Amendment 1 Q and A Doc.pdf
PDF 65 KB Posted
- Attached to
- Replace Chiller 2, B500
- Solicitation number
- FA460026B0005
About this file
This is a Questions and Answers (Q&A) document for federal contract FA460026B0005 concerning the replacement of Chiller 2 in Building B500. The document does not address specific products, services, pricing terms, response dates, or award dates, as it serves to clarify technical scope and responsibility questions raised by potential bidders.
The Q&A addresses six primary areas of contractor responsibility and government furnishing: (1) integration of new chiller equipment into the existing building management system, with answers pending regarding the existing front-end system manufacturer, model, version, and government provision of credentials and licensing; (2) government furnishing of existing controls documentation, point lists, and DDC system programming, also pending; (3) refrigerant monitoring control panel procurement, to be determined by contractor discretion between chiller manufacturer supply or standalone contractor supply; (4) control valve and sensor scope, clarifying that no control valve replacement is included, analog thermometers and pressure gauges must be new, and all other control devices must be removed, saved, and reused; (5) existing exhaust fan conditions (EF-201/EF-202), with contractors to assume VFD modification will be needed while existing dampers, actuators, and control panels remain in place; and (6) refrigerant sensor supply for both R-134a and R-515B systems (ten sensors total), to be determined by contractor based on whichever procurement path provides a functioning system as designed.
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Text version
Q&A Document for FA460026B0005 - Replace Chiller 2, B500
Q1 — Existing Front End: The Temperature Control Notes on MD1.0 require integration of the new equipment into the existing building management system and updating of system graphics. Please identify the existing front end (manufacturer, model, and version), and confirm the Government holds and will furnish the credentials and licensing necessary for the awarded contractor to add the new equipment points and graphics.
Answer will be posted in the next Amendment.
Q2 — Existing Controls Documentation:
Will the Government furnish existing controls documentation, point lists, and programming for the existing DDC systems that new work must coordinate with?
Answer will be posted in the next Amendment.
Q3 — Refrigerant Monitoring Panel Responsibility:
Sheet M3.0 shows a new Refrigerant Monitoring Control Panel with associated sensors, alarm horns, and beacons. Please confirm whether this panel is to be furnished by the chiller manufacturer as part of the chiller package or furnished separately by the contractor as a standalone refrigerant monitoring system.
To be determined by the contractor. Contractor is free to select whichever path provides a functioning system as designed.
Q4 — Control Valves and Sensor Scope:
Drawings M2.0 and MD1.0 indicate existing sensors are to be removed, saved, and reinstalled in new piping via new threaded olets (MD1.0 flag note 11; M2.0 flag note 2), and new analog thermometers and pressure gauges are to be provided (M2.0 flag note 1). No control valve replacement is shown. Please confirm: (a) no control valves are included in the scope of work; and (b) which temperature sensors and differential pressure devices are intended to be new versus reused existing.
Per drawings, if control valves are not shown to be replaced, they are not included in the scope. Per flag notes, Analog thermometers and pressure gauges are to be new, all other control devices referenced in this question are to be removed, saved and reused per MD 1.0 Flagnote 11.
Q5 — Exhaust Fan EF-201/EF-202 Existing Conditions:
The control sequences on M3.0 require EF-202 to be driven to full speed upon refrigerant leak detection.
Please confirm the existing conditions of EF-201 and EF-202: (a) does the existing EF-202 VFD have an available dedicated input for the full-speed safety override, or is a VFD replacement/modification anticipated; and (b) are the existing outside air damper actuators (CD-201 through CD-204) and the existing damper control panel to remain and be reused?
For bidding purposes, assume the VFD will need modification to accommodate. Existing dampers, actuators and control panels to remain.
Q6 — Refrigerant Sensor Supply:
Sheet M3.0 requires refrigerant sensors for both R-134a (existing chillers) and R-515B (new chiller), ten sensors total. Please confirm whether these sensors are to be furnished as part of the refrigerant monitoring panel supplier's package, furnished with the chiller, or furnished separately by the contractor.
To be determined by the contractor. Contractor is free to select whichever path provides a functioning system as designed.
File details come from the government source that posted it. Updated .