tender for replacement of precision acs in it data centre.; 1 supply, installation, testing and commissioning of direct expansion microprocessor based bottom discharge precision ac units as per the specifications complete with double skin sandwich side panels 15mm thick puf insulation, air cooled condenser with fan speed controller to modulate fans for winter operation, variable speed dc brushless compressors, slant type evaporator coil with hydrophilic coating, electronically commuted brushless motor backward curved plug fans( in floor fan section), electronic expansion valve, first fill of environment friendly refrigerant (r410a), electric heater/s, variable capacity auto-modulating humidifier and vibration isolators. each unit shall have motorized al volume control dampers with position feedback actuators with control/power cabling to crac unit microprocessor control.the unit shall be selected for cold aisle temp at 22±2° c deg c, 50±5% rh. unit shall work based on supply air set point. 2 low side accessories & works (refer sow & technical specs. document). site visit mandatory for quoting of this line item 3 buyback of existing schneider make precision air conditioning with with old piping