Control Freak: Do Adjustable Temperature Set Points Lead to Wasted Energy?
Too Much Control?
The idea for this month’s topic was hatched during a retro-commissioning project, but it offers lessons to be applied to new construction commissioning. In short, there is such a thing as “too much control” when it comes to offering the building operator opportunities to adjust set points via the central BAS graphics.
I imagine readers are almost universally familiar with the BAS sequence of operations specification language that defines an initial set point value for a control point and then parenthetically makes it clear that the set point is “adjustable.” For example, “The space temperature set point shall be 72°F (adjustable).” This typically implies that the building operator shall have the capability of changing that space temperature set point as deemed appropriate during post construction operation. The means for providing this adjustment is, at a minimum, an editable object on the BAS graphic screen for the conditioned space.