The one topic contractors always seem to have strong opinions about is controls. That isn’t surprising, given the vast number of controls a contractor needs to know about.
Just consider a rooftop unit for instance. The on-board controls there will operate the various components in the unit, such as the dampers, motors, variable- speed drives, heat options, and valves. Learning about every sequence can be a formidable task, but installing these controls in the field can be a nightmare.