Control sequences for HVAC systems

Learning objectives

1. Learn how to create a successful sequence of operation.
2. Recognize the importance of the sequence of operation as it relates to design, specification, and construction.
3. Understand how the sequence of operation carries forward through commissioning and into the long-term operation of the building.

The sequence of operation is one of the most important design aspects of any HVAC system. Without a proper sequence, the system is left to operate wildly—or not at all. When approached methodically, the process can be broken into smaller segments. We’ll look at the steps required to create a successful sequence of operation using a single-zone variable air volume (VAV) air handling unit serving a convention space. These same steps can be applied to any piece of equipment.

Some information must be gathered before the designer can begin actually creating the sequence of operation. This data gathering and brainstorming process can be broken down into the following major steps…

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