Attachment 1 - Technical Specifications.pdf

Embassy of The United States of America

Rome, Italy

U.S. EMBASSY ROME

MSB YCC CHILLER REPLACEMENT

Facility Management

12/06/2024

SENSITIVE BUT UNCLASSIFIED

1. FOREWORDS

The Embassy of the United States in Rome needs to award a contract for the installation of a new air conditioning system at the Mel Sembler Building located in Rome in Via Sallustiana 49, Rome

2. GENERAL

• The premises where this project is taking place is the Mel Sembler Building located in

Rome in Via Sallustiana 49, Rome

• The contractor shall supply all the installation materials and equipment, skilled and unskilled labor, technical supervision, as well as logistic and administrative support.

The contractor shall also supply all accessory services such as: transportation, leasing, equipment and tools, disposal of debris, cleaning the work area and anything else necessary to complete the project in compliance with the present specifications

• Maximum attention is required for the safety of personnel at work on the site. The workers shall operate in compliance with standard codes. Since the work site consists of crucial technical installations, temporary safety protection measures towards third parties and workers shall be installed with care and attention, especially for the hours when site is closed.

• The Contractor shall be responsible for submitting, for approval by the COR, samples of materials and supplies to be used.

• It shall be Contractor's responsibility to verify all the quantities and dimensions.

• Work execution special care:

• Protection in place: Provide protection to existing historic materials wherever encountered adjacent to work or along paths of travel to prevent damage to or marring of materials, surfaces, and finishes. Such protection shall be freestanding of the object or surface itself whenever possible and of sufficient size and thickness to withstand impact from falling debris; rolling objects such as equipment, machinery, and handcarts; movement of materials and debris; and residue from flame cuttings such as sparks. Provide all necessary and related parts, devices, lifts, scaffolding and anchors required for complete protection installation.

• Provide protection in place to protect objects from dust and construction activities.

Provide appropriate and sufficient protection for immovable fixtures and finishes as indicated on attached inventory. Typical protection may include rigid protection to prevent surface abrasion and impact damage, and/or soft protection to cushion over-lying rigid protection and to prevent surface damage from materials that stain or abrade (such as dust). Protection materials will be water-resistant but sufficiently permeable to permit moisture evaporation to prevent biological growths. Protection materials will be installed in such a way that historic materials and finishes are not damaged.

• Protection shall prevent damage to all existing historic building elements and finishes, including but not limited to walls, floors, ceilings, moldings, decorative relief, stairs and handrails, and other artwork and architectural features remaining in-situ.

Cover and protect furniture, equipment, switch plates, covers, lighting fixtures, and all decorative items from damage and soiling, if such items were not removed prior to the start of the work.

• Maintain all protection devices in sound condition until completion of the work.

Repair or replace protection devices as necessary to maintain effectiveness of protection.

Art. 2.1 DEFINITIONS A glossary of terms and relative equivalents used in the drawing up of the tender documents are indicated hereunder:

Client, Administration, Project Supervisor, COR, CO: all these denominations identify the technical administrative staff, predisposed to handle the contract on behalf of the Embassy of the United States of America.

Contracting Company, Contractor: all these denominations identify the subject that undertakes to carry out the work described in the contract.

Contract, Purchase Order (P.O.), Work Order: these terms identify the contract document with which the project is awarded. The Client at his indisputable judgement shall make the formal selection of the different types of documents.

Art. 2.2 DESCRIPTION OF WORK

The work consists of the removal of the existing air-cooled chiller and associated buffer tank and the installation of a new reversible heat pump.

The work consists in:

• Site preparation including fences, provisional staging area, move of furniture, protection of materials and furniture, protection of floors and walls.

• Removal of all furniture that may impact on the correct execution of the work and transportation to a storage location as directed by the COR, within the Tri-Missions Campus.

• Removal and disposal of the existing the existing air-cooled chiller and associated buffer tank. The Contractor will provide disposal certificates to the COR.

• Supply and installation of new piping, manifolds, valves, strainers, thermometers (scale range: 0-90 C, Class 1), pressure gauges (scale range: 0-6 bar, Class 1), expansion tanks as per drawings. Piping shall be treated with anti-rust. All equipment shall be PN16

• Supply and installation of new flexible, closed-cell insulation material with built-in Microban® antimicrobial protection to protect the piping (AF/Armaflex Class 0) and of aluminum finishing.

• Supply and installation of a new air-cooled reversible heat pump, with 2 scroll compressors and have a heating/cooling capacity of 68 kW. The new unit shall be equipped with built-in pumps and buffer tank. Refrigerant gas shall be R454B.

• Supply and installation of a new 80 liters expansion tank on the return pipe.

• Supply and installation of an automatic make-up water filling unit with pressure gauge and hydraulic disconnector (BA type) to be connected to the return piping of the systems

• Supply a new TRACER SC+ and an UC600 control panel

• Create new graphic pages and configure the new reversible heat pump on the BAS as per table below. All the IT work needed to configure the reversible heat pump on the existing BAS (graphic pages, equipment operation rules, etc.) shall be performed by a TRANE authorized technician.

• Remove existing electrical cables and EMT.

• Supply and install a new cable FG16OM16 0,6/1 kV, Cca-s1,d1,a1, 5G16 from the

P3/D distribution panel located at the third floor to the new Chiller DP to be installed on the roof.

• Supply and installation of new EMT for the new cable

• Supply and installation on the roof of a new wall mounted IP 65, with terminals and solid door, electrical distribution panel. Supply and install the new electrical cables as described below. The new panel shall be composed of:

o Disconnector: 4 poles 63 A o Magneto thermic and GFCI serving the Heat Pump: 4 poles, type C, In: 63A, Ith:63A, Idn: 0.50 (AC type), Im: 630A, Icu/Icn: 10kA – electrical cable:

FG16OM16 0,6/1 kV, , Cca-s1,d1,a1, 5G16

• Test and balance of the system. Start-up of the unit must be performed by Manufacturer’s authorized technicians

• Final cleaning of the premises.

BUILDING AUTOMATION SYSTEM

All the newly installed equipment shall be able to be operated by the Building Automation System (TRANE TRACER SUMMIT).

Equipment/Points Bi Ai Bo Ao Cp

HEAT PUMP

Start/Stop

Evaporator pump control

Mode selection 1

Evaporator water flow presence 1

Alarms history 1

Status 1

Supply water Set-Point

Set-Point

Return water temperature

Supply water temperature

Points Total 4 3 2 1 0

Equipment/Points Bi Ai Bo Ao Cp

PUMPS

Pump 1 status 1

Pump 2 status 1 Pump 1 alarm 1 Pump 2 alarm 1 Pump 1 command 1 Pump 2 command 1 Points Total 4 0 2 0 0

Art. 2.3 LIMITATIONS

The accomplishment of the project shall be circumscribed to the specific requests described in the Tender Documents.

Art. 2.4 MATERIAL EQUIVALENTS The contractor shall verify and ensure that all the materials supplied are new and without defects and that their use and/or installation is carried out using the best techniques and fully respecting the instructions supplied by the manufacturers.

Special parts shall be manufactured solely by workshops that are highly qualified in that specific sector.

The makes indicated in this SOW (Scope of Work) are intended as a point of reference and therefore, the words or approved equivalent are implicit.

Therefore, the makes and products listed are to be deemed equivalent to each other.

Different selections implemented by the Contractor shall be approved in advance by the COR, after submission of samples and technical cards.

REVERSIBLE HEAT PUMP

TRANE

www.trane.com

CXAX026LN

EXPANSION TANK

CALEFFI

www.caleffi.com 80 liters

CIRCUIT BREAKER

ABB

www.abb.it

BAS

TRANE

www.trane.com

TRACER SC+

UC600

Art. 2.5 TENDER DOCUMENTS The following documents shall form an integral part of the contract:

- The present Special Tender Document

- General Conditions in use by the

Client

- Drawings M101, M102, M103, E101

- Bill of quantities

Art. 2.6 RESIDENTIAL SMOKING POLICY U.S. Tri-Mission Rome Employee Residential Smoking Policy Tri-Mission residential services are performed by direct-hire LES. and Embassy contractors.

This smoking policy has been established for the following reasons:

To protect individuals from second-hand smoking To avoid setting off alarms and smoke detectors To maintain a clean workplace To avoid fires from discarded cigarettes

Any LES or Embassy Contractor working in/on a Government Owned residential compound/property or in a owned or leased residence will follow the rules listed below:

No smoking is allowed on the compound or inside any government-owned residence.

No smoking is allowed inside a government owned or leased residence

No smoking is allowed on terraces, in common areas, or parking lots.

No smoking is allowed in any enclosed spaces.

Smoking is allowed outside the gates of a compound or a residential building only. Any person found to be in violation of the above rules will be escorted off the property immediately, reported to the Facility Manager and or GSO, and face immediate disciplinary action.

For questions, concerns, or reporting of a violation please call Facility Management or GSO at X2132 or RomeFACResMaintenanc@state.gov.

mailto:RomeFACResMaintenanc@state.gov

3. SOLICITATION CHARACTERISTICS

Art. 3.1 IMPLEMENTATION PHASE

• The work-site shall be kept as clean as possible.

• Areas for storing material shall be agreed upon, together with the COR, based on logistical-operative criteria.

• Any temporary interruptions of utilities shall be scheduled at least 5 days in advance and shall be subject to approval from the COR.

• Tests on the correct operation of the systems and consignment of parts of completed work shall be carried out in the presence of the person designated by the contractor and someone authorized by the Embassy. The contractor shall be responsible for drawing up the necessary delivery reports for the work and systems carried out and shall be subject to verification and acceptance by the COR.

Art. 3.2 CONCLUSION PHASE

• Once the project is completed a final inspection shall be carried out with representatives of the contractor and the Embassy, in order to verify that the project has been carried out correctly, that it is in compliance with the technical specifications and that the systems operate correctly.

• When the work has been completed and accepted by the Embassy, the contractor shall submit to the Embassy’s Technical Office the documents required in the contract.

Art. 3.3 WORK PROGRESS In general, the Contractor shall have the faculty of developing the work in the way he believes more convenient and shall hand it over completed within the terms of the contract, as long as, in the opinion of the Project Manager, this is not detrimental to the outcome of the project and the interests of the Administration.

The Administration reserves the right to request that a specific task be carried out within a pre-determined period of time, or to dispose the order of the performance of the work in the way it deems more convenient, especially in relation to requirements depending on the performance of work and delivery of supplies excluded from the contract, without the Contractor having the possibility to refuse or ask for special compensation.

Before starting the work, the Contractor shall submit for the COR approval a detailed operative schedule and costs, which he will follow during the performance of the contract, in concurrence with the schedule.

Art. 3.4 PARKING No parking is allowed inside Embassy grounds. The Contractor's vehicles shall be allowed to enter only for loading and unloading materials.

Loading and unloading operations shall be carried out using only one vehicle at a time.

Consequently, during the accomplishment of the project the Contractor shall ensure that its vehicles are parked at its own expense outside the Government property.

4. SPECIFICATION

1 BASIC MECHANICAL MATERIALS AND METHODS

1.1 APPLICABLE PUBLICATIONS

The publications listed below form a part of this specification to the extent referenced. The publications are referred to in the text by the basic designation only.

Italian National Institute for the Unification of Standards (UNI) Publications Sheet Metal and Air-Conditioning Contractors' National Association (SMACNA) Publications

• Testing, balancing and adjusting of environmental systems.

• Directive 2009/125/EC of the European Parliament and of the Council of 21 October 2009 establishing a framework for the setting of ecodesign requirements for energy-related products

• HVAC duct construction standards.

• HVAC Air Duct Leakage Test Manual.

• National Fire Protection Association (NFPA) Publications

• 90A-93 Standard for the installation of air conditioning and ventilating systems

• 90B-93 Installation of warm air heating and air conditioning systems

1.2 SUBMITTALS

All submittals shall be translated into English. Submit shop drawings, manufacturer's data, publication compliance, certified test reports and manufacturer's certificates of compliance for equipment, materials and finish, and pertinent details for each system where specified in each individual section, and have them approved before procurement, fabrication or delivery of the items to the job site. Partial submittals will not be acceptable and will be returned without review. Submittals shall include the manufacturer's name, trade name, country of origin, catalog model or number, nameplate data, size, layout dimensions, capacity, project specification and the specific technical paragraph reference which specifies each item, applicable U.S., Italian or European Standard, industry and technical society publication references, and other information necessary to establish contract compliance of each item to be furnished.

1.3 SHOP DRAWINGS

Drawings shall be a minimum of 210 mm by 275 mm in size. Drawings shall include floor plans, sectional views, wiring diagrams, and installation details of equipment; and equipment spaces identifying and indicating proposed location, layout and arrangement of items of equipment, control panels, accessories, piping, ductwork, and other items that must be shown to assure a coordinated installation. Wiring diagrams shall identify circuit terminals, and indicate the internal wiring for each item of equipment and the interconnection between each item of equipment. Drawings shall indicate adequate clearance for operation, maintenance and replacement of operating equipment devices.

If equipment is disapproved, drawings shall be revised to show acceptable equipment and be resubmitted prior to proceeding with the work.

1.4 MANUFACTURER'S DATA

Submittals for each manufactured item shall be manufacturer's descriptive literature of catalogued products, equipment drawings, diagrams, performance and characteristics curves, and catalog cuts.

1.5 PUBLICATION COMPLIANCE

Where equipment or materials are specified to conform to industry and technical society publications of organizations such as International Standards Organization Publications (ISO) and Italian National Institute for the Unification of Standards Publications (UNI) proof of such compliance shall be submitted. The label or listing by the specified organization will be acceptable evidence of compliance. In lieu of the label or listing, submit a certificate from an independent testing organization adequately equipped and competent to perform such services, and approved by the Contracting Officer, stating that the item has been tested in accordance with the specified organization's publication. Where equipment or materials are specified to conform to publications, the manufacturer of the product shall submit a certificate of compliance stating the equipment or materials meet or exceed the performance, design, and product requirements of the referenced publications.

1.6 CERTIFIED TEST REPORTS

The testing requirements in referenced publications for materials will be waived provided that the manufacturer's original certificates are submitted stating that previously manufactured materials have been tested by approved laboratories, that such materials meet testing requirements specified, and that the materials furnished for this project are of the same type, quality, manufacture and make as those tested; copies of the test reports don’t need to be submitted except as specifically requested by the Contracting Officer’s Representative.

1.7 MANUFACTURER'S CERTIFICATES OF COMPLIANCE

Submit certification from manufacturer attesting that materials and equipment to be furnished for this project comply with the requirements of this specification and of the referenced publications. Pre-printed certifications will not be acceptable; certifications shall be manufacturer's original certifications and shall be no more than one year old. The certification shall not contain statements that could be interpreted to imply that the product does not meet all requirements specified, such as "as good as;" "achieve the same end use and results as materials formulated in accordance with the referenced publications;"

"equal or exceed the service and performance of the specified material." The certification shall simply state that the product conforms to the requirements specified. Certificates shall be signed by the manufacturer's official authorized to sign certificates of compliance.

1.8 POSTED OPERATING INSTRUCTIONS

Furnish approved operating instructions for each principal item of equipment for the use of operation and maintenance personnel. The operating instructions shall include wiring diagrams, control diagrams, and control sequence for each principal item of equipment.

Operating instructions shall be printed or engraved, and shall be framed under glass or in approved laminated plastic and posted where directed. Operating instructions shall be attached to or posted adjacent to each principal item of equipment including start up, proper adjustment, operating, lubrication, shut-down, safety-precautions, procedure in the event of equipment failure, and other items of instruction as recommended by the manufacturer of each item of equipment. Operating instructions exposed to the weather shall be made of weather-resisting materials or shall be suitably enclosed to be weather protected. Operating instructions shall not fade when exposed to sunlight and shall be secured to prevent easy removal or peeling. Operating instructions shall be dual language (English and Italian).

1.9 OPERATION AND MAINTENANCE MANUAL

Furnish an operation and maintenance manual in both the Italian and English language for each item of equipment. Furnish three copies of the manual bound in hardback binders and digital copy or an approved equivalent. Furnish one complete manual prior to the time that equipment tests are performed and furnish the remaining manuals before the contract is completed. Inscribe the following identification on the cover: the words OPERATION AND MAINTENANCE MANUAL, in both the Italian and the English languages, the name and location of the equipment or the building, the name of the Contractor and the contract number. The manual shall include the names, addresses and telephone numbers of each subcontractor installing equipment, and of the local representatives for each item of equipment. The manual shall have a table of contents and be assembled to conform to the table of contents with the tab sheets placed before instructions covering the subject.

The instructions shall be legible and easily read, with large sheets of drawings folded in.

The manual shall include: wiring and control diagrams with data to explain detailed operation and control of each item of equipment; a control sequence describing start-up, operation and shut-down; description of the function of each principal item of equipment;

the procedure for starting; the procedure for operating; shut-down instructions; installation instructions; maintenance instructions; lubrication schedule including type, grade, temperature range and frequency; safety precautions, diagrams and illustrations; test procedures; performance data; and parts lists. The parts list for equipment shall indicate the sources of the supply, recommended spare parts and the service organization which is reasonably convenient to the project site. The manual shall be complete in all respects for equipment, controls, accessories, and associated appurtenances provided.

1.10 INSTRUCTIONS TO PERSONNEL

Furnish the services of competent instructors to give full instruction to the personnel in the adjustment, operation and maintenance, including pertinent safety requirements of each item of equipment and each system. Each instructor shall be thoroughly familiar with all parts of the installation and shall be trained in operating theory as well as practical operation and maintenance work. Instruction shall be given during the first regular work week after the equipment or system has been accepted and turned over for regular operation. Provide 1 workday (8-hours) of instruction to cover all operation and maintenance of equipment and control systems. Instructor shall use the Division “Operation and Maintenance Manual” as a basis for the training. Provide two complete manuals to the Owner for the training.

1.11 DELIVERY AND STORAGE

Properly store, adequately protect and carefully handle equipment and materials to prevent damage before and during installation. Handle, store, and protect equipment and materials in accordance with the manufacturer's recommendations. Replace damaged or defective items.

1.12 CATALOGUED PRODUCTS

Materials and equipment shall be cataloged products of manufacturers regularly engaged in production of such materials or equipment and shall be manufacturer's latest design that complies with the specification requirements. Materials and equipment shall duplicate items that have been in satisfactory commercial or industrial use. Where two or more items of the same class of equipment are required, these items shall be products of a single manufacturer; however, the component parts of the items need not be the products of the same manufacturer. Each item of equipment shall have the manufacturer's name, address, model number and serial number of the nameplate securely affixed in a conspicuous place; the nameplate of the distributing agent will not be acceptable.

1.13 VERIFICATION OF DIMENSIONS

Coordinate the proper relation of the work to the building structure and to the work of all trades. Visit the premises and become familiar with the dimensions in the field, and advise the Contracting Officer’s Representative of any discrepancy before performing any work.

1.14 MANUFACTURER'S RECOMMENDATIONS

Where installation procedures or any part thereof are required to be in accordance with the recommendations of the manufacturer of the material being installed, printed copies of these recommendations shall be furnished to the Contracting Officer prior to installation.

Installation of the item will not be allowed to proceed until the recommendations are received. Failure to furnish these recommendations can lead to the rejection of the material.

1.15 PAINTING OF NEW EQUIPMENT

Equipment painting, factory applied, or shop applied, shall be as specified herein, and provided under each individual section of this specification.

1.15.1 FACTORY PAINTING SYSTEMS

Manufacturer's standard factory painting systems may be provided. If manufacturer's standard factory painting system is being proposed for use in lieu of the shop painting systems, certifications that the manufacturer's standard factory painting system conforms to the heat resistance requirement shall be submitted.

1.15.2 SHOP PAINTING SYSTEMS

Clean, pretreat, prime and paint metal surfaces except aluminum surfaces that shall not be painted. Apply coatings to clean dry surfaces. Clean the surfaces to remove dust, rust, oil and grease by wire brushing and solvent degreasing prior to application of paint, except metal surfaces subject to temperatures exceeding 50oC shall be cleaned to bare metal.

Where more than one coat of paint is specified, apply the second coat after the preceding coat is thoroughly dry. Lightly sand damaged painting and retouch before applying the succeeding coat. Finished coat color shall be aluminum or light gray.

1.15.3 IDENTIFICATION OF PIPING

All piping except sanitary waste and vent shall have color-coded identification.

Identification may be by painting and stenciling or by the use of plastic pressure-sensitive adhesive tape installed at maximum 3-meter intervals, and at all horizontal/vertical changes in direction, and at all taps (tees). Piping, except sprinkler systems, shall be identified by black lettering (fluid identification and service i.e. supply or return, and direction of flow) stenciled or lettered on a color-coded background. Color coding shall be in accordance with UNI 5634. Background colors shall be a minimum of 300 mm by 50 mm with minimum 50 mm letters. Identification shall be provided in English and Italian and placed on piping so that it is easily visible.

2 CHILLER

2.1 GENERAL

The production of chilled water is through an air-cooled factory assembled chiller, selected according to the size and capabilities provided.

The cooling unit must be designed for outdoor applications, strictly in accordance with the technical specifications and comes with a full operating charge of refrigerant and lubricating oil, inverter controlled scroll compressors and electronic expansion valve.

2.2 Dimensions

The overall dimensions for the units between 40 and 80 kW must be less than 3 m².

The documentation includes an installation manual, operation and maintenance, user's guide, wiring diagram and dimensional drawings and is located within the control panel.

2.3 Quality Assessment

The units are designed and manufactured under a system of quality certification and an environmental management system certified in accordance with ISO 9001 and 14001.

The chillers production must follow a precise quality plan to ensure the adequacy of the construction and proper functioning of the product, including the testing of electrical sequence.

2.4 CONSTRUCTION

The casing of the chiller unit and the electrical panels are produced in galvanized steel

1.5 mm thick and mounted on a base of steel profiles riveted, fully painted. The panels, frames and steel surfaces exposed unit are painted and have a corrosion resistance of 1,500 hours in salt spray, according to ISO 9227 The electrical panel must have a minimum degree of protection equivalent to IP54, it must be fully mounted and wired in the factory, it must have an access door clearly visible from the outside, with a precise indication of the presence or absence of the supply voltage.

2.5 COMPRESSORS AND MOTORS

The chiller comes with:

• Hermetic scroll compressor

• Inverter direct drive

• Hermetic motor cooled by suction gas

• Centrifugal pump oil built

• Sight glass for oil level and oil charging valve incorporated

The compressor motor has a voltage utilization range of ± 10% of nameplate voltage. For maximum protection, they will be included relays motor protection against overload of internal temperature and power.

2.6 EVAPORATOR

The evaporator consists of a heat exchanger brazed plate, stainless steel 316 L and brazing with copper, designed to operate correctly and efficiently with a refrigerant charge.

The maximum working pressure on the water side must not exceed 1 MPa. The evaporator must be fully insulated with a closed cell insulation of appropriate thickness and protected against freezing with a heater actuated by command or with a sequence of activation of the pump, when the ambient temperature is less than 3 °C. The evaporator also must have only one connection for the water in the inlet and only one connection for the outgoing water.

The chiller must be able to ensure the temperature indicated below for the water leaving the evaporator:

For residential applications: between 5 °C and 18 °C To process applications:

or between -12 °C and 5 °C for cooling only units or between -10 °C and 5 °C for units with a heat pump

2.7 COILS AND FANS

Scheme operating temperature:

Cooling only: from 0 °C (-18 °C with an option for low ambient temperature) up to 46 °C Heating mode: from -15 °C to 20 °C

2.8 COILS FOR HEAT PUMP UNIT

The condensing coil is realized with aluminum fins mechanically bonded to copper tubes without welding and is equipped with an integral subcooling circuit. The coils will be subjected to a leak test in the factory to 13 MPa underwater. In case of installation of the unit in the corrosive environment, the aluminum fins will be pre-coated with epoxy resin gold color with minimum thickness of 8 pm, so as to resist to 1,000 hours of salt spray test as provided for by the ISO 9227 standard.

The coolers must be equipped with axial condenser fan and motor with ball bearings greased for life and overload protection external. The fan motors must be Class F and powered by an electric box IP55.

2.9 COOLING CIRCUIT

Each refrigerant circuit includes compressor / s, transducer high and low pressure, filter drier permanent, electronic expansion valve, the pressure outlet of each refrigerant line, full operating charge of refrigerant and oil, dual pressure switch for high pressure side.

2.10 OIL MANAGEMENT

The chiller must be equipped with an oil management system consisting of an oil pump integrated in the compressor, which ensures optimal circulation of the oil throughout the unit, and by a crankcase heater integrated in the compressor, which allows to avoid the start-up with a low oil temperature. The unit must have an operating charge of oil supplied and factory test.

2.11 CONTROL PANEL

The control panel must be weather-resistant, and the power panel must have a degree of protection of IP54, with single-point connection with disconnect and fuses. The isolator must be mechanically connected to disconnect power from the power supply board and must be accessible from the outside of the cooler. All components and control cables must be numbered according to IEC 60750.

Each compressor must have a direct starter in line mounted, wired and tested at the factory.

2.12 CHILLER CONTROL SYSTEM

To control the temperature of the chilled water will be used a control device with microprocessor which will serve for the monitoring of the water temperature and the coolant and the pressure of the refrigerant. The control system must be able to generate an adequate functional diagnosis.

The control microprocessor will be supplied assembled, completely wired, configured and tested at the factory and must ensure sequence functions compressor and fan (load control), fault detection, diagnosis and monitoring.

The control system of the operation of the chiller must have the following features

• High security and low-pressure refrigerant

• Checking the load limit in order to limit the load of the compressor in case of high return water temperature

• Activation Order condenser fan with automatic switching on and off in response to the condensation pressure environment

• Protection timing adjustable anti-recycle compressors

• Automatic sequence of the compressors, to balance the operating hours and start-ups

• Protection against reverse phase / single-phase operation

• Control block for low temperature with adjustable setpoints

• RS485 serial port for connectivity integrated BMS

• Options for communication protocols: Modbus, BACnet and LonTalk

The user interface is available on the outside wall of the refrigerator and allows complete management through graphical icons and touchscreen

• Adjusting chilled water setpoint output

• Display of water temperature in and out

• Pressure of the capacitor to the circuit

• Suction pressure circuit

• Ambient air temperature

• Condensing temperature circuit

• Suction temperature for circuit

Safety Check on the user's display

• Detect Low chilled water temperature

• High pressure coolant

• Loss of chilled water

• Contact stop external circuit

• Overload motor current

• Phase Reversal / imbalance / phase operation

• Failure of the water temperature sensor output used for the setpoint

• State / off compressor

Submissions They should submit the refrigeration unit indicating:

a) Model number catalog

b) Manufacturer

c) Information on the size

d) Cooling and/or heating capacity

e) ESEER and SCOP

f) Refrigerant type

g) Compressor type

h) Cooling and heating working area

i) Total power of the sound specified on each octave band

j) Pressure drop specified

3 CHILLED WATER AND HOT WATER PIPING

3.1 APPLICABLE PUBLICATIONS

The publications listed below are part of this specification to the extent referenced. the publications are referred to in the text by the basic designation only.

ITALIAN NATIONAL INSTITUTE FOR THE UNIFICATION OF STANDARDS (UNI)

PUBLICATIONS:

UNI-ISO 228/1 (2003) Pipe Threads Where Pressure-Tight Joints are not Made on the Threads. Designation, Dimensions and Tolerances

UNI-ISO 7/1 (1994) Pipe threads where pressure-tight joints are made on the threads Dimensions, tolerances and designation

UNI 2251 (1967) Metallic pipe flanges. Oval screwed flanges.

Nominal pressure PN6.

UNI 2252 (1967) Metallic pipe flanges. Oval screwed flanges.

Nominal pressure PN16.

UNI EN 10255 (2007) Non-Alloy steel tubes suitable for welding and threading - Technical delivery conditions

UNI EN 1057 (2010) Copper and Copper Alloys. Seamless, Round Copper Tubes for Water and Gas in Sanitary and Heating Applications.

UNI EN 1092-1 (2018) Flanges and their joints - Circular flanges for pipes, valves, fittings and accessories, PN designated - Steel flanges

INTERNATIONAL ORGANIZATION FOR STANDARDIZATION (ISO) PUBLICATIONS:

ISO 5252 Steel Tubes - Tolerance Systems.

3.2 SUBMITTALS

1) Manufacturer's Literature and Data:

a) Pipe and fittings

b) Gaskets, joints, end connections

c) Gate valves

d) Globe valves

e) Check valves

f) Ball valves

g) Calibrated balancing valves

h) Pump suction diffuser

i) Butterfly valves

j) Strainers

k) Flexible connections

l) Pumps (Data shall include pump curve with pump selection indicated, impeller size, rpm, pressure and flow)

m) Chemical feed tank

n) Expansion tank - chilled water system and fittings

o) Expansion tank - hot water system and fittings

p) Pressure gauges and thermometers

q) Air separators

r) Suction diffuser

s) Heat tracer tape

2) Operation and Maintenance Manuals: Coordinate with Section 15050, "Basic Mechanical

Materials and Methods". For each pump system. (Pumps, chemical feed, and flow measuring equipment.) Posted operating instructions. Piping diagrams and codes.

3) Welder's Qualification Documents.

4) Submit to the Government 1:50 scale layout shop drawings, fully dimensioned, of all piping, showing all valves, pumps, tanks, boilers, chillers, and vibration isolators in the equipment rooms. The drawings shall be submitted to the Government for approval. Provide set of drawings on mylar sepias at the completion of the job as an as-built record.

3.3 WELDING

3.3.1 Welding Procedure

Before any welding is performed, the Contractor shall submit three copies of his welding procedure specification for all metals included in the work. All welding shall be performed in accordance with Italian National Welding Institute Publications.

3.3.2 Performance Qualification Record

Before any welder or operator shall perform any welding the Contractor shall submit to the Contracting Officer three copies of the Welder's Performance Qualification Record showing that the welder was tested under the approved procedure specification submitted by the Contractor. In addition, the Contractor shall submit each welder's assigned number, letter, or symbol which shall be used to identify the work of the welder which shall be affixed immediately upon completion of the weld. Welders making defective welds after passing a qualification test shall be required to take a requalification test. Welders failing the requalification tests will not be permitted to work under this contract.

3.4 DESCRIPTION OF WORK

The piping systems as specified in this section include chilled water, hot water piping and cold drain piping from drain pans, tubing, flanges, bolting, gaskets, valves, fittings, flow measuring equipment, flow control equipment, circulating pumps.

3.4.1 Rotating Equipment Safety

Couplings, motor shafts, gears and other exposed rotating or rapidly moving parts shall be fully guarded. The guards shall be cast iron or expanded metal. Guard parts shall be rigid and suitably secured and shall be readily removable without disassembling the guarded unit.

3.5 PIPING, FITTINGS, AND ACCESSORIES

Piping systems as used in this paragraph include chilled water and hot water piping systems. Piping systems shall be compatible with system fluids, and capable of the pressures and temperatures indicated on the drawings and shown in the specifications.

Provide increasers where flanges and equipment connections are less than full line size.

3.5.1 Hot Water and Chilled Water Piping

Provide Type C, (conforming to UNI EN 1057), copper pipe or butt-welded or flanged black steel pipe conforming to UNI EN 10255. Piping 50 mm and smaller may be hard drawn copper tubing for above ground water piping use conforming to UNI EN 1057 Type B. Piping 65 mm and larger shall be butt welded or flanged black steel pipe conforming to UNI EN 10255.

3.5.2 Fittings for Steel Hot Water and Chilled Water Piping

Fittings sized 50 mm and smaller shall be threaded malleable iron. For pipe sized over 50 mm, the fittings shall be steel butt-welding or flanged type. Flanges shall be welding neck type. All fittings shall be suitable for 860 kPa hot and cold water service.

3.6 COPPER COLD DRAIN PIPING

Provide copper tubing in accordance with paragraph entitled “Copper Tubing” for piping sizes 25 mm and smaller. Provide copper tubing and solder point fittings for piping sizes larger than 25 mm. In lieu of copper tubing, 32 mm Schedule 40 polyvinyl chloride (PVC) plastic pipe, fittings, and solvent cement may be provided.

3.7 FITTINGS FOR COPPER TUBING

Fittings for copper tubing shall be wrought copper solder joint type.

3.8 UNIONS

3.8.1 Unions for Steel Pipe

Threaded.

3.8.2 Unions for Copper Tubing

Bronze, Solder joint end type.

3.8.3 Dielectric Union

Provide insulated union of galvanized steel and female threaded ends. Union shall have water and steam impervious insulation barrier capable of limiting galvanic current to one percent of the short circuit current in a corresponding bimetallic joint. When dry insulation barrier shall be able to withstand a 600 V breakdown test.

3.9 FLANGES

The raised faces shall be removed when used with flanges having a flat face.

3.10 END CONNECTIONS

3.10.1 Steel Piping

50 mm and smaller shall be screwed or socket welded; steel piping 65 mm and larger shall be flanged or butt welded.

3.10.1.1 Bolting of Flanges

Bolts or studs shall extend completely through the nuts and may have reduced shanks of a diameter not less than the diameter at root of threads. Carbon steel bolts shall have regular square or heavy hexagon heads and shall have heavy semi-finished hexagonal nuts.

3.10.1.2 Gaskets

Fluorinated elastomers, suitable for the pressure and temperature ranges encountered.

3.11 Butt Weld Joints

Provide backing rings for all field joints. Ferrous rings shall be of good weldable quality and shall not exceed 0.05 percent sulphur; for alloy pipe, backing rings shall be of material compatible with the chemical composition of the parts to be welded and preferably of the same composition. Backing rings shall be of the continuous machined or split bank type.

3.11.1 Joints for Copper Tubing

Grade 95-5, tin-antimony alloy for pressure up to 1000 kPa.

3.12 VALVES

All valves (except balancing and control valves) shall be full line size of pipe. Balancing and control valves shall be sized for flow and pressure required. Gate, globe, check, special, and related equipment shall conform to the following paragraphs. Valves shall have rising stems and shall open when turned counterclockwise. Valves shall be rated at a minimum of 1000 kPa.

3.12.1 Gate Valves

3.12.1.1 Bronze Gate Valves, 50 mm and Smaller

Bronze gate valves, 50 mm and smaller, of the wedge disc, rising stem, inside screw type, threaded end connections, and shall be not less than PN 10.

3.12.1.2 Cast-Iron Gate Valves, 65 mm and Larger

Cast iron gate valves shall be PN 16 with threaded end connections. Valves shall be open stem and yoke type with valve trim of bronze.

3.12.2 Globe Valve

3.12.2.1 Bronze Type 50 mm and Smaller

Shall be PN 16, except that PN 10 valves with solder ends may be used for copper tubing. All valves shall have renewable seats and discs except solder end valves which shall have integral seats.

3.12.2.2 Cast-Iron Type 65 mm and Larger

PN 10 shall have bronze trim, and shall be provided with tapped drains and brass plugs.

3.12.3 Check Valves

3.12.3.1 Bronze Type 50 mm and Smaller

Shall be of the regrinding swing check type, and shall be PN 16.

3.12.3.2 Check Valves 50 mm and Smaller

Shall have bolted caps.

3.12.3.3 Cast-Iron Check Valves 65 mm and Larger

PN 10 shall have bronze trim, and shall be of the non-slam, eccentric disc type for centrifugal pump discharge service.

3.12.4 Ball Valves

PN 10, brass body with stainless steel ball with removable handle.

3.12.5 Drain Valves

Shall be gate valves. Shall not be smaller than 20 mm nominal pipe size, shall have threaded ends, and shall be provided with hose nipple adapters for connecting a hose to lead to a convenient floor drain. The valves shall be manually operated.

3.12.6 Air Vent Valves

Shall be manually-operated general service type. Provide with turn down elbow for draining to bucket or hose. The valves shall be provided as for gate or ball valves. The valves shall have cast iron body, corrosion resistant steel floating, hardened steel removable lever seat, corrosion resistant. Air vent valves on water coils shall have not less than 15 mm threaded end connections. Valves shall be suitable for hot or cold water service PH 10. The valves shall be 20 mm pipe size for water mains and 15 mm pipe size, minimum, for all other applications. Air vent valves shall be provided at all high points in the water piping system, at all water coils, and as indicated.

3.12.7 Calibrated Balancing Valves

PN 10, 50 mm and smaller bronze, screwed; 65 mm and larger, cast iron flanged plug valves. All with indicator for angular position of valves, meter connections with positive check or shut-off valves and internal seals to prevent leakage around stem. For each valve provide a flow vs. differential pressure vs. angular position calibration chart.

Balancing valves shall be installed on all coils, pump, and branch lines off of main and as indicated on drawing or in specification for individual equipment. Provide a differential pressure meter compatible with balancing valves for calibration of valves to be turned over to the Contracting Officer’s Representative after construction is complete. Meter shall include differential pressure indicating gage, hoses, shut-off and vent valve, and carrying case. Gage shall read 0.15 to 33 meters of water, accuracy shall be within plus or minus 5 percent. Each valve shall have calibrated metal tag showing the liters per hour (or liters per second) flow for each differential pressure reading.

3.12.8 Pump Suction Diffuser

Casing shall include an angle type body of cast iron. Unit shall have internal straightening vanes, strainer with minimum 6 millimeter openings, and auxiliary disposable fine mesh strainer which shall be removed 30 days after start-up. Provide warning tag for operator indicating scheduled date for removal. Casing shall have connection sizes to match pump suction and pipe sizes, and be provided with adjustable support foot or support foot boss to relieve piping strains at pump suction. Blowdown port and plug shall be provided on unit casing. Provide a magnetic insert to remove metal debris from system.

3.12.9 Butterfly Valves

Tight shutoff valve, and valve ends shall be flangeless. The valve body material shall be cast iron with tapped lugs for independent bolting to upstream and downstream flange and shall be bubble tight for shutoff at 1000 kPa. Flangeless type valves shall have corrosion-resistant steel stems and discs or bronze discs with molded elastomer disc seals. Flow conditions shall be for the regulation from maximum flow to complete shut-off by way of throttling effect. Valves shall be used in closed and open systems. Valves smaller than 200 mm shall have throttling handles. Valves shall have a minimum of 7 locking positions and shall be suitable for water temperatures up to 82oC.

3.12.9.1 Butterfly Valves 50 mm and Smaller

Shall be one-piece and three-piece design with male or female threaded end connections, and shall be bubble-tight for shut-off at 1000 kPa. The stem and disc assembly shall be of corrosion-resistant steel. The disc seal shall be suitable for the liquid being used in the system in which the valve is to be installed. The valves shall be suitable for water temperatures up to 82oC and shall be capable of operating at the rated pressure of 1000 kPa. The valves shall be designed for throttling service use by valve lever and indicator adjustment.

3.13 MISCELLANEOUS COMPONENTS FOR PIPING SYSTEM

3.13.1 Strainers

3.13.1.1 Water Piping Strainers

PN 10 in sizes 15 mm to 200 mm, inclusive, Y-type. Each strainer shall be equipped with an easily removable cover and sediment basket. The basket shall be of stainless steel sheet with small perforations of sufficient number but not less than 50 per square centimeter for sediment baskets up to 50 mm in size.

3.13.2 Flexible Connectors

Provide straight flexible connectors as indicated and rated for temperatures, pressures, and types of fluids to be conveyed. Flexible connectors shall be designed for 2-1/2 times operating pressure at highest system operating temperature.

3.13.2.1 Metal Flexible Connectors

Provide flexible connectors fabricated of Grade E phosphor bronze, monel or stainless-steel corrugated tube covered with comparable bronze or stainless braid restraining and pressure cover. Stainless steel grades shall be 304, 316, or 321 as required for the application. Live lengths shall be not less than that recommended by the manufacturer for continuous vibration application.

3.13.2.2 Elastomeric Flexible Connectors

Provide elastomeric flexible connectors fabricated of multiple plies of tire cord fabric and elastomeric materials with integral re-informed elastomeric flanges with galvanized malleable iron back up rings. Provide steel restraint cables with fittings, nuts, steel washer, and acoustical washers where elongation would exceed manufacturer's limits at operating pressure. Elastomeric connectors shall have either tubular or spherical configuration as required or indicated. Spherical type straight connectors shall have two spheres.

3.14 PUMPS

3.14.1 Chilled Water, Hot Water, Pumps

Pumps shall be as specified below and equipped with mechanical seals. Pump capacity and efficiency for each selection shall be as indicated. Selected catalog data submitted for approval shall include pump speed and characteristic curve for performance of impeller selected for each pump. Curves shall indicate capacity vs. head, efficiency, and brake horsepower for full range, from shut-off to free delivery.

3.14.1.1 Base-Mounted Pumps

Enclosed impeller design, arranged to permit removing impeller without dismantling piping. Motors: IP22, 1500 rpm, drip proof. Provide casings designed for pressure shown, but not less than 860 kPa at suction. Provide dual motors sized to prevent overload at zero head with impeller furnished.

3.14.1.1.1 Shafts

Turned from heat treated carbon steel, key seat for the impeller, threaded for shaft nuts, finish turned over entire surface.

3.14.1.1.2 Shaft Sleeves

Equip portions of the shafts coming in contact with the water with removable bronze or stainless steel sleeves.

3.14.1.1.3 Impeller

Bronze with machine finish on the outside and smooth surfaces inside, balanced to prevent vibration. Impeller diameters shall not exceed 85% of maximum diameter for volute.

3.14.1.1.4 Casing Wearing Rings of Bronze

Easily replaced, installed to prevent rotation.

3.14.1.1.5 Seals

Equip pumps with mechanical seals suitable for use with design water temperatures.

Provide 1 spare shaft seal of each size used on job.

3.14.1.1.6 Bearings

Ball grease lubricated type of ample size to ensure cool running without the necessity of water cooling, effectively sealed against the entrance of water, dust or dirt and leakage of grease.

Couple motor to pump with flexible coupling.

Mount motor and pump on common rigid steel or cast iron base.

Align pump and motor in accordance with manufacturer's instructions. Check alignment after first 8 hours' operation.

3.14.1.2 Inline Pumps/Circulating Pumps

Shall be as specified above for base-mounted pumps, except specifically designed to be in-line mounted (vertical motor, horizontal pump head) with flanged connections, pressure taps, and mounting brackets.

3.15 EXPANSION TANKS

Provide bladder type tanks with acceptance and tank volumes indicated. Tanks shall be black welded steel, constructed for 860 kPa working pressure and shall be constructed and tested in…