Variable Frequency Drives for Fans
In stock
$0.00
This incentive is available for installing Variable Frequency Drives (VFDs) on existing HVAC fans to improve efficiency by matching motor speed to system demand.
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Required Documentation:
- Proof of baseline operation.
- Control sequence showing VFD tied to variable; signal (differential pressure, flow, temperature etc.)
For retro-commissioning:
- Existing case: Documentation (e.g., EMS screenshots, trend data, functional testing) showing VFD operating at fixed speed.
- Proposed case: Documentation (e.g., EMS screenshots, sequence of operations, as-built design documents) showing VFD operating at variable speeds.
Important Consideration:
- New chillers with integrated VFDs may qualify under the chiller incentive instead.
- Applicability: Eligible for retrofit projects.
- Baseline Efficiency: Existing HVAC fans with throttling devices or constant speed operation. Motor must operate more than 2,000 annual hours.
- Qualifying Efficiency Requirement:
- Installation of VFDs must include permanent removal or disabling of throttling devices (inlet vanes, bypass dampers, bypass valves, throttling valves).
- VFD speed must be automatically controlled by differential pressure, flow, temperature or other variable signals.
- Exclusions:
- Redundant or backup units.
- New chillers (with or without integrated VFDs}.
- Replacement of existing VFDs. o Existing two-speed cooling tower motors retrofitted with VFDs.
- New cooling towers.
- New HVAC fans or AHUs (per ASHRAE 90.1-2013).
- New HVAC hydronic pumps >10 HP system power (per ASHRAE 90.1-2013).