MODIFICATION
41 -- Remove and Replace 4 Glycol Condensing Units
- Notice Date
- 9/14/2009
- Notice Type
- Modification/Amendment
- NAICS
- 238220
— Plumbing, Heating, and Air-Conditioning Contractors
- Contracting Office
- Department of the Air Force, Air Combat Command, 1st CONS, 74 Nealy Avenue, Suite 100, Langley AFB, Virginia, 23665
- ZIP Code
- 23665
- Solicitation Number
- FA4800-09-Q-BD08
- Archive Date
- 10/1/2009
- Point of Contact
- Beverly A. Turman-Dawson, Phone: 7577644918, Steve F Pillo, Phone: 757-764-2930
- E-Mail Address
-
Beverly.Dawson.ctr@langley.af.mil, steven.pillo@langley.af.mil
(Beverly.Dawson.ctr@langley.af.mil, steven.pillo@langley.af.mil)
- Small Business Set-Aside
- Total Small Business
- Description
- Questions from the site visit: • All of the Data Aire units are currently fed with 100 amp 480 breakers located in panel MPP. The wire coming off of these breakers in number 6 thhn which is rated for 75 amps per table 310-16(NEC)using the 90 degree scale. These breakers should be changed out to correctly protect the wiring per code or the wiring changed out to correctly match the breaker. Please advise corrective action. If the wiring is increased the disconnect switches located at each unit should be changed out to fusible disconnects and fused accordingly at the units • The disconnect switches located on the roof at the existing condensing units are weathered and should be replaced accordingly with the new units. The existing switches are rated for 480 volt 30 amp. Please advise corrective action Response to questions from the site visit: We pulled information from the Data Aire website for the planned model specified in the SOW (DAGD-1634). The electric reheat option should be included. Including this option affects the circuits to each unit. As a result, if contractors provide the DAGD-1634, you must adhere to the requirements Data Aire as for circuit protection. According to the Data Aire sales brochure, this unit needs a circuit that can handle 52 FLA (full load amps), with an MCA (minimum circuit amperage) of 63A, and an MFS (max. overcurrent protection) device of 70A. Because of the MCA, the existing #6 will need to be replaced with #4 CU using the 60 degree C ampacity. Do not use the 75 or 90 degree numbers unless both conductors AND terminations are rated for that temperature. The existing disconnects need to be replaced with fused disconnects, with fuses rated no larger than the MOP of 70A. The existing 100A breakers need to be reviewed to see if they meet NEC Article 430. It may be okay to leave them as is. For the roof condensers, a contractor needs to include in his proposal necessary replacement of any of the components making up the existing electrical circuits. This shall be according to the electrical requirements of the equipment manufacturer. Existing disconnects should be replaced due to the weathering. Additional information: Please submit two (2) quotes Opt 1) The first will be for the removal and replacement of 2 units. Opt. 2) The second will be for the removal and replacement of 4 units. Special Note: Each unit shall be removed and replaced completely prior to removing and replacing another unit. Bid Bonds are not required for this project.
- Web Link
-
FBO.gov Permalink
(https://www.fbo.gov/spg/USAF/ACC/1CONS/FA4800-09-Q-BD08/listing.html)
- Place of Performance
- Address: Bldg 25, Langley AFB, Virginia, 23665, United States
- Zip Code: 23665
- Zip Code: 23665
- Record
- SN01953145-W 20090916/090915000036-59dbff1875e27eddfe6c4f819b38f30e (fbodaily.com)
- Source
-
FedBizOpps Link to This Notice
(may not be valid after Archive Date)
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