis, Tridium, and Johnson Metasys systems. Two years of work experience as a repair technician or closely related classification with responsibility for the installation, operation, maintenance, and repair of heating, air conditioning, electrical, ventilating, high and low pressure boilers, and similar systems.