supply and installation of pac in sro data centre supply and installation of 1 no . of 7 tr precision air conditioner and sequencing it with existing 2 pacs at data center , indian oil bhavan , sro , chennai , supply , installation , testing and commissioning of bottom discharge top return high sensible dx type precision air conditioning unit with air cooled condenser . the pac should be complete with direct driven backward curve fans with ec motor , single / multiple scroll compressors , flat evaporator coil with hydrophilic blue fin coating , safety controls for dx mode , electronic expansion valves integrated with microprocessor controller , multistage heaters , humidifier , microprocessor controller , inbuilt electrical panel . the unit should consisting of inlet filter section with eu-4 filters , ss condensate drain pan , microprocessor panel with digital display , programmable control & recording unit . the unit shall be suitable for operation on 415 v 50 hz ac supply . the display panel shall display date , time , actual & set values , operating conditions , signal faults , collective faults limiting values . the cabinet should be with 1 . 2mm thick gi sheet coated with epoxy-polyester paint and the panels are lined on the inside with heat- and sound-proofing insulation to class 1 insulation shall be polyurethane sheet with minimum 15mm thickness having better thermal & acoustic properties . the scroll compressors are suitable for r407c refrigerant and the air cooled condenser should be inclusive of multirow coil and axial fan with fan speed controller . evaporator coil should be fully flat with hydrophilic bluefin coating and should be completely access from front side of pac . the evaporator fan should be direct driven backward curve fan with ec motor . the pac should have inbuilt sequencing controller &snmp ( modbus protocol ) bms integration . unit should be capable of receiving signal from fire alaram panel and trip the unit under emergency . anti corrosive coated condensor coil to avoid corrosion . the return air to pac is 24deg c @50% rh & the outside ambient temperature is 40 deg c for chennai . , 7 tr nominal capacity pac unit capacity . ( 1w ) @ 4800 cfm with ec fan with snmp card for web monitoring , motorised damper , snmp card for remote monitoring , lifting , shifting & positioning of pac units . , supply & installtion of ms stand for housing indoor unit . the stand should be coated with 2 coats of rust proof epoxy paint . height of the stand shall be as per available false floor height . , supply & installtion of ms stand for housing outdoor unit . the stand should be coated with 2 coats of rust proof epoxy paint . , supply & installation of suiatble hard drawn copper piping between indoor & out door for suction & discharge line of suitable size including all fitting & accessories . copper piping should be suitably supported at regular intervals . the copper pipe should be insulated with 13mm thick nitrile rubber insulation inside the conditioned area . ( measurement will be per circuit ) , supply & charging of eco friendly refrigerant . , supply & installation of 2 . 5 sq . mm copper armoured control cable between indoor & outdoor unit for each unit . , supply & installation of copper flexible pvc shielded power cabling between isolator & indoor unit for each unit . customer or electrical contractor have to provide 3 phase power near pac units . , supply & installation of cable for sequential controller operation of all the units , supply of ms supply air grills with powder cotaed -595 x595 mm with volume control damper with 55% -65 % opening for more airfloe , supply and installation of cpvc piping for humidifier line including elbows with necessary supporting arrangement . 25 mm dia , isolation valve of humidifier line , supply & installation of cpvc drain piping with 6 mm thick nitrile rubber insulation . 32 mm dia , installation , testing & commissioning of pac byse engr & software integration , minor civil works ( for refrigerant piping , humidifier & drain line only ) & false flooring modifications