Amendment 00008.pdf

(x)

F11SOL10032

x x

3 copies of the amendment; (b) By acknowledging receipt of this amendment on each copy of the offer submitted; or (c) By separate letter or telegram which includes a reference to the solicitation and amendment numbers. FAILURE OF YOUR ACKNOWLEDGEMENT TO BE RECEIVED AT

THE PLACE DESIGNATED FOR THE RECEIPT OF OFFERS PRIOR TO THE HOUR AND DATE SPECIFIED MAY RESULT IN REJECTION OF YOUR OFFER. If by virtue of this amendment you desire to change an offer already submitted, such change may be made by telegram or letter, provided each telegram or letter makes reference to the solicitation and this amendment, and is received prior to the opening hour and date specified.

x

OCON

Washington DC 20013-7012

MRC 1200

P.O. BOX 37012

OCON

OCON

Washington DC 20013-7012

MRC 1200

P.O. BOX 37012

SMITHSONIAN INSTITUTION

06/08/2011000008

13. THIS ITEM ONLY APPLIES TO MODIFICATION OF CONTRACTS/ORDERS. IT MODIFIES THE CONTRACT/ORDER NO. AS DESCRIBED IN ITEM 14.

12. ACCOUNTING AND APPROPRIATION DATA (If required) is not extended.is extended, Items 8 and 15, and returning

Offers must acknowledge receipt of this amendment prior to the hour and date specified in the solicitation or as amended, by one of the following methods: (a) By completing

The above numbered solicitation is amended as set forth in Item 14. The hour and date specified for receipt of Offers

11. THIS ITEM ONLY APPLIES TO AMENDMENTS OF SOLICITATIONS

FACILITY CODE CODE

10B. DATED (SEE ITEM 13)

10A. MODIFICATION OF CONTRACT/ORDER NO.

9B. DATED (SEE ITEM 11)

9A. AMENDMENT OF SOLICITATION NO.

CODE

8. NAME AND ADDRESS OF CONTRACTOR (No., street, county, State and ZIP Code)

7. ADMINISTERED BY (If other than Item 6)CODE 6. ISSUED BY

PAGE OF PAGES

4. REQUISITION/PURCHASE REQ. NO.3. EFFECTIVE DATE2. AMENDMENT/MODIFICATION NO. 5. PROJECT NO. (If applicable)

1. CONTRACT ID CODE

AMENDMENT OF SOLICITATION/MODIFICATION OF CONTRACT

06/08/2011

CHECK ONE A. THIS CHANGE ORDER IS ISSUED PURSUANT TO: (Specify authority) THE CHANGES SET FORTH IN ITEM 14 ARE MADE IN THE CONTRACT

B. THE ABOVE NUMBERED CONTRACT/ORDER IS MODIFIED TO REFLECT THE ADMINISTRATIVE CHANGES (such as changes in paying office, C. THIS SUPPLEMENTAL AGREEMENT IS ENTERED INTO PURSUANT TO AUTHORITY OF:

D. OTHER (Specify type of modification and authority) appropriation date, etc.) SET FORTH IN ITEM 14, PURSUANT TO THE AUTHORITY OF FAR 43.103(b).

E. IMPORTANT: Contractor is not, is required to sign this document and return __________________ copies to the issuing office.

ORDER NO. IN ITEM 10A.

14. DESCRIPTION OF AMENDMENT/MODIFICATION (Organized by UCF section headings, including solicitation/contract subject matter where feasible.)

This is amendment number eight to Solicitation Number F11SOL10032 for the Renovation of the

Carnegie Mansion at the Smithsonian's Cooper Hewitt National Design Museum

1. Section 236420: Rotary Screw Water Chillers issued on May 19, 2011 as part of Addendum

No. 1 is deleted in its entirety and replaced herewith the attached revised Section 236426:

Water Cooled Modular Chiller. THIS PORTION OF THE AMENDMENT IS BEING REISSUED WITH

AMENDED SPECIFICATION 236426 ATTACHED AS IT WAS NOT DELIVERED TO THE PRINTER TIMELY.

2. Amendment 0009 will be issued early during the week of July 25, 2011.

Receipt for proposals is hereby extended to August 2, 2011 at 3:00 p.m. local time.

16A. NAME AND TITLE OF CONTRACTING OFFICER (Type or print)15A. NAME AND TITLE OF SIGNER (Type or print)

15C. DATE SIGNED 16B. UNITED STATES OF AMERICA 15B. CONTRACTOR/OFFEROR 16C. DATE SIGNED

(Signature of person authorized to sign) (Signature of Contracting Officer)

Dorothy A. Leffler

STANDARD FORM 30 (REV. 10-83)

Prescribed by GSA

FAR (48 CFR) 53.243

NSN 7540-01-152-8070

Previous edition unusable

Except as provided herein, all terms and conditions of the document referenced in Item 9A or 10A, as heretofore changed, remains unchanged and in full force and effect.

March 30, 2011 OFEO Project No. 0681105

WATER-COOLED MODULAR WATER CHILLERS 236426 - 1

SECTION 236426

WATER-COOLED MODULAR WATER CHILLERS

PART 1 - GENERAL

1.1 RELATED DOCUMENTS

A. Drawings and general provisions of the Contract, including General and Supplementary Conditions and Division 01 Specification Sections, apply to this Section.

1.2 SUMMARY

A. Section Includes:

1. Modular water-cooled, multiple-compressor chillers.

B. Related Section:

1. Division 28 Section "Refrigerant Detection and Alarm" for refrigerant monitors, alarms, supplemental breathing apparatus, and ventilation equipment interlocks.

C. Physical Size Limitations:

1. Due to space limitations, chiller shall not exceed physical size scheduled on the Drawings.

1.3 DEFINITIONS

A. BAS: Building automation system.

B. COP: Coefficient of performance. The ratio of the rate of heat removal to the rate of energy input using consistent units for any given set of rating conditions.

C. EER: Energy-efficiency ratio. The ratio of the cooling capacity given in terms of Btu/h to the total power input given in terms of watts at any given set of rating conditions.

D. IPLV: Integrated part-load value. A single-number part-load efficiency figure of merit calculated per the method defined by ARI 550/590 and referenced to ARI standard rating conditions.

E. kW/Ton (kW/kW): The ratio of total power input of the chiller in kilowatts to the net refrigerating capacity in tons (kW) at any given set of rating conditions.

F. NPLV: Nonstandard part-load value. A single-number part-load efficiency figure of merit calculated per the method defined by ARI 550/590 and intended for operating conditions other than ARI standard rating conditions.

1.4 PERFORMANCE REQUIREMENTS

A. Seismic Performance: Chillers shall withstand the effects of earthquake motions determined according to ASCE/SEI 7.

WATER-COOLED MODULAR WATER CHILLERS 236426 - 2

1. The term "withstand" means "the unit will remain in place without separation of any parts from the device when subjected to the seismic forces specified and the unit will be fully operational after the seismic event."

B. Condenser-Fluid Temperature Performance:

1. Startup Condenser-Fluid Temperature: Chiller shall be capable of starting with an entering condenser-fluid temperature of 40 deg F (4 deg C) and providing stable operation until the system temperature is elevated to the minimum operating entering condenser-fluid temperature.

2. Minimum Operating Condenser-Fluid Temperature: Chiller shall be capable of continuous operation over the entire capacity range indicated with an entering condenser-fluid temperature of 60 deg F (16 deg C).

C. Site Altitude: Chiller shall be suitable for altitude in which installed without affecting performance indicated. Make adjustments to affected chiller components to account for site altitude.

D. Performance Tolerance: Comply with the following in lieu of ARI 550/590:

1. Allowable Capacity Tolerance: Zero percent.

2. Allowable IPLV/NPLV Performance Tolerance: Zero percent.

1.5 SUBMITTALS

A. Product Data: For each type of product indicated. Include refrigerant, rated capacities, operating characteristics, furnished specialties, and accessories.

1. Performance at ARI standard conditions and at conditions indicated.

2. Performance at ARI standard unloading conditions.

3. Minimum evaporator flow rate.

4. Refrigerant capacity of chiller.

5. Oil capacity of chiller.

6. Fluid capacity of evaporator.

7. Characteristics of safety relief valves.

8. Fluid capacity of condenser and heat-reclaim condenser.

9. Minimum entering condenser-fluid temperature.

10. Performance at varying capacities with constant-design entering condenser-fluid temperature. Repeat performance at varying capacities for different condenser-fluid temperatures from design to minimum in 5 deg F (3 deg C) increments.

11. Minimum entering condenser-air temperature.

12. Maximum entering condenser-air temperature.

13. Performance at varying capacities with constant-design entering condenser-air temperature.

Repeat performance at varying capacities for different entering condenser-air temperatures from design to minimum in 10 deg F (6 deg C) increments.

B. LEED Submittal:

1. Product Data for Credit EA 4: Documentation required by Credit EA 4 indicating that equipment and refrigerants comply.

C. Shop Drawings: Include plans, elevations, sections, details, and attachments to other work.

WATER-COOLED MODULAR WATER CHILLERS 236426 - 3

1. Detail equipment assemblies and indicate dimensions, weights, load distribution, required clearances, method of field assembly, components, and location and size of each field connection.

2. Wiring Diagrams: For power, signal, and control wiring.

D. Coordination Drawings: Floor plans, drawn to scale, on which the following items are shown and coordinated with each other, using input from Installers of the items involved:

1. Concrete Pad.

2. Piping roughing-in requirements.

3. Wiring roughing-in requirements, including spaces reserved for electrical equipment.

4. Access requirements, including working clearances for mechanical controls and electrical equipment, and tube pull and service clearances.

5. Compliance with physical size limitations.

E. Certificates: For certification required in "Quality Assurance" Article.

F. Seismic Qualification Certificates: For chillers, accessories, and components, from manufacturer.

1. Basis for Certification: Indicate whether withstand certification is based on actual test of assembled components or on calculation.

2. Dimensioned Outline Drawings of Equipment Unit: Identify center of gravity and locate and describe mounting and anchorage provisions.

3. Detailed description of equipment anchorage devices on which the certification is based and their installation requirements.

G. Source quality-control reports.

H. Startup service reports.

I. Operation and Maintenance Data: For each chiller to include in emergency, operation, and maintenance manuals.

J. Warranty: Sample of special warranty.

1.6 QUALITY ASSURANCE

A. ARI Certification: Certify chiller according to ARI 550 and ARI 590 certification program(s).

B. ARI Rating: Rate chiller performance according to requirements in ARI 550/590.

C. ASHRAE Compliance:

1. ASHRAE 15 for safety code for mechanical refrigeration.

2. ASHRAE 147 for refrigerant leaks, recovery, and handling and storage requirements.

D. ASHRAE/IESNA Compliance: Applicable requirements in ASHRAE/IESNA 90.1-2004.

E. ASME Compliance: Fabricate and label chiller to comply with ASME Boiler and Pressure Vessel Code: Section VIII, Division 1, and include an ASME U-stamp and nameplate certifying compliance.

F. Comply with NFPA 70.

WATER-COOLED MODULAR WATER CHILLERS 236426 - 4

G. Comply with requirements of UL and UL Canada and include label by a qualified testing agency showing compliance.

1.7 DELIVERY, STORAGE, AND HANDLING

A. Ship chiller from the factory fully charged with refrigerant.

B. Ship chiller with a full charge of refrigerant. Charge each chiller with nitrogen if refrigerant is shipped in containers separate from chiller.

C. Ship each oil-lubricated chiller with a full charge of oil.

1. Ship oil factory installed in chiller.

D. Package chiller for export shipping in totally enclosed crate and bagging.

1.8 COORDINATION

A. Coordinate sizes and locations of concrete bases with actual equipment provided. Cast anchor-bolt inserts into bases.

B. Coordinate sizes, locations, and anchoring attachments of structural-steel support structures.

C. Coordinate size and location of chiller with actual space provided, and with the size of the MER access hatch for rigging.

1.9 WARRANTY

A. Special Warranty: Manufacturer's standard form in which manufacturer agrees to repair or replace components of chillers that fail in materials or workmanship within specified warranty period.

1. Extended warranties include, but are not limited to, the following:

a. Complete chiller including refrigerant and oil charge.

b. Complete compressor and drive assembly including refrigerant and oil charge.

c. Refrigerant and oil charge.

d. Parts and labor.

e. Loss of refrigerant charge for any reason.

2. Warranty Period: Five years from date of Substantial Completion.

PART 2 - PRODUCTS

2.1 OPERATING CONDITIONS

A. Provide water-cooled liquid chiller with the capacity as scheduled on drawings at job site elevation listed.

B. Chiller shall be designed to operate using R-410a refrigerant.

C. Chiller shall be designed for parallel evaporator water flow.

WATER-COOLED MODULAR WATER CHILLERS 236426 - 5

D. The liquid to be chilled will be water-containing corrosion inhibitors.

E. Chiller shall be designed to operate using 208 volt, 3 phase, 60 Hz electrical power supply.

2.2 WATER-COOLED PACKAGED CHILLER

A. Manufacturers: Subject to compliance with requirements, provide products by one of the following:

1. Arctichill

2. Multistack

B. System Description: Chiller shall incorporate compressors and consist of multiple 25-ton refrigerant circuits. Each evaporator and condenser shall be Shell & Tube heat exchanger. Each independent refrigerant circuit shall consist of an individual 13 HP compressor, condenser, evaporator, thermal expansion valve, and control system. Each circuit shall be constructed to be independent of other circuits from a refrigeration and electrical standpoint. The multi-circuit chiller must be able to produce chilled water even in the event of a failure of one or more refrigerant circuits. Each compressor shall be equipped with its own circuit breaker in the module.

Each module shall be equipped with circuit breaker built in to main panel integral to chiller. All electrical access shall be on one side.

C. General

1. Modules shall ship wired and charged with refrigerant. All modules shall be factory run tested prior to shipment.

2. Compressors, heat exchangers, piping and controls shall be mounted on a heavy gauge steel frame. Electrical controls, contactors, and relays for each module shall be mounted within that module. Water velocity in chiller main header must meet ASHRAE standard.

3. Modules to be factory supplied with terminals for single point power connection on one side of the chiller assembly. Chiller shall be equipped with circuit breaker with lockable handle ready for field wiring connection.

a. Disconnect means shall be interlocked with door operation.

b. Minimum withstand rating shall be as required by electrical power distribution system, but not less than 65,000 A.

4. 3’ clearance shall be provided on electrical access side and 3’ on opposite long side. No clearance shall be required on top of the chiller for the removal of the compressor.

D. Chilled and Condenser Water Mains: Each module shall include supply and return mains for both chilled and condenser water. Condenser water circuit in each module shall have built in shut off valves, strainer and if required 3 way water regulating valve. Chilled water circuit shall have built in - shut off valves and strainer. Also, two way on/off for VAV pumping operation as required.

E. Evaporators and Condensers: Each evaporator and condenser shall be shell & tube heat exchanger suitable for 150 psig for condenser and 150 psig for chilled water working pressure.

F. Compressor: Each module shall contain two compressors, independently circuited and with internal spring isolation mounted to the module with rubber-in-shear isolators. Each system also includes high discharge pressure and low suction pressure manual reset safety cutouts.

G. Each water circuit in each module shall have built-in water flow proving switch to prevent freeze-up of evaporator and to prevent nuisance tripping of the compressors due to high pressure in the condenser refrigerant circuit.

WATER-COOLED MODULAR WATER CHILLERS 236426 - 6

H. Foot Rails: The chiller shall be supplied with the appropriate length structural steel footrails to be placed upon the appropriate quantity of waffle type vibration isolation pads or vibration isolators.

Foot rails shall be supplied by mechanical contractors.

I. Chiller Control System.

1. Scheduling of the various compressors shall be performed by a microprocessor based control system (Master Controller). A new lead compressor is selected every 24 hours to assure even distribution of compressor run time. Master controller shall be remote wall mounting type and shall be a standard feature, non-standard controller is not acceptable.

Alarm shall be visual and audible.

2. The Master Controller shall monitor and report the following on each refrigeration system:

a. Discharge Pressure Fault

b. Suction Pressure Fault

c. Compressor Winding Temperature

d. Suction Temperature

e. Evaporator Leaving Chilled Water Temp.

3. The Master Controller shall monitor and report the following system parameters:

a. Chilled Water Entering and Leaving Temperature

b. Discharge Refrigerant Temperature

c. Chilled Water Flow

4. An out of tolerance indication from these controls or sensors shall cause a "fault" indication at the Master Controller and shutdown of that compressor with the transfer of load requirements to the next available compressor. In the case of a System Fault the entire chiller will be shut down. When a fault occurs, the Master Controller shall record conditions at the time of the fault and store the data for recall. This information shall be capable of being recalled through the keypad of the Master Controller and displayed on the Master Controller's LCD. A history of faults shall be maintained including date and time of day of each fault (up to the last 20 occurrences).

5. Individual monitoring of leaving chilled water temperatures from each refrigeration system shall be programmed to protect against freeze-up.

6. The control system shall monitor entering and leaving chilled water temperatures to determine system load and select the number of compressor circuits required to operate.

Response times and set points shall be adjustable. The system shall provide for variable time between compressor sequencing and temperature sensing, so as to fine-tune the chiller to different existing building conditions.

7. Chiller shall have external inputs and outputs to be compatible with the building management system to include chilled water supply and return temperature status, chiller set point, common alarm, chilled water flow and enable/disable, chilled water & hot water isolation valves position and status, chilled water pumps and pumps status.

8. Each refrigerant circuit shall include all refrigerant specialties to provide reliable operation.

9. Upon failure of microprocessor, each DX module shall operate independently.

2.3 SAFETIES, CONTROLS AND OPERATION

A. The chiller safety controls shall be provided (minimum) as follows:

1. Low evaporator refrigerant pressure

2. Loss of water flow through the evaporator

3. High condenser refrigerant pressure

4. High compressor motor temperature

WATER-COOLED MODULAR WATER CHILLERS 236426 - 7

5. Low suction gas temperature

6. Low leaving evaporator water temperature

B. Failure of chiller to start or chiller shutdown due to any of the above safety cutouts shall be enunciated by display of the appropriate diagnostic description at the unit control panel. This annunciation will be in plain English. Alphanumeric codes shall be unacceptable.

C. The chiller shall be furnished with a Master Controller as an integral portion of the chiller control circuitry to provide the following functions:

1. Provide automatic chiller shutdown during periods when the load level decreases below the normal operating requirements of the chiller. Upon an increase in load, the chiller shall automatically restart.

2. The control panel shall provide alphanumeric display showing all system parameters in the English language with numeric data in English units.

D. Normal Chiller Operation

1. When chiller is enabled, the factory supplied Master Controller modulates the chiller capacity from minimum to maximum as required by building load.

2. The Chiller control system shall respond to Entering Water Temperature and will have an integral reset based on entering water temperature to provide for efficient operation at part-load conditions.

E. Chiller shall have a single point power connection for entire chiller.

F. Manual Isolation Valves

1. Each (evaporator and condenser) heat exchanger's supply and return water connection shall contain manual valve to allow isolation of the individual water circuit from the chiller water main.

2. It shall be possible to isolate any water circuit of any module without shutting off the remaining modules, thus keeping the chiller in operation.

2.4 NORMAL CHILLER OPERATION

A. When chiller is enabled, the factory supplied Master Controller modulates the chiller capacity from minimum to maximum as required by building load.

B. The Chiller control system shall respond to Entering Water Temperature and will have an integral reset based on entering water temperature to provide for efficient operation at part-load conditions.

C. Manufacturer to provide start up supervision, operator training and lifetime troubleshooting supervision.

2.5 SOURCE QUALITY CONTROL

A. Perform functional tests of chillers before shipping.

B. Factory run test each water-cooled chiller with water flowing through evaporator and condenser.

C. Factory performance test water-cooled chillers, before shipping, according to ARI 550/590.

1. Test the following conditions:

a. Design conditions indicated.

WATER-COOLED MODULAR WATER CHILLERS 236426 - 8

b. Reduction in capacity from design to minimum load in steps of 10 with condenser fluid at design conditions.

c. Reduction in capacity from design to minimum load in steps of 10 with varying entering condenser-fluid temperature from design to minimum conditions in 5 deg F (3 deg C) increments.

d. At four point(s) of varying part-load performance to be selected by SI at time of test.

2. Allow SI access to place where chillers are being tested. Notify COTR 14 days in advance of testing.

3. Prepare test report indicating test procedures, instrumentation, test conditions, and results.

Submit copy of results within one week of test date.

D. Factory sound test water-cooled chillers, before shipping, according to ARI 575.

1. Test the following conditions:

a. Design conditions indicated.

b. Chiller operating at calculated worst-case sound condition.

c. At four point(s) of varying part-load performance to be selected by SI at time of test.

2. Allow SI access to place where chillers are being tested. Notify COTR 14 days in advance of testing.

3. Prepare test report indicating test procedures, instrumentation, test conditions, and results.

Submit copy of results within one week of test date.

E. Factory test and inspect evaporator and condenser according to ASME Boiler and Pressure Vessel Code: Section VIII, Division 1.

F. For chillers located indoors, rate sound power level according to ARI 575.

PART 3 - EXECUTION

3.1 EXAMINATION

A. Examine chillers before installation. Reject chillers that are damaged.

B. Examine roughing-in for equipment support, anchor-bolt sizes and locations, piping, and electrical connections to verify actual locations, sizes, and other conditions affecting chiller performance, maintenance, and operations before equipment installation.

1. Final chiller locations indicated on Drawings are approximate. Determine exact locations before roughing-in for piping and electrical connections.

C. Proceed with installation only after unsatisfactory conditions have been corrected.

3.2 CHILLER INSTALLATION

A. Install chiller on concrete pad or two straight rails to cover all modules.

B. Equipment Mounting: Install chiller using restrained spring isolators. Comply with requirements for vibration isolation devices specified in Division 23 Section "Vibration and Seismic Controls for HVAC Piping and Equipment."

1. Minimum Deflection: 1 inch (25 mm).

WATER-COOLED MODULAR WATER CHILLERS 236426 - 9

C. Maintain manufacturer's recommended clearances for service and maintenance.

D. Charge chiller with refrigerant and fill with oil if not factory installed.

E. Install separate devices furnished by manufacturer and not factory installed.

F. Installing contractor is responsible for supplying vibration eliminators, foot rails, flow switches for chilled and condenser water pipes, strainers, piping, power wiring, electrical disconnects and control wiring and all other contractors supplied accessories mentioned in all the above sections.

G. General

1. Familiarization of equipment and its supporting documentation, site preparation, installation, installation of factory supplied field installed components (pressure taps, piping drains and sensor pockets), assembly, busbar, wiring and piping connections between modules, preparation of water systems (flush, fill, purge, leak test and water treatment), water treatment, power wiring, piping, control wiring and coordinating with the manufacturer’s representative for commissioning and owner training of the installed equipment.

H. Mechanical Responsibilities

1. Manufacturer's representative to supervise the mechanical contractor’s assembly of the chiller.

2. Review chiller installation manual.

3. Supply steel footrails of appropriate length

4. Supply suitable vibration eliminators.

5. Place steel footrails on floor.

6. Install vibration eliminators at designated intervals under each footrail.

7. Place the modules on the footrails.

8. Align and bolt modules to each other.

9. Attach junction box.

10. Fit gaskets and couplings supplied by manufacturer to each header stub between modules.

11. Install header blank ends.

12. Install (4) wells for temperature sensors.

13. Provide and install flow switch in chilled and condenser water pipes.

14. Fill, purge and leak test water system.

15. Provide venting for refrigerant as required by code.

16. Complete the pre-commissioning checklist prior to request for start-up.

17. Assemble and install the cabinetry upon start-up.

18. Install the computer drawer, interconnect the internal electronic control stations between modules and master computer.

19. Manufacturer's representative to perform check test and start-up supervision and provide operator training.

I. Electrical Responsibilities

1. Manufacturer's representative to supervise the electrical contractor’s assembly of the internal wiring system of the chiller.

2. Control interlock connections.

3. Install the internal wiring system.

4. Terminate three-phase power at the junction box.

5. Provide and install disconnect switches for power feeds.

WATER-COOLED MODULAR WATER CHILLERS 236426 - 10

3.3 CONNECTIONS

A. Comply with requirements for piping specified in Division 23 Section "Hydronic Piping" and Division 23 Section "Refrigerant Piping". Drawings indicate general arrangement of piping, fittings, and specialties.

B. Install piping adjacent to chiller to allow service and maintenance.

C. Evaporator Fluid Connections: Connect to evaporator inlet with shutoff valve, strainer, flexible connector, thermometer, and plugged tee with pressure gage. Connect to evaporator outlet with shutoff valve, balancing valve, flexible connector, flow switch, thermometer, plugged tee with shutoff valve and pressure gage, flow meter, and drain connection with valve. Make connections to chiller with a flange or mechanical coupling.

D. Condenser Fluid Connections: Connect to condenser inlet with shutoff valve, strainer, flexible connector, thermometer, and plugged tee with pressure gage. Connect to condenser outlet with shutoff valve, balancing valve, flexible connector, flow switch, thermometer, plugged tee with shutoff valve and pressure gage, flow meter, and drain connection with valve. Make connections to chiller with a flange or mechanical coupling.

E. Refrigerant Pressure Relief Device Connections: For chillers installed indoors, extend separate vent piping for each chiller to the outdoors without valves or restrictions. Comply with ASHRAE 15. Connect vent to chiller pressure relief device with flexible connector and dirt leg with drain valve.

F. Connect each chiller drain connection with a union and drain pipe, and extend pipe, full size of connection, to floor drain. Provide a shutoff valve at each connection.

3.4 PIPING SYSTEM FLUSHING PROCEDURE

A. Prior to connecting the chiller to the condenser and chilled water loop, the piping loops shall be flushed with a detergent and hot water (110-130° F) mixture to remove previously accumulated dirt and other organic . In old piping systems with heavy encrustation of inorganic materials consult a water treatment specialist for proper passivation and/or removal of these contaminants.

B. During the flushing 30 mesh (max.) Y-strainers (or acceptable equivalent) shall be in place in the system piping and examined periodically as necessary to remove collected residue. The flushing process shall take no less than 6 hours or until the strainers when examined after each flushing are clean. Old systems with heavy encrustation shall be flushed for a minimum of 24 hours and may take as long as 48 hours before the filters run clean. Detergent and acid concentrations shall be used in strict accordance with the respective chemical manufacturer’s instructions. 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.

C. Prior to supplying water to the chiller the water treatment specification shall be consulted for requirements regarding the water quality during chiller operation. The appropriate chiller manufacturer’s service literature shall be available to the operator and/or service contractor and consulted for guidelines concerning preventative maintenance and off-season shutdown procedures

WATER-COOLED MODULAR WATER CHILLERS 236426 - 11

3.5 STARTUP SERVICE

A. Engage a factory-authorized service representative to perform startup service.

1. Complete installation and startup checks according to manufacturer's written instructions.

2. Verify that refrigerant charge is sufficient and chiller has been leak tested.

3. Verify that pumps are installed and functional.

4. Verify that thermometers and gages are installed.

5. Operate chiller for run-in period.

6. Check bearing lubrication and oil levels.

7. For chillers installed indoors, verify that refrigerant pressure relief device is vented outdoors.

8. Verify proper motor rotation.

9. Verify static deflection of vibration isolators, including deflection during chiller startup and shutdown.

10. Verify and record performance of fluid flow and low-temperature interlocks for evaporator and condenser, condenser, and heat-reclaim condenser.

11. Verify and record performance of chiller protection devices.

12. Test and adjust controls and safeties. Replace damaged or malfunctioning controls and equipment.

B. Inspect field-assembled components, equipment installation, and piping and electrical connections for proper assembly, installation, and connection.

C. Prepare test and inspection startup reports.

3.6 DEMONSTRATION

A. Engage a factory-authorized service representative to train SI's maintenance personnel to adjust, operate, and maintain chillers. Video record the training sessions.

END OF SECTION