Optimization of building ventilation by system and zone level action

摘要

A method of selecting a ventilation control strategy from among a plurality of ventilation control strategies. The method comprises the steps of: determining if a CO₂ signal is present and valid; selecting a CO₂ based ventilation control strategy if the CO₂ signal is present and valid; selecting a second ventilation control strategy if the CO₂ signal is not present or is invalid; and operating using the selected strategy. The selection step occurs in a zone controller.