NEW RFI answers for CHILLERS REPLACEMENT_Alares responses.docx

1. Is temporary SER cable tywraps to the mechanical supports sufficient for the temporary electrical feed to the temporary chillers or does it need to be in conduit?

Temporary chiller feeders shall be installed in conduit as illustrated on drawing E-002.

2. New Panelboard P7-N’s panel schedule shows breakers 7,9,11 feeding Hydronic Heat Pumps 1&2 but their locations are not shown on the drawings anywhere, please advise?

Circuit 7,9,11 powers existing ATS – Reconnect/extend related feeder to new panel as required. Circuit 26,28,30 is existing to remain. Reconnect/extend existing branch circuit wiring to new panel as required. The location of the Hydronic Heat pumps 1&2 are located in the southwest corner of the 7th floor mech rm.

3. New Panelboard P7-N’s panel schedule shows breakers13,15,17 feeding CHW Pump P-1 but it’s location is not shown on the drawings, how will the pump be controlled, please advise?

Circuit 13,15,17 is not required. Provide (3)-1P spaces for future use.

4. Drawing E-007, existing Distribution Panelboard 20-DX2, the 250amp breaker feeding a pull box in Room E-26 is outlined in Bold lettering, is there a scope of work for this or was the Bold outline a misprint?

Pull box is existing to remain.

5. Will an extension be granted to give subcontractors enough time to submit prop pricing?

This is up to contracting office.

6. Does the current conduit run proposed for reuse have provisions to meet NEC 300.19? Are there any specs on setting supports in the dumb waiter conduit run?

Vertical conduit run illustrated on drawing E-002 and E-005 shall be supported at top/bottom and at 40’ intervals in accordance with 2023 NEC 300.19 Table A . Support method shall be provided as outlined in 2023 NEC 300.19(C) – exact requirements shall be determined in the field.

7. Is temporary SER cable tie wrapped to the mechanical supports sufficient for the temporary electrical feed to the temporary chillers or does it need to be in conduit?

Temporary chiller feeders shall be installed in conduit as illustrated on drawing E-002.

8. New Panelboard P7-N’s panel schedule shows breakers 7,9,11 feeding Hydronic Heat Pumps 1&2 but their locations are not shown on the drawings anywhere, please advise?

Duplicate question

9. New Panelboard P7-N’s panel schedule shows breakers13,15,17 feeding CHW Pump P-1 but it’s location is not shown on the drawings, how will the pump be controlled, please advise?

Circuit 13,15,17 is not required. Provide (3)-1P spaces for future use.

10. Drawing E-007, existing Distribution Panelboard 20-DX2, the 250amp breaker feeding a pull box in Room E-26 is outlined in Bold lettering, is there a scope of work for this or was the Bold outline a misprint?

Pull box is existing to remain.

11. Will the temporary Chillers come with disconnects?

Disconnects shall be provided by Division 26 Contractor. See mechanical equipment schedule on drawing E-008.

12. Can the temporary disconnects for the Chillers be non-fused if the electrical contractor needs to supply where the tap disconnect will be fused?

Provide fused disconnects.

13. Drawing E006 calls for demolishing the (3)250kcmil cable to the roof, Drawing E007 calls out to reuse the existing (3) 500kcmil cables, which is correct?

Existing feeder powering existing chiller CH-2 shall be disconnected and removed – related 4”C shall remain. New feeder shall be installed in existing conduit. See key note 3 on drawing E-006. New feeder installed in existing conduit is illustrated on drawing E-007.

14. Please provide the Main Switchboard 20-SG-SWBD info so the correct 800amp breakers that need to be installed can be quoted correctly.

Switchboard is manufactured by GE with Power Break series breakers. Exact breaker requirements shall be confirmed in the field.

15. Please provide distribution Panelboard DP-1L info so the correct 400amp breaker that needs to be installed can be correctly quoted.

Distribution board is manufactured by GE. Exact breaker requirements shall be confirmed in the field.

16. Does the Electrical Switchboard need to be made in America?

Yes, Made in America

17. Do all the electrical materials need to be made in America?

Yes, Made in America

18. Confirm feeder size for new panel P7-N.

Feeder shall be 4#600Kcmil+#3G in 4”C.

19. What is the manufacturer of the existing membrane roofing system?

Refer to AE-101 ( Trimco)

20. Is there a warranty on the existing roofing system?

Refer to AE-101

21. What is the thickness of the existing roofing system?

NOTE: Scope of roof removal and replacement to be determined and quantified during chiller replacement. - See drawing AE-101 Roof Plan.

22. Please advise if there are any hazardous materials.

According to the VA COR, there is no asbestos in the piping insulation.

23. Please the location for the crane.

24.

The proposed location for rigging, shown below and is to the right of the main entrance, bordering the new Community Living Center. GC to determine in the field and submit Crane Plan for approval.

25. Please confirm the steel fabricator and steel erector have to be AISC Certified.

Yes.

Fabricator Qualifications: AISC Quality Certification participant designated as AISC Certified Plant, Category STD.

Installer Qualifications: AISC Quality Certification Program participant designated as AISC Certified Erector, Category ACSE.

26. Please advise who the existing controls contractor is.

Johnson Controls.

27. Please advise if any work is required to be done after hours.

Off hours work would be needed to tie in equipment to building, electrical shutdowns would also be done on off hours so no disruption to facility operations.

28. What is the required duration of the rental chillers?

The GC is required to provide a schedule in accordance with the Specification and advise the VA how long the rentals will be needed. This is means and methods

29. Do the temporary chillers require controls tie in?

Yes. Use the same sequences as permanent chillers.

30. Can you please provide existing Roofing Manufacturer.

See question 19

31. Is the current Roof under warranty?

See question 20

32. What brand of glycol does the VA currently use?

Duplicate question already responded.

33. Can a crane be set up on the other side of the building for the 4” temporary steel installation?

See question 23

34. Will there be a detailed engineered drawing for the temporary steel pipe?

Refer to MH-001. Contractor shall provide detailed temporary piping support drawings for review

35. Can the crane work be done Monday through Friday during normal working hours?

VAMC to confirm.

36. Is the required shutdown work done Monday through Friday during normal working hours?

Refer to G-002. Contractor shall submit phasing plan with shutdowns for review.

37. MH-004 has the lower roof level at 107’. Can you indicate ground level?

The level on the MH-004 if for reference only. The actual elevation of the low roof is 436’-9-1/2” while the ground level is 360’ .

38. What is the required duration of the rental chillers?

Refer to question 27.

39. Do the temporary chillers require controls tie in?

Refer to question 28.

40. The city of Manchester requires the fire department to fire watch. Will this be a requirement at the VA facility?

Since the sprinkler system will not be impaired, fire watch will not be required.

41. Are the roof pipe supports per note 2 on MI-200?

Yes image1.gif