6973GH-20-R-00085 Question and Answers 2.docx
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Questions & Answers on SIR 6973GH-20-R-00085:
HVAC System Upgrade at the AGS ASR Facility located in Augusta, GA
Q. Are you specifying any mechanical controls manufacturer or is that up to the contractor as long as it meets requirements laid out in the Mechanical Control Systems drawing AGS-1504022-M003?
A. The contractor has the option to propose any controls manufacturer. The final approval is the decision of the FAA. There have been issues with past project where the controls contractor has not recognized the DDC system is required to have an open front end (JACE), similar to Tridium Niagara.
Q. Equipment schedule - the basis of design is a Trane 12.5 ton rooftop unit, however for specified cooling loads it shows 120,000 which would be 10-tons. Please confirm A. Please provide the 12.5-Ton unit as scheduled on the drawings.
Q. Do the existing equipment pads need to be removed and replaced, repaired, or enlarged?
A. The existing equipment pad is to be reused in its existing condition. There is no work associated with the pad.
Q. Will the ceiling(s) need to be removed or modified?
A. The ductwork routes below the ceiling. There is no anticipated ceiling work. As an FYI, the existing ceiling is gypsum board
Q. Is hot gas reheat dehumidification system required for the package units?
A. Hot gas reheat is not required.
Q. Specs talking about DDC Controls with programmable software and also Bacnet interface with thermostats and wiring required for the project? Which one is applicable? Please confirm.
A. A DDC system is required as outlined in the Controls Drawing M003.
Q. Can the contractor use onsite restrooms or should they get their own?
A. There are no restroom facilities on site. The contractor will need to provide their own facilities.
Q. Will the FAA provide a storage room for the units?
A. A secured on site staging area will be provided for the contractor. The staging location will be provided at the construction kickoff meeting.
Q. Will the FAA provide an office room for the Contractor?
A. The facility does not have offices. There may be a desk that the local FAA technician can periodically make available for the contractor for limited computer work.
Q. The prints show new 4X SS disconnects outside and also factory mounted disconnects on the units-this seems redundant. Are both needed?
A. No, please provide outside disconnects. The units shall not be provided with factory mounted disconnects
Q. The prints show TVSS on each new exterior disconnect and an SPD on each unit. If the FAA wants both the 4X disconnects and the factory mounted disconnects do they also want the TVSS and the SPD as they also seem redundant?
A. Please provide an SPD on only the exterior disconnect switches. Both the factory mounted disconnects and associated SPD are not required.
Q. The drawings show 40 am breakers for the MOCP protection of the HVAC units. The Carrier units we would be supplying would only require a manufacturer recommended MOCP of 30 amps. The 30 amp would be a different circuit breaker size and also downsize the wire by one gauge. Is this the correct statement?
A. That is correct. In addition to revising the breaker and conductor sizes, the disconnect shall be reduced to 60 Amps, and the fuses to 30 Amps.
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