Raja Ramanna Centre For Advanced Technology Tender

Air Handling Unit: Design, fabrication, supply, installation, testing & commissioning of Double Skin Air Handling Unit (AHU) constructed from outer skin with 1mm thick precoated G.I. sheet (of minimum 180 GSM) & 1mm thick inner G.I. sheet (of minimum 180 GSM) with 50mm thick injected PUF insulation of 40 kg/m3 approx. with thermal break profile complete with aluminium extruded framework structural section for VRF condensing units and comprising of following sections: a. Mixing chamber for Fresh Air & Return Air with volume control dampers. b. Pre filter section with G4 filter as per EN779 c. Cooling coil section with 6 rows deep cooling coil suitable for above VRF condensing units with Cooling option, necessary Expansion & Communication Kits compatible for connection of VRF outdoor units in single / multiple form along with 1 mm thick S.S. drain pan and drain outlet. Hydrophilic coating shall be provided on cooling coil. Drift eliminator shall be provided. d. UV lamps section with UV lamps e. Heater section with thyristor controlled re-heater f. Humidifier section complete with required water heaters, float valve,low water level safety switch, piping and necessary fittings. g. Blower section with statically and dynamically balanced direct drive, Plug fan and Squirrel cage induction motor (with VFD) of TEFC type suitable for 3 -phase, 400V, 50Hz of efficiency class IE3. The winding of motor shall be class 'F' insulated and fully tropicalised, motor shall be rated for continuous duty as defined in IS: 325 for blower with adjustable base frame, fitted on a common extruded Aluminium channel using anti vibration mountings for silent and vibration free operation. h. Fine filter section with F9 filter as per EN779 i. Temperature sensor and RH sensor with transmitter unit and associated cabling, differential pressure transmitter to maintain the constant flow of air in different choked condition of filters, differential pressure switches across fine and pre-filter for monitoring the condition of the respective filter j. Flanged connection at the inlet & outlet of AHU with volume control damper for integrating to the main duct lines. l. Suitable inspection doors for filter, coil & blower sections. m. Suitably rated antivibration (Cushyfoot) mountings for AHU installation. Including all other components and accessories required for proper operation of AHU and to achieve required temperature (25 ± 1˚C) and relative humidity (50% ± 10 %) as per tender specifications in following capacity: AHU/22000 CFM /56 TR/80 mm WG. S.P.

VRF Outdoor Units: Design, supply, installation, testing & commissioning of 28 HP Modulating Outdoor / Condensing units with Cooling Option complete with hermetically sealed DC Inverter / Digital Scroll Compressors, Condenser coils, variable speed condenser fan with motor, Microprocessor Controller etc. The unit shall include the necessary expansion & communication kits compatible for connection of VRF outdoor units with AHU mentioned above in single / multiple form. The units should be operated on Refrigerant - R410A. The condensing units will be installed at suitable place for compact run of piping along with MS raised stand with vibration isolation pads as per drawing and technical specifications.

Inter-connected Copper Refrigerant piping for VRF System: Hard drawn copper refrigerant piping of 18 G in brazed construction between AHU & VRF Outdoor / Condensing units with class 'O' nitrile rubber insulation with Aluminium foil (19 mm thick), 16 G. G.I. perforated tray for Refrigerant piping & cabling etc. of various widths with support & clamps etc. required for proper installation, operation and controls of the units (the average running distance between VRF Condensing/outdoor units and AHU shall be approximately 20 meters). All pipings shall be pressure tested for 48 hrs. pressure hold test at minimum 1.5 times the working pressure. Suitable weight bearing supports shall be planned for all vertical headers / pipe networks.