RFIs .pdf

Requests for Information Solicitation 1232SA26Q1226

Question 1: Can photographs of the existing rooftop unit and surrounding roof area be provided?

Answer 1: The unit is at ground level ground on a 55”x 93” concrete pad. Photos attached.

Question 2: Please provide existing unit nameplate/model information.

Answer 2: Manf. Trane, Model# YHC072A3RMA07F10…600, S/N 208100013L

Question 3: Please provide existing roof curb dimensions.

Answer 3: N/A

Question 4: Please provide the approximate roof/building height.

Answer 4: N/A

Question 5: Please provide roof access information.

Answer 5: N/A

Question 6: Are any mechanical or roof drawings available?

Answer 6: No.

Question 7: Please provide supply and return duct/plenum dimensions, if available.

Answer 7: Unknown, but included pictures may give some indication.

Question 8: Please provide any known crane access or staging restrictions.

Answer 8: None

Question 9: Is a properly sized curb adapter acceptable for the replacement unit?

Answer 9: May not be needed, see question #1 answer.

Question 10: Please confirm the physical location and elevation of the existing HVAC unit identified as PREC-1, including whether it is roof-mounted, grade-mounted, or otherwise elevated.

Answer 10: Unit will be ground mounted, no elevation.

Question 11: Please also confirm whether crane or other lifting/rigging equipment will be required for removal of the existing unit and placement of the replacement unit.

Answer 11: Units should be able to be moved/positioned using a forklift.

Question 12: Please confirm that the required supply and return plenum work is limited to the modifications/transitions necessary to connect the replacement unit to the existing duct system, rather than replacement of the existing building ductwork.

Answer 12: Confirmed

Question 13: Please advise if there are any specific requirements for site access beyond a government-issued photo ID, such as advance registration, escorts, or PPE requirements.

Answer 13: Please coordinate visit with COR.

Question 14: Please clarify whether the Contractor or WRRC is responsible for the removal and disposal of the existing HVAC unit.

Answer 14: Contractor is responsible for cleanup, including disposal.

Question 15: Is the fused disconnect included in the scope to be replaced?

Answer 15: No

Question 16: Is there an interlock between the exhaust fan and the HVAC unit?

Answer 16: Unknown

Question 17: Is the HVAC unit controlled by local or BMS? If BMS, please provide the manufacturer and version.

Answer 17: HVAC unit will be connected to a Micro-Grow greenhouse control system. This is outside the contract scope.

Question 18: Will temporary cooling be required?

Answer 18: No.

Question 19: Will the unit specified required alteration to the existing concrete pad? If so, will this be included in the scope?

Answer 19: Should not.

Question 20: Will the new unit require hold down bracket to be secured to the concrete pad?

Answer 20: No

Question 21: What are the working hours?

Answer 21: Work hours can be adjusted to suit contractor’s needs.

Question 22: What is the extent of duct cleaning required?

Answer 22: Would be good to have any reused ducts cleaned, if possible.

Question 23: Is there a detail for the flashing that is required for the ductwork?

Answer 23: Unknown. See photos.

Question 24: Is any Pre and post-TAB required?

Answer 24: No, except to the extent required to confirm proper functioning of the new equipment.

Question 25: Please confirm the extent of the TAB leak testing is on the new ductwork only.

Answer 25: Yes.

Question 26: What is to be done with the existing exhaust fan?

Answer 26: Contractor is responsible for disposal of replaced equipment.

Question 27: Is the existing exhaust fan to remain and be tied back into the new unit return air ductwork?

Answer 27: If functional

Question 28: What is the existing control sequence for the exhaust fan and AHU?

Answer 28: Unknown.

Question 29: Is the existing ductwork sizing to remain and tied back into the new RTU?

Answer 29: Yes

Question 30: Please confirm the existing housekeeping pad is to remain and be reused.

Answer 30: If feasible.

Question 31: Is there an existing controls contractor or company? If so, please provide their contact information.

Answer 31: There is no existing controls contractor. HVAC unit will be connected to a stand-alone Micro-Grow greenhouse control system.

Question 32: Is there an existing DDC or BMS system?

Answer 32: No