NORTH CLACKAMAS SCHOOL DISTRICT

REX PUTNAM HIGH SCHOOL CHILLER REPLACEMENT PROJECT

12400 SE FREEMAN WAY,

MILWAUKIE, OREGON 97222

(ITB-24-101)

ADDENDUM TWO (2) 24 September 2023

THE FOLLOWING CHANGES, ADDITIONS, AND DELETIONS TO THE CONTRACT DOCUMENTS

DATED 28 AUGUST 2023 HEREBY BECOME A PART OF THE CONTRACT DOCUMENTS.

NOTIFY ALL SUBCONTRACTORS AFFECTED BY THIS ADDENDUM.

Substitution Requests:

• Dunham Bush: Not approved, see Attachment A.

• Quantech: Not approved, see Attachment B.

Questions and Answers:

Question 1: Is there any possibility to extend completion date(s)?

Answer 1: No, the completion dates are non-negotiable and firm.

Question 2: Is a “witness test” required for Owner or Owner’s rep.?

Answer 1: No.

Attachments to this Addendum:

Attachment A: Dunham-Bus Substitution Request Findings.

Attachment B: Quantech Substitution Request Findings.

END OF ADDENDUM Two (2)

SYSTEM

DESIGN

CONSULTANTS, INC.

SUBMITTAL REVIEW

PROJECT NO: NCS2301

Submittal No.: Chiller Substitution Request 001

Date: September 19, 2023

System: CH-1

Reviewed By: Zachary Barber

This review is only for general conformance with the design concept of the project and general compliance with the information in the Contract Documents. Any action shown below is subject to the requirements of the Plans and

Specifications. Contractor is responsible for dimensions and quantity which shall be confirmed and correlated at the job site, fabrication processes and techniques of construction, coordination of the work with that of all other trades, and the satisfactory and safe performance of the work.

The following items have been reviewed for conformance with the requirements of the Contract Documents:

Disposition Code:

N – No exception taken. Resubmittal not required.

M – Make corrections noted. Resubmittal not required if installation complies with notes.

R – Revise and resubmit.

1 – Manufacturer not approved.

2 – Does not meet requirements of Contract

Documents.

3 – Insufficient information to review.

Item comments Disposition

CH-1: Dunham Bush, Model # AVX-BE R1

Not listed as an approved manufacturer. See Spec 23 64 00. R1

Number of installed Dunham Bush Chillers available for owner inspection within a 30-mile radius of project does not conform to Spec 23 64 00.

“Factory Witness Test” is not an acceptable alternative.

R2

Electrical MCA and MOCP requirements are higher than required by design.

No option for 115 VAC, 15 Amp convenience outlet provided. See Chiller

Equipment Schedule on Sheet M0.01.

R2

IPLV and EER are lower than required by design. See Chiller Equipment

Schedule on Sheet M0.01.

R2

333 S.E. SECOND AVENUE, SUITE 100

PORTLAND, OREGON 97214

T: 503 248 0227 FAX (503)248 02 40

www.sdcpdx.com

Attachment A http://www.sdcpdx.com/

SUBSTITUTION

CSI Form 1.5C REQUEST

(During the Bid Period)

Substitution Request Number: Project:

From:

Date: To:

A/E Project Number:

Contract For: Re:

© Copyright 2007, Construction Specifications Institute, 110 South Union Street, Suite 100, Alexandria, VA 22314

Page 1 Form Version: June 2004 CSI Form 1.5C

This is not an official CSI Construction Contract Administration (CCA) Form. Please use CSI's official CCA Forms if required by your project needs.

Specification Title: Description:

Section: Page: Article/Paragraph:

Proposed Substitution:

Manufacturer: Address: Phone:

Trade Name: Model No.:

Attached data includes product description, specifications, drawings, photographs, and performance and test data adequate for evaluation of the request; applicable portions of the data are clearly identified.

Attached data also includes a description of changes to the Contract Documents that the proposed substitution will require for its proper installation.

The Undersigned certifies:

• Proposed substitution has been fully investigated and determined to be equal or superior in all respects to specified product.

• Same warranty will be furnished for proposed substitution as for specified product.

• Same maintenance service and source of replacement parts, as applicable, is available.

• Proposed substitution will have no adverse effect on other trades and will not affect or delay progress schedule.

• Proposed substitution does not affect dimensions and functional clearances.

• Payment will be made for changes to building design, including A/E design, detailing, and construction costs caused by the substitution.

Submitted by:

Signed by:

Firm:

Address:

Telephone:

A/E’s REVIEW AND ACTION

Substitution approved - Make submittals in accordance with Specification Section 01 25 00 Substitution Procedures.

Substitution approved as noted - Make submittals in accordance with Specification Section 01 25 00 Substitution Procedures.

Substitution rejected - Use specified materials.

Substitution Request received too late - Use specified materials.

Signed by: Date:

Supporting Data Attached: Drawings Product Data Samples Tests Reports

Rex Putnam High School School Chiller ITB-24-101 001

Leif Palmer, palmerle@nclack.k12.or.us

Chiller

Dave Havelick

09/18/2023

North Clackamas School District

Air Cooled Chillers

23 64 00 1 Part 2, 2.1 A.

CH-1

Dunham-Bush Dunham-Bush

Homestead, FL 786-800-9999

Air Cooled Chiller

AVX-BE

Dave Havelick

503-703-2042

7412 SW Beaverton Hillsdale Hwy., Ste. 101, Portland, OR 97225

Sustainable Mechanical Systems

Dave Havelick x x

NCS2301

of 20

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INTRODUCTION

For more than 100 years, Dunham-Bush has focused on innovative product development. Today, we provide a full portfolio of HVAC/R products from Fan Coil Units to large centrifugal chillers as well as many other innovative green solutions. Our commitment to innovation, matched with an aggressive attitude toward growth, makes Dunham-Bush a leader in global markets. Our product development is tailored to meet the specific needs of customers, building-by-building, country-by-country and region-by-region. No other HVAC/R manufacturer takes this approach to meeting your performance expectations.

The Dunham-Bush name is synonymous worldwide with the Rotary Screw Compressor Chillers technology. With over 45 years of proven experience and track records in manufacturing and installation of Rotary Screw Compressors and chillers, thousands of our Chillers have clocked more than 100,000 operating hours without any compressor tear-out or overhaul! As a pioneer and industry leader in the Rotary Screw compressor technology for HVAC/R systems, Dunham-Bush now introduces the Air Cooled Rotary Screw Flooded Chillers with unsurpassed performance and reliability.

ACHELOUS, AVX-B Variable Speed Air Cooled Screw Chillers, have a cooling capacity range from 115 to 470 TR [406 to 1656 kW] using environmentally sound R134a refrigerant. The entire product line features high energy efficiency, installation ease, control flexibility, high reliability and advanced Vision 2020i controller. The AVX-B series are certified to AHRI Standard 550/590 and meets / exceeded ASHRAE Standard 90.1 requirements.

TABLE OF CONTENT

Page No Introduction Nomenclature General Characteristics Unit Features Options And Accessories Operating Benefits Physical Specifications Electrical Data

Page No Sound Pressure Data Dimensional Data Floor Loading Diagram Field Power & Control Wiring Schematic Application Data Minimum Clearance Requirements Guide Specifications

NOMENCLATURE

AVX - B 200 S - AU H R

Air Cooled Vertical Screw Flooded Chiller

Power Supply AU = 400V/3Ph/50Hz AT = 380V/3Ph/50Hz CB = 380V/3Ph/60Hz AR = 460V/3Ph/60Hz AS = 575V/3Ph/60Hz

No of Compressor S = Single Compressor T = Twin Compressors M = Twin Compressors Modular

Unit

Product Generation

- VFD High Efficiency Series

H = High Ambient S = Standard Ambient Q = Special

Packaged

Unit Model

- 3 -

GENERAL CHARACTERISTICS

UNIT FEATURES

GENERAL

16 models rated in accordance with AHRI standard conditions Built-in with Variable Frequency Drive (VFD) for compressor, no starter is required Direct-drive, twin screws compressors driven by

VFD offers superior part load energy efficiency Great improvement on Integrated Part Load Value

(IPLV), which rated in accordance with AHRI Standards 550/590-2011

Multiple compressors models with independent refrigerant system per compressor provide redundancy, and superior part load efficiency

The unit is designed to operates with R134a, the environment friendly refrigerant with zero ODP (Ozone Depletion Potential)

Substantially reduced operating sound level, especially at part-load operation; sound level can be reduced up to 12 dB(A) for twin compressors models at part load operation

Standard unit operating ambient temperature, 45~125°F [7~52°C], for high ambient series

Standard unit operating ambient temperature, 45~115°F [7~46°C], for standard ambient series

Units are ETL listed for North America and Canada regions.

Compressor New generation of Dunham-Bush MSC Vertical

Screw Compressors with Unique Patented Twin Screw compressor technology, offers further improved reliability and stability, with lower sound level

Optimized oil management with up to 2 integral oil separators. Multi-layered mesh element effectively separates oil from the gas stream

No external oil pump required Patented screw profile design which is specially made for R134a application, to assure operation at highest efficiencies

Optimized volume ratio, VI port position and geometry for best efficiency

Hermetic design eliminates casing leakage, with no requirement for internal parts service, no periodic compressor tear down and overhaul

Direct driven design eliminates gear set; improve efficiency and reliability

Discharge service valves is provided to each compressor for the ease of servicing

Evaporator Shell-and-tube flooded type heat exchanger Integral finned copper tubes to maximized heat transfer area Cleanable copper tubes for maintaining high efficiency Removable water heads for easy service Victaulic groove water connection comply to

ANSI/AWWA C-606

Standard with 1” thick closed cell insulation Standard relief valve(s) – 3/4” [19mm] FPT Pressure test up to 220psig for refrigerant side, and

195psig for water side Isolation valves for refrigerant filter dryers are provided to allow filter core replacement without pump down the chiller. This greatly improve the servicing expenses and time

V-coils configuration for small floor space requirement

VFD to optimized and improve part load efficiency

Controller for safety protections, precise and reliable control

Bolted construction for easy semi knockdown assembly at site in case of hoisting problem

Single point power termination for the ease of installation

Rigid structural steel base to prevent unit deflection and coils and piping damage during hoisting

Hermetic variable speed screw compressors

VFD driven fans to further enhanced unit part load efficiency

Heat exchangers with cleanable copper tubes and removable water heads for easy serviceability

Direct driven fans Economizer for increase capacity and improve efficiency

- 4 -

UNIT FEATURES

Condenser and Fans

Constructed with seamless inner-grooved copper tubes expanded into die-formed aluminum slit fins in staggered configuration

Leak and pressure test at 450psig [31bar] “V” coil design to increases condensing surface area to maximized heat rejection “V” coils arrangement with internal baffle for fan cycling and staging IP55, Class “F” insulation fan motors for outdoor applications

Variable Speed Drive (VSD)

Regulates motor speed to matched with capacity demand

Offers faster response on load changed, and precise capacity control

Soft start the compressor to minimized compressor inrush current to virtually, zero inrush current

Maintain displacement power factor at minimum

0.95 at all operating conditions

VFD on condenser fans to further improve part load energy efficiency as option

Electronic Expansion Valve Advanced electronic expansion valve (EEV) is used for precise control of liquid refrigerant flow into the evaporator

Evaporation of liquid refrigerant in evaporator is controlled at precise level for optimum performance

Economizer

The economizer circuit consists of plate type heat exchanger, expansion valve and solenoid valve

Liquid refrigerant is sub-cooled at economizer before entering the evaporator; the flash refrigerant from economizer is fed into vapor injection port of the compressor

The economizer increased cooling capacity by means of the sub-cooling

Cooling capacity is increased significantly with marginal increases in kW-input, thus, unit EER is improved

Control Panel

Weather tight electrical enclosure fabricated by heavy gauge sheet steel with powder coated baked finishing

Single point power connection for all models, except models AVX-B 470M which is modular units with dual power connection points as standard

Circuit breaker for compressors and condenser fan motors

Step down transformer for power supply to control circuit

Main power supply monitoring module. Protection on under or over voltage, phase reversal, phase losses and imbalance

Unit mounted Remote/Off/Local (R/O/L) selector, an operation and servicing friendly feature

Overload protection relay for compressors Vision 2020i – the state-of-art Dunham-Bush proactive advanced controller that adapts to any abnormal operating conditions and for safety protections

Chilled water pump control Emergency push stop button

VISION 2020i CONTROLLER

Vision 2020i a flexible and advance programmable microprocessor controller designed specifically for the application and precise control of Dunham-Bush Rotary Screw compressor chillers.

The controller is provided with a set of terminals that connect to various devices such as temperature sensors, pressure and current transducers, solenoid valves, compressors and fans starters, control relays, etc.

The unit algorithm program and operating parameters are stored in FLASH-MEMORY that does not require a back-up battery. The program can be loaded through PC or programming key.

Vision 2020i controller is equipped with a user friendly DBG5 graphical touch screen color display panel.

DBG5 display terminal has dedicated touch keys that provides easy access to the unit operating conditions, control set points, trend graphs and alarm histories.

Each unit’s controller can be configured and connected to the local DBLAN network that allows multiple units sequencing control without additional hardware. The DBLAN is local area network made up of several chillers’ controller.

- 5 -

Display and User Terminal Vision 2020i controller is designed to work with the DBG5 terminal display, a 7” TFT, 65k colors, LED backlight touch screen graphical display panel. DBG5 terminal display allows carrying out all program operations. The user terminal allows displaying the unit working conditions, compressor run times, alarm history and modifying the parameters. The display also has an automatically self-test of the controller on system start-

up. Multiple messages will be displayed by automatically scrolling from each message to the next.

All of these messages are spelled out in English language on the display terminal.

Touch keys on DBG5 graphical display panel allow user to access information and settings, based on security level of the password. For more detail operation of the Display Terminal, please refer to the Unit Operation Manual.

Easily accessible measurements include:

Leaving and entering chilled water temperature Rate of Change for leaving chilled water temperature Evaporator and condenser pressure Compressor discharge temperature and superheat Ambient temperature Current drawn by each compressor Compressor operating frequency Compressor capacity (percentage of FLA, Full Load

Amps) Run hours of each compressor Number of starts of each compressor Electronic Expansion Valve (EEV) Opening

Percentage Compressors and condenser fans motors status Oil Level Status, Water Flow Switch Status, Remote

Start/Stop Command Status Trend graph of leaving chilled water temperature

Capacity Control Leaving chilled water temperature control is accomplished by entering the water temperature setpoint and placing the controller in automatic control.

AVX-B chillers visualized precise capacity control thanks to the VFD controlled, direct driven compressor.

Vision 2020i monitors all control functions and regulates compressor motor speed to match closely to the actual building load requirement. This will put the chiller operation at optimum efficiency at all time, and thus, maximized the energy saving of the chiller plant operation.

The compressor ramp (loading) cycle is programmable and may be set for specific building requirements.

Remote adjustment of the leaving chilled water setpoint is accomplished either through High Level Interfacing (HLI) via BMS communication, or Low Level Interfacing (LLI) via an external hardwired, 4 to 20mA chilled water reset control signal. Remote reset of compressor current limiting function can be accomplished in a similar fashion.

System Control The unit may be started or stopped manually, or through the use of an external signal from a Building Automation System. In addition, the controller may be programmed with seven-day operating cycle or other Dunham-Bush control packages may start and stop the system through inter-connecting wiring.

System Protection The following system protection controls will automatically act to ensure system reliability:

Low evaporator pressure High condenser pressure Freeze protection Low suction-discharge pressure differential Low compressor oil level Compressor run error Power loss Chilled water flow loss Sensor error Compressor over current Compressor Anti-recycle High motor temperature Compressor overload VFD fault

The controller can retain up to 99 alarm histories complete with time of failure together with data stamping on critical sensor readings in an alarm condition. This tool will aid service technicians in troubleshooting tasks enabling downtime and nuisance trip-outs to be minimized.

Remote Monitoring And Control (Option) Dunham-Bush, the leader of HVAC solution provider understands the arising focus on chiller plant performance and optimization. Several solutions as below are offered to the building owner to achieved optimized chiller plant room controls, operation and performance.

Dunham-Bush Chiller Plant Manager (CPM) DB Chiller Plant Manager (CPM) is a trustworthy and headache-free solution for building owners and users on chiller plant control and automation system. CPM’s advanced controllers monitor and control equipments in chiller plant such as chillers, primary and secondary chilled water pumps, variable frequency drives (VFD), motorized valves, bypass modulating valves, and etc.

Field devices such as flow meters, BTU meters, digital power meters, sensors & transducers can be interfaced with CPM via HLI or LLI. CPM controls chillers and pumps sequencing, as well as lead-lag, duty-standby and alarm changeover operations.

NetVisorPRO – Monitoring software of CPM system which allows system monitoring, historical trending, and alarm logging to be carry out at a PC terminal.

Graphical animations on system operation, temperature and flow rate trend graphs, historical data and alarm history logs, settings changes are all available with NetVisorPRO.

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Chiller plantroom control and automation by Dunham- Bush CPM provides the owners with a chiller system in stable operation, optimized performance and energy efficiency.

DB-LAN Master Slave Sequencing Control

(MSS)

In a chiller system with multiple Dunham-Bush chillers, Vision 2020i controller of each chiller can be connected to the DB-LAN network via a communication bus without additional controller, to enable Master-Slave Sequencing Control of this chiller system. MSS will stage in/out chiller in operation to match building required cooling capacity. Chiller Lead-lag, duty-standby and alarm changeover controls are come with MSS, as well as the chilled water pumps control. Each MSS DB-LAN network can be connected up to 8 numbers of chillers.

Building Management System (BMS) Communication Vision 2020i is able to communicate to BMS through the add-on communication card via various common protocols as:

Modbus RTU RS485, ModBus TCPIP BACnet over IP, MS/TP, or PTP LONworks FTT 10

OPTIONS AND ACCESSORIES

Heat Recovery – The hot gas desuperheater; a shell-and-tube heat exchanger that reclaims ‘waste’ heat from compressor to produce hot water up to 55°C

Condenser Corrosion Protection – Copper (CU) fins or Hydrophilic coated fins are provided to give better corrosion protection. DB-COAT, the post-coated solution for condenser coil to provide extensive corrosion protection for harsh enviroment

Hotgas Bypass – To maintain unit operation below minimum unloaded capacity

Service valve – Compressor suction service valve is supplied to further isolate the compressor from evaporator

Flanged Semi-hermetic Compressor – Semi hermetic compressor is available on request

Low Ambient Operation (LA1)–Variable frequency drive (VFD) is incorporated to the condenser fan motor to allow unit operation down to 14 oF [-10 oC] ambient temperature

Extra Low Ambient Operation (LA2) – Add-on low ambient kit to allow unit operation down to -20°F [-29°C] ambient temperature Note: Please consult factory for LA2 option.

VFD on Condenser Fans – Condenser fan motors driven by VSD to further enhanced unit part load efficiency

Double Thick Insulation – Evaporator with double thick 2” [50mm] closed cell insulation, for extra resistance to condensation

Evaporator Anti-Freeze Protection – When chiller is not operating at ambient temperature 32°F [0°C] or below, the immersion heater and circulating pump will be in operation to prevent water freezing in evaporator

Protective Grille for Condenser Coil – To protect condenser coil from unauthorized access

Evaporator Flanged Water Connection – Flanged water connection is available as option

250 PSIG Working Pressure Vessel – Evaporator with 250 psig working pressure on water side

Compressor Acoustic Jacket - Compressor acoustic jacket can be added to further reduce the sound level

Dual Mode Operation – The unit with dual mode operation can deliver chilled fluid temperature down to 18°F [-7.8°C] during ice making mode. Units with Dual Mode Operation is used for Ice Thermal Storage System

Low Temp. Operation – The unit with Low Temp.

Operation can deliver chilled fluid temperature down to 18°F [-7.8°C] for process cooling application

ASME/ PED/ CRN Compliance – Evaporator with ASME/ PED/ CRN approval is available

CE Compliance – Unit with CE compliance is available on request

BMS Communication – Various add-on communication cards provide BMS communication via common protocols: Modbus RTU RS485 / TCPIP, LONworks FTT10, BACnet over IP / MSTP /

PTP

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OPTIONS AND ACCESSORIES

ELECTRICAL AND CONTROLS

Unit Mounted Main Disconnect Switch – Non-fused disconnect switch with external lockable handle is furnished to isolate unit main incoming power supply for servicing

Single Power Connection Point – Quick and easy field installation with one main power supply termination. (Applicable to Models AVX-B 470M only)

Ground Fault Interrupt (GFI) – Provides equipment with ground fault protection

Ammeter/ Voltmeter – Analog ammeter and voltmeter with 3 phase selector switch for indication, located inside the control panel

Chilled Water Reset/ Demand Limiting – Low level interfacing with Building Automation System (BAS). Chilled Water Reset allows controlled temperature setpoint to be reset by a 4-20mA signal from BAS; while Demand Limiting will limit the maximum current drawn by the compressors by 4- 20mA signal from BAS

System Voltage Measurement – System voltage option is a safety features to protect system from high and low voltage due to unbalance power supply. The controller will trigger alarm high or low voltage and cut-off running system

IP55 Control Panel – IP55 rated control panel can be supplied for harsh working environment

Factory Supplied, Field Installed By Customer

Evaporator Water Flow Switch– Flow switch to be installed at evaporator outlet piping as safety interlock to evaporator water flow status. Three options are available: Weather tight flow switch with CE mark; NEMA 1 and NEMA 4 rated flow switch

Rubber-In-Shear Isolators – Designed for ease of installation. These one-piece molded rubber isolators are applicable for most installations

Spring Isolators – These housed spring assemblies have a neoprene friction pad at the bottom to prevent the passage of noise, and a spring locking levering bolt at the top. Neoprene inserts prevent contact between the steel upper and lower housings. Suitable for more critical application as compared to rubber-in-shear isolator

DB-LAN Master Slave Sequencing Control (MSS)

– Pre-programmed at factory; field supplied and installed inter-connection wiring between chillers to provide communication bus among chillers’ controllers to enable Master-Slave Sequencing Control

Chiller Plant Manager (CPM) – Factory supplied control panel; field supplied and installed interconnection wiring and field devices; for complete chiller plantroom automation.

DB DIRECTOR

(For US Region Only)

DB-Director control system is offered to US region as an option to Vision 2020i control system.

DB-Director is a rugged microprocessor based controller designed for the the HVAC/R applications.

DB-Director provides flexibility with setpoints and control options that can be selected prior to commissioning a system or when the unit is live and functioning. Displays, alarms and other interfaces are accomplished in a clear and simple language that informs the user as to the status of the controller.

DB-Director is equipped with 128 x 64 pixels monochrome graphics LCD display with 2.8” diagonal viewing area, and 9 dedicated keys that enable user to access information, base on security level of the password. The user terminal is allows displaying and easy access to the unit working conditions, compressor run times, alarm histories and modify the parameters.

Multiple messages will be displayed by automatically scrolling from each message to the next. All of these messages are spelled out in English language on the display terminal.

The display also has an automatically self-test of the controller on system start-up. For more detail operation of the DB-Director keypad, please refer to the Unit operation Manual.

Remote Monitoring For DB-Director DB-Director is equipped with RS485 and Ethernet communication ports as standard. This user friendly design allows Building Management System (BMS) to interface directly with the chiller via either of Modbus RTU, Modbus IP, or BACnet IP communication protocol.

LONworks or BACnet MSTP communication protocol can be established with installation of external adapter.

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OPERATING BENEFITS

EFFICIENCY AND RELIABILITY

Energy Efficiency VFD driven compressor provides superior efficiency and sound level at part load Designed to provide the greatest amount of cooling for the least power input over the entire operating range of your building

Delivers outstanding efficiency and total energy savings through the utilization of economizer cycle and advanced controller staging; to produce greater capacity with fewer compressors

Maximized performance through optimized components matching and multiple compressors

High efficiency oil recovery system guarantees removal of oil carried over in the refrigerant and maintains the heat exchangers at their maximum efficiency at both full and part load

Refrigerant Compatibility

Designed to operate with environmentally sound and economically smart HFC-134a with proven efficiency and reliability

Consult Factory for use of other HFC refrigerants.

Flooded Evaporator

Flooded evaporator design that fully utilized and maximized the heat transfer area available in the evaporator; operates with lower suction superheat, smaller evaporator approach. These have greatly improved efficiency of chiller with flooded evaporator

Flooded evaporator water heads can be removed easily without dismantling the chilled water piping connections, for inspection and for mechanical tubes cleaning with brushes or auto-brush. This will enable low tube fouling factor in the evaporator to be ensured, thus maintaining system efficiency

Operational Advantages

Dramatic payback in reduced maintenance and overhaul costs both in downtime and in labor expenditures

Ease of troubleshooting through controller retention of monitored functions

Factory Testing

Each chiller undergoes the factory testing prior to unit shipment. This assures consistencies of workmanship at highest quality

Thus, all units shipped are completely factory tested; charged and adjusted according to the design parameters, for ease of installation and minimal field start-up adjustments

Control Flexibility Controller-based with DDC controller (direct digital control) features precise push button control over every aspect of operation with built-in standard features that maximized energy savings on start-up and throughout the life of your equipment

Ensured uniform compressor loading and optimal energy efficiency through controller to controls which utilize pressure transducers to measure evaporator and condenser pressure

Lower energy costs resulting from automatic load monitoring and increased accuracy and efficiency in compressor staging

Various communication options for remote monitoring of the unit operation

Proactive control anticipates problems and takes corrective action before they occur. Controls will unload compressor(s) if head or suction pressure approach limits. This will enable unit to stay on line while warning operator of potential problems

Stable and efficient operation with precise chilled water temperature control. Chilled water temperature is controlled at ±0.8 oF [0.5 oC] range for your comfort cooling, with best energy saving

REFRIGERATION CYCLE

Dunham-Bush rotary screw air cooled chillers are designed for efficiency and reliability. The rotary screw compressor is a positive displacement, variable capacity compressor that will allow operation over a wide variety of conditions.

The refrigerant management system is shown in the refrigerant cycle diagram.

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OPERATING BENEFITS

Liquid refrigerant enters the flooded evaporator uniformly where it absorbs heat from water flowing through the evaporator tubes. The vaporized refrigerant is then drawn into the suction port of the compressor where the positive displacement compression begins.

This partially compressed gas is then combined with additional gas from the vapor injection port at an intermediate pressure. Compressed gaseous refrigerant is then discharged into the integral oil separator where oil, which is contained in the refrigerant vapor, is removed and returned to the compressor oil sump.

Fully compressed and superheated refrigerant is then discharged into the condenser, where air is being drawn through the condenser tube by the propeller fan cools and condenses the refrigerant. The liquid refrigerant then passes through the economizer. A portion of liquid refrigerant is tapped passes through the expansion valve back into the economizer for further subcooling of main liquid refrigerant flow.

The gaseous refrigerant is then drawn out of the economizer and into the vapor injection port of the compressor. The remaining subcooled liquid refrigerant then passes through electronic expansion valve which reduces refrigerant pressure to evaporator levels where it is then distributed evenly into the evaporator.

With the additional subcooling, the enthalpy of the refrigerant flowing into the evaporator is reduced which increases the refrigeration effect and improves the efficiency of the refrigeration cycle.

Economizer/ Vapor Injection Cycle for Increase Capacity and Higher EER The renowned Dunham-Bush screw compressor allows for economizer vapor injection cycle to be incorporated, increasing capacity by significantly with marginal increase in kW-input. Thus, unit EER is improved!

PART-LOAD PERFORMANCE

Through the use of economizer, electronic expansion valve and multiple compressors, Dunham-Bush air cooled chillers have some of the best part-load performance characteristics in the industry when measured in accordance with AHRI Standard 550/590.

In most cases, actual building system loads are significantly less than full load design conditions, therefore chillers operate at part load most of the time.

Dunham-Bush air cooled chillers combine the efficient operation of multiple compressors with an economizer cycle and advanced controller to yield the best total energy efficiency and significant operating saving under any load.

When specifying air conditioning equipment, it is important to consider the system load characteristics for the building application. In a typical city, the air conditioning load will vary according to changes in the ambient temperature. Weather data compiled over many years will predict the number of hours that equipment will operate at various load percentages.

The Air Conditioning and Refrigeration Institute (AHRI) has established a system, in AHRI Standard 550/590, for measuring total chiller performance over full and part-load conditions. It defines the Integrated Part-Load Value (IPLV) as an excellent method of comparing diverse types of equipment on an equal basis. The IPLV is a single number estimate of a chiller’s power use weighted for the number of hours the unit might spend at each part-load point. IPLV’s are based on Standard Rating Conditions.

The formula for calculating an IPLV is:

IPLV =

where: A= kW/ton at 100% load point

B= kW/ton at 75% load point C= kW/ton at 50% load point D= kW/ton at 25% load point

0.01 + 0.42 + 0.45 + 0.12 A B C D

Project: Rex Putnam

Location:

Consultant: Alan Niles

Date: 9/15/23 1:42 PM

PERFORMANCE SUMMARY

Tag:

Location:

CHILLER AVX-BE-1

Screw Compressor Air Cooled Package Chiller

Model # AVX-BE 300T - ARSR Quantity 1 Rating version AVXB6 Manufacturer DBM

Physical Specifications

Compressor Qty 2 Length 425 1/4 In.

Width 88 In.

Height 98 In.

Shipping weight 21,325 Lbs.

Operating weight 22,207 Lbs.

Refrigerant R-134a Approx. refrigerant charge 683.4 Lbs.

Conditions of service

Percent of full load 100% Capacity (Tons) 306.2 Unit power (kW) 322.6

Compressor power (kW) 288.7 Total Fan Power (kW) 33.92 Cooling Efficiency (EER, Btu /W.hr) 11.39 IPLV.IP (EER, Btu /W.hr) 20.62

Evaporator

Model (Qty) S2RT(1) Fluid Water Fluid flow rate (USgpm) 734.9 Entering fluid temp. (°F) 54.00

Leaving fluid temp. (°F) 44.00 Fouling factor (hꞏft²ꞏ°F/Btu) 0.000100 Pressure drop (psi/ft.H2O) 8.57/19.8 Fluid freezing point (°F) 32.00

Condenser

Design ambient (°F) 95.0 Altitude (ft) 0.000 Fan Motor Power (kW) (Qty) 2.120 (16)

Electrical characteristics

Unit power supply 460V/3ph/60Hz Unit max. fuse size (A) 700 Unit rated load amps 480

Unit min. circuit ampacity (A) 532 Comp. rated load amps (A) 416 Comp. locked rotor amps (A) 1391/1295

Notes

- Certified in accordance with the AHRI Air Cooled Water- Chilling Packages Using the Vapor Compression Cycle Certification Program, which is based on AHRI Standard- 550/590(I-P) and AHRI Standard 551/591(SI). Certified units may be found in the AHRI Directory at www.ahridirectory.org.

- Meets ASHRAE 90.1-2019 Path A and Path B chiller minimum efficiency guidelines

- The electrical data is being projected base on 95F ambient temperature, Please consult factory for all other ambient temperature

IPLV.IP Points at Standard AHRI Rating Conditions

% Full load Tons Unit kW Comp. kW Fan kW Evap. EFT Evap. LFT EER Ambient(°F)

100% 306.2 322.6 288.7 33.92 54.00 44.00 11.39 95.0

75% 229.7 178.7 147.1 31.54 51.50 44.00 15.42 80.0

50% 153.1 76.12 72.64 3.480 49.00 44.00 24.14 65.0

25% 76.55 34.76 34.10 0.6600 46.50 44.00 26.43 55.0

375798 18-Sep-23 Page 2 of 4 SPEC ver. 7.0, 20218

Consultant: Alan Niles

Date: 9/15/23 1:42 PM

PERFORMANCE SUMMARY

Tag:

CHILLER AVX-BE-1

Part load points

% Full load Tons Unit kW Comp. kW Fan kW Evap. EFT Evap. LFT EER Ambient(°F)

100% 306.2 322.6 288.7 33.92 54.00 44.00 11.39 95.0

90% 275.6 260.8 226.9 33.92 53.00 44.00 12.68 89.0

80% 245.0 203.0 171.0 32.02 52.00 44.00 14.48 83.0

70% 214.3 152.7 126.8 25.93 51.00 44.00 16.84 77.0

60% 183.7 110.0 95.27 14.70 50.00 44.00 20.05 71.0

50% 153.1 76.12 72.64 3.480 49.00 44.00 24.14 65.0

40% 122.5 57.61 55.26 2.352 48.00 44.00 25.51 59.0

30% 91.86 42.05 40.83 1.224 47.00 44.00 26.21 55.0

20% 61.24 27.58 27.37 0.2022 46.00 44.00 26.65 55.0

10% 30.62 13.05 12.94 0.1067 45.00 44.00 28.16 55.0

Sound Data

Frequency (Hz) 63 125 250 500 1000 2000 4000 8000 Total dB(A)

Sound Pressure Level (free field) at 32.80 ft 48 54 55 61 65 59 52 44 68

*Sound Pressure Level (free field) ± 2 dB(A) Tolerance

Standard Equipment

Unit Construction

▪ Unit shall be constructed of heavy gauge G90 galvanized steel

▪ All sheet metal parts are painted with oven baked epoxy / polyester powder paint, sustaining 1000 hour salt spray test in accordance with ASTM B-117

▪ Rigid structural base to prevent unit deflection and damage during hoisting

▪ Bolted construction for easy semi knockdown at site in case of hoisting problem

▪ Control panel IP54

Warranty and Testing

▪ Standard one year warranty on unit and on compressors

▪ Factory run tested

Compressor

▪ Compartmentalized to reduce noise

▪ MSC rotary screw

▪ Cast iron housing

▪ IP21 Terminal box

▪ Variable Speed Control

▪ Suction check valve and discharge service valve

▪ Semi-hermetic design (optional)

▪ Compressor oil sump heater(s)

▪ Relief valve if required

▪ Optical oil level sensor

▪ Integral Oil separator

▪ Integral lubration system using pressure differential

▪ One (1) year warranty

▪ Compressor liquid injection, and vapour injection (only available in selected models)

▪ VFD

Air Cooled Condenser

▪ Inner ridged copper tubes

▪ 450 psig test pressure for condenser coils

▪ Low noise direct driven propeller and axial fans

▪ Galvanized steel tubesheet

▪ Close blade tip clearance with the fan venturis to assure smooth, quiet operation

▪ 6 pole fan motor, IP55, class F insulation

▪ EC fans to further improved part load efficiency

Evaporator

▪ Vessels constructed in accordance to ASME CODES Sections VIII Division I for unfired pressure vessels.

▪ Flooded design for higher capacity and easy maintenance

▪ Cleanable integral fin copper tubes for easy serviceability

▪ Removable water header

▪ Optional Flanged water connection for quick installation and/or service

▪ Full pump-down capacity in condenser, therefore, pump out unit not required

▪ 200 psig on refrigerant side design pressure

▪ 150 psig on water side design pressure

▪ "1"" thick PE foam closed cell evaporator insulation,thermal conductivity 0.040W/m.K at 40°C (0.28Btu in/hr.ft2°F at 104°F.)

▪ PE foam closed cell suction line insulation/thermal conductivity

0.040W/m.K at 40°C (0.28Btu in/hr.ft2°F at 104°F)

▪ Drain and vent plugs

▪ Carbon steel header, shell and tube sheet

▪ Relief valve

Refrigerant Specialties

▪ Liquid level float control

▪ Economizer to increase capacity (Only available in selected models)

▪ Sight glass with moisture indicator

▪ Replaceable core filter/drier

▪ Charging and gauge connections

▪ Pressure relief valve

▪ Refrigerant charge

375798 18-Sep-23 Page 3 of 4 SPEC ver. 7.0, 20218

Consultant: Alan Niles

Date: 9/15/23 1:42 PM

PERFORMANCE SUMMARY

Tag:

CHILLER AVX-BE-1

▪ Electronic Expansion Valve ▪ Oil charge

Standard Electrical Components

▪ Compressor circuit breaker and contactors

▪ Compressor overloads

▪ Low voltage/phase failure/phase reversal relay

▪ On-off in the unit control circuit and each compressor control circuit

▪ Fan control contactors

▪ Control circuit transformer

▪ Current transformer

▪ Ambient temperature sensor

Code Compliance

▪ Units conform to NEC, NEMA, ANSI/ASHRAE 15 and ANSI/ASME pressure vessel code

▪ Units conform and certified to ANSI/UL Std. 1995

▪ Rated in accordance with AHRI 550/590 std.

▪ ASME section 8, Division one for Unfired Pressure Vessel

Construction

Analog readouts

▪ Evaporator and condenser refrigerant pressure

▪ Compressor amps (each compressor)

▪ Water sensor: Evaporator leaving - Standard sensor to provide temperature readout for water leaving the evaporator.

Digital readouts

▪ Compressor contactor status

▪ Flow switch status

▪ Oil level status

▪ Number of compressor starts

▪ Elapsed compressor run time

▪ External enable/disable status

▪ Liquid injection solenoid state

Capacity control Set points

▪ Leaving fluid temperature

▪ Freeze protection temperature

▪ High and low pressure

▪ Amp limit

▪ Ramp up

Unit Protection

▪ High and low pressures

▪ High discharge temperature

▪ Freeze protection

▪ Low pressure differential

▪ Low oil level

▪ Compressor run error

▪ Power loss

▪ Chilled water flow loss

▪ High/Low System voltage

▪ Sensor error

▪ Compressor anti-recycle

Controls

▪ DB Director full function Windows based microcomputer controller on all models

▪ Two line 16 character alpha numeric display control functions

▪ Compressor loading/staging based on leaving fluid temperature

▪ Evaporator fluid freeze protection

▪ High and low pressure protection

▪ Staggered starting of compressors

▪ Anti-recycle timing

▪ Condenser fan speed control

▪ Pump down control

▪ Remote monitoring via RS-232 and RS-485 ports

▪ Accepts remote start & stop signal

▪ 0 to 5 VDC chilled water reset signal (standard)

▪ Keyboard accessed LCD readouts, continuously updated

▪ Discharge and suction pressure for all circuits

Optional Equipment/Service Included

Accessories (Shipped Loose)

▪ Rubber-in-shear isolators (RIS) - designed for ease of installation, these rubber, one piece, molded isolators have skid resistant baseplates. Applicable for most installations.

Dunham-Bush Industries Sdn. Bhd. (166302-K), Lot 5755-6, Kidamai Industrial Park, Bukit Angkat, 43000 Kajang, Selangor Darul Ehsan, Malaysia.

Tel:603-8924 9000 Fax:603-8739 5020 Email:info@dunham-bush.com

Page 4375798 SPEC ver. 7.0, 20218 of 418-Sep-23

- 15 -

10800 [425 1/4] MAX

10360 [407 7/8]

25 [1] 25 [1]

2490 [98] MAX

POWER ENTRY

BOTTOM

COMPRESSOR COMPARTMENT

COMPRESSOR

16 NOS OF

19 [3/4"]

MOUNTING HOLES

8 NOS OF

64 [2 1/2"]Ø

LIFTING

HOLES

ELECTRICAL CONTROL BOX

WATER INLET

Ø203 [8"]

EL

EC

TR

IC

AL

C

O N

TR

O

L

BO

X

CG1

CG1

2 NOS OF

PULLING HOLES

1397 [55] 1524 [60] 1143 [45]

762 [30] 635 [25]

889 [35] 1270 [50] 1524 [60]

CG1

WATER OUTLET

Ø203 [8"]

CONTROL

SWING

DOOR

DIMENSIONAL DATA

AVX-B 300T, 330T

otes: 1. All dimensions are in millimeters[inches].

2. Please consult factory for the details of the unit with UL certified VFD.

- 23 -

GUIDE SPECIFICATIONS

1.0 GENERAL

1.1 SUMMARY

Supply and commissioning of complete factory assembled air cooled screw chiller suitable for outdoor installation. The air cooled chiller shall contain rotary vertical screw compressor(s), evaporator, air cooled condenser with coil and fan, interconnecting refrigerant piping, electronic expansion valve, control panel, chilled liquid connections. The control panel shall be fully wired by the manufacturer to connect and interlock controller, starter, protection devices with electrical power and control connections. Packaged chiller shall be factory assembled, charged and run tested with a full operating refrigerant and oil charge. The refrigerant type shall be R134a and shall not have phasing out schedule.

Contractor shall furnish and install chiller as shown and scheduled on the drawings. Unit shall be installed in accordance with this specification.

1.2 QUALITY ASSURANCE

Chiller performance shall be rated in accordance to AHRI 550/590 standard latest edition

ASME standard B31.5 for Refrigerant piping Vessels shall be fabricated and pressure tested in accordance with ASME Boiler and Pressure vessel code, Section VIII, Division 1 “Unfired Pressure Vessels”

Manufacturer shall have experience of minimum 15 years in manufacturing Air Cooled Screw Chillers in their facility

Unit shall be manufactured in ISO9001 registered manufacturing facility

[OPTIONAL] ASHRAE Standard 15 safety code for mechanical refrigeration

[OPTIONAL] PED certification required in Europe market place

Factory run test: Chiller shall be pressure tested, evacuated and fully charged with refrigerant and oil.

The chiller shall be run tested with water flowing through the vessels

Manufacturer shall have a service organization with trained service personal

1.3 DESIGN BASE

The construction drawings indicate a system based on a selected manufacturer of equipment and the design data available to the Engineer during construction document preparation. Electrical services, size, configuration and space allocations are consistent with that manufacturer’s recommendations and requirements.

Other listed or approved manufacturers are encouraged to provide equipment on this project; however, it will be the Contractor and/or Supplier’s responsibility to assure the equipment is consistent with the design base. No compensation will be approved for revisions required by the design base or other manufacturers for any different services, space, clearances, etc.

1.4 DELIVERY, STORAGE AND

HANDLING

Unit shall be delivered to job site fully assembled with all interconnecting refrigerant piping and internal wiring ready for field installation and charged with refrigerant and oil by manufacturer. When delivered, machine shall be stored indoors, away from construction dirt, dust, moisture or any other hazardous material that would harm the chillers. Inspect under shipping tarps, bags, or crates to be sure there is no water collected during transit. Protective shipping covers shall be kept with the unit until machine is ready for installation.

1.5 WARRANTY

Chiller manufacturer’s warranty shall cover for 12 months from the date of start-up or 18 months from the date of shipment whichever is first. The start-up shall be carried out by a authorized service personnel and the warranty is limited to part replacement excluding labor and consumables such as refrigerant, oil & filter driers etc.

1.6 MAINTENANCE

Maintenance of the chillers will be the responsibility of the owner and performed in accordance with the manufacturer’s instructions

2.0 PRODUCTS

2.1 OPERATING REQUIREMENTS

The units will be furnished as shown on capacity schedules and drawings. Unit performance will be in accordance with AHRI Standard 550/590.

The unit shall be capable of starting up with entering fluid temperature to the cooler at 95°F [35oC].

The unit shall be capable to produce chilled fluid temperature between 40oF to 60oF [4.5oC to 15.6oC] at standard operating mode.

[OPTIONAL]:

A. Dual Mode operation – The unit shall capable for ice thermal storage applications with supply brine temperature down to 18oF [-7.8oC].

B. Low Temp. Operation – The unit shall capable for process cooling application with supply fluid temperature down to 18oF [-7.8oC].

The unit shall be design to operate at ambient temperature 45oF to 115oF [7oC to 46oC], with extended ambient temperature to 125oF [52oC] for high ambient operation.

A. Low Ambient Operation (LA1) – The unit shall capable to operate with ambient temperature down to 14oF [-10oC].

B. Extra Low Ambient Operation (LA2) – The unit shall capable to operate with ambient temperature down to -20°F [-29°C].

Unit shall be able to operate with 3-phase 50/60Hz power supply with voltage within +/- 10% of unit rated voltage.

Control Voltage shall be 115V/1ph/ 50/60Hz.

- 24 -

2.2 CONSTRUCTION

The unit panels, control boxes shall be constructed by heavy gauge, galvanized steel with powder coating baked finishing to pass 1000-hours salt spray test in accordance with ATSM B117 standard.

2.3 COMPRESSOR

The packaged chiller shall be furnished with direct drive, hermetic sealed, positive displacement rotary screw compressor(s), driven by a 3500 RPM-60Hz 2 pole motor.

Each compressor shall include integral oil separation system, oil sump and oil filter. The oil differential pressure shall be controlled during operation to maintain proper oil lubrication throughout the lubrication system. An electric oil heater shall be supplied with each compressor to maintain required oil temperature during shutdown period. The heater shall be energized when the chiller is switched off.

Each compressor shall have an oil level sight glass, suction check valve, suction filter and discharge service valve. Unit shall be provided with isolation valves to allow condenser to be used as a pump down receiver.

Compressor capacity control shall be obtained by Variable Frequency Driven motor in combination with slide valve at low load within each compressor. The bearing shall be heavy duty, anti-friction, anti-reverse tapered roller type, shall be able to carry both radial and thrust loads.

The compressor motor shall be hermetic refrigerant gas cooled, 2 pole, and squirrel cage induction type with class H insulation. Motor winding shall have thermistors embedded in the motor windings. The thermistors shall be wired to the solid state motor protection module to protect motor from overheating.

The compressor(s) shall be acoustically enclosed in a galvanized steel casings enclosure with perforated liner insulated with fiberglass for maximum sound absorption.

[OPTIONAL]:

A. Compressor Suction Service Valve – To further isolate compressor from evaporator.

B. Compressor Acoustic Jacket - For unit operation which require further sound reduction.

C. Flanged Semi-Hermetic Compressor – Semi-hermetic compressor shall be provided on request.

2.4 EVAPORATOR

Evaporator vessel shall be cleanable shell and tube, flooded type. Shell shall be fabricated from rolled carbon steel sheet with fusion welded seams or carbon steel standard pipes. End plates shall be of carbon steel with precision drilling, reamed in order to accommodate tubes. Intermediate tube support shall be in place to provide required tube support between tube sheets. Tubes shall be of copper, seamless, high efficient, internally enhanced and externally finned, mechanically expanded into fixed steel tube sheets.

Tube diameter shall be ¾ inch and thickness shall be

0.025 inch. The flooded evaporator shall have a built in distributor for feeding refrigerant evenly under the tube bundle to produce a uniform boiling action and baffle plates shall be provided to ensure vapor separation.

Water box shall be removable type for tube cleaning.

Water connections shall be with Victaulic grooves in compliance to ANSI / AWWAC-606. Vent and drain plugs are to be provided in water box. The shell side of the evaporator shall have pressure relief valve with provision for refrigerant venting.

Evaporator refrigerant side shall be designed and constructed in accordance with the ASME…