Questions answered Bldg. 105 HVAC.docx

Solicitation # W50S9321R0002 Replace two 12.5-ton HVAC Unit at Building 105 Questions Received from bidders as of 2-24-21;

1. Is it required for each unit to have a return duct?

· Answer; Yes, Contractor shall provide and install new return ductwork for each unit from building to unit. Assume 20 LF of ductwork Refer to attachment no. 1. The Contractor is reminded that linear distance from return ductwork to new units will depend of the return duct location on new units proposed. Contractor is responsible to verify existing dimension and condition.

2. The existing thermostat brand is HONEYWELL, is the intention of the owner use the same model or can we use an equivalent model?

· Answer; Contractor have to remove and provide a new thermostat equal/similar to existing.

3. The existing HVAC unit models are TRANE and GOODMAN respectively, can the new units be of different models that comply with the specifications or be both of the same existing models?

· Answer; Brand of new units may be different from existing. However, both units have to be from the same manufacturer and comply with specification requirement.

4. Do you have the specifications of the required CFM, supply air temperature and space temperature?

· Answer; Information not available.

5. Corrosion treatment, shall include also the evaporator coils inside the units?

· Answer; Yes

6. We recommend an alternate to supply outdoor air handler units with inverter condensers. This alternative will be more effective for temperature control and last longer than standard RTU's. Let us know if we can add this alternate in the proposal.

· Answer; Yes Contractor could

7. Can the units to be installed, be of another brand as long as they comply with the buy American Act.?

· Answer; refer to response no. 3

8. Is the remote temperature sensors the same?

· Answer; Yes

9. Is safety switch going to be replaced?

· Answer; Yes. Existing safety switch, wiring and conduit up to unit connection to be replace in accordance with new unit manufacturer recommendation and NEC compliance.

10. Can the existing control cable be used? If it is necessary to replace the cable, would it be the same as the existing one?

· Answer; No, Existing control cable to be replace with new control cable equal or similar to existing.

11. The return louver, will be aluminum OAL type with bird screen?

· Answer; Yes, Refer to response no. 1

12. Please provide Plans of existing HVAC conditions and proposed work to be done.

· Answer; Refer to SOW.

13. What Standard should the Anti corrosive treatment comply with?

· Answer; Please refer to Paragraph 5.1.3.1 of SOW

14. Please clarify if bid bond or payment and performance bond is required for this solicitation.

· Answer; Not applicable

15. Please provide details of the disconnect switch to be replaced.

· Answer; Refer to response no. 9

16. Please clarify the linear distance between the disconnect location of each HVAC equipment and the HVAC Equipment it feeds.

· Answer; assume 12 LFT. approx. The Contractor is reminded that linear distance from disconnect to new units will depend of the connection location on new units proposed. Contractor is responsible to verify existing dimension and condition.

17. Please indicate the linear distance between the disconnect switches and the Main Distribution panel.

· Answer; Not include in Contract

18. What is the percent of BID Bond, if required, for each project?

· Answer; Not applicable

19. Will the proposals be presented in separate documents for the corresponding project?

· Answer; Yes, each quote/proposal will be submitted separately under their respective assigned solicitation numbers.

20. What is the brand of preference of the package unit that will be installed in building 105? or is there none?

· Answer; No specific brand.

21. Will the capacity of the package unit be the same as the existing in the site of building 105?

· Answer; Yes.

22. Will the controls and the signal cable used be the same or will it have to be new?

· Answer; Refer to response no. 10

23. Will the concrete pads be impacted if the size of the new machines are larger?

· Answer; No, Contractor is responsible to install new proposed unit within the exiting concrete pad. Any change to existing concrete pad dimension due to new unit dimension will be Contractor responsibility and at no additional cost to the Government.

24. Will the existing electrical flexible and disconnected switch be re-used?

· Answer; Refer to response no. 9

25. How is the air handled inside of the building? Is it just ducted to space or are there variable air dampers controlling the air?

· Answer; flexible duct, KTR shall clean and remediate ductwork to remove all mold/mildew/fungal growth. (approx. 60 LF each unit)

26. Is there a building control system thermostat that controls the units? Or is it needs to be replaced?

· Answer; Refer to response no. 10

27. Are there electrical disconnects and do they need to be replaced? Pictures do not show them in place.

· Answer; Refer to response no. 9

28. Are both units required to be 100% Fresh Air.

· Answer; No, Refer to response no. 1

29. What is the space/volume of the building needed to be conditioned/serviced?

· Answer; No information available.

30. Do they each need to condition/service the rooms individually?

· Answer; Yes.

31. Are they meant to operate at the same time?

· Answer; Yes, but independently

32. What temperature is needed?

· Answer; 68° F, not to exceed 70° F

33. What humidity is needed?

· Answer; 40% min. – 60% max.

34. Are the controls being replaced as well?

· Answer; Yes, refer to response no. 2

35. Contract completion time is 90 calendar days. Equipment procurement is in the order of 10-12 weeks, is this time excluded from the 90-calendar day completion? Answer; No, however it would be taken under consideration to re-evaluate set delivery dates before due date for the receipt of offers (March 9, 2021)

36. Please provide photos of the two existing return grids (100% fresh air) and dimensions.

· Answer; Refer to answer no. 1

37. What is the proposal delivery method? i.e.; email, hand delivered

· Answer; can be either hand delivered at our address or email specified in the solicitation

38. SF 1442 was not provided as part of the bid documents on beta.sam.gov. Will the official form SF 1442 be provided to submit the corresponding bid on this project or can a company proposal form be submitted in its place? Answer; No standard form necessary, firms can submit their pricing using firm’s particular quotation formats ensuring that descriptions/characteristics of the work/items proposed are thorough and clear to understand addressing the requirements from the solicitation Scope of Work and responses to be given by our agency.

ATTACHMENT NO. 1

image1.jpg image2.jpg