B09_140G0225R0015_RFI_Q__A_0003.docx

Solicitation 140G0225R0015 – Request For Information (RFI) Questions (Q) and Answers (A). – 06/13/2025

· RFI Q1: The spec lists a design flow rate of 382 GPM and a leaving fluid temperature of 42°F ±2°F for the chilled water. Additionally, it calls for a nominal 170-ton machine. Can you confirm the desired entering and leaving chilled water temperatures (52°F entering, 42°F leaving)? Also, since nominal tonnage does not reflect actual tonnage, could you confirm the required actual tonnage for this application?

RFI A1: We’re not chiller experts by any means, we know we currently run Trane RTAC 170 ton capacity chillers. Additionally we’re asking that chiller supply temperatures to our air handlers are able to meet the 42 +/- 2 degree F.

· RFI Q2: Can you confirm the chilled water fluid type? Is it water, or does it contain glycol?

RFI A2: Water.

· RFI Q3: The spec states the chiller needs to operate within a range of 32°F to 105°F, but it does not specify the ambient temperature for performance rating. AHRI specifies 95°F—please confirm if this is the rating temperature you require.

RFI A3: We’re asking that the chillers are able to operate within an ambient temperature range of 32- 105 degrees F. We understand a diminished performance capability if ambient temperatures exceed 95 degrees, we were simply stating that we need to operate them in the window of 32-105 degrees F.

· RFI Q4: The chiller sound pressure values provided do not specify octave bands or measurement distances. Johnson Controls can estimate sound pressure, but that is not the official rating metric. Additionally, AHRI 370, ISO 3744, and ISO 9614 have different measurement and calculation criteria, leading to variation in sound pressure calculations. Since assumptions on chiller behavior (radiation model) affect results, and the field environment further influences sound pressure, could you provide clarification on the required sound performance criteria?

RFI A4: I believe this criteria came from a previous contract and we were simply trying to request that at 100% load that the chillers register below 72dba at whatever the standard 6’ or 10’ is (check with Mike Bonds?)

· RFI Q5: The spec calls for a steel leveling frame with (4) leveling feet and an adjustable range of up to 18 inches—this is an uncommon request. Could you provide details on the specific product or requirements for this frame?

RFI A5: We’re placing the chillers on an uneven concrete/asphalt driveway that will require adjustability via a frame encasing the chiller.

· RFI Q6: There is no mention of a circuit breaker or disconnect switch at each chiller—will this be required?

RFI A6: Yes, we only have the capacity to run one chiller at a time so some kind of I-Line switch panel would be required.