SITC of Air cooled Precision Air conditioning systems and its associated works for HPC Improvement

Amount

Rates quoted shall be inclusive of detailed design and Engineering, shop drawings, supply, transportation to site, all taxes & duties, lifting, shifting, positioning, installing, testing & commissioning, air & water balancing, training, IOM manuals and 1-year warranty etc.

Precision PAC unit Specifications:

Supply, Installation, Testing and Commissioning of Floor mounted, Direct expansion, High Precision Packaged Air conditioners (PAC) of capacity 20 Tr each with bottom discharge consisting of inlet filter section with washable filters, blow / draw through backward curved centrifugal fan, EC motor & drive assembly, DX Cooling Coil, Heater Banks to maintain humidity inside the space, condensate drain pan, the entire air cooled condenser coils and it’s assembly, Microprocessor panel, digital display, programmable control & recording unit complete set, air cooled condenser having in built Humidifier and heaters to control humidity level in the conditioned area. The safety cut outs such as HP/LP switch, Temperature cut out, overload relays, etc., suitable to operate on 420V +/-20V, 50Hz, 3ph, AC power supply, complete with all necessary accessories.

i. Precision PAC units shall be required to operate for 24 hrs per day throughout the year.

ii. Type of Compressor: Hermetically sealed Scroll compressor. Compressor shall be mounted on suitable vibration isolation mountings and shall be complete with high/low pressure safety controls, crankcase heaters and built in over load protection. Compressor shall be driven by suction gas cooled motor of adequate capacity suitable for operation on 420V +/-20V, 50Hz, 3ph, AC power supply.

iii. Number of Refrigeration circuits: 2 (two) of equal capacity

iv. Type of Condenser units: Air-cooled condenser with integral sub cooling circuit with fan and EC (Electronically commutated ) brushless motor operating on 1 ph, 50 Hz, 220V +/- 20V AC power supply

v. Evaporator Fan: EC (electronically commutated ) brushless motor operating on 3 ph, 50Hz, 420V +/-20V AC power supply.

vi. Inside environmental conditions to be met with the operation of 2 units Temperature: 22 +/-2°C, Relative humidity: 55 +/-10%. +45°C (approx.) during summer, System design shall cater these extreme conditions and shall not have any effect on the performance and functioning of the Air conditioning system.

vii. A/C units shall be provided with latest Microprocessor based controller that monitors, displays and operates the AC system automatically. Suitable sensors shall be provided for monitoring the return air temperature and humidity. Heaters / humidifiers / compressors shall be actuated through the controller based on the temperature and humidity. The microprocessor based controller shall monitor / displays the required parameters and provide necessary alarms. Auto-start with necessary time delay after power interruption shall be in built feature of the Microprocessor.

Viii. Refrigerant gas: R410A / R407C or equivalent eco friendly refrigerant. ( R - 22 or equivalent refrigerant gas is not acceptable).

ix. Humidification and De humidification: Electrical heaters of adequate capacity complete with safety thermostat to cut off the power supply and trigger the alarm in the event of overheating. The heating system shall serve the dual purpose of heating and dehumidification to maintain the specified temperature and relative humidity as required. Suitable humidifier shall be provided for precise control of relative humidity.

x. All listed accessories should be part of scope; BMS integration software details( Read and write parameters) & MODBUS 485 RTU / BacNet protocol Interface and card should be included under the scope of supply. Every module together should have one power panel. 2 PF contacts to be provided for intergartion with Fire Detection system. Remote alarm panel with high decibel audible alarm indicating status of all units is to be provided which will be located within a maximum distance of 30m. Sequencer cards and related hardware shall be included in the cost of the package to enable sequential timed running of equipment.

xi. Insulated Refrigerant piping between indoor & outdoor unit should be considered under the scope. The distance between indoor & outdoor unit could be upto 20M and tenderer has to include necessary de-rating in performance figures, if any. However contractor shall take necessary measurements before bidding, to verify the proposed unit is suitable for the application.

Xii. Additional drip tray below the floor stand of each unit if need.

PAC-1 ( 20 Tr, Indoor and outdoor units )

PAC-2 ( 20 Tr, Indoor and outdoor units )

Refrigerant piping :

Refrigerant piping hard drawn Grade L copper pipes shall be suitable for refrigeration duty. Copper pipes shall be neatly laid and clamped to walls with wall clamps or run on GI cable trays and tied with cable ties.

Specification for Hard drawn grade L copper refrigerant lines, between Indoor and outdoor units The size of the copper tubes shall be strictly as per the Precision PAC unit manufacturer’s recommendations.

Supply and Installation of Hard drawn grade L copper refrigerant line (Hot gas line).

Supply and Installation of Hard drawn grade L copper refrigerant line (Liquid line)

Supply and Installation of Volume control dampers with actuators suitable to fix in the supply air outlet of each packaged AC unit and complete as required. Damper motors shall be electrically interlocked with packaged unit so that damper opens only when the unit is ‘ON’ and closed when the unit is switched ‘OFF’. Make for Volume control damper.

Supply and Installation of condensate water drain piping with 40mm dia. CPVC pipe (IS marked) with necessary bends / fittings / U traps complete as required.

Supply and Installation of 40 mm dia. (IS marked) GI piping with necessary fittings / fixtures complete as required for Humidifier line.

Supply and Installation of waterflow sensor to sense any water leakage below false flooring and connection to control panel of the units for raising an alarm

Supply and Installation of remote alarm panel with high decibel audible alarm to indicate failure and a visual alarm panel indicating status of all unit and kept in the BMS room. The quoted rates shall be inclusive of necessary cabling with laying.

Supply and Installation of MS frame metal works for inddor and outdoor units with cable trays, clamps for pipes and cables, anti vibration rubber pads and it’s supports and necessary Enamel Painting etc., complete as required suitable for housing indoor unit on false floorings, upto a height of 600 mm. MS structural stand with channel or angle framework, as required, for mounting of outdoor units, suitably painted (red oxide primer plus enamel finish) after installation for rust prevention. (This is entire package for the installation frame works)

Supply and Installation of Fire / smoke dampers complete as required to install at supply and return air path. Test certificates for Fire dampers shall be provided along with dampers

Supply and Installation of Fire damper actuators operating on 230 or 24V AC / DC power supply

Supply and Installation of Ducting: Design, fabrication and supply of complete duct system with plenum dampers, hangers, anchor fasteners, vanes, access door etc., complete as required shall be the scope of vendor. Existing GSS ducting running in the conditioned area will be retained. AC vendor shall interface the PAC units with the existing ducting.

Design, fabrication and Supply of 0.8mm thickness GSS ducting with necessary accoustic insulation.

Supply and Installation of Black flexible closed cell elastomeric Nitrile rubber thermal insulation of 10mm+/-1mm thickness suitable for thermal insulation of GSS AC Duct. The insulation shall have fire performance such that it passes class I as per BS 476 Part 7 for surface spread of flame also pass fire propagation requirement as per BS 476 Part 6 to meet the Class O fire category. Unlike other generic materials it should be self extinguishing does not drip fire balls and does not spread flames. The adhesive shall be solvent based / water based rubber insulation adhesive free from Benzene. Make of the thermal insulation and adhesive shall be clearly indicated in the technical bid. Technical specification / catalogue of thermal insulation and adhesive shall be provided along with technical bid.

Supply and Installation of under floor insulation of floor slabs, for false flooring areas to avoid any condensation, as shown in HVAC layout drawings, with fire retardent, physically cross linked, closed cell polyolefin foam insulation, 25 kg / M3 density, thermal conductivity of 0.032 W/mK, 20 mm thickness without any facing; fire retardent adhesive shall be applied for 100% coverage on the aboveside of slabs; alternatively, self adhesive type of insulation may be used with factory-applied adhesive; insulation shall cover any projections, invert beams etc.

Supply and Installation of Manually operated Volume Control dampers fabricated out of galvanized steel sheet (GSS) in supply air duct

Supply and Installation of Air Grilles, suitable for floor mounting on false floorings, suitable for grid size, grille shall replace one entire floor tile without distrubing adjacent tiles, in heavy duty anodised aluminium construction and powder coated to RAL9010 or other finish as per Architect's choice of colour, bar type blades, w/o volume control dampers, as per drawings & schedules.

Specification for Electrical Works:

Design, Fabrication, and supply, testing and commissioning of compartmentalized, front operated, free standing, floor mounting type, for indoor application with dust and vermin proof Electrical distibution panel. suitable for the operation of 2 Nos. of 18+/-1 TR cooling capacity Precision AC unit to be installed. The panel shall be designed for 3-Phase and Neutral, 420+/-20 Volts, 50 Hz AC power supply system and to withstand a short circuit level of 25 kA rms symmetrical. Panel shall be of sheet steel clad, totally enclosed, folded sheet or with angle iron frame work (According to the size and rating of panel) construction with CRCA steel sheet of thickness not less 2 mm. ( It is mandatory to get the drawing approval from IMSc before fabrication of the panel and the specification shall be sutiable of OEM recommendation ).

Supply and laying of armoured / flexible copper power cables to interconnecting the Electrical panel and Precision PAC units.( Incoming power cables to the Precision PAC units ) The size of the cables shall be as per manufacturer recommendation / as per standards. Specifications Cables shall be copper power cables Conforming to IS 7098 PT-1 with following specifications. Grade:1.1 kV. Core color: Red, Yellow, Blue and Black. Copper conductor: stranded. Inner sheath of PVC tape. Insulation XLPE, Overall FRLS PVC outer sheathed. Galvanized steel flat strip / round wire armored. All power terminations shall be made with proper lugs and approved manner All power cabling / control wiring shall be laid in cable trays with proper clamping. ( It is mandatory to fullfil the cable size and the specifications as recommended by the OEM ).

Supply and laying of armored / flexible copper power cables and the control cables to interconnecting and interlocking the Indoor and outdoor units of Precision PAC units. The size of the cables shall be as per manufacturer recommendation / as per standards. Specifications Cables shall be copper power cables Conforming to IS 7098 PT-1 with following specifications. Grade:1.1 kV. Copper conductor: stranded. Inner sheath of PVC tape. Insulation XLPE, Overall FRLS PVC outer sheathed. Galvanized steel flat strip/round wire armored. All power terminations shall be made with proper lugs and approved manner All power cabling / control wiring shall be laid in cable trays with proper clamping. ( It is mandatory to fullfil the cable size and the specifications as recommended by the OEM ).

Supply and laying of Aluminium armoured UG power cable between Substation MV panel-2 to the main power panel of PAC placed in HPC room.

4C x 120 sq mm Aluminium conductor XLPE armoured power cable including both end cable terminations of this power cable.

Pressure testing, vacuumising & gas charging of the entire PAC refrigerant lines and Testing and commisioning of the systems with necessary documentation.

GRID2CHIP

Bidder Name

GRID2CHIP

SEASON CONTROL PRIVATE LIMITED