VARIABLE FREQUENCY DRIVES
General Requirements: The system controlled must have significant load diversity that will result in savings through motor speed variation. Units installed only to allow soft starts are not eligible. Redundant or backup units do not qualify. Replacement of existing VFDs does not qualify. VARIABLE TORQUE VFDS Requirements: • Complete Table H1 of the “Process Systems Incentive Catalog Supplemental Data Sheet” for this measure. • For the “VFD Application,” enter “Chilled Water Distribution Pump,” “Process Pump,” “Boiler Draft Fan,” “Cooling Tower Fan,” or “Process Fan.” If you are unsure of the application of your VFD, please contact Focus on Energy for assistance. • For the “Controls Before VFD,” enter “Outlet Control Valve,” “Bypass Valve,” “Discharge Damper,” “Inlet Guide Vanes,” “On/Off,” “None,” or “Other” and then describe. • The system using the VFD must operate a minimum of 2,000 hours annually. VFDs controlling motors that run <2,000 hours annually may be eligible for a custom incentive. • If VFD is going on a motor greater than 500 HP, please fill out table H2 to provide the estimated load profile for the piece of equipment. Please also • VFD must be installed on a centrifugal or axial flow pump or fan, i.e., a variable torque load. VFDs may not be beneficial in pump systems where static head makes up a large portion of the total system head. Be sure to understand these aspects of your system and discuss them with the equipment vendor in advance of applying VFD technology. • Staged air volume systems (using a VFD to achieve two-speed fan control on a rooftop unit) are not eligible, but may qualify for a custom incentive. • Refer to HVAC/Plumbing Incentive Catalog for HVAC pumps and fan. VFDs added to chillers and air compressors do not qualify for this incentive. • For VSD vacuum pumps ≤ 30 HP, see Compressed Air and Vacuum section of this catalog. VSD vacuum pumps > 30 HP may qualify for a custom incentive. • For dairy systems vacuum pumps, refer to the Agribusiness Incentive Catalog. EQUIPMENT UPGRADES AND RETROFITS Measure Description Code Incentive Unit VFD, Chilled Water Distribution Pump PS2726* $40 HP VFD, Boiler Draft Fan PS2640* $40 HP VFD, Cooling Tower Fan PS2641* $40 HP VFD, Process Fan PS2647* $40 HP VFD, Process Pump PS2648* $40 HP *Supplemental Data Table needed NEW CONSTRUCTION AND MAJOR RENOVATIONS Measure Description Code Incentive Unit VFD, Chilled Water Distribution Pump N-PS2726* $30 HP VFD, Boiler Draft Fan N-PS2640* $30 HP VFD, Cooling Tower Fan N-PS2641* $30 HP VFD, Process Fan N-PS2647* $30 HP VFD, Process Pump N-PS2648* $30 HP * Supplemental Data Sheet needed CUSTOM PROJECT IDEA provide the motor nameplate efficiency (motor specification or nameplate photo) for large motor over 500 HP. • VFD speed must be automatically controlled by differential pressure, flow, temperature, or other variable signal.
Talk to your Energy Advisor about custom incentives that may be available for reducing motor horsepower in addition to equipping the motor with the VFD. For example, an oversized process pump will be replaced with a properly sized pump and equipped with a VFD.
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