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GYKCWD NSAP-DLA-3-Repairing Cooling Tower VFD Unit

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Federal

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This project involves the repair or replacement of a Telemcanique Variable Frequency Driver (VFD), model ATV31HD11N4A, located in the B3 3C mechanical room for Cooling Tower 1. The unit is currently inoperable in Auto (AFC) mode and trips at 60Hz, forcing the fan to run in Bypass Mode at full speed. This condition reduces energy efficiency and increases mechanical stress on the system. The VFD is rated for 11kW / 15 HP with an input voltage of 380-500V and is connected to Panel P1-5, Breaker 15. Managed by Navfac Mid-Atlantic for the Department of the Navy, this effort is designated as an 8(a) set-aside under NAICS code 811310. The scope of work requires troubleshooting the existing drive to restore functionality or performing a full unit replacement if repairs are not possible. The project is identified as GYKCWD NSAP-DLA-3-Repairing Cooling Tower VFD Unit and is critical for maintaining proper cooling tower performance.

General Info

Repair or replace Telemcanique VFD for Cooling Tower 1 for Department of Navy.

NAICS

811310 - Commercial and Industrial Machinery and Equipment (except Automotive and Electronic) Repair and Maintenance

Place of Performance

ML: PENNS, USA

Set-Aside

8A

Documents

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Organization & Contact Information

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AgencyDepartment Of The Navy → Navfac Mid-Atlantic
ContactsNo contacts available
OfficeN/A
Office AddressN/A
ContactsNo contact information available

Full Description

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This project is to repair the cooling tower Variable Frequency Drivers (VFDs) in the B3 3C mechanical room in front of chiller #2. The VFD controlling the fan motor for Cooling Tower #1 (located on the South Side) is currently inoperable in Auto (AFC) mode according to a handwritten site note. The issue appears to have been going on since at least 2017 based on the dates written on the note. A photo of the note along with other photos of the cooling tower are attached to this form. The drive trips at 60Hz whenever it's in AFC mode thus requiring it to be kept in Bypass Mode to remain running. In Bypass Mode, the fan operates at full speed without modulation which is less energy efficient and more stressful on the mechanical components. Proper functioning of the VFDs is critical for cooling tower performance and energy efficiency. Corrective repairs or a full unit replacement is recommended A site inspection found that the VFD display shows "nSt" (Not Started) status indicating that the drive is powered but not running. A photo of the display is attached. The VFD is a Telemcanique with a model number of ATV31HD11N4A. It is rated for 11kW / 15 HP. It's input and output voltage are 380-500V and 380-600V respectively. It is connected to Panel - P1 - 5, Breaker - 15. A photo of its specifications is attached. 7. If the drive cannot be restored to functionality after troubleshooting, replace the VFD entirely with a new unit. DATE SUBMITTED: 8/8/25 TF-1#DLA-FY25-032

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