Variable Frequency Drives (VFD)
Replacement Phase-2
C800978 | N06567
Tyler Salisbury
AV-PMG
Item No. XX
June 27, 2023
Item No. 8f_supp
Meeting Date: June 27, 2023
Project Scope
2
Replacement of the oldest and obsolete VFDs that are beyond their useful lives.
VFD (Variable Frequency Drive) is an energy conservation device that modulates the
HVAC fans, pumps, cooling towers, etc. and allows for better occupancy comfort.
Project Justification
• The VFDs are obsolete and are no longer supported by the manufacturer.
• Failure of a VFD will cause HVAC or plumbing system to become non-operational,
resulting in loss of ventilation air flow, temperature control, or water flow.
• Manual HVAC control (VFD failure) will result in poor passenger comfort and
increased energy consumption, as well as security issues if building pressurization
affects door operation.
• The VFDs with the highest risk of failure have been prioritized for this project.
• VFDs save energy by modulating motor speeds to meet real-time demand.
3
Schedule
4
2022 2023 2024 2025 2026
Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3
PLANNING
SD EXECUTED
DESIGN
CONSTRUCTION
Cx Design
Cx Construction Substantial Completion
Budget
5
Description Original Budget
(Status 2)
New Budget Total Change
Major Construction Direct Costs $1,175,000 $3,441,268 $2,266,268
Other Direct Costs & Construction Contingency $1,798,000 $3,479,000 $1,681,000
PMG & Other Soft Costs $1,327,000 $2,616,000 $1,289,000
Project Contingency - $954,000 $954,000
Total Estimated Cost $4,300,000 $10,490,268 $6,190,268
Total: $10,490,268 – Rnd $10.5M
Requested Authorization
Authorization Project Phase Amount
Previous Authorizations Notebook $115,000
Current request for Authorization Design $2,500,000
Total authorizations, including this
request
Notebook + Design $2,615,000
Remaining amount to be authorized Construction + Closeout $7,875,268
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Total: $10,490,268 – Rnd $10.5M
Risks
7
Risk Impact Probability Mitigation Plan
VFDs to be replaced have been
approximated to 70, final count and
selection might change based on the
requirement and design criteria. The project
will aim to finish within budget even if the
count varies.
Risk will be accepted and monitored to avoid any
delay to the schedule. Increased overall project
contingency to 10% along with increasing design
development allowances to mitigate this risk. The
project team (PM, F&I) along with the design
team is responsible to finalize the selection and
count of VFDs.
16 weeks lead time to delivery for required
matrix industrial drives (VFDs) in 2023 which
was 54 weeks in 2022.
Owner Furnished Equipment approach was
initially planned during Acquisitions Planning
meeting in October 2022. Since the lead times for
VFDs are trending to reduce, Owner Furnished
Equipment was rescinded during Acquisitions
Planning meeting in May 2023.
Cone of Certainty
8
We are here
Requesting
• Commission authorization for $2,500,000 to prepare design
and construction bid documents.
• Approval to increase the project budget to a total estimated
$10,500,000.
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QUESTIONS?
10
