Questions and Answers to Project Documents — Business Opportunities
PROJECT:  Central Utility Plant (CUP) R-22 Replacement
NUMBER:  201734839

Current as of:  7/20/2017
 
Question Number  1:   Specification section 230923 Direct Digital Controls Part 2 Products 2.1 Manufacturers A. Basis of Design.  The existing CUP DDC system is Johnson Controls Metasys.  Confirm that the new DDC system for the chiller replacement project is to be Johnson Controls.  Please confirm that this should be added to the specification as the basis of design as the existing CUP front end system.  Confirm that all temperature control systems and instrumentation for the new chillers along with the existing chillers is to be connected to the existing Johnson Controls Metasys CUP system.    
    Answer:   It is confirmed that the new DDC system shall be Johnson Controls and shall connect into the existing Johnson Controls Metasys CUP System.
Question Number  2:   Specification section 236416 Part 2.1A lists Carrier as an acceptable vendor.  Part 2.4 A1 lists R-123 as the only refrigerant.  Carrier chillers utilize a positive pressure refrigerant; HFC-134a.  Please confirm HFC-134a is acceptable for this project.
    Answer:   No, HFC-134a is not acceptable for this project.
Question Number  3:   Specification section 236416 2.9A states the VFD shall be factory mounted.  Please confirm the VFD is to be a free standing medium voltage VFD as shown on the plan drawings.
    Answer:   Free-standing, medium-voltage VFDa are correct per the plans. Updates to the specifications will be issued in the conformed set of contract documents issued at the award of contract.
Question Number  4:   Specification section 236416 2.3D requires an open drive motor.  Please confirm that a hermetic motor design is acceptable.
    Answer:   A hermetic motor design is preferred. Updates to the specifications will be issued in the conformed set of contract documents issued at the award of contract.
Question Number  5:   Can the prime contractor be a mechanical prime with a s(A) general contractor on the team?
    Answer:   Answer being researched.
Question Number  6:   What are requirements for the old chillers and pumps after removed from CUP (demo, scrap or DEN required storage)?
    Answer:   Answer being researched.
Question Number  7:   On drawing M4.09 item 2.e  states that the plant shall be capable of running in the optimum energy mode (OE).  It states that this work is furnished under a separate contract.  Confirm that this project will provide the programming and commissioning without the OE work and that work will be performed after the completion of this project.  Confirm that the control contractor shall exclude the work related to this sequence of operation since it is not defined. 
    Answer:   Answer being researched.
Question Number  8:   Confirm the following:  General note 1 on drawing M.11 states that the RTU shall be furnished with factory packaged controls and not field installed controls.  The RTU shall be furnished with a BACnet interface for connection of the RTU to the EMCS.  The note states that the EMCS contractor is to coordinate with the RTU controls to accomplish the sequence of operation.  The sequence of operation is the responsibility of the RTU supplier because they are furnishing the factory packaged controls.  The EMCS contractor shall be responsible to connect the CUP EMCS to the BACnet communications card and read/write to the RTU control points allowed by the RTU manufacturer.  RTU factory packaged controls cannot be modified by the EMCS contractor due to violation of RTU equipment warranty and the inability of EMCS contractor to change the sequences that are provided with these factory packaged controls. The EMCS contractor is limited to read, write, and adjust RTU only the control points based allowed by the RTU manufacturer.  The RTU controls start-up must be furnished by RTU equipment supplier. 
    Answer:   Answer being researched.
Question Number  9:   For control equipment IP connections that require a structured cable (Cat 6 ), confirm that DEN will provide the equipment and technical work to connect the equipment to the DEN data network. Provide a quantity of IP connections and a central location in the CUP for these points of connection. 
    Answer:   Answer being researched.
Question Number  10:   Confirm that each VFD shall furnished with a BACnet MSTP open protocol communications card by the VFD manufacturer.   
    Answer:   Answer being researched.
Question Number  11:   Confirm that each chiller shall furnished with a BACnet IP open protocol communications card by the chiller manufacturer.
    Answer:   Answer being researched.
Question Number  12:   Confirm that each flow meter shall furnished with a BACnet IP open protocol communications card by the flow meter manufacturer.
    Answer:   Answer being researched.
Question Number  13:   Confirm that each packaged roof top unit shall furnished with a BACnet MSTP open protocol communications card by the RTU manufacturer.
    Answer:   Answer being researched.
Question Number  14:   Please confirm that the Electrical Contractor not the pump or AHU supplier is to furnish the VFD for pumps. See sheet E1.02 note #3 and E6.07 note #3
    Answer:   Answer being researched.
Question Number  15:   Please clarify that all medium voltage raceways are to be GRC. The specification call for an approved raceway. (Section 260513 part 3.1  line I) Is any other Raceway type considered Approved?
    Answer:   Answer being researched.
Question Number  16:   Can raceway and cable be used instead of Buss Duct. To feed HGMC-C?
    Answer:   Answer being researched.
Question Number  17:   Please confirm that the Johnson Control is to quote separate to the electrical contractor the reconnection and reconfigure of associated  controls  of chiller #3 to chiller #1. This shows up in a note on E1.01 note #11. This is not common and would be part of their quote to Mechanical Contractors.
    Answer:   Answer being researched.
Question Number  18:   23 05 48 P-5 Calls for inertia bases under pumps.  Most of the new pumps are turbine pumps that would not normally be set on inertia bases.  The existing pumps are not on inertia bases.  Which new pumps are expected to receive inertia bases?
    Answer:   Answer being researched.
Question Number  19:   23 21 13 P-7 Calls for sch. 40 pipe on condenser water and chilled water systems.  Starting at 12” pipe, schedule 40 and std. wt. are not the same thing.  By the time you get to 24” pipe, schedule 40 is almost twice as thick as std. wt.  (.688” vs. .375”).  Is schedule 40 really the intention of the request?
    Answer:   Answer being researched.
Question Number  20:   Insulation section 23 07 19 calls for the bottom 10’ of insulation to be jacketed with aluminum.  This is not the same as existing. Does DIA want this on the new installation or like the existing conditions?
    Answer:   Answer being researched.
Question Number  21:   The RFP requests that the font used must be Times New Roman font 12pt. Can headers, captions and graphics labeling be in a smaller and or larger font?
    Answer:   Answer being researched.
Question Number  22:   Conduit above Turbine pumps must be temporarily moved to pull existing pumps and install new. (See M3.02)  What does this conduit serve?
    Answer:   Answer being researched.
Question Number  23:   Drawings in the Phasing Plan show "New Slide Gates" in the inlet structure for the condenser water sump.  Is any work in the inlet sump a part of this project scope?
    Answer:   Answer being researched.
Question Number  24:   On M4.01 & M4.02 there is 1" CS that joins the discharges of the CW pumps. What is its purpose?
    Answer:   Answer being researched.
Question Number  25:   Chemical treatment is being  "temporarily" relocated to Bay 5.  What will be its final location?  When should that occur?
    Answer:   Answer being researched.