PREFACE Every building and control system is different from all others, making it an impossibility to foresee each situation you will face in the field. The training is intended to allow one to understand the operational range relating to each type of component and present control concepts as simply as possible. The performance of each control set up depends on the quality of the design and commissioning. The responsibility of each system rests on the persons working directly with the system. Normally the end sequence can be achieved by more than one combination of control components. Typically an assessment of the existing control system determines the best approach in retrofitting a system from a cost point, using as much of the existing components as possible. You must have a clear vision of the final performance level for your system considering safety, health, comfort, energy, etc. You must assure that the system has all information available that would allow good decisions with your performance goal in mind. You must also assure that the control system has proper control over all the functions required to achieve the performance level desired. Under any set of conditions the control system should position devices identically to what an intelligent person would do, if manually operating the mechanical system. The most positive assessment is via directly viewing the dampers, valves, etc. Computer screen shots, via the BAS, if the sensors are calibrated properly, can be a means of identifying illogical control situations. Look at them thoughtfully. The logic in this text is presented with pneumatic controls; however, it equally applies to DDC, electronic and manual control of mechanical HVAC systems. A nightschool class, comprised of experienced HVAC Professional Engineers and control service mechanics, retrofitted a school’s control system, based on the logic in this course. They reduced the gas consumption by 50% and the electrical consumption by 27%, translating to an annual reduction of 248 tons of carbon dioxide not entering the atmosphere, as well as the other pollutants associated with combustion of fossil fuels. The project represented about one person-week of work, eliminating the equivalent pollution of approximately thirteen North Americans for one year. During your career you may easily eliminate an impact equaling thousands of person-years of pollution. The United Nations scientists stated publicly in 2018 that we have less than twelve years to find real solutions to burning fossil fuels, producing greenhouse gasses. You can be a contributing factor in producing solutions, addressing climate change. i
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