Attachment 3 - Q and A Responses.pdf

Topic Question Response / Direction

Approved Equal – Thomson ATS

The SOW specifies an 800A, 480V ASCO automatic transfer switch or approved equal. Please confirm whether a Thomson Power Systems TS 870, 800A, 480V, UL 1008 automatic transfer switch, configured to provide the required functionality and controls interface, is acceptable as an approved equal.

It is an acceptable equal

Available Fault Current / WCR

Please provide the available fault current at the new ATS location, or the minimum required withstand and closing rating (WCR/SCCR), so the proposed 800A, 480V ATS can be properly rated.

This will need to be determined by the contractor

Johnson Controls – Scope

Please confirm whether the contractor is responsible for Johnson Controls programming, point mapping, graphics modifications, and functional testing associated with integrating the new Chiller #2 ATS, or whether USDA will provide the Johnson Controls programming/services.

The contractor is responsible

Johnson Controls – Sequence / Interface

Please provide the required sequence of operation and interface requirements for the one-chiller-only emergency-power interlock, including chiller priority and whether the ATS/BAS interface is to be hardwired dry contacts or a communications protocol.

Chiller 1 is priority. Chiller 2 ATS is to be interlocked to stay in Normal position until it is manually switched through the Metasys system because we have to physically swap pumps and valves around due to chiller 2 pumps are not on emergency power. To do this it would require dry contacts and communication protocol.

Shutdown / Cutover

Please confirm the maximum allowable shutdown/cutover duration for the ATS installation and whether shutdown work may be performed during normal work hours or must be scheduled after hours/weekends.

Work is to be performed during normal business hours. The maximum allowable shut down for connecting the chiller to the transfer switch should be no more than three business days.

Testing / Acceptance

Please identify any acceptance testing required beyond manufacturer-recommended startup and functional testing, including any requirement for factory-authorized ATS startup, NETA testing, breaker testing, arc-flash/coordination study updates, or demonstration of Chiller #2 operating on emergency power with the one-chiller-only interlock.

It will need to be proven that the ATS will only transfer when manually transferred in the Metasys system.

Solicitation Documents

Please confirm the correct solicitation number. Your RFQ identifies 1174579, while the SOW filename references 1174573. Please confirm the attached SOW is current and complete and provide any additional solicitation documents, amendments, terms, specifications, or attachments applicable to our scope.

The number on the file names was a typo. All documents should reflect the correct reference number 1174579.

File names are corrected, though nothing within the documents was changed.