Schendt Engineering Corporation 2912 Beacon Street (719)

Transcription

1 Schendt Engineering Corporation 2912 Beacon Street (719) Colorado Springs, CO ADDENDUM NUMBER 1 DATE: 5 July 2017 OWNER: PROJECT: University of Colorado Colorado Springs El Pomar Data Center CRAC Units Replacement PROJ. NO: The Drawings, Specifications and Contract Documents on the subject project are modified, corrected, supplemented and/or superseded as hereinafter described. The following additions, deletions, changes and information shall become a part of and modify all work shown or described in the Drawings. All bidders shall make necessary adjustments in their bid on account of this addendum. Each and every bidder, subcontractor, and material supplier shall be responsible for reading each item in this addendum to ascertain to what extent and in what manner it affects the work in which they are interested. Each Bidder shall indicate on the Bid Form their acknowledgment of receipt of this addendum document by addendum number and addendum date. Addendum Items: 1. REMINDER: BID DATE is Tuesday, July 11, 2016 at 2:00 p.m. MDT. Refer to Bid Advertisement document included in the specifications for exact location to submit sealed bids for time-stamping. 2. The following items were discussed briefly during the pre-bid conference, and are again noted below for clarity during bidding process: a. On-Site Work Hours: Work shall be generally performed inside the existing building during normal business working hours, Monday through Friday unless specifically authorized by the Owner's Representative. Work outside the building shall not begin until 8 am due to the project s adjacency to a residential neighborhood. b. Reference specification section Project Summary regarding Special Campus Restrictions, including staging, stockpiling, vehicle access, and control of dust, dirt, odors and other objectionable effects as limited to the immediate area of construction. c. No construction waste materials may be disposed of in Owner's dumpsters or other Owner containers. 3. Sheet M-101 Demolition Plan, keynote no. 1 clarification: spare data center raised floor tiles are stored in Loading Area 150 and are available supplement reuse of existing floor tiles. 4. Sheet M-102 New Work Plan, keynote no. 1 clarification of neatly cut wall for access and provide temporary wall cover for phasing plan : as per pre-bid conference minutes dated 6/27/2017, coordinate with UCCS Facilities Management the removal of the existing wood paneling system for contractor to cut existing wall behind from floor to ceiling as required to core-drill concrete floors and route piping to next level. Note core-drill shall accommodate through pipe insulation. Also, reference specification sections Cutting and Patching and Selective Demolition, and firestopping item this addendum. 5. Sheet M-102, M-103 Demolition Plan, keynote no. 2 clarification: after removal of existing insulated refrigerant pipes, firestop opening as specified Basic Mechanical Materials and Methods. Firestopping foam, 3M Fire Barrier Rated Foam FIP 1-Step or equivalent, is an acceptable product. 6. Sheet M-103, clarification: Owner will occupy building during entire construction period. During lay-in ceiling system removal and replacement for refrigerant pipe installation, testing, insulation, and EPC CRAC Addendum No 1 Page 1 of 2

2 Schendt Engineering Corporation demolition, coordinate and schedule with Owner prior to construction operations to minimize conflicts and facilitate Owner usage. Limit the area with construction barriers and perform the Work so as not to interfere with Owner s day-to-day operations. Refer also to Specification Section Summary 1.5 Use of Premises. 7. Specification section Selective Demolition: record as-built structural drawings indicate conventional concrete slab (no pre-tensioned, post-tensioned cabling, or similar) at levels 2 & 3, and the existing piping (refrigerant and roof drain leader) chase appears to clear concrete beams along column lines 3 P. Subfloor scanning or x-rays are not required unless unanticipated mechanical, electrical, or structural elements that conflict with intended function or design are encountered during construction (i.e., core drilling through reinforced concrete beam). 8. Specification section Testing, Adjusting, & Balancing: section omitted from project manual but included in table of contents. Refer to attached as part of contract documents. 9. Specification section Commissioning Requirements clarification: UCCS will not be contracting a 3 rd party commissioning agent (CxA); however, contractor shall submit CRAC manufacturer s installation checklist and start-up report prior to functional testing by engineer of record. Contractor and controls contractor shall anticipate minimum half day for control point verification and functional testing (unless test no. 1 fails). attachment: Testing, Adjusting, & Balancing specification END OF ADDENDUM NUMBER 1 EPC CRAC Addendum No 1 Page 2 of 2

3 SECTION TESTING, ADJUSTING, AND BALANCING PART 1 - GENERAL 1.1 WORK INCLUDED A. Extent of testing, adjusting, and balancing work required by this section is indicated on drawings and schedules, and by requirements of this section; and is defined to include, but is not necessarily limited to, air distribution systems, hydronic distribution systems, and associated equipment and apparatus of mechanical work. The work consists of setting speed and volume (flow) adjusting facilities provided for systems, recording data, conducting tests, preparing and submitting reports, and recommending modifications to work as required by contract documents. B. Component types of testing, adjusting, and balancing specified in this section includes the following as applied to mechanical equipment: 1. Computer Room Air-conditioning units. C. Refer to Division-23 sections for installation and start-up of equipment to be tested, adjusted, and balanced. D. Refer to Division-23 sections for pressure testing of piping and/or ductwork systems. E. Refer to Division-26 sections for electrical hook-up and wiring of equipment to be tested, adjusted, and balanced. 1.2 QUALITY ASSURANCE A. Tester's Qualifications: Firm with at least 3 years of successful testing, adjusting, and balancing experience on projects with testing and balancing requirements similar to those required for this project, who is not Installer of system to be tested, and is otherwise independent of project. B. Tester's Qualifications: Firm certified by National Environmental Balancing Bureau (NEBB) in those testing and balancing disciplines similar to those required for this project and may also be the original Installer of system to be tested. C. Tester's Qualifications: Firm certified by Associated Air Balance council (AABC) in those testing and balancing disciplines similar to those required for this project. D. Codes and Standards: 1. NEBB Compliance: Comply with NEBB's "Procedural Standards for Testing, Adjusting, and Balancing of Environmental Systems" as applicable to mechanical air hydronic distribution systems, and associated equipment and apparatus. 2. AABC Compliance: Comply with AABC's Manual MN-1 "AABC National Standards", as applicable to mechanical air and hydronic distribution systems, and associated equipment and apparatus. 3. Industry Standards: Comply with ASHRAE recommendations pertaining to measurements, instruments, and testing, adjusting, and balancing, except as otherwise indicated. TESTING, ADJUSTING, AND BALANCING

4 1.3 SUBMITTALS A. Submit certified test reports signed by Test and Balance Supervisor who performed TAB work. In addition, have report certified by Professional Engineer who is familiar with TAB work and also with project, and who is registered in jurisdiction where testing is being conducted. B. Include identification and types of instruments used, and their most recent calibration date with submission of final test report. C. Submit biographical data on Engineer who is to directly supervise testing, adjusting, and balancing work. D. Maintenance Data: Include in maintenance manuals, copies of certified test reports, identification of instruments, and data on Engineer; in accordance with requirements of Division JOB CONDITIONS A. Do not proceed with testing, adjusting, and balancing work until work has been completed and is operable. Ensure that there is not latent residual work still to be completed. B. Do not proceed until work scheduled for testing, adjusting, and balancing is clean and free from debris, dirt and discarded building materials. PART 2 - PRODUCTS 2.1 PATCHING MATERIALS A. Except as otherwise indicated, use same products as used by original Installer for patching holes in insulation, ductwork and housings which have been cut or drilled for test purposes, including access for test instruments, attaching jigs, and similar purposes. 1. At Tester's option, plastic plugs with retainers may be used to patch drilled holes in ductwork and housings. 2.2 TEST INSTRUMENTS A. Utilize test instruments and equipment for TAB work required, of type, precision, and capacity as recommended in the following TAB standards: 1. NEBB's Procedural Standards for Testing, Adjusting, and Balancing of Environmental Systems. 2. AABC's Manual MN-1 "AABC National Standards". PART 3 - EXECUTION 3.1 INSPECTION TESTING, ADJUSTING, AND BALANCING

5 A. At time of bid take-off, review drawings for completeness in regards to balancing operations. Notify prospective contractors of discrepancies such as missing balancing dampers, balancing valves, etc. upon submittal of proposal to insure that these items are covered in his bid. B. Examine installed work and conditions under which testing is to be done to ensure that work has been completed, cleaned and is operable. Before any air balance work is done, the system shall be checked for: 1. Filters are installed (and changed if they are dirty). 2. Correct motor rotation. 3. Equipment lubrication and vibration. 4. Proper operation of automatic control dampers and valves. 5. Manual control dampers and air outlet dampers are wide open at this time. 6. Coil fins are cleaned and combed where needed. C. Do not proceed with TAB work until unsatisfactory conditions have been corrected in manner acceptable to Tester. 3.2 TOLERANCES A. Adjust air systems to the following tolerances: 1. Supply systems shall be balanced within 0% to +10% of design values; 2. Return systems shall be balanced within 0% to 10% of design values. 3.3 GENERAL TESTING, ADJUSTING, AND BALANCING A. Test, adjust and balance environmental systems and components, as indicated in accordance with procedures outlined in applicable standards. 3.4 CLOSEOUT PROCEDURES A. Prepare report of test results, including instrumentation calibration reports, in format recommended by applicable standards. B. Patch holes in insulation, ductwork and housings, which have been cut or drilled for test purposes, in manner recommended by original Installer. C. Mark equipment settings, including damper control positions, valve indicators, and similar controls and devices, to show final settings at completion of TAB work. Provide markings with paint or other suitable permanent identification materials. D. Prepare a report of recommendations for correcting unsatisfactory mechanical performances when system cannot be successfully balanced; including, where necessary, modifications which exceed requirements of contract documents for mechanical work. E. Retest, adjust and balance systems subsequent to significant system modifications, and resubmit test results. END OF SECTION TESTING, ADJUSTING, AND BALANCING