Variable Air Volume Boxes provide zone temperature control for localized areas in a building. Primary air is supplied by an air handler and is regulated by the inlet damper to provide the correct amount of air to the space to meet the desired conditions. Generally, Primary Air serves two purposes: it provides fresh air to the space and is the cooling source for the space.
The core logic of the VAV single duct application provides the default configuration and setup parameters for the zone temperature and flow control sequences. The selection tree also includes options for the following key configurations:
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an Exhaust Box interface to track the flow of the Supply Box to maintain positive or negative pressure in a space
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Fan logic for both Series and Parallel Fan configurations
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Heating Coil interfaces to sequence Box and Baseboard Supplemental Heat
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UL 864 UUKL Smoke Control
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Warmup and Cooldown mode logic interfaces to the building-wide Optimal Start logic
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automated Zone Setpoint shifts based on the Outdoor Air Temperature reset schedule
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CO2 Sensor interface that automatically resets the flow settings for the zone
- N2 compatibility selections that allow you to create an interface similar to the N2 legacy application
- pressure and temperature reset modules and network outputs that can drive a supply air static or discharge air setpoint trim and respond application
The process of commissioning and balancing an application created from the VAV single duct system selection tree is simplified because the tool provides:
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integrated logic that auto-calibrates all flow sensors
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an optional Box Flow Test feature
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the Balancer Override module that interfaces to a specific Network Sensor or the Commissioning Balancer UI (Balancer Tab) for the Balancing Contractor to set the cubic feet per minute (cfm) parameters, box areas, and flow constants.
Once you define the desired temperature and cfm setpoint values for the space, the tool uses patented adaptive control techniques in all of the temperature and flow control loops to continually update all of the tuning parameters.
See the Upgrading System Files section for a list and description of the module and System Selection changes made since the last release of the tool.