annual comprehensive and preventive maintenance of air-conditioning machines installed in the different sites within entire north bengal medical college and hospital campus in the dist of darjeeling for the period of 01 ( one ) year.- 1 annual comprehensive & preventive maintenance of air-conditioning machines installed at total hospital & collage, dental collage & hospital, nts, bsc nursing collage and others site within the campus of nbmc&h, with all type of spare materials like- all type of referigarent gas, all type of capacitor, all type of compressour, all type of pcb board & others materials which is required for maintanance. 2 split air conditioning machine at total hospital & collage, dental collage, nts & bsc nursing collage.total no of m / c-i ) 2 ton machines- 520 ( five hundred twenty ) nos.total capacity-520x2=1040 ton 3 4 ton tower type split.total no of m / c- 8 ( eight ) nos. total capacity-8x4=32 ton 4 5 ton ductable split-8 ( eight ) nos.total no of m / c- 8 ( eight ) nos.total capacity-8x5=40 ton 5 7.5 ton ductable split-25 ( twenty five ) nos.total no of m / c- 25 ( twenty five ) nos. total capacity-25x7.5=187.5 ton 6 8.5 ton ductable split-15 ( twenty five ) nos. total no of m / c- 15 ( fifteen ) nos. total capacity-15x8.5=127.5 ton 7 11 ton ductable split- 4 ( four ) nos. total no of m / c- 4 ( four ) nos.total capacity-4x11=44 ton 8 16.5 ton ductable split-9 ( nine ) nos. total no of m / c- 9 ( nine ) nos.total capacity- 9x16.5=148.5 ton 9 22.5 ton ductable split-3 ( three ) nos.total no of m / c- 3 ( three ) nos.total capacity- 3x22.5=67.5 ton. 10 distribution wiring in 1.1 kv single core stranded fr pvc insulated & unsheathed copper wire ( brand approved by eic ) in 20mm size pvc rigid conduit fr ( precision make ) incl. necy. fittings as required a ) 2 x 36 / 0.3 ( 2.5 sqmm ) + 1 x 22 / 0.3 ( 1.5 sqmm ) ecc