VARIABLE FREQUENCY DRIVES (VFDS)
VARIABLE FREQUENCY DRIVE (VFD) Requirements: • Complete Table H of the “HVAC Incentive Catalog Supplemental Data Sheet” for this measure. • For the “VFD Application” column, enter “Chilled Water Distribution Pump,” “HVAC Heating Pump,” “Process Pump,” “Pool Pump,” “Boiler Draft Fan,” “Cooling Tower Fan,” “HVAC Fan,” or “Process Fan.” • For the “Controls Before VFD” column, enter “Outlet Control Valve,” “Bypass Valve,” “Discharge Damper,” “Inlet Guide Vanes,” “On/Off,” “None,” or “Other” and then describe. • The individual motors controlled by the VFD must operate a minimum of 2,000 hours annually and may not exceed 500 horsepower. VFDs controlling motors larger than 500 HP or that run <2,000 hours annually may be eligible for a custom incentive. • VFD speed must be automatically controlled by differential pressure, flow, temperature, or other variable signal. • VFDs added to chillers, kitchen ventilation hoods, and air compressors do not qualify for this incentive. Refer to “Cooling Systems” section of this catalog if installing a chiller with a VFD, Process Systems Incentive Catalog if installing a Variable Speed Drive air compressor, or apply for a custom incentive if installing a VFD somewhere else. • VFD must be installed on a centrifugal or axial flow pump or fan, i.e., a variable torque load. • Staged air volume systems (using a VFD to achieve two-speed fan control on a rooftop unit) are not eligible but may be eligible for a custom incentive. • For constant torque and variable torque VFD incentives for industrial and process uses, see the Variable Frequency Drive section of the Process Systems Incentive Catalog. • For VFDs for agribusiness equipment, see the Agribusiness Incentive Catalog. 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 an existing variable frequency drive (VFD) does not qualify. VFDs may not be beneficial in pump systems where static head makes up a large portion of the total system head. It is also important that the load on the system vary over time to take advantage of the savings that a VFD can provide. Be sure to understand these aspects of your system and discuss them with the equipment vendor in advance of applying VFD technology.
EQUIPMENT UPGRADES AND RETROFITS Measure Description
Code
Incentive
Unit
Variable Torque VFD, Boiler Draft Fan
H2640*
$40 $40 $40 $40 $40 $40
HP HP HP HP HP HP
Variable Torque VFD, Cooling Tower Fan
H2641*
Variable Torque VFD, HVAC Fan
H2643* H2726* H2644* H2646*
Variable Torque VFD, Chilled Water Distribution Pump
Variable Torque VFD, HVAC Heating Pump Variable Torque VFD, Pool Pump Motor * Supplemental Data Sheet needed
NEW CONSTRUCTION AND MAJOR RENOVATIONS Measure Description
Code
Incentive
Unit
Variable Torque VFD, Boiler Draft Fan
N-H2640* N-H2646*
$30 $30
HP HP
Variable Torque VFD, Pool Pump Motor * Supplemental Data Sheet needed
28
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