SF-30 Amendment 19AS2025Q0031 Supply Installation of two (2) Cooling Towers for Chillers 827.pdf

Offers must acknowledge receipt of this amendment prior to the hour and date specified in the solicitation or as amended, by one of the following methods:

(a) By completing items 8 and 15, and returning or (c) By separate letter or electronic communication which includes a reference to the solicitation and amendment numbers. FAILURE OF YOUR ACKNOWLEDGMENT TO BE RECEIVED AT THE PLACE DESIGNATED FOR THE RECEIPT OF OFFERS PRIOR TO THE HOUR AND DATE SPECIFIED MAY RESULT IN REJECTION OF YOUR OFFER. If by virtue of this amendment you desire to change an offer already submitted, such change may be made by letter or electronic communication, provided each letter or electronic communication makes reference to the solicitation and this amendment, and is received prior to the opening hour and date specified.

E. IMPORTANT: Contractor is not is required to sign this document and return copies to the issuing office.

AMENDMENT OF SOLICITATION/MODIFICATION OF CONTRACT 1. CONTRACT ID CODE

2. AMENDMENT/MODIFICATION NUMBER 3. EFFECTIVE DATE 4. REQUISITION/PURCHASE REQUISITION NUMBER 5. PROJECT NUMBER (If applicable)

7. ADMINISTERED BY (If other than Item 6) CODE

STANDARD FORM 30 (REV. 11/2016)

Prescribed by GSA FAR (48 CFR) 53.243

FACILITY CODE

9A. AMENDMENT OF SOLICITATION NUMBER

9B. DATED (SEE ITEM 11)

10A. MODIFICATION OF CONTRACT/ORDER NUMBER

10B. DATED (SEE ITEM 13)

11. THIS ITEM ONLY APPLIES TO AMENDMENTS OF SOLICITATIONS

The above numbered solicitation is amended as set forth in Item 14. The hour and date specified for receipt of Offers is extended. is not extended.

12. ACCOUNTING AND APPROPRIATION DATA (If required) copies of the amendment; (b) By acknowledging receipt of this amendment on each copy of the offer submitted;

13. THIS ITEM APPLIES ONLY TO MODIFICATIONS OF CONTRACTS/ORDERS.

IT MODIFIES THE CONTRACT/ORDER NUMBER AS DESCRIBED IN ITEM 14.

CHECK ONE A. THIS CHANGE ORDER IS ISSUED PURSUANT TO: (Specify authority) THE CHANGES SET FORTH IN ITEM 14 ARE MADE IN THE CONTRACT ORDER

NUMBER IN ITEM 10A.

B. THE ABOVE NUMBERED CONTRACT/ORDER IS MODIFIED TO REFLECT THE ADMINISTRATIVE CHANGES (such as changes in paying office, appropriation data, etc.) SET FORTH IN ITEM 14, PURSUANT TO THE AUTHORITY OF FAR 43.103(b).

C. THIS SUPPLEMENTAL AGREEMENT IS ENTERED INTO PURSUANT TO AUTHORITY OF:

D. OTHER (Specify type of modification and authority)

Except as provided herein, all terms and conditions of the document referenced in Item 9A or 10A, as heretofore changed, remains unchanged and in full force and effect.

15C. DATE SIGNED

15A. NAME AND TITLE OF SIGNER (Type or print)

16C. DATE SIGNED

16A. NAME AND TITLE OF CONTRACTING OFFICER (Type or print)

14. DESCRIPTION OF AMENDMENT/MODIFICATION (Organized by UCF section headings, including solicitation/contract subject matter where feasible.)

PAGE OF PAGES

6. ISSUED BY CODE

8. NAME AND ADDRESS OF CONTRACTOR (Number, street, county, State and ZIP Code) (X)

CODE

15B. CONTRACTOR/OFFEROR

(Signature of person authorized to sign)

16B. UNITED STATES OF AMERICA

(Signature of Contracting Officer)

Previous edition unusable

Terry Alson

The purpose of this amendment is to provide responses to the questions received regarding the solicitation number:

19AS2025Q0031 Supply & Installation of two (2) Cooling Towers for Chillers.

U.S. Embassy Canberra GSO Procurement 21 Moonah Place Yarralumla ACT 2600

19AS2025Q0031

1 3

08/27/2025

08/12/2025

8/27/2025

Subject: Questions and Answers RFQ Title: 19AS2025Q0031 – Supply & Installation of Two (2) Cooling Towers for Chillers Due Date: September 11, 2025, at 5:00 PM AEST

Question 1. Can you provide area maps/drawings.

Answer: Chilled Water System Drawings, provided as attachment.

Question 2. Can you include photos of the site.

Answer: Photos of the site, including the existing cooling towers, provided as attachment.

Question 3. What are the integration requirements for the new cooling towers?

Answer: The new Cooling Towers and VSD/VFD will interface with the existing Carrier i-Vu BMS/BAS system. The integration will use standard BACnet/IP or Modbus TCP/IP protocols.

Assignment of unique network addresses for each cooling tower.

tower fan.

Question 4.

Answer:

Model: PCT0505-P3-I Flow Rate: 19.81 L/s Hot Water Temp: 35 °C Cold Water Temp: 29.44 °C Number of Units: 1 per chiller (2 total for the two chillers) Fan Type: Standard Fan, 1 x 3.73 kW motor per unit Heat Rejection: 460 kW per tower, 504 kW total Tower Pumping Head: 15.19 kPa Static Lift: 15.18 kPa Spray Pressure: 0.01 kPa Reserve Capability: 9.54%

Installation Notes: Towers can be installed individually; however, replacing both chillers.

Items required for installation:

Motorized bypass valves (Valve Schedule 11, 12, 25, and 26) Vibration isolators for fan motors Condensate drains Electrical connections for fan motor and control wiring Flexible connectors to accommodate thermal expansion

Question 5.

Answer: To ensure continuous operation of the HVAC system, the cooling towers must be replaced sequentially, one at a time. This approach ensures that at least one chiller remains fully operational at all times.

Key considerations for sequential replacement:

Careful planning is required to coordinate the replacement schedule with minimal impact on the HVAC system.

Temporarily adjust chiller load and bypass settings to accommodate operation on a single tower during the replacement process.

End of Q&A