FA667519RA012_Combined_Responses_to_Questions_2May2019.pdf

FA667519RA012 Multiple HVAC Repairs 2 May 2019

Combined Questions and Answers

Question 1: The SOW request that 2 air handler units for building 1655 be replaced but not the condensers. The current condensers and air handlers are R-22 units and due to new EPA regulations R-22 units are no longer being manufactured. I will not be able to obtain R-22 Air Handling Units. If I obtain a R-410A air handling unit it will not be compatible with the R-22 condenser. Does the government therefore want both the condenser and the air handling unit replaced?

Answer 1: Replace existing AHU's and evaporator coils to improve system operations, utilizing the existing condensers. Evaporator coils and expansion valves shall be R-22 compatible.

Question 2: Buildings 1643, 1651, and 1660 with VRF system to service. Are as-built drawings, equipment submittal data, or equipment owner’s manuals available? If so, please provide.

Answer 2: Available documents are attached to this solicitation modification.

Question 3: Buildings 1236 – Is the Lennox Gas Fired Duct Heater to remain and be reused with the new split system? Is it acceptable to install the existing BacNet controller on the new split system?

Answer 3: Yes, the heater is to be reused with the new split. If/when available, reuse of existing BACnet controllers are acceptable as long as the system is complete and usable.

Question 4: Building 1619 – Is the existing Carrier Electric Heat Section to be replaced along with the split system? Is it acceptable to install the existing BacNet controller on the new split system?

Answer 4: Provide and install new heat sections/hot water coils equivalent to existing. If/when available, reuse of existing BACnet controllers are acceptable as long as the system is complete and usable.

FA667519RA012 Multiple HVAC Repairs 2 May 2019

Question 5: Building 1642 – Is the existing Electric Heat Section to be replaced? Is it acceptable to install the existing BacNet controller on the new split system?

Answer 5: Provide and install new heat sections/hot water coils equivalent to existing. If/when

Question 6: Building 1650 – Are the existing Electric Heat Sections to be replaced? Is it acceptable to install the existing BacNet controller on both systems?

Answer 6: Provide and install new heat sections/hot water coils equivalent to existing. If/when

Question 7: Building 1655 – Are the existing Electric Heat Sections to be replaced? Is it acceptable to install the existing BacNet controller on both systems?

Answer 7: Provide and install new heat sections/hot water coils equivalent to existing. If/when

Question 8: Please identify the Buildings that will need chemical pot feeders installed in the heating water loops, and/or chill water loops to perform proper water treatment.

Answer 8: Page 11, Chiller/Boiler Water Treatment referenced chemical pot feeders as filter feeders:

“Install 5 gallon dome bottom filter feeder with isolation and drain valves in bypass configurations as needed to provide means for chemical treatment, including buildings 1191 (chiller loop), 1650 (chiller loop), and 1604 (boiler loop).”