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GUIDELINES

FOR

HVAC & CIVIL WORKS.

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INDEX

SR. NO.

DESCRIPTION PAGE

SECTION I PARTICULAR TECHNICAL GUIDELINES SECTION II TECHNICAL GUIDELINES 1.0 GENERAL DESCRIPTION 7-8 2.0 LIQUID CHILLING MACHINE WATER COOLED 8-21 3.0 DOUBLE SKIN AIR HANDLING UNITS 21 4.0 VENTILATION FANS 21-25 5.0 PUMPS 25-34 6.0 PIPING 34-40 7.0 PIPE CLEANING AND CHEMICAL WATER TREATMENT 41-44 8.0 SHEET METAL WORKS 44-50 9.0 INSULATION 51-55 10.0 PAINTING 56 11.0 ELECTRICAL WORKS 57-60 12.0 PREVENTIVE MAINTENANCE CONTRACT 60-61 13.0 MAKE OF EQUIPMENT AND APPROVED MANUFACTURES 61-63 14.0 PRECISION AIR CONDITIONING SYSTEM FOR DISASER

RECOVERY CENTRE 63-66

15.0 MISCELLANEOUS CIVIL WORK FOR PLACING CHILLERS AND COOLING TOWER FOR DATA CENTER

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SECTION I 1.0 PARTICULAR TECHNICAL GUIDELINES:

1.1 FOUNDATION: 1.1.1 All concrete foundations/structural steel frame work required by the agency can be

provided in the HVAC scope. The agency can furnish detailed particulars and drawings showing exact location and dimensions of required foundations in such time as to obtain structural approval. All required anchor bolts, nuts, washers, vibrator isolators, etc., can also be furnished by the agency. Necessary approval from base building structural consultant can be obtained by the agency.

1.2 EQUIPMENT SUPPORTS: 1.2.1 Provide supports for all apparatus as specifically detailed and as required by manufacturers

of specific equipment. 1.3 EQUIPMENT PROTECTION: 1.3.1 Keep all pipe openings closed by means of plugs or caps to prevent entrance of foreign

matter. Protect all piping duct work, equipment or apparatus. 1.3.2 Protect all bright finished shafts; bearing housings and similar items, units in services no

rust will be permitted. 1.3.3 Equipment and materials stored on the job site can be covered or otherwise suitably

protected at the direction of and to the satisfaction. Motor control centers, etc., can be completely covered against moisture, dust and foreign materials. In case of damaged coverings can be replaced until the equipment is connected and operated.

1.4 ADJUSTMENTS AND INSTRUCTIONS: 1.4.1 Make necessary adjustments for each system and piece of apparatus installed, using

factory trained and employed personnel for such systems as temperature controls and whenever practicable for other equipment and instruct the operator and his staff thoroughly in proper operation of the apparatus.

1.5 ACCESSIBILITY: 1.5.1 The installation of valves thermometers, clean out fitting and other indication equipment or

specialists requiring frequent reading, adjustments, inspection, repairs and removal or replacement, can be conveniently and accessibly located with reference to the finished building. Thermometers and gauges can be installed so as to be easily read from the floor level.

1.6 ACCESS PANELS: 1.6.1 Furnish access panels, where indicated and where required to provide access to valves

and other appurtenances. Panels can be of type required for the wall or ceiling construction. Doors can be of appropriate size and design.

1.7 INSERTS & SLEEVES: 1.7.1 Layout work in advance of placing of concrete slabs or construction of walls, furnish and set

inserts and sleeves necessary to complete the work.

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1.8. PIPE SLEEVES:

1. Wall Sleeves:

a. Interior wall sleeves can be 22 gauge galvanized steel, flush with wall on both sides. Sleeves can be large enough in diameter to provide 6mm clearance around pipe or insulation. All sleeves in Fire wall can be sealed using 3 M fire proof sealant.

b. Exterior wall sleeves can be PVC, flush with wall on both sides. Sleeves can be

large enough to allow for caulking from outside using 3M weather proof sealant.

2. Floor Sleeves:

a. Interior floor sleeves for general areas can be 22 gauges galvanized steel extending 25mm above finished floor. All pipes passing through sleeves can be caulked with 3 M Sealant. Insulated pipes can have insulation butted to floor sleeve and sealed with 3 M insulating cement on both sides. Exception: chilled water or refrigerant suction piping insulation can be run continuous through the sleeve and caulked.

b. Interior floor sleeves for kitchen areas can be galvanized steel pipe extending

25mm above finished floor. Caulked can be the same for general areas. 1.8.1 DUCT SLEEVES;

1. Wall Sleeves: Same as interior wall pipe sleeves except minimum 18 gauges and properly blocked to

prevent collapse during construction. 1.9 CLEANING: 1.9.1 Mechanical equipment, piping and duct work can be free of rust and other foreign materials. 1.9.2 Air system can be blown clear. 1.9.3 Electrical contacts and motor starters can be vacuumed clean of dust and debris. 1.10 OPERATION: 1.10.1 Entire mechanical and electrical apparatus can operate at full capacity without

objectionable noise or vibration. 1.11 TRAINING FOR PERSONNEL: 1.11.1 The agency can associate trainings for required personnel during the erection of equipment. 1.12 ALTERNATE PROPOSALS: 1.12.1 The system schematic can be adhered to for developing the detailed system design. 1.13 DESIGN CONFIRMATION: 1.13.1 Agency to confirm that the scheme on which this enquiry for offer is prepared has been

verified by us and that it meets with the requirements of all Government, semi-Government, Municipal Local and other Authorities, whose permission would become necessary for the completion of the project.

1.14 SYSTEM DESIGN and EQUIPMENT/MATERIAL GUIDELINES:

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The agency can detail design the system based on schematic which is part of this document and guarantee the required environmental conditions as specified. Agency should seek all clarifications before submission of technical & commercial offer.

Submission of offers would imply that agency has clearly understood the requirements and obtained clarifications, if any, in regard to all the queries.

Equipment-set/system and materials in the scope of manufacture, supply and installation can comply with the appropriate/relevant codes of practice and standard guidelines. References to standards, codes, guidelines, recommendations can mean the latest edition of such publications adopted and published as on the date of invitation to submit the offers. Any deviation whatsoever from the standards can be only after express confirmation by us in writing before release of purchase order.

Agency can provide, whenever required, samples of material/s. The samples can be submitted for approval well before the commencement of a particular job.

Agency can provide all items whether specifically mentioned or not but which are usual or required to make the equipment-set/system operational. The equipment-set/system and associated materials can be in accordance with the intent or purpose of these guidelines and can be considered to be in the scope of work of the contract to be furnished without extra charge, as if fully described and called for in these guidelines.

1.15 BILL OF MATERIAL:

The agency should submit bill of material in detail with quantities. The agency should indicate the manufacturer name/ brand names and model nos. of various items being proposed meeting the specs.

1.16 DOCUMENTATION: Before proceeding with the work, agency can submit the general layout and assembly drawings and such additional assembly and subassembly detail drawings as may be necessary to demonstrate fully that all parts of the equipment-set/system to be furnished will conform to guidelines. Agency can also submit catalogues and selections of the individual items in the equipment-set/system proposed. Further, the equipment-set/system and material delivered to the site can conform strictly to the approved make and selection as given in purchase order.

No modification whatsoever should be made in drawings once it has been approved, without prior consent in writing. Agency can also arrange to furnish complete set of drawings for assembly, erection, maintenance, repair and operation of the equipment-set/system. All parts in the drawings can be suitably numbered for identification and ordering as spares. One set of relevant drawing, general layout/arrangement drawing of A0 size to be laminated and kept at site for reference.

Approval of the drawings cannot relieve agency of obligation to meet all requirements of the contract and the correctness of the drawings. Agency can be wholly responsible for all alterations in the work due to discrepancies or omissions in the drawings (or other particulars) supplied by agency whether such drawings have been approved or not. No amount can be payable towards such alterations. After execution of the project, agency can furnish a set of A0 size laminated original of "as built" drawings along with soft copies.

Agency can furnish and install in the plant room a neatly typed set of operating instructions securely framed and glazed.

1.17 TESTING:

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The equipment-set/system can be tested as per offer guidelines. Routine and type tests for the various items of equipment-set/system can be performed at the work site and agency can furnish test certificates for the same. Agency can permit purchasers representative to be present during any or all the tests. After agency notifying that the installation has been completed, agency can make under direction and in purchasers presence any such tests and inspections that are considered necessary to determine whether or not full intent of the guidelines has been fulfilled.

In case the work does not meet the full intent of the guidelines and further tests are considered necessary, agency can carry out the same at their own cost.

All calibrated instruments required for tests can be of the required accuracy and can be furnished by agency at no extra cost. Generally ARI/Euro vent Code can be followed.

Agency can carry out site performance tests takes over the Air conditioning systems. TENDERER to submit test certificates along with software selection sketch of equipment proposed.

Test procedure can be as per the Method Statement for On-Site Commissioning & Testing.

1.18 HANDING OVER DOCUMENTS (HOD):

After successful testing and commissioning of the equipment along with accessories in total should submit Handing over Documents neatly bound to corporate standards along with copies in CD.

The following are to be included in the HOD: 1. Brief Design Concept 2. List of supplier 3. As built Drawings 4. Approvals/Documents 5. Escalation Matrix 6. Test Readings/ Reports. (Full testing and commissioning record) 7. Installation and commissioning Reports. 8. Warranties/ Guarantees. 9. Snag list status. 10. Operating manuals. 11. Tools/ Tackles/ Spares. 12. Emergency operation derails. 13. Log book/ Service record. 14. Emergency contact of list with Phone/ Mobile/ Pager/ Fax/ E-mail/ Etc.

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SECTION II

TECHNICAL GUIDELINES 1.0 GENERAL DESCRIPTION 1.1 SCOPE:

These guidelines together with system schematic cover design, supply, erection, testing and commissioning of Air Conditioning system for the project.

1.2 Building: 1.2.1 For details of building construction, refer Architectural and Structural drawings. 1.3 Schedule of Requirements: 1.3.1 Air conditioning, requirements as per the schematic drawings. 1.4 Design Data (Leading practices)

The summer, Monsoon and winter design and indoor condition shall be as per Latest ASHRAE 2011 guidelines

For DC Precision AC areas (supply air temp. 22 C 2 C) and Relative Humidity (RH) shall be as per Latest 2011 Thermal guidelines of ASHRAE.

For UPS, 30C 2C For Battery room 25C 2C For BMS 26C 2C

Communication Room 24C 2C

Height As per Arch drg Lighting 16 W/ Sq.mtr (1.5 W/Sq.ft) Ventilation Air 10 cfm/person Exposed Glass Refer base building data

1.5 Performance Guarantee: 1.5.1 The agency can guarantee the HVAC system to maintain conditions as per guidelines and

drawings. 1.5.2 The agency can also guarantee that the performance of the various equipments individually

cannot be less than the specified ratings when working under the operating conditions given for the respective items in the finally accepted Schedule of Equipment.

1.5.3 The agency can guarantee the power input to the Air conditioning Units at the specified

condition. 1.5.4 The agency can achieve the desired ambient noise level in the occupied space. 1.6 System schematic Drawing: 1.6.1 System schematic drawings have been enclosed for developing detailed design.

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1.7 Technical Data: 1.7.1 Technical data of equipment can be furnished as required under section Schedule of

Technical Data. 1.8 Test Data: 1.8.1 All equipment can be tested as required by the various articles of the guidelines and Test

Data, as required under Article Test Readings can be furnished. 1.8.2 Test readings can be furnished for peak summer, winter and monsoon outside condition. 1.9 Work At Site: 1.9.1 The agency can inspect the site and ascertain for himself the nature, character and extent

of work to be executed and can include all items and services necessary whether specifically mentioned or not in the guidelines. Drawings or schedule of equipment to make a complete working plant to meet with the intent and purpose of these guidelines.

1.10 Electrical Equipment: 1.10.1 All electrical equipment can be suitable for 230V 10%, 1 phase, 50 cycles/415V 10%, 3

phase, 50 cycles, 4 wire AC supply unless otherwise stated.

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2.0 LIQUID CHILLING MACHINE WATER COOLED 2.1 SCOPE: 2.1.1 The scope of this consists of but is not necessarily limited to the following

a) Manufacture and supply of screw/scroll liquid chillers with associated motors, soft starters and accessories.

b) All associated items herein to be supplied delivered and installed. c) Assembly of chillers components including connection of coolers, condensers,

motors, compressors, etc. into complete refrigeration machines. d) Provide manufacturers factory representatives services including co-ordination and

start-up and testing supervision. e) Testing (factory & field), start-up supervision, training and providing necessary

documentation and tools for operation. f) Carry out performance test run.

2.2 QUALITY ASSURANCE: 2.2.1 Each chiller cannot be of capacity higher than 150 TR. The performance can be certified in

accordance with ARI-550-98 / Euro vent standards.

Pressure vessels can be designed, constructed, tested, stamped and complete with devices in accordance with ANSI/ASHRAE 15 - 1989 Safety Code and ASME Code.

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2.2.2 Chillers can be the product of a manufacturer normally supplying this type of equipment and who can show evidence having completed at least five installations of approximately the same capacity, that have been in successful operation for the last five years.

2.2.3 The chiller can be factory performance tested under full load conditions in an ARI certified

test facility or equivalent Euro vent certified test facility. The manufacturer can supply a certified test report to confirm the performance as specified.

The chiller can be designed/manufactured and tested in accordance with the Applicable portions of the latest revisions of the recognized Standards and Codes.

ARI / Euro vent Standards

2.3 CAPACITY: 2.3.1 Actual refrigeration capacity of each chilling machine cannot exceed 150 TR. Maximum Power Consumed: Not greater than 0.67 in kW/TR 2.4 GENERAL: 2.4.1 The chiller can be completely factory assembled including all interconnecting refrigerant

piping and internal wiring of controls, mounted on a steel base frame which accommodates the water cooled condenser, compressors and coolers. Operating test can include operation with water flowing through the cooler and condenser. The unit structure can be heavy gauged galvanized steel and can be painted with baked on enamel and shipped with a full operating charge of refrigerant gas. Each unit can contain 2 or more refrigerant circuits, each with a single compressor of appropriate capacity. The unit can be designed and constructed in accordance with the applicable sections of the codes given above.

2.5 COMPRESSORS:

2.5.1 The compressor can be either rotary screw type or scroll type. Compressor can be semi-hermetic, field re-buildable and utilize horizontal rotors. Vertical rotor compressors are not acceptable. The chiller should be able to unload to 10% of design tonnage with constant entering condenser water temperature. The compressors can be driven by electric motor via. A speed increase gear or direct drive. Manufacturers with speed increasing transmission can annually inspect the gears and the bearings. The compressor parts and profiles should be designed specifically for chilled water applications. The compressor can be mounted on isolators. The compressor can incorporate a complete anti-friction bearing design to reduce power and increase reliability; four separate cylindrical roller bearings to handle radial loads; and two 4-point angular contact ball bearings to handle axial loads. The compressor can have an internal oil reservoir to assure a constant supply of oil to the bearings at all times. The compressor can have internal muffler. A spring actuated positive seating check valve can be incorporated in the compressor housing to prevent rotor backspin during shutdown. Each compressor can be equipped with discharge shut off valve. The compressor housing can be of cast iron, precision machined towards minimal clearance for rotors. The rotors can be of high steel alloy. The compressors can also contain a 500 W (115-1-50) temperature actuated immersion heater to prevent refrigerant condensation during shut down. Power wiring to control center can be contained and protected within a liquid tight conduit.

All chiller plant should come with multiple compressors. (Min 2 compressors per chiller.) 2.5.2 Capacity Control:

The control system can modulate capacity from 100% to 20% of chiller full load with constant entering condenser water temperature by use of a slide valve in the rotor section

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of the compressor. The slide valve is driven by a piston and cylinder actuated by oil pressure controlled external solenoid valve via. The microprocessor control center. The capacity control may also be provided by use of pilot operated solenoid valve. The compressor can start in unloaded condition. The unit can be capable of operating with lower temperature of cooling tower water during part load operation in accordance with ARI Std. 550-98/Euro vent Std.

2.5.3 Compressor Motor: The motor can be hermetic and liquid refrigerant cooled and operated at approx. 2900 rpm

(50 Hz). The motor stator can have U. L. Class H Insulation. The terminal boxes can be rain tight. The hermetic motor can be high torque, soft start and equipped with six internal heat sensing thermistors. The motor can have 3 RTDs in the motor windings, one per phase to protect high motor temperature at start-up.

2.5.4 Oil Separator and Lubrication:

An external oil separator of horizontal design located at the discharge end of the compressor with no moving parts can be provided to minimise the carryover before refrigerant enters the heat exchangers. The oil separator can consist of a perforated cylinder that surrounds a helical passage. Oil separation can be achieved by means of centrifugal force through the helical passage way which forces the oil to collect on the exterior walls of cylinder. Oil separator can be designed for a maximum working pressure of 450 psig and can be UL and CSL listed. The oil separator can include a sight glass.

The compressor can also have oil reservoirs to lubricate the bearings, during start-up, coast-down and in case of power failure. This could also be achieved by pre-lube or post-lube oil pump operation. During operation, oil can be delivered by positive system pressure differential or a full time operation of an oil pump.

An immersion oil heater [500 Watt (230-1-50)] can be provided, temperature actuated to effectively remove refrigerant from the oil. An external replaceable cartridge, 3 micron oil filter can be provided along with manual isolation stop valves for ease of servicing. An oil educator can be provided to automatically remove the oil which may have migrated to the evaporator and return it to the compressor.

Oil cooling can be provided by liquid injection to maintain proper oil and discharge temperatures for all conditions. A temperature blending solenoid valve controlled via the Control Center can provide consistent oil temperature at all times to assure proper oil viscosity independent of system conditions.

2.6 ECONOMIZER: 2.6.1 An economizer can be included in each circuit to enhance the overall system performance.

The refrigerant to refrigerant, plate type economizer can be constructed of acid resistant stainless steel. The compact and pressure resistant heat exchanger package can be formed, brazed and the entire material can be utilized for heat transfer. The heat exchangers can be OSA listed and designed for 450 psig. The temperature limits can be 320 F minimum to 365 F maximum.

2.7 COOLER AND CONDENSER: 2.7.1 The cooler and condenser can be of the shell and tube type designed for 300 psig

working pressure on refrigerant side and be tested at 450 psig. Flooded type design for cooler can also be acceptable. Shell can be fabricated from rolled carbon steel plate with fusion welded seams, have carbon steel tube sheets, drilled and reamed to accommodate the tubes, and intermediate tube supports spaced no more than four feet apart. The shell

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can be built in accordance with ANSI/ASHRAE-15-1992 Safety code for Mechanical Refrigeration. The refrigerant side can be designed tested and stamped in accordance with the ASME Boiler and Pressure Vessel Code Section VIII, Div I. The tubes of the cooler and the condenser should be individually replaceable.

Water boxes can be flanged and gasketed for easy removal and access to the tubes. The water boxes can have flanged water connections/ grooved connections for easy field chilled water and condenser water connections. Cooler and Condenser tubes can be internally enhanced seamless copper and externally finned to achieve maximum efficiency. The nominal tube wall thickness can be 0.028 for both cooler and condenser tubes. Cooler tubes can be 1 dia. Condenser tubes 3/4 dia. Tubes can be mechanically expanded with tube sheets. Liquid level sight glasses can be located on the side of the shell in determining proper refrigerant charge. The condenser can have a baffle arrangement to prevent direct impingement of compressor discharge gas upon the tubes. Also a refrigerant sub- cooler can be provided for improved cycle efficiency.

The waterside should be hydrostatically tested at 1 1/2 times the design working pressure but not less than 225 psig. Vent and drain arrangements/connections can be provided on each water box.

Cooler and condensers can be manufactured as per European directive 97/93/EC as An option to ANSI Standard. Cooler and condensers can be mechanically pinable shell and tube type with removable head.

All water connection can have Victaulic couplings. Chiller can be insulated with 19mm closed cell polyvinyl chloride foam with a maximum K factor of 0.28. Chiller insulation can have aluminium cladding. Chiller shell can have drain and vent.

2.8 REFRIGERANT CIRCUIT: 2.8.1 The refrigerant circuit can be constructed of copper tubing with brazed joints. Refrigerant

circuit can include oil separators, high and low side pressure relief devices, discharge and liquid line shut off valves. The refrigerant flow to the cooler can be metered by a single fixed orifice with no moving parts. The liquid line can include a shut off valve with a charging port, sight glass with moisture indicator, thermal expansion valves, solenoid valve and filter drier. Additional valves can be provided to facilitate removal of refrigerant charge. Factory insulation can be 19mm closed cell polyvinyl chloride foam with a maximum K factor of 0.28 and cover all low temperature surfaces to include the evaporator and water flanges, suction elbow, economizer, motor housing and motor cooling lines. Insulation can have aluminium cladding.

2.8.2 The refrigerant should be for zero ODP. 2.9 POWER PANELS: 2.9.1 The machine should include a unit starter/power panel. The power panel can contain the

following:

Compressor power terminal, compressor motor starting contactors, current transformer sensing for each compressor phase for protection against under current, over current, unbalanced current, single phasing compressor stall, phase reversal protection and voltage spikes and control power supply terminal strip for 115-1-50.

2.9.2 Power will be supplied at a single point. Necessary enclosures, terminal block,

interconnecting wiring from power panel to compressors to be included by manufacturers.

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2.9.3 Manufacturers to also provide a factory mounted disconnect switch with internal fusing and an external lockable handle (in compliance with N.E.C. Article 440-14) to isolate the power, voltage for servicing.

2.9.4 Each refrigerant system can contain a factory mounted circuit breaker with external handle

(in compliance with N.E.C. Article 440-14) to isolate the system for servicing fusing to be included by the manufacturer.

2.9.5 Starters:

Motor Starters: The starter can be factory installed and wired on the chillers. The starter enclosure can be IP-44 with a hinged access door with lock and key. The following specific requirements for motor starters must comply with these guidelines.

a) Starter can be of the Wye-delta closed transition type/soft starter. The Wye contactor

capable of handling 33% of the delta locked rotor current and equipped with resistors properly sized to provide a smooth transition. The resistors can be protected with a transition resistor protector to prevent damage to the resistors. This device must trip in a maximum of 2 seconds, locking out the starter, and can be of the manual reset type. The starter can be equipped with a transition timer adjustable from 0 to 30 seconds. Transfer time from Wye to delta cannot exceed 90 milliseconds.

b) Starter can be free-standing NEMA-1 enclosure designed for top and bottom cable entry and can have front access with adequate working clearance for line and load wiring below 650 amperes and, where possible, sized to be compact. Adequate separation of high and low voltage sections and proper mechanical and electrical interlocks will be provided to meet all applicable safety and operating codes.

c) Starter can have a permanent nameplate mounted inside the cabinet showing manufacturers identifying numbers, order number, voltage, rated load amps and locked rotor amps, and overload trip settings. Starter can have affixed to the inside of the door a complete, as built, wiring schematic showing all accessory items provide.

d) Starters can be equipped with solder less line and load side connectors to handle wire

sizes indicated by standard electrical industry practice and the National Electrical Code. Lug sizes and types are for copper conductors only. Starter line (L1, L2, L3) and load (T1, T2, T3, T4, T5, T6) terminals must be identified by suitable markers. The starter can also be equipped with a clearly marked control terminal strip. Wire markers are required at each end of each wire lead; both control and power, and can correlate with schematic and/or wiring connection diagrams.

e) The starter can be equipped with redundant motor control relays with coils in parallel and contacts. The MCR relays interlock the starter with the screw control centre and directly operate the motor contactors (start and run). They can constitute the only means of energizing the motor contactors and no other devices - manual and automatic, factory installed or remote can be wired so as to energize the starter. The relays can have 115 VAC coils with a maximum combined inrush of 500 VA and a maximum combined sealed rating of 50 VA.

f) The main contactor that completes the starting sequence can contain two sets of

auxiliary contacts, one normally open and one normally closed with ratings of not less than 125 VA at 115 VAC. An additional set of normally open contacts rated at 125 VA pilor duty at 115 VAC can be provided on both MCR relays.

g) Overload relays can be microprocessor motor controller. There can be an overload in

each phase set at 107% of the rated load amps of the connected motor. Overloads can be manual reset and can de-energize the main contactor when over current occurs. Overload

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can be adjustable and selected for mid-range. Overload can be adjusted for locked rotor trip time of 8 seconds at full voltage and must trip in 60 seconds or less at reduced voltage.

h) Starter can be equipped with a line to 110 volt/50 Hertz control transformer, fused in

both primary and secondary, to supply power to the screw unit control box and oil pump motor. The transformer can be rated at 2 KVA minimum in addition to any starter requirements and can additionally have an inrush rating of 12.5 KVA minimum at 80% power factor and 95% secondary voltage. The secondary can be furnished with 10% voltage taps for all international orders. The secondary fusing can be a dual element rated 20 amp, 250V. CP-2 terminal can be grounded at the starter.

I) Starter can include an advance motor protection system incorporating 3 phase overloads

and current transformers. This electronic protection system can monitor and protect against following conditions:

- Three current transformers and 3-phase digital ammeter (1% accuracy). - Motor current as a percent of full load amps for each phase. - Phase failure/reversal protection. - Ground fault protection. - Stall protection. - High/low line voltage protection.

j) Space can be left available for possible future relays and contacts to be specified later

for wiring to the supervisory data center. k) Permanent wiring diagram to be affixed to the inside of the panel load. Drawings to be of

plasticised finish. l) Provide power transformer in each chiller starter to enable remote KW readings by

building automation system. 2.10 CONTROLS: 2.10.1 The unit can be equipped with a complete microprocessor control system. This system can

consist of temperature and pressure sensors, input/output boards, power supply board, main processor board with display and keypad. Boards can be individually replaceable for each of service. All devices and sensors can be factory mounted and wired.

2.10.2 The display can be a minimum of 160-character liquid crystal display (LCD) providing all

messages in plain English. Two or three digit displays are not acceptable. The display can be light emitting diode (LED) backlit for easy viewing in all light conditions.

2.10.3 The interface device can be equipped with 18 individual touch-sensitive membrane key

switches. These switches can be divided into four separate sections and be multi-level password protected from changes by unauthorized personnel.

2.10.4 End user interaction with the display section of the interface can provide the following

information on the 160-character LCD. In addition, all of the operation data can be accessible by pressing one of the Quick Access keys.

1. Entering chilled water temperature 2. Leaving chilled water temperature 3. Entering condenser water temperature 4. Leaving condenser water temperature 5. Evaporator temperature 6. Suction temperature 7. Suction superheat temperature 8. Discharge temperature

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9. Discharge superheat temperature 10. outside air temperature 11. Motor amps (1 amp resolution) & Motor KW 12. Oil feed temperature 13. Oil sump temperature 14. Oil pressure 15. Condensing temperature 16. Liquid line temperature 17. Liquid sub-cooling 18. Condenser approach 19. Evaporator approach 20. Evaporator pressure 21. Condensing pressure 22. Lift pressure 23. Motor amps at % of RLA 24. Oil differential pressure 25. Total hours of operation 26. Number of starts 27. Hours since last start 28. Time of last start 29. Time of last stop 30. High discharge temperature 31. Low evaporator temperature 32. Soft load 33. Maximum pull down 34. Remote amp limit 35. Manual amp limit 36. Network amp limit 37. Manual load 38. Maximum amp load 39. Minimum amp load 40. Leaving evaporator set point 41. Reset leaving set point 42. Remote reset signal 43. Fault history (last 8) with time/date stamp 44. Critical sensor values at time of faults 45. Unit status

- Start-up sequence status - Shutdown status - Operational status

For Motor KW an external KW meter to be provided.

2.10.5 The microprocessor can sense any abnormal condition and take the necessary anticipatory action to either unload or shut down the compressor. As a minimum the following safeties can be incorporated in the control system and can be indicated on the display:

1. Low discharge set point 2. High discharge set point 3. Low evaporator pressure - no load 4. Low evaporator pressure - unload 5. High discharge T - load 6. Condenser pressure low 7. Evaporator pressure low - freeze 8. Evaporator pump failure 9. Condenser pump failure 10. Low evaporator pressure - SD 11. Low oil delta pressure

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12. Low oil feed temperature 13. High oil feed temperature 14. Low motor current 15. Failed stop - high amps 16. High discharge line temperature 17. High condenser pressure 18. Mechanical high pressure switch 19. High motor temperature 20. No starter transition 21. No evaporator water flow 22. No condenser water flow 23. Starter fault 24. Sensor failure - Liquid line temperature - Discharge temperature - Suction temperature - Entering evaporator temperature - Entering condenser temperature - Leaving evaporator temperature - Leaving condenser temperature - Evaporator pressure - Condenser pressure - Oil feed temperature - Oil sump temperature - Oil pressure

2.10.6 Leaving chilled water temperature can be controlled to within 0.2 F of set point. The

microprocessor can employ PI (proportional plus integral) control algorithms to insure precise control without hunting, droop or overshooting of the set point. End user can input leaving chiller water temperature set point by interaction with the keypad and display.

2.10.7 The end user can be capable of changing set points by entering the correct

password, touching the desired function key, pressing the increase/decrease key to change set point, then ENTER or CANCEL.

2.10.8 The microprocessor can limit the amp draw of the compressor to the rated load amps (RLA)

or at a user selected value from 30 to 100% of RLA (1% increments) as protection from exceeding maximum allowable amp draw. The microprocessor can anticipate any trends above the set point and automatically unload the compressor until the amp draw is below the set point. The display can indicate any override amperage condition if the above occurs.

2.10.9 The microprocessor can be capable of resetting the chilled water temperature either based

on return chilled water temperature or a remote 4-20mA DC signal from an energy management system. The amount of reset can be programmable by inputting the amount of reset based on the signal (if remote) or the desired entering chilled water temperature (if local). The microprocessor can also be capable of being demand limited locally from 30% to 100% RLA (1% increments) or from a remote 4-20mA DC signal from an energy management system.

2.10.10 the microprocessor can incorporate a soft load function to prevent the compressor from

operating at full load during the chilled water temperature pull down period. This function can be accessed by the keypad and can incorporate the following adjustable set points: (a) percent load at which ramp function begins, and (b) length of time in minutes that the compressor will be allowed to reach maximum amp limit. Microprocessor can display current soft load limit value in % of rated load amps during the ramp-up function.

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2.10.11 the microprocessor can be equipped with a time clock to allow the end user to program a yearly schedule during the week, weekend, and holidays. This Clock Schedule can allow for two discrete, 7-day repeatable schedules to be programmed for one automatic START/STOP per day. A 1-year programmable Holiday Schedule can override the weekly Clock Schedule and restrict the chiller from operating on the holiday selected. The operator can have the ability to input an override time period (0 to 50 hours) that will allow chiller operation during scheduled OFF periods due to Clock or Holiday scheduling.

2.10.12 The control system can have auto-restart after power failure and not require battery

back-up or auxiliary power supply for maintaining program memory. The microprocessor can have a battery backed-up time clock to insure correct time of day input after power failure. The time clock function can allow for time changes.

2.10.13 for ease of service and enhanced system reliability, the microprocessor can be capable of

storing the current and previous eight safety shutdowns with a time/date stamp and recording a sensor data at the time of alarm.

2.10.14 the microprocessor can be capable of starting the unit form a local or remote station. The

station selection can be programmable by simple end user input via the keypad and display. Multiple machine installation applications can be capable of non-simultaneous starting to prevent overloads on the distribution systems.

2.10.15 the microprocessor can incorporate two short cycle time functions: (1) Start-to-Start, and (2)

Stop-to-Start function. These can be specially programmed to provide the least amount of time off line while providing the maximum in compressor motor protection. The Start-to-Start function can be set at 40 minutes but can be capable of being programmed from 20 to 60 minutes. The Stop-to-Start function can be set at 5 minutes but can be capable of being programmed from 3 to 20 minutes. Both conditions must be met prior to machine start. The auto-restart after power failure function can provide a restart within 2 minutes, assuming both short cycle time functions have been satisfied.

2.10.16 the microprocessor can incorporate the following automatic START and STOP set points

and each can be individually programmable via the keypad and display: a) Start-up Differential Temperature: Adjustable temperature above chilled water set point

that will activate the normal start-up sequence. The Start-up Differential value can be adjustable from 1.0 to 10.0 F.

b) Shutdown Differential Temperature: Adjustable temperature below chilled water set

point that will cycle the unit OFF after satisfying chiller system load. The Shutdown Differential value can be adjustable from 1.0 to 3.0 F.

2.10.17 For initial unit start-ups (Local request, Remote Start/Stop, or Automatic Time Schedule

Start-up), there can be a Load Delay Timer (adjustable be end user) that will postpone the initial temperature measurement of the leaving evaporator water for an adjustable time period in order to sample the true chilled water loop temperature and eliminate unnecessary nuisance start-ups.

2.10.18 Unit microprocessor can be capable of controlling the chilled water and condenser water

pumps through the use of factory supplied optically isolated output contacts. 2.10.19 the microprocessor can be capable of starting and stopping cooling tower fans through the

use of four optically isolated digital output contacts. The end user can be capable of start and stop temperature differential set points to provide the optimum energy savings of the compressor motor and tower fan motors.

2.10.20 the chiller control panel can provide a condenser/chiller water pump output relay that closes

when the chiller is given a signal to start.

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2.10.21 the microprocessor can be non-volatile requiring no additional battery backup while

maintaining all data even during an extended shutdown or power failure. 2.10.22 as a standard feature, the microprocessor can be capable of communicating to other units

or a personal computer with the use of a twisted pair wire communication interface of RS-232 (100 feet) or RS-422/485 (5000 feet). Communication interface can be RS-232 or RS-422/485.

2.10.23 the microprocessor can have an auto-logging feature that will automatically log chiller

functions at time of daily peak load or at a preset time and store up to six weeks of accumulated data.

2.10.24 the unit can have Service Test mode for troubleshooting hardware. 2.10.25 the unit can be factory configured in either English or SI units. 2.10.26 the unit can include keypad programmable alarm contacts. The contacts may be set up as

normally open, normally closed, or as an optional pulse output for pre-alarm conditions. 2.10.27 The unit can include analog inputs for chilled water reset, demand limiting, heat recovery

sensors, evaporator flow gpm, and condenser flow gpm. 2.10.28 the microprocessor can possess pre-alarm logic to high and low pressure controls logic to

take corrective action to avoid an alarm trip.

2.10.29 the unit can display pre-alarm warnings for low and high superheat, low oil temperature,

and high oil temperature. 2.10.30 the microprocessor can display complete warning and alarm diagnostics in plain English.

All warnings, problems and faults can be time/date stamped. In addition, operating conditions prior to shutdown can be retained in memory.

2.10.31 the microprocessor can incorporate oil cooler valve control. 2.10.32 the unit can be capable of pre-emptive control of low evaporator pressure Conditions - inhibit loading or unload. 2.10.33 the unit can possess multilevel password protection capabilities to prevent unauthorized

access to set points and to the Service Test mode. 2.10.34 the pull down rate can be adjustable (0.1/min. to 5.0min.) by using only the keypad. 2.10.35 as a standard feature, the lead-lag and load balance functions for dual and two-compressor

units can be contained within the unit controller code. Wiring can consist of a single shielded twisted pair cable connecting each unit controller.

a) The unit controller can have the capability to automatically dedicate the machine with the

fewest operating hours as Lead. The operator can also have the ability to override the Auto-Lead feature and manually dedicate either machine as Lead.

b) Lag unit operation can only occur when sufficient system load exists beyond the

capability of the Lead unit. Lag unit operating can be assured by first loading the Lead unit to its full capacity (user programmable based on % RLA) for a specific time period (user programmable) before starting the Lag unit. The stopping of the Lag unit can be based upon both units operating a minimum of two unit condition where one unit is capable of handling system capacity (user programmable based on % RLA) for a specific time period before stopping the Lag unit (unit with the highest number of elapsed hours).

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c) Machine sequencing with a return water thermostat cannot be allowed due to the inability

to change the thermostat set point. d) The unit controllers can automatically start the Lag unit or maintain operation of running

machine should either unit stop during normal operating due to a safety shutdown. e) During two-compressor operation, the Load Balance feature can equally divide the

cooling capacity and power consumption between the two units. This can be done by maintaining equal % RLA on each unit.

f) The unit compressor can have the capability to reset the leaving chilled water demand

limit of both units. 2.10.36 the unit can be provided with an Open Protocol Communications Module providiseamless

integration and comprehensive monitoring, control and data exchange with other building automation systems.

2.11 WATER CONNECTIONS: 2.11.1 Provide Victaulic water connection with water connection kit for both chiller and condensers. 2.12 FLOW SWITCH: 2.12.1 Provide vapour proof SPDT, NEMA 4X switch (150 psig DWP), -20 F to 250 F with 1

NPT connection for upright mounting in horizontal pipe. This flow switch for condenser & evaporator or its equivalent must be furnished with each unit.

2.13 VIBRATION ISOLATORS: 2.13.1 Provide vibration isolators level adjusting, spring type, 1 deflection for mounting under unit

base rails. Agency must guarantee vibration isolation and if required provide prong type isolators.

2.14 SEQUENCE CONTROL KIT: 2.14.1 For 2, 3 or 4 units with chilled water circuits connected in series or parallel, consists

of a return water thermostat, lead lag selection switches for sequence starting and time delay relay with NEMA-1 enclosures, 115-1-50 service.

2.15 INSTALLATION: 2.15.1 The chilling machine can be installed over a cement concrete platform and can be

adequately isolated as per manufacturers recommendations against transmission of vibrations to the building structure.

2.16 PAINTING: 2.16.1 Water chilling machine can be finished with durable enamel paint. Shop coats of paint that

have become marred during shipment or erection can be cleaned off with mineral spirits, wire brushed and spot primed over the affected areas then coated with enamel paint to match the finish over the adjoining shop painted surface.

2.17 PERFORMANCE TESTING & SUBMITTALS: 2.17.1 Submittals:

a) The manufacturers can submit drawings indicating components, assembly, dimensions, weights and loading required clearances and location and size of field connections.

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b) The manufacturer can submit product data indicating rated capacities, weights, specialties and accessories, electrical requirements and wiring diagram.

c) The manufacturer can also submit their installation instructions. d) The manufacturer can also submit reading of compressor speed, suction gas

temperature and pressure, condensing gas temperature and pressure and water velocity through evaporator tubes and condenser tubes.

2.17.2 Testing:

a) The manufacturer can supply a certified test report to confirm performance as specified. Proper ARI / Euro vent certification documents for the test loop can be made available upon request from the manufacturer for inspection. The performance test can be conducted in accordance with ARI standard 550-98 procedures and tolerances. Following shall be the criterion for type test at factory :-

b) The performance test can be run with clean tubes in accordance with ARI 550-98 to

include the following: 1. A downward temperature adjustment can be made to the design leaving evaporator

water temperature to adjust from the design fouling to the clean tube condition. 2. An upward temperature adjustment can be made to the design entering condenser

water temperature to adjust from the design fouling to the clean tube condition. c) The factory test instrumentation can be as per ARI Standard 550, and the calibration of

all instrumentation can be traceable to the National Institute of Standards and Technology (formerly NBS).

d) A certified test report of all data can be submitted to the owner prior to shipment of

chillers. The factory certified test report can be signed by an office of the manufacturers company. Pre-printed certification will not be acceptable; certification can be in the original.

e) The equipment will be accepted if the test procedures and results are in conformance with ARI Standard 550-98. If the equipment fails to perform within allowable tolerances, the manufacturer will be allowed to make necessary revisions to his equipment and retest as required.

f) Equivalent Euro vent test is acceptable. 2.18 CHILLER SOUND PERFORMANCES: 2.18.1 The chillers can have a factory installed sound attenuator that will lower the

manufacturers published A weighted sound data at least 3 dBA (operating at maximum capacity at ARI conditions). Provide compressor acoustic enclosure.

2.19 Remote Shut down Control Switch: Furnished and turnover to the electrical agency two Push Button operated remote Shut Down Switches, break glass type, red painted, to shut down all electric power to the chillers

2.20 Intelligent free-cooling

The proposed units should equipped with free-cooling options. The system should operate on chilled water mode & also should be capable of producing chilled water using external air if it permits. When the external air temperature is low enough, the microprocessor control system activates the free cooling mode: water is circulated by the free-cooling pump inside special heat exchange coils and cooled by external air forced in by the fans, which, together with the pump, are the only components which absorb energy. The water is then conveyed back into the circuit and supplied to the equipment.

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Units should be equipped with free-cooling devices allow operation even when the external temperature is able to guarantee only partial rather than complete dissipation of the thermal load.

2.21 MAINTENANCE SERVICE: 2.21.1 Preventive maintenance procedures must be adhered to including periodic inspections. 2.22 INTERFACES TO BUILDING AUTOMATION SYSTEM: 2.22.1 For the integration of chiller microprocessor panel to the Building Automation System an

Interface Control Document can be developed by BAS Agency. It can be responsibility of HVAC Agency to provide following to BAS Agency for preparing the interface.

a) Hardware Protocol of Chiller Microprocessor Panel.

b) Software Protocol of Chiller Microprocessor Panel. c) Communication structure relating to collection of message/event information. d) Description of the formatted packets/blocks of data which construct controller

commands/response. e) Complete overview of the system. f) All information described above to be available at one point. g) Written permission to BAS agency to develop the interface without any financial

application. 2.22.2 The unit controller can be capable of Open Protocol communications providing seamless

integration and comprehensive monitoring, control and data exchange with other building automation systems. The Open Protocol Planner & Integrator including all necessary hardware required to integrate with the BMS should be provided by the Chiller Manufacturer.

2.23 START-UP AND INSTALLATION: 2.23.1 Manufacturer can furnish a factory trained service technician without additional charge for

installation and start up of units. Start-up of the system can proceed once the consulting engineer has approved the installation. Manufacturer can provide instruction of the owners personnel on the operation and maintenance of the unit. Manufacturer can provide operating instructions and part lists.

A satisfactory operation test can be conducted in the presence of the construction manager.

Power and water required for operation and testing will be furnished without cost to the works agency. Any damage to the units during shipment and installation can be made good by supplier at no extra cost.

Manufacturers should provide a spare part list (including compressors) which they intend to

stock in Delhi. In addition manufacturer must indicate exact time required for them to refill refrigerant and oil in case of leakage.

Manufacturer should support above schedule by providing parts in their stock in Mumbai.

***** ***** *****

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3.0 DOUBLE SKIN AIR HANDLING UNITS As supplied by base building. . .

***** ***** *****

4.0 VENTILATION FANS: 4.1 CABINET TYPE EXHAUST FANS 4.1.1 Units can be complete factory-assembled and tested of approved manufacture. 4.1.2 Casing can be of 16 gauge galvanized sheets, ribbed and reinforced with access provided

by hand holes in casing panels. Supply air units can have fan section, and filter section with independent base frame with levelling screws and joined together with foam rubber gasket.

4.1.3 Fans can be driven by an electric motor as specified in the schedule of equipment. Motor

ratings are only tentative and where a fan requires a higher capacity motor, the agency can clearly point out the requirement and make his offers accordingly. Motor ratings can be at least 20% over limit lead plus transmission losses but not less than the specified ratings.

4.1.4 Fans to be given 2 coats of epoxy paint after fabrication and mounted on common base

frame with spring type vibration mounts and having a minimum of 25mm static deflection. Fans should be statically and dynamically balanced.

4.2 Filters: 4.2.1 Fresh air fans can be provided with non combustible fibrous cleanable filters. The filter

media can be of non woven type synthetic fibres. 4.3 Installation: 4.3.1 The MS frame work required for the fans will be prepared by the air conditioning agency as

per the requirement. The agency can supply foundation bolts, base plate wherever required, vibration eliminators etc. and he can be also ensure that all the above accessories are placed securely in proper position. All necessary hardware can by GI. The frame work can be given 2 coats of epoxy paint.

4.3.2 Spring Vibration eliminators can be provided with an efficiency of not less than 80%. 4.3.3 Fan inlet and outlet connections can be by means of double flexible connections of the non-

flammable type. 4.3.4 Fan belt drive can be complete with bolts, belt sheaves and suitable belt guard. 4.3.5 After completion of installation the Vendor can give final paint to the fans. Two coats of

epoxy paint can be given.

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4.4 Testing: 4.4.1 Inspect fan and remove objects or debris. Inspect and flush coils and remove debris or

obstructions. Verify that all fire dampers are open and control dampers are to their proper position.

4.4.2 Record the following design requirements for fans and fan motors from the design drawings

and reviewed shop drawings:

a. Manufacturer, model and size. b. Air quantities - cubic feet per minute. c. Approximate fan speed - revolutions per minute.

d. Fan static pressure (total or external) inches of water. e. Outlet velocity - feet per minute. f. Fan brake horsepower. g. Motor horsepower h. Volts, hertz, amperes and service factor at design conditions.

4.4.3 Record the following data from fans and fan motors installed at the project

a. Manufacturer, model and size. b. Motor horsepower, service factor and revolutions per minute. c. Volts, hertz, full load ampere and service factor. d. Motor starter and heater size. e. Equipment location.

4.4.4 Completely adjust fans and duct systems by the adjustment of sheaves, dampers, and other volume and diverting control devices, to obtain the air quantities indicated in the Contract Documents. Integral dampers in terminal outlets and inlets are not to be used for adjustment of duct branches. Adjust outside air and return air modulating dampers to admit the specified quantities of air under all cycles of operation. Adjust final air quantities within 5% of the design requirements. Balance air outlets, with air pattern as shown on the Drawings.

4.4.5 Record the following test data for fans and fan motors installed at the project at final

balanced conditions: a. Fan speed - revolutions per minute. b. Fan suction, discharge and total static pressure (external or total) - inches of water. c. Static pressure drops across filters, dampers in the fan casings in inches of water.

d. Motor operating amperes and voltage per phase at operating conditions.

e. Fan cubic feet per minute as required above. f. Calculated brake horsepower.

4.5 Motors: 4.5.1 Operating Conditions:

Ambient Design temperature for motors can be 45 deg C

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4.5.2 Motors can be of the squirrel cage induction motor type having the following features.

a. Frequency 50 Hz 3%

b. Standards Latest editions of relevant Indian or International Standards.

c. Type of enclosure Totally enclosed for fan cooled (TEFC)

d. Degrees of Protection IP 55 for all motors with class F insulation continuous duty

e. Type of Motor Three phase squirrel cage induction motor

with single bare shaft extension with keyway and key. Shaft to be drilled and tapped with standard diameter hole.

f. Direction of Rotation Suitable for bi-directional rotation, or as

specified in equipment guideline.

g. Treatment of Winding Can be chemically treated to withstand the atmosphere laden with chemical fumes/dust.

h. Additional Features Thermistors can be provided for motor of rating 55 KW and above.

Thermistor can be one per phase. i. Terminal box a. Six terminals with shorting stripes to be

provided. b. To be preferably located on right hand side when facing the driving end or on top. c. To be rotatable in four insulated armoured cables.

k. Earthing Two external and one internal earthing terminal.

l. Starting duty Motor up to 5.5kw suitable for DOL starting & above 5.5 kw for star delta starting / Auto Transformer starting.

m. Name plate Standard. It can indicate equipment number besides technical data of Motors.

n. Painting Synthetic Enamel manufacturers standard paint.

o. Inspection/testing Will be inspected. Tests to be witnessed by Clients representatives at vendors works.

p. Statutory approval Motors can be acceptable to local statutory authorities.

q. No. of starts/hour 6

r. Residual Voltage Starting Suitable for restarting against a residual

voltage of 40% in opposition to the supply voltage.

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s. Bearing Grease Lubricating ball or roller bearing. Vertical motors can have thrust bearings designed to carry the maximum axial thrust.

t. Cables Entries For LT motors, refer schedule

Any provision required for cable entry to the motor can be provided i.e. separate junction box, if required.

4.6 PROPELLER TYPE WALL EXHAUST FANS: 4.6.1 Propeller type fans can be G.E.C or Crompton. Fan can be of blade type, ring or diaphragm

mounted and of the capacity shown in the schedule of equipment. Fans can be provided with gravity type louvers unless otherwise stated.

4.6.2 Fan drive can be single phase or three phase motors as indicated in the schedule of

equipment and can be complete with starter unless otherwise stated. All motors can be of class F insulation.

4.6.3 Fan can be provided with speed regulators. Provide rain protection louver and bird screen

for each fan. 4.7 Installation: 4.7.1 The wooden frame required for the fans will be prepared by the owner to the drawings

supplied by the agency. All necessary hardware can by GI. Base frame can be give 2 coats of epoxy paint.

4.7.2 After completion of installation the Vendor can give final paint to the fans. Two coats of

epoxy paint can be given. 4.8 INLINE FANS:

4.8.1 Inline fan can incorporate SISW direct driven centrifugal fan with TEFC (IP-44) motor. The

fan assembly can be encased in sheet metal housing of 22G GSS and with necessary inspection cover with proper gasket assembly. The fan material can be of galvanized sheet. Flanges can be provided on both side of the inline fan to facilitate easy connection. Flexible anti-vibration joints can be provided to arrest vibration being transformed to other equipment connected to inline fan. Motor can be single phase/3 phase can be mentioned in technical guideline attached in tender.

4.8.2 All single phase can be provided with speed regulator while all three phase fans can be

provided with opposed blade dampers in GSS construction at fan outlet for air balancing.

***** ***** *****

5.0 PUMPS:

5.1 Scope: 5.1.1 The scope of work under this article comprises the supply, installation (including civil work),

testing, commissioning and erection of pumps of the type and capacities specified in the schedule of equipment. Pumps can be suitable for the purpose they are intended. Pumps can be imported. If necessary the agency can provide temporary pumps to meet the completion schedule.

5.2 Description:

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5.2.1 Provide pumps in accordance with the Contract Documents. 5.3 Work Included: 5.3.1 End Suction Horizontal Back pull out type Base Mounted Pumps.

5.4 Submittals: 5.4.1 Submit manufacturers latest data.

5.4.2 Shop drawing submittals to indicate certified pump curves BPSH, pump performance

characteristics with pump and system operating point plotted. 5.5 Quality Assurance: 5.5.1 Select pumps to operate at or near their point of peak efficiency, allowing for operation at

capacities of approximately 25% beyond design capacity.

In addition, select the design impeller diameter so that the design capacity of each pump (GPM and TDH) does not exceed 85% of the capacity obtainable with maximum impeller diameter at the design speed for that model.

5.5.2 In order to ensures table operation and to prevent any possibility of hunting, the pump

curve must be continuously rising from maximum capacity up to the shutoff point. 5.5.3 Make the entire pump assembly including, but not limited to, the casing or enclosure,

suction and discharge flanges, and seals, suitable for operation with the Pump Working Pressure and temperatures indicated on the drawings. For the purpose of this guideline, the pump working pressure is defined as the sum of the scheduled maximum suction pressure and the maximum dynamic head at shutoff developed by the pump for pumping duty specified. Test each entire pump assembly hydraulically at the factory at least 50 psig pressure above the pump working pressure.

5.5.4 Perform a complete factory electric operating and sequence test, capacity performance test,

and hydrostatic test for each factory assembled pumping system prior to shipment. Include a system operating flow test from zero to 100% of design flow for the pumping unit with guideline suction and net discharge pressure conditions specified on the drawings. Verity the accuracy of the system flow with an independent calibrated test flow meter. The factory operating and performance test may be witnessed by the Engineer and Owner. Notify the Owner in writing at least 3 weeks prior to the factory performance test. Before the pumping assembly is shipped from the factory, transmit certified factory performance test data for factory testing including flow, head, and horsepower at all flow rates on a plot of the system flow test. Certify that the pumps have been satisfactorily tested as specified herein before and are in compliance with the requirements of the Contract Documents. Do not install the pumping system before the test data has been reviewed by the Engineer.

5.5.5 Provide flanged connections on suction and discharge drilled to ANSI standards. 5.5.6 Comply with local codes. 5.6 Construction: 5.6.1 Pumps can be as per IS 1520-1960 and can be of the following construction. 5.6.2 Pump casing to be cast iron with smooth water passages and fitted with a bronze

replaceable bearing ring.

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5.6.3 The impeller supplied for the specified conditions is to be one piece bronze. Diameter not to

exceed 85% of the casing cut water diameter. Impeller should be statically and dynamically balanced.

5.6.4 Pump shaft to be stainless steel of a size and design to limit shaft deflection at shaft seal

box to not more than 0.002 inches. 5.6.5 Seal the pump liquid cavity with a face type mechanical seal with NI-Resist stationary seat,

carbon washer, ethylene propylene flexible members, brass metal parts and 18-8 stainless steel spring. Seal to be mounted over a bronze shaft sleeve.

5.6.6 Couple the pump flexibly to a TEFC IP55 electric motor. Motor and pump bearing to be

grease lubricated and sized for a minimum of 100,000 hours average bearing life. Motor and pump to be aligned and mounted on a steel base. Provide a coupling guard.

5.6.7 Mount pump and motor on a common fabricated structural steel base furnished by the

pump manufacturer. Provide in the base provisions for grouting and anchor bolts. Machine surfaces for the motor and pump mounting. Motor mounting to permit horizontal adjustment. Provide the base of sufficient strength to prevent vibration, wrapping or misalignment of the pump and motor when installed without grouting.

N.B. Ensure that the pump is vibration isolated from the structure and that no resonance

occurs with structural elements. 5.6.8 General guidelines: Pumps : End suction back pull out Casing : Cast Iron/Cast Steel Impeller : Bronze conforming to BS 1400 Shaft : Stainless Steel Shaft Sleeve : Bronze Seal : Mechanical Seal Bearing : Ball / Roller 5.6.9 Driver ratings shown are only tentative and Tenderers can select their drivers at least 15%

in excess of the maximum B.H.P. of the pump plus transmission losses, if any. (But not less than specified ratings)

5.6.10 Pump and driver can be mounted on a single bed plate and directly driven through flexible

coupling. 5.7 Accessories and fittings: 5.7.1 The following accessories can be provided with each pump among other standard

accessories required.

a. Coupling guard

b. Lubrication fittings and seal piping.

c. Test or air vent cocks

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d. Mechanical sealing

The following fittings can be provided with each pump along among other standard fittings required:

a. 25mm GI gland drain.

5.8 Installation: 5.8.1 Pumps can be installed as per manufacturer recommendations. Pumps set to be mounted

on concrete inertia block which in turn is mounted on vibration isolation springs. The concrete foundation will be made by the owner to the agencys requirement. The inertia block, spring isolators and foundation bolts, isolation pad etc. can be supplied by the agency. The agency can, ensure that the foundation bolts are correctly embedded.

5.8.2 Pump sets can preferably be factory aligned. Whenever necessary site alignment can be

done by competent persons. Before the foundation bolts are grouted and the couplings bolted, the bed plate levels and alignment results can be submitted to the engineer.

5.9 Motors: 5.9.1 Operating Conditions: Ambient Design temperature for motors can be 40 deg C 5.9.2 Motors can be of the squirrel cage induction motor type having the following features.

a. Frequency 50 Hz 3%

b. Standards Latest editions of relevant Indian or International Standards.

c. Type of enclosure Totally enclosed for fan cooled (TEFC)

d. Degrees of Protection IP 55 for all motors with class F insulation continuous duty

e. Type of Motor Three phase squirrel cage induction motor with single bare shaft extension with keyway and key. Shaft to be drilled and tapped with standard diameter hole.

f. Winding connection Delta Connected Motor above 2.2 KW Star connected box of cast iron 2.2 KW

g. Direction of Rotation Suitable for bi-directional rotation, or as specified in equipment guideline.

h. Treatment of Winding Can be chemically treated to withstand the atmosphere laden with chemical fumes/dust.

i. Additional Features a. Thermistors can be provided for motor of rating 55 KW and above.

Thermistor can be one per phase.

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j. Terminal box a. Six terminals with shorting stripes to be provided. b. To be preferably located on right hand side when facing the driving end or on top. c. To be rotatable in four insulated armoured cables.

k. Earthing Two external and one internal earthing terminal.

l. Starting duty Motor up to 5.5kw suitable for DOL starting & above 5.5 kw for star delta starting / Auto Transformer starting.

m. Name plate Standard. It can indicate equipment number besides technical data of Motors.

n. Painting Synthetic Enamel manufacturers standard paint.

o. Inspection/testing Will be inspected. Tests to be witnessed by Clients representatives at vendors works.

p. Statutory approval Motors can be acceptable to local statutory authorities.

q. No. of starts/hour Unless otherwise specified 3 equally voltage

of 40% in 2 cold starts and one hot restart. r. Residual Voltage Starting Suitable for restarting against a residual voltage of 40% in opposition to the supply voltage.

s. Bearing Grease Lubricating ball or roller bearing. Vertical motors can have thrust bearings designed to carry the maximum axial thrust.

t. Cables Entries For LT motors, refer schedule Any provision required for cable entry to the motor can be provided i.e. separate junction

box, if required.

5.10 Testing: 5.10.1 Tenderer can submit the performance curves of the pumps supplied by them. They can

also check the capacity and total head requirements of each pump to match his own piping and equipment layout.

5.10.2 On completion of the entire installation, pumps can be tested for their discharge head, flow

and BHP test results can correspond to the performance curves. 5.10.3 Tenderers can furnish the required testing instrument and arrange for their connection

required without any additional cost. 5.11 Painting:

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5.11.1 After complete installation and testing, pumps, accessories and fittings can be given two coats, three mills each of approved finishing paint.

5.12 Mode of Measurement: 5.12.1 The pump together with drive motor, (starter wherever mentioned) coupling, coupling guard,

base plate, vibration mounts, will be one unit for measurement. 5.13 Execution: 5.13.1 Rigidly bolt the pump base to the vibration isolation base and fill with concrete or grout after

installation on the isolation base. After final alignment, dowel all pumps and motors 25 horsepower and over to the base.

5.13.2 The pump manufacture to be responsible for aligning in the field prior to start-up of flexibly

coupled pumps. Alignment to be with dial indicator with accuracy of plus or minus 0.002 inch. The pump manufacturer must submit a written report certifying that the alignment work has been performed by his personnel and that the pumps are ready for operation.

5.13.3 Pumps to be levelled up on tapered steel wedges in such manner to permit a minimum of

inch of grout between the pump base and the top of the concrete base. 5.13.4 Pump motors are to be covered during construction period if the motor has to be run the

Mechanical Agency will be responsible to make sure that the area in which the motor is running is clean.

5.13.5 Mechanical Agency to provide lifting eye ring above each vertical inline pump to facilitate

removal of motor for repair. 5.13.6 Paint the entire assembly of each pump with two coats of enamel after shop testing. 5.13.7 All operating controls and safety devices must be demonstrated after each system has

been installed and put into operation at the project site. 5.13.8 Provide drains for bases and stuffing boxes piped to discharge into floor drains. 5.13.9 Provide air cock and drain connection on horizontal pump casings. 5.14 Deleted 5.14.1 Dedicated Pump Logic Controller 5.14.1 Number of Pumps

DPLC can be able to control pumps as required. However, DPLC can have provision for future expansion (modular type) to control upto 8 pumps.

5.14.2 Analog Input Processing DPLC can continuously scan the incoming signal from DPT all the time and keep on

processing the output. Output can be the most deviated one compared to the set point, which will be fed by the user, in DPLC.

5.14.3 Two Additional Analog Inputs DPLC can have provision for two additional analog inputs for:

a. Taking input signal from Flow sensor. This can help the system to protect the pumps against End Of Curve condition.

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b. Taking the input from any external sensor (e.g. return temperature sensor, supply temperature sensor, etc). This input can be used to influence the system externally.

5.14.5 Set Point

DPLC can be set for separate set points as per real time clock. If a lower differential pressure is acceptable during certain periods, for instance after normal working hours or weekends, the set point can be lowered to minimize power consumption.

An external input may also be used to switch between set points, or manually adjust a set point at any time.

5.14.6 Automatic cascade control of pump

DPLC can start other pumps, which are available for operation, whenever system is not able to meet the demand for chilled water. Once demand is met then all the pumps will cut out with changeover, except for one pump. At least one pump will run at minimum 25% speed if DP value is satisfied.

5.14.7 Automatic Sequence Change

DPLC can have automatic changeover facility based on:

a. Fault When any pump/motor/starter fails. b. Operation While running/cascading.

c. Time As per the time set in the DPLC (daily or weekly).

To ensure equal number of hours run by each pump and to control the number of starts (to avoid hunting) on each pump, the system will alternate the sequence of the pumps used each time the system starts.

Additionally, should the demand not allow the pump set to completely shut down over a 24 hr. Period, the DPLC can stop the pumps that are running and start the remaining pumps at a predetermined time of the day.

5.14.8 Auto Testing

DPLC can start the pumps, which have not been cut-in because of lower load, for 2 seconds each day, to ensure that all the rotating elements do not bind.

5.14.9 Displays

Through the monitor keypad, all variable parameters are adjustable, current status of settings and measured values to be displayed on the minimum 2 line x 24 character liquid crystal display.

Individual menus are available for monitoring individual pumps, zones, settings, alarms and ON/OFF functions.

PUMP STATUS * Running Hours of each pump * Actual pump status, (running, not available, standby, allocated to zone, fault) ZONE STATUS

This menu is the main operating menu where all the setting and operating parameters can be viewed e.g.

* Current operating set point * Measured values in the system

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* Operating capacity in terms of total output * Mode of operation for the zone * Clock programs (relating to set point differential pressure value) * Standby pumps (if any) * Pump change over time * Friction loss compensation * Pump priority * System response times SETTING MENU In this menu all parameters for the operation of the pump set can be adjusted as required * Set points (up to 10) * On/Off function (used to prevent unnecessary cycling at low demands) * Displayed differential pressure units (Meter, Bar, PSI, mBar, kPa) * Real time clock programming for any time of the day, week, or weekend) * Zone configuration / Friction loss compensation 5.14.10 Pump Priority It is possible to give the required running sequence to the pumps e.g. 1 2 3 etcIn this case pump marked as no 1 will always start first. However, in case of

equal piority (1 1 1) all pumps will become pump no 1, whenever pumps are cascading. 5.14.11 ALARM The alarm menu to display all faults that occur during operation, logging the time and date

of when the fault occurred and when it was corrected, or whether it is still an actual fault, and up to 10 faults to be maintained as history in the controller.

Examples of faults * Mains failure

* Analogue input (differential pressure transducer) fault * High discharge pressure fault * Low discharge pressure fault * Motor thermal overload fault 5.14.12 Communication features:

- Communication protocol MODBUS will be provided to display the system values in BMS such as an option:

a. DP value(s). b. Current drawn by each pump. c. Power consumed by each pump.

BMS agency will bring his RS 485 (MODBUS) link directly to this DPLC communication port.

5.15 Deleted 5.16 TRANSMITTERS:

Differential pressure transmitters can be field mounted and can transmit an isolated 4-20mA DC signal indicative of process variable to the pump logic controller via standard two wire 24 DC system. Unit can have stainless steel wetted parts with two 0,25male NPT process connections. It can be protected against radio frequency interference and can have watertight, NEMA 4 electrical enclosure capable of withstanding 14 bar static pressure with a 0.5NPT conduit connection. Accuracy can be within 0.25% of full span.

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5.17 CONTROL ENCLOSURE

IP-55 powder coated steel double enclosure for outdoor installations can house all the electrical components.

The enclosure will be supplied loose for remote mounting. It will be adequately ventilated for use in conditions up to a maximum ambient temperature of Mumbai but not less than 45deg C.

***** ***** ****** ROW COOLING SYSTEM CHILLED WATER BASED. Units shall be 42 U, with minimum width & include casters and levelling feet to allow ease of installation in the row and provide a means to level the equipment with adjacent IT racks. The Fans shall be configured for draw-through air pattern to provide uniform air flow over the entire face of the coil. Each unit shall have hot swappable fans with at least one fan in redundant mode. Fans shall be variable speed capable of modulating from 30-100%. Fans shall soft start to minimize in-rush current when starting. Row cooling can be the product of a manufacturer normally supplying this type of equipment and who can show evidence having completed at least five installations of approximately the same capacity, that have been in successful operation for the last five years. Input Power Feeds should be Dual. Each unit should be supplied with display to allow monitoring and configuration of the air conditioning unit through a menu-based control. Functions include status reporting, set-up, and temperature set points. The microprocessor based controller shall activate a visible and audible alarm in the occurrence of all possible events through the unit display. A leak detection sensing cable shall be shipped along with the unit. If water or other conductive liquids contact the cable anywhere along its length, the main controller visually and audibly annunciates the leak. The unit shall include a network management card to provide management through a computer network through TCP/IP. Management through the network should include the ability to change set points as well as view and clear alarms. Chilled water system shall utilize a three-way valve to regulate the amount of chilled water to the cooling coil to maintain desired conditions. Valve shall be piped internally with unions to allow for easy replacement in the field. The standard valve pressure rating shall be 600 psig. Valve Actuator: Actuator shall be direct connect rotary floating point style actuator and should be capable of being replaced without disconnecting piping from the valve. Factory Installed and wired condensate pump shall be provided along with the units. Standard Air filter:

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be insulated with closed neoprene thermal insulation. All piping connections should be made at the rear of the unit for top or bottom accessibility. All the cooling units shall connect each other to work as a group. Capacity modulation shall be done by all the units together based on the number of live units available in the group. 6.0 PIPING:

6.1 Scope:

6.1.1 The scope of work comprises the supply and laying of all pipes required for this Project.

The engineers drawings show the general layout of the piping and they are not meant as working drawings.

6.2 Chilled Water and Drain Piping:

Drain piping can be same thickness as chilled water piping. Drain piping can be GI.

6.2.1 All piping can be black steel unless otherwise stated. Pipes/fittings can be externally

cleaned with wire brush and given two primary coat of red primer before being installed. Piping/fittings can be painted with a suitable anti corrosive paint before insulation. Pipes can be sloping towards drain points. Drain piping & fittings can be GI.

6.2.2 Fittings can be new and from standard manufacturers. Fitting can be malleable casting of

pressure ratings suitable for the piping system. Fittings used on welded piping can be of the welded type. Flanges can be new and from standard manufacturers. Supply of flanges can include bolts, washers etc. as required. Metered or fabricated fittings cannot be permitted. All piping 50mm and below can have socket welt fittings.

6.2.4 Tee off connections can be through equal or reducing tees, as required. Ferrules welded to

the main pipe can be used for tee connections which are 2 sizes smaller than the main pipe. Drilling and tapping of the walls of the main pipe cannot be accepted. Standard tees can be used in case the tapping is the same as pipe size or one size smaller.

6.2.5 All equipment and valve connections, or connections to any other mating pipe can be

through flanges. Flanges can be screwed upto 50mm size and welded above 50mm.

6.2.6 All piping is subject to the approval of project engineer and sufficient number of flanges and unions can be provided as required.

6.3 Butterfly & Ball Valves:

6.3.1 Butterfly valves can have stainless steel shaft and gray iron body. Body style can be lug

type flanged. Disc material can be nylon/ epoxy coating coated SG iron with black nitrile seat providing bubble tight shut off. All valves 150mm and above can be provided with gear operators. Valves can conform to BS 5155/ IS 1536. Valves can be suitable for 15 Kg/cm2 operating pressure.

6.3.2 Valves 50mm and below can be Ball valves. 6.4 Balancing Valve: 6.4.1 Balancing valves up 50mm size can be made of copper alloy with Brinell hardness of at

least 130 and a pressure rating of 20 Bar. 6.4.2 Valves 65mm and larger can be of CI flanged (CI as per BS 1452). Valve can be fitted with

a pressure balanced cone to allow the valve to be closed and opened easily.

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Adjustment and setting can be made with a digital Hand wheels. 6.4.3 Flow measurement and balancing can be with an accuracy of 4% to 7% in the normal

operating range. Pressure measuring nipples can be provided for measuring differential pressure and can be integral with the body. Nipples can have leak tight shutoff when not in use.

6.4.4 All valves can be double regulation type with indicator scale from 0 (full shut) to full open

with integer setting position.

Valves can be suitable for 15 Kg/cm operating pressure. All valves can be manufactured as per ISO 9001.

6.4.5 One computerized balancing instrument with ISO certificate can be supplied by the agency to the owner which can be handed over after testing and commissioning. In addition to measuring flow rate, DP and temperature the instrument can have capability to store the results of balancing and to log the measured values. The saved data can be printed out as part of the agencies commissioning documents.

6.5 Check Valves: 6.5.1 Check valves can be provided conforming to the following guidelines:

Size Construction Ends

12mm to 50mm Gun Metal i. Screwed Female 65mm & over Body C.I. ii. Flanged. Seat & Disc Gun Metal

Swing check valves can normally be used in all water services. Lift type valves may be used in horizontal runs. All release and clean out plugs can be provided and valves can be suitable for 21 kg/sq.cm. test pressure. Check valves can be of non slamming type to prevent water hammer either by providing springs or accumulators. Valves can be suitable for 15 kg/cm2 operating pressure.

6.6 Strainers: 6.6.1 Strainers can be Y type with Cast Iron or fabricated steel bodies designed