THE FOLLOWING CHANGES/ADDITIONS TO THE ABOVE CITED SOLICITATION ARE ANNOUNCED:

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1 Business Services Procurement and Contracting SW Merlo Road Beaverton, OR (503) February 20, 2018 SOLICITATION ADDENDUM NO. 2 ITB Kinnaman-Hiteon Chiller Replacement THE FOLLOWING CHANGES/ADDITIONS TO THE ABOVE CITED SOLICITATION ARE ANNOUNCED: This Addendum modifies the Invitation to Bid (ITB) document(s) only to the extent indicated herein. All other areas not changed or otherwise modified by this Addendum shall remain in full force and effect. This Addendum is hereby made an integral part of the ITB document. Bidder must be responsive to any requirements of this Addendum as if the requirements were set forth in the ITB. Failure to do so may result in Bid rejection. See the ITB regarding requests for clarification or change and protests of this Addendum, and the deadlines for the foregoing. This addendum is to be acknowledged in the space provided on the Bidder Certification form supplied in the solicitation document. Failure to acknowledge receipt of this addendum may be cause to reject your offer. The closing date Remains: February 28, 2018 at 2:00 PM Pacific Time CHANGES: SPECIFICATIONS Note: Revised Additions are in bold, deletions have a strikethrough. SECTION PACKAGE SCROLL CHILLERS 1) New Section - See attached. SECTION MODULAR SCROLL CHILLERS 1) Article 1.02, B: Add new paragraph as follows. B. A single chiller per this section or section shall be utilized for each school. 2) Article 1.03, B-2b: Revise condensing entering temperature to 91 deg. F. from listed 65 deg. F. 3) Article 1.05, B: Revise as follows. Page 1 of 2

2 B. Provide Optional 5-year extended parts-only warranty for scroll compressors only (5 years total). 4) Article 2.04: Change title of article to CONSTRUCTION. 5) Article 2.04, A: Delete second to last sentence, Each chiller module has two (2) steps of control (100%, 50% and off) by cycling off the compressors.. 6) Article 2.04, C: Revise as follows. DRAWINGS C. Evaporators and condensers: Each evaporator and condenser shall be dual circuited, brazed plate shell and tube heat exchangers constructed of 316 stainless steel; designed, tested, and UL stamped in accordance with ASME Section VIII pressure vessel code for 650 psig working refrigerant pressure on the evaporator and 650 psig working pressure on the condenser. Both the condenser and evaporator heat exchanger shall have a working pressure for the water circuits at least 285 psig. Evaporator and condenser shall both be mounted on two layers of noise attenuating rubber isolation pads which also acts as a thermal barrier. Evaporator, chilled water piping, chilled water headers and suction side refrigerant tubing shall be wrapped with closed cell insulation to prevent condensation. Drawing KM2.1 and HM2.1 issued with clouded revision to note the addition of a strainer at the condensing water pipe connection to the chiller from the tower. -END of Addendum Michael Mathews Purchasing Manager Page 2 of 2

3 PART 1 - GENERAL 1.01 RELATED DOCUMENTS A. Drawings and general provisions of the Contract SUMMARY A. This Section includes water-cooled modular, electric motor driven, scroll water chillers. B. A single chiller per this section or section shall be utilized for each school SUBMITTALS A. The chiller manufacturer must submit the following criteria by which the chiller bid will be evaluated. B. Submit the following: 1. Manufacturer s warranty details specified in Article 1.5 below. 2. Product Data: Include refrigerant, rated capacities, operating characteristics, furnished specialties, and accessories. Specifically, include: a. Chilling Tons, EER at Full Load, EER at Part Load (IPLV). b. Minimum chiller operating capacity with 91 deg. F entering condenser water temperature c. Minimum evaporator flow rate 3. Shop Drawings: Complete set of manufacturer's certified prints of water chiller assemblies, control panels, sections and elevations, and unit isolation. Include the following: a. Assembled unit dimensions. b. c. Evaporator and condenser heat exchanger construction Compressor data d. Required clearances for maintenance and operation. e. Size and location of piping and wiring connections. f. Wiring Diagrams: Power, signal, and control wiring. g. Control panel product data and BAS interface information 4. Warranty Certificate C. Submit the following after award of contract: 1. Certificates: For certification required in "Quality Assurance" Article 2. Startup service reports. 3. Operation and Maintenance Data: For each equipment item to include in emergency, operation, and maintenance manuals QUALITY ASSURANCE DECEMBER

4 A. Products shall be Designed, Tested, Rated and Certified in accordance with, and installed in compliance with applicable sections of the following Standards and Codes: 1. ANSI/AHRI 550/ Standard for Water Chilling Packages using the Vapor Compression Cycle. 2. ANSI/ASME SEC 8 - Boiler and Pressure Vessel Code. 3. ANSI/ASHRAE 15 - Safety Code for Mechanical Refrigeration. 4. ANSI/UL Central Cooling Air Conditioners. 5. ANSI/ASHRAE Energy Efficient Design of New Buildings. 6. ANSI/UL Safety Standards for Hermetic Motor Compressors. 7. ASHRAE 34 Number Designation and Safety Classification of Refrigerants 8. ARI Standard 550/590 Positive Displacement Compressors and Water Cooled Rotary Screw Water-Chilling Packages 9. Conform to UL code 1995 for construction of chillers and provide UL/cUL listing label for electrical panel construction Manufactured in facility registered to ISO 9001 OSHA - Occupational Safety and Health Act B. Factory Test: Chiller shall be pressure-tested, evacuated and fully charged. C. See Commissioning specifications for other required work WARRANTY A. Provide Manufacturer s 1-year, Parts-Only Warranty. Refer to warranty details provided by the manufacturer. B. Provide 5-year extended parts-only warranty for scroll compressors only (5 years total). PART 2 - PRODUCTS 2.01 SUMMARY A. The contractor shall furnish and install units as shown and scheduled in the plans. The units shall be installed in accordance with this specification and produce the specified performance in accordance with AHRI Standard 550/590. B. Approved manufacturers: 1. Trane: CGWQ 2. Alternate Manufactures by Daikin or York shall have chiller total length not in excess of COMPRESSOR AND MOTOR A. The compressors shall be scroll mounted on vibration isolators. B. Lubrication System: Oil distribution system shall include an oil level sight glass and arranged to ensure adequate lubrication during starting, stopping, and normal operation. DECEMBER

5 C. Motor: Constant speed 3600 rpm, suction gas cooled, winding thermostats for motor protection, and designed for across the line start. D. Compressor selection and sizing shall be such that staged operation or variable capacity compressors provide turn-down capacity to at least 30% of full load capacity. Variable capacity compressors are VFD driven compressors or digital operation compressors EVAPORATOR A. Provide evaporator of brazed plate design. Water side shall have only 1 entering and 1 leaving connection. Unit shall feature factory selected and installed 20 mesh strainer on evaporator inlet B. Design, test and stamp refrigerant side maximum working pressure for 600 psig (minimum) in accordance with ANSI/ASME SEC 8. C. Design and test water side working pressure for 600 psig (minimum). D. Insulate with 0.50 inch (12.7mm) thick flexible insulation with a K value of E. Provide factory selected and installed integral water strainer, grooved connections, and factory installed water temperature sensors for both entering and leaving chilled water CONDENSER A. Provide condensers of shell and tube type, seamless or welded steel construction with cast iron or fabricated steel heads, and enhanced copper tubes expanded into tube sheets. B. Provide removable water heads and mechanically cleanable and replaceable tubes. C. Provide condenser with one entering and one leaving water connection. Provide factory-manifolded water-side connections on dual condenser models. D. Design and test refrigerant side for 600 psig working pressure (minimum). E. Design and test water side working pressure for 150 psig. F. Provide internally enhanced condenser tubes with minimum nominal tube wall thickness of.025 inches. G. Provide condenser designed, tested, and stamped in accordance with ASME. H. (Dual Circuit Units Only) Provide ship loose condenser header system for single point water connections 2.05 REFRIGERANT CIRCUIT A. Provide refrigerant circuits, factory supplied and piped. B. Provide for each refrigerant circuit: 1. Liquid line solenoid valve. DECEMBER

6 CONTROLS 2. Filter dryer. 3. Combination liquid line sight glass and moisture indicator. 4. Charging port. 5. Insulated suction line. A. Locate on the chiller, a unit control panel, containing a power distribution section and a controls section with a unit microprocessor controller 1. Unit control panel shall contain both a control section and a power distribution section arranged in a key lockable NEMA 1-style enclosure. B. Provide the following devices in power distribution section: 1. Top or bottom access for power wiring. 2. Factory wired single point power connection to Non-fused disconnect switch Grounding lug for customer connection. Control power transformer with primary and secondary fused protection. 5. Arrangement for across-the-line start. 6. Three-phase voltage monitor providing protection against common voltage faults such as unbalanced, over/under voltage, phase loss, reversal and incorrect sequencing. Fault must require a manual reset. C. Provide the following devices in the control section: 1. Microprocessor based controller with display and keypad on exterior of control panel door. Microprocessor must have multiple levels of password security. 2. Terminal strip with provision for field connection of Remote Run / Stop contacts and Chilled Water Flow Proving device contacts (required). 3. Control wiring and terminal strips arranged in such a way as to facilitate ease of service and diagnosis. D. Provide a microprocessor display and keypad accessible from unit exterior with a minimum of the following: x 64 dot pixel display screen capable of displaying all unit control set points, fault and alarm conditions with history, and operating conditions wide x 6.5 high keypad 3. RS-232 port allowing the user to interactively communicate with the microprocessor controller 4. Display must be capable of displaying all unit set points, faults and alarms, and operating conditions. E. Microprocessor controller must have the following: 1. Design for hostile environment of HVAC/R industry 2. Displays, alarms and other interfaces must be accomplished in a clear and simple language that informs the user as to the status of the controller. 3. Proportional, integral, derivative (PID) chilled water temperature control. 4. Controller must have RS485 and Ethernet communications ports for user interactive communication, or for monitoring purposes to a Building Management System (BMS) running Modbus RTU or Johnson N2 (RS485) or BACnet IP or Modbus IP (Ethernet). 5. Controller must have the ability through BMS input for Remote Run/Stop, Leaving Chilled Water Temperature Reset and Load Shedding. 6. Microprocessor must be capable of BACnet MS/TP communication. DECEMBER

7 Display readouts shall include operating modes, water temperature set point, operating temperatures, and diagnostic information. Provide access and operation of display without the need to open or remove unit panels. 8. Should a fault occur that results in a lock out condition, the controller must record 30 seconds of prior operating history for fault analysis. F. Provide the following safety controls and diagnostic display for automatic shutdown of the machine, requiring manual reset: 1. Low chilled water temperature. 2. High condenser refrigerant discharge pressure (one retry allowed before manual lockout). 3. Low suction pressure. 4. Low refrigerant suction superheat. 5. Voltage unbalanced, over/under voltage, phase loss, reversal and incorrect sequencing. G. Provide the following safety controls for automatic shutdown of the machine with automatic reset: 1. Chilled water flow proving device. Under no circumstances should the flow proving devices be used to start and stop chiller during normal operation. Flow proving device is required and must be field installed by others BUILDING MANAGEMENT SYSTEM A. Provide an interface with BACnet MS/TP Building Management System (BMS) for monitoring of Chiller operations. Chiller microprocessor must be capable of receiving a BMS input signal for Remote Run/Stop, Leaving Chilled Water Temperature Reset and Load Shedding. PART 3 - EXECUTION 3.01 EXAMINATION A. Examine areas to receive chillers for compliance with installation tolerances and other conditions effecting performance and maintenance of chillers. B. Examine proposed route of moving chillers into place and verify that it is free of interferences. C. Verify piping roughing-in locations. D. Verify branch circuit wiring suitability. Do not proceed with installation until unsatisfactory conditions have been corrected PIPING SYSTEM FLUSHING PROCEDURE A. Prior to connecting chillers to water loops or after connections with the manual valves in the closed position, the piping shall be flushed with a detergent & hot water mixture to remove previously accumulated dirt and other organic. DECEMBER

8 B. During flushing any strainers in the system shall be examined periodically and cleaned when required. The flushing process should take no less than 6 hours or until the strainers when examined after each flush are clean. After flushing with the detergent and/or dilute acid concentrations the system loop shall be purged with clean water for at least one hour to ensure that all residual cleaning chemicals have been flushed out WATER TREATMENT REQUIREMENTS A. Both water loops shall be analyzed and treated by a professional water treatment specialist to ensure brazed plate heat exchanger longevity by keeping the water within the following parameters: 1. Sulfates Less than 200 ppm 2. ph Chlorides Less than 200 ppm 4. Nitrate Less than 100 ppm Iron Ammonia Less than 4.5 mg/l Less than 2.0 mg/l 7. Manganese Less than 0.1 mg/l 8. Total Dissolved Solids (TDS) Less than 1000 mg/l 9. Hardness as CaCO3 30 to 500 ppm 10. Alkalinity as CaCO3 30 to 500 ppm Equipment manufacturer shall provide sample bottles and have analysis done at time of start-up of equipment. Owner is responsible for maintaining proper parameters INSTALLATION A. Install chillers according to manufacturer's written instructions. B. Install chillers plumb and level, and anchor housekeeping pads to building floor. Anchor chiller and vibration isolators to housekeeping pad. C. Install vibration isolators according to isolator manufacturer's written instructions. D. Maintain manufacturer's recommended clearances for service and maintenance. E. Install piping connections maintaining clearances for service and maintenance of chillers. F. Install differential pressure switches across chilled-water and condenser-water connections. G. Install flange connections at chillers. H. Install flexible pipe connections for chillers mounted on vibration isolators. I. Install MAIN shutoff valves at chiller inlet and outlet of both chilled-water and condenser-water connections. J. Install BYPASS MAIN shutoff valves which can short-circuit chiller inlet to outlet of both chilled-water and condenser-water connections. K. Install water strainers as required to the evaporator and condenser water systems. DECEMBER

9 ELECTRICAL CONNECTIONS A. Install all necessary electrical wiring devices and services such as fused disconnect switches or circuit breakers to power each module, phase loss monitors. Install all wires and cables routing between each module and the master controller. Install electrical service to the master control panel. All wiring is done in the field and shall be according to local and national electrical codes where applicable. B. Install and connect remote flow switches, temperature sensors, and remote chiller control panel. C. Ground equipment. D. Tighten electrical connectors and terminals, including grounding connections, according to manufacturers published torque-tightening values. Where manufacturer's torque values are not indicated, use those specified in UL 486A and UL 486B_ 3.06 FIELD QUALITY CONTROL A. Test and adjust controls and safeties. Replace damaged and malfunctioning controls and equipment CLEANING A. Clean finishes to remove dust and dirt. B. Touch up scratches in unfinished surfaces to restore corrosion resistance. C. Touch up scratches in finished surfaces to restore finish COMMISSIONING A. Manufacturer's Field Service: Engage a factory authorized service representative to inspect field assembled components and equipment installation, to include electrical and piping connections. Report results to A/E in writing. Inspection must include a complete startup checklist to include (as a minimum) the following: Completed Start-Up Checklists as found in manufacturer's IOM. B. Engage a factory authorized service representative to perform startup service. Verify water source for compliance with manufacturer's requirements for flow and temperature. Measure and record electrical values for voltage and amperage. Refer to Division 23 "Testing, Adjusting and Balancing" and comply with provisions therein. C. Engage a factory authorized service representative to train owner's maintenance personnel to adjust, operate and maintain the entire Make-Up Air unit. Refer to Division 01 Section Closeout Procedures and Demonstration and Training DEMONSTRATION DECEMBER

10 A. Factory-Authorized Startup Services: Engage a factory-authorized service representative to supervise startup services performed by an independent mechanical contractor provided by the Owner, and to demonstrate and train Owner's maintenance personnel as specified below. B. Train the Owner's maintenance personnel on procedures and schedules related to startup, shutdown, troubleshooting, servicing, and preventive maintenance. C. Review data in the operation and maintenance manuals. END OF SECTION DECEMBER

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