B 486 HVAC Repair Questions_1 (002).pdf
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- Attached to
- Repair HVAC Bldg. 486
- Solicitation number
- FGWB250003
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This document is a set of Questions and Answers (Q&A) for a B 486 HVAC Repair project involving the replacement of a 10-ton HVAC unit with a new 5-ton unit. The Q&A addresses critical technical details including ductwork installation, conduit routing, floor protection, point of connection specifications, and testing requirements. Key clarifications include: conduit can be run outside the exterior wall (subject to code requirements), ductwork must be built to Smacna standards, man lifts are allowed on the weight room floor with floor protection responsibility, and an existing duct smoke detector can be retained if undamaged. The project requires a Performance Verification Test (PVT) to confirm proper unit operation and integration with the existing Utility Monitoring Control System, with references to the Dobbins Design Guide for control requirements. Additional notes specify that factory startup is only required if mandated by the manufacturer, and referenced images will be attached to an amendment.
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B 486 HVAC Repair Questions
1. Question: Drawing of the existing ductwork in crawl space that new ductwork must be tied into.
a. Answer: There is no crawl space.
2. Can conduit be run outside the exterior wall from the old unit to the new unit location?
a. Answer: Yes, all work must be in accordance with all applicable code requirements.
3. Specifications of new 5TON unit ductwork.
a. Answer: Ductwork must be built to Smacna standards and sized to the unit the contractor is submitting.
4. Will a man lift or scaffolding be allowed on the weight room floor?
a. Answer: Yes, but the contractor will be responsible for protecting the floor. Any damage caused by the contractor will be repaired, to Government’s approval, at the contractor’s expense.
5. Please provide distance to the point of connection to the existing duct that the newly installed 5 ton package unit will be connected to.
a. Answer: Both images 486.2 and 486.3 have a scale.
6. Is there adequate space above ceiling to install new duct to the point of connection without making modifications to existing conduits, duct, trusses, etc.?
a. Answer: Unknown
7. The new HVAC unit is being downsized from 10 to 5 tons and SOW requires PVT testing. What are the design requirements that the unit must be to verify during testing?
a. Answer: The PVT is to confirm proper operation of the unit and graphics all the way back to the existing Utility Monitoring Control System. The Dobbins Design Guide has the controls requirements. Unit requirements are and an example are in the Statement of Work.
8. Will T&B be required for PVT requirements? If so, please provide design data to achieve T&B.
a. Answer: No T&B will be required.
9. If design data cannot be provided, should engineering be included to establish an approved design for testing and balance?
a. Answer: No T&B is required.
10. Is there an existing duct smoke detector installed on the existing 10-ton unit? If so, the new 5-ton unit will not require the installation of the duct smoke detector, will the removal of existing duct smoke detector require any additional Fire Alarm testing or re-certifications?
a. Answer: There is an existing duct mounted smoke detector installed and it is sufficient for the new unit as long as it is not damaged or removed in the process of completing this work.
11. Is factory startup required?
a. Answer: Only, if required by manufacture.
12. Please provide the images referenced in the statement of work.
a. Attached to Amendment.
13. Request clarification regarding the images labeled Fig. 486.1 and 486.3
a. Answer: See the photos
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