Enhanced Ventilation Control
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This incentive is available for the upgrade of single-zone constant
volume rooftop units by integrating a control system that combines
an advanced digital economizer controller, a supply fan VFD, and a
demand-controlled ventilation system.
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Required Documentation:
• Proof of Existing System: Documentation or verification showing the current setup as a single-zone constant volume system without VFD, DCV, or economizer controls. As well as, the capacity of the rooftop heating system, usually in BTU/hr.
• Implementation Details: Detailed specifications and installation records for the new control system, including economizer controls, DCV mechanism, and supply fan VFD.
• Applicability: Eligible for upgrades of existing single-zone constant
volume systems that currently lack VFDs, demand control ventilation,
and economizer controls and new construction projects.
• Baseline Efficiency: The baseline system assumes a non-functioning
economizer, outdoor air set at the code value for maximum
occupancy, and a constant speed supply fan.
• Qualifying Efficiency Requirement:
- The new advanced system must include the installation of
functional economizer controls.
- Also, A DCV control mechanism, typically employing CO2 sensors,
must be installed to adjust the volume of ventilated air based on
real-time occupancy levels.
- Furthermore, A VFD must be added to the supply fan, allowing for
speed adjustments during periods of reduced demand.
• Exclusions:
- Cannot be combined with separate measures for DCV, conversion from CAV to VAV on AHU, VFD on HVAC fans, or standalone airside economizer projects.