Another HVAC Compliance Question

First, I'd push back a bit. If you have a system over 10,000 CFM, implementing optimal start is usually a very quick payback item. And if you are less than 10,000 CFM, the requirement (6.4.3.3.3) does not apply. Now, having said that, it is my understanding that the mandatory measures generally do not apply to existing equipment. Section 2 of the Standard ("Scope") indicates that the standard only applies to: "1. new buildings and their systems 2. new portions of buildings and their systems 3. new systems and equipment in existing buildings. " However, if you are doing an energy model, the baseline building model needs to include all mandatory provisions, including the optimal start. My advice - pay the $2 - put in the optimal start controls,