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Addendum No.3 <br />May 18, 2017 <br />Page two of three <br />9. Page A1-3, Section: Variable Chilled Water Pumping Control -- Pricing to be provided by <br />Contractor as Option C: Install a new variable speed drive to control the existing chilled <br />water pump motor. Revise to read as follows: Install two new variable ABB frequency <br />drives (VFD) with bypass, and two new VFD rated motors. Add two appropriate outside <br />rated enclosures and factory certified startups for VFD's. <br />10. Page A1-3, Section: Description of Work: Auto -Demand Response (DR) Thermostats -- <br />Pricing to be provided by Contractor as Option A — Replace Bullet 3, sub -bullet: Refer to <br />the below list of preferred manufacturers for "Smart" Thermostat packages for Auto -DR <br />Implementation: <br />• RCS Technology <br />• Honeywell <br />• Siemens (preferred) <br />• Or Approved Equal <br />to read: All new controls will be Siemens and integrated into existing building controls. <br />The following questions have been received. An answer is provided immediately following: <br />1. Question - Controls and thermostats — what is going to control the fan coil units until the <br />DDC control system is installed? <br />Answer — New DDC Siemens zone controls, thermostats, and controllers are to be <br />installed and integrated into the existing Siemens Energy Management System. <br />2. Question -There are two chilled water pumps. Are they to install two VFD's? Are the <br />motors to be changed to VFD rated motors? <br />Answer—Two VFDs should be installed. If the motors are not inverter duty rated and/or <br />not compatible with VFD, they should be replaced as part of this scope. <br />3. Question —What is the deadline for requests for information? <br />Answer— May 26, 2017 at noon <br />4. Question — Is Siemens doing the controls if so who are they working for? The <br />contractor, the City or someone else? <br />Answer — The responding contractor is responsible for bringing in Siemens (or qualified <br />Siemens controls contractor) as a subcontractor under this effort. Contractor is <br />responsible. <br />6. Question —Can the chiller function correctly with variable flow due to the VFD's on the <br />chilled water pumps? <br />SANTA ANA CITY COUNCIL <br />Miguel A. P.M. Michole Martinez Vicento Sarmlanto Jose Solono P. David Sanevides Juan Villages Sel Tinejmo <br />Mayor Mayor Pro Tem, Ward 2 Ward 1 Ward 3 Ward 4 Ward 5 Word 6 <br />noul [lo(oJsanta.flne orn mmad'nez(atsamta-ana ora mur i.ntons.rtaano.orn jyyQ _te-ap\q!A dbeoeyidesriasama-ena. or Ivilleaaaam,nta-eneorn mina ero(dsanta-ena.om <br />