supply and installation and testing and commissioning of vrf type inverter ac system , supply & installation & testing & commissioning of vrf type inverter ac system , ( i ) part-a ( high side ) inverter technology based 18 hp vrf type air-cooled duct-able split air-conditioning systems outdoor units of capacity 14 . 4 tr each equipped with at least two nos . dc inverter scroll compressor , i heat exchangers , fan and drive motors and starters with overload protection for the same . , ( ii ) vrf duct-able type indoor unit with individual controller for cooling application equipped with liquid line filter , expansion valve , cooling coil , air filters , blowers and drive motors and starters with overload protection for the same . ( a ) the indoor unit of cooling capacity of 8 . 0 tr each , ( b ) the indoor unit of cooling capacity of 4 . 0 tr each , ( iii ) refnut ( y ) joint odu- odu , refnut ( y ) joint idu- idu , part-b ( low side ) ( i ) two length duly insulated copper piping of suitable size to interconnect the indoor and outdoor units , ( ii ) ms epoxy coated base frame & vi pads for installation of outdoor unit , ( iii ) upvc suitable drain water piping insulated with 19 mm thickness of nitrile rubber insulation , ( iv ) ducting , grills , diffusers , dampers , insulation , canvas , stands etc ( a ) supply , installation , balancing and commissioning of factory fabricated gss sheet metal ducting ( sheet may be make of tata/ sail/ jindal/ ispat ) complete with neoprene rubber gaskets , elbows , splitter dampers , vanes , hangers and supports as per the requirements at the site locations , needed duct are as bellow:0 . 63 mm thick sheet duct , 0 . 80 mm thick sheet duct , 1 . 00 mm thick sheet duct , ( b ) supply and fixing of powder coated extruded aluminum grills with volume control dampers , ( b1 ) supply and fixing of powders coated extruded aluminum grills without v . c . , ( c ) supply , fixing testing commissioning of supply air diffuser of powder coated aluminum with aluminum volume control dampers with anti smudge ring and removable core . , ( d ) supply , fixing testing commissioning of return air diffuser of powder coated aluminum without volume control dampers with anti smudge ring and removable core . , ( e ) supply and fixing of acoustic lining of duct with open cell nitrile rubber densely applied by adhesive confirming to standard specification as below:thickness of 6mm , thickness of 9mm , ( f ) supply and fixing of external thermal insulation on supply air duct with closed cell crossed link polyethylene foam of 13 mm thickness and with factory laminated al pe foil , ( g ) supply and fixing of fire retardant canvas connection , ( h ) supply and fixing of channel support for copper piping , ( v ) supply , fixing , testing and commissioning of main electrical panel with suitable incomer and outgoing with indicated switch , push button and mcbs , starters and overload protectors for each motor of fan , blower and compressors etc . complete in all respects . , ( vi ) power and control wiring ( a ) supply and laying of suitable power cable with end connection :4 core x 10 sq . mm , 4 core x 16 sq . mm , ( b ) supply and laying control cum transmission shielded wiring between odu to idu of copper 3core x 1 . 5 sq . mm with pvc conduit with earthing , ( c ) installation , testing , commissioning and other miscellaneous items i . e . refrigerant for topping up in piping and other works left to install the indoor & outdoor roof ac system , ( d ) supply , fixing , testing of air curtain for door length upto 2 meter along with switches and other required controls .