IFB - 3000012487 - Air Cooled Chillers ADD-01-LEB answers.doc

PROCUREMENT SERVICES

CONTRACT SERVICES TEAM

104 AIRPORT DRIVE

SUITE 3500, CB #1100

Chapel Hill, NC 27599-1100

T 919.962.9463 mark_sillman@unc.edu

FAILURE TO RETURN THIS ADDENDUM IN ACCORDANCE WITH THE INSTRUCTIONS MAY SUBJECT YOUR BID TO REJECTION.

To:

Prospective Offerors

Subj:

UNC-CH Bid Number:

3000012487 Bid Opening Date/Time:

10-06-2025 @ 1:00 PM EST

Addendum Date:

09-26-2025 Addendum Number:

This addendum is being issued to the subject IFB to answer questions raised during the time for questions allowed for in the IFB. Please note that the bid opening date has been changed to read 10-06-2025 vice 10-01-2025. All responses are to be submitted accordingly. All other information contained in the IFB remains the same.

Question 01: Will there be a site visit scheduled to determine mechanical and electrical work required for installation?

Answer: A site visit can be scheduled if needed – Please contact Lee Baker at lbaker@energy.unc.edu, or by phone at 919-777-3566.

Question 02: Also, a site visit to determine equipment placement to provide accurate pricing for installation and removal?

Answer: A site visit can be scheduled if needed - Please contact Lee Baker at lbaker@energy.unc.edu, or by phone at 919-777-3566.

Question 03: Could paralleled trailered 230TCHs be utilized; instead of single 500TCH units? We do stock single 500TCH units; however, this may be a more reliable and cost-effective solution requiring less overall power. In the event of a major failure, or maintenance these 230TCH units could be individually isolated/repaired-swapped, while the other paired 230TCH remains in operation.

a. 230TCH Spec:

· 3PH/480V/422MCA/500MOCP

· 600GPM Integral Pump Answer: No, 500-ton units are required due to cooling capacity, space, and electrical availability.

Question 04: Please confirm – will whole temporary chiller system supply and return feeds be unified and marry common plant supply and return connections, or will they be connected to separate taps?

Answer: Feeds will be unified and marry common plant supply and return connections.

Question 05: Where would best placement be specified per 53’ trailer – 3x total? (refer photo below)

Answer: Two of the chillers will be placed on the north side of the North Cooling Tower. The third chiller will be placed between the two cooling towers, or along the east side of the North Cooling Tower, depending on the plant situation at the time of placement, truck driver skill, etc.

Question 06: From which building will the power be supplied? (refer photo below) Two chillers will be powered from the building labeled Southside Chiller. One chiller will be powered from the building labeled Chiller Bldg.

a. Is there an estimated distance per conductor, to factor overall? Estimate 100’ per conductor for two of the chillers. Estimate 225’ per conductor for the third chiller.

b. Will cable distance vary per chiller trailer, based off placement? Yes

c. Where is the existing Supply/Return tap(s) located, or what is the estimated hose distance from chiller to tap(s)? (refer photo below) Taps are located in the building labeled Chiller Bldg. Estimate 175’ per hose for two of the chillers. Estimate 120’ per hose to connect to the third chiller. The hoses will be married together, and the contractor must provide all necessary fittings to join the hoses.

d. Please confirm – are the central building tap(s) are 12” FLANGE? Yes, 12” Flanges.

e. Approximately what is the distance 12” plant tap(s) to exterior of building? Approximately 40’ from the exterior of the building (rollup door).

f. Are the 12” tap(s) suspended vertically, or horizontally? The 12” flanges are located in sections of vertical piping.

Answer:

1. Check ONE of the following options:

Bid has not been mailed. Any changes resulting from this addendum are included in our Bid.

Bid has already been mailed. No changes resulted from this addendum.

Bid has already been mailed. Changes resulting from this addendum are as follows.

2. This addendum must be signed below and submitted with your:

a. Bid if your Bid has not been mailed.

b. Separate correspondence if you have already mailed your bid.

Execute Addendum

Company Name: _______________________________________________________

Authorized Signature: __________________________________________________

Name and Title (Typed): ________________________________________________

Date: _____________________

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