RFI LOG W50S8524B0002 as of 1 May 24.pdf

RFI LOG W50S8524B0002VGLZ 212001 REPAIR SIMULATOR HEATING, VENTILATION, AIR CONDITIONING

B34

1. Are there any “Brand Name Jus fica ons” for the equipment listed on Sheet M‐701?

A1. No there are not any brand name jus fica ons beyond that for the DDC system. The

Contractor is instructed to assure any new system is compa ble with ours. That can be done by other systems.

2. Regarding B34 simulator project transformer, it has a lead me of 80‐120 weeks + 16 weeks of shop drawings prepara on + Govt review and approval me. Project will go substan al past the allocated POP. Please review and revise.

A2: There are no transformer requirements. The project descrip on paragraph in SECTION 00

21 00 INSTRUCTIONS, CONDITIONS, AND NOTICES TO OFFERORS has been updated via

Amendment 01.

3. Specifica on sec on 051200 Sec on 1.6 A and B indicate to u lize a contractor that is cer fied by AISC as a cer fied erector. At this moment, there are only 15 companies in the en re state that are cer fied by AISC as an erector, and most if not all of them are extremely busy. This requirement would increase costs to the project drama cally, and poten ally out of the threshold. Please confirm if we can u lize other qualified contractors that do not cer fy themselves with AISC?

A3. The requirement for an AISC cer fied erector is deleted as per amendment 2 of the subject invita on for bids.

4. Specifica on sec on 236423.13 Air cooled chillers, sec on 2.1 B. indicates for zero percent performance tolerance in lieu of AHRI 550/590. Please confirm if the tolerance is zero, or if a typical 5% plus or minus is required?

A4. Please bid per the contract documents

5. Specifica on sec on 236423.13 air cooled chillers, indicates to provide integral pumps, however pumps are already being provided in the mechanical room for this chiller. Please advise?

A.5. Please bid per the contract documents

6. Sheet M‐701 ‐ The chiller schedule indicates to provide a chiller with integral water storage tank.

This requirement adds substan al addi onal costs and lead me to the unit. Can the water storage tank be installed separately within the mechanical room?

A6. Please bid per the contract documents

7. Based on the es mated me of award, submi al approval, and lead mes, the new chiller for this project will be the new R454B refrigerant in lieu of R410a shown in the schedule. Please confirm and acknowledge.

A7. We understand that the product will be mandatory for all new residen al and commercial ducted HVAC systems manufactured as of Jan 1, 2025, and installed as of Jan 1, 2026.

8. Please provide any current warran es on the roof.

A8. They have been provided with this RFI document.

9. Sheet M‐201 note 12 indicates to test and rebalance exis ng water source heat pump system serving remaining por ons of the building. Please provide drawings on the equipment a ached to the rest of this system.

A9. Provided are the latest HVAC as‐builts we could find for B‐34

10. Sheet E‐301 note E4 indicates to provide an electrical shunt trip breaker to shut down each mechanical ven la on unit. Please confirm we are only shu ng down our (2) new hvac units?

Please also confirm if the intent is to kill the main 480v feed, or if this is intended to be ran and shut down via the bms system?

A10. All the shunt informa on appears to be included on drawing E‐301. Several are indicated in the ‘HVAC EPO DIAGRAM’. The M series drawing should also be reviewed for shunt informa on.