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Demand-Controlled Ventilation

Demand-Controlled Ventilation (DCV) uses the building automation system (BAS) to adjust outdoor airflow to match building occupancy and saves energy. It is required by the International Energy Conservation Code (IECC) and ASHRAE 90.1 for spaces over 500 square feet with occupant density of 10 people per 1000 square feet. In this session, we will introduce occupancy-based DCV and CO2-based DCV concepts, and describe DCV components, controls setup, and control sequences recommended in ASHRAE Guideline 36 High-Performance Sequences of Operation for HVAC Systems for single-zone systems.


Air-side economizers are mechanical and control systems intended to utilize cool outside air to reduce building energy consumption. It is required by building energy codes such as International Energy Conservation Code, ASHRAE 90.1, and California Title 24. In this session, we will explain economizer concepts, describe controls setup, and learn when and how to apply air-side economizers. Industry best practice on implementing economizers will also be introduced. Detailed air-side economizer control sequences will be illustrated trough animation and a control programming example.