comprehensive annual maintenance contract of ductable split air conditioning system of make-voltas installed at administrative building of omkareshwar power station , amc of voltas make- air cooled ductable split air conditioning system , model no . dcush75 ( for 24 months ) . , amc of voltas make- air cooled ductable split air conditioning system , model no . dcuh55 ( for 24 months ) . , note: 1 . the quoted rates by the bidder shall be for 24 months , however , the payments shall be regulated on the basis of tcc clause no . 6 . 0 . 2 . bidders are requested to verify carefully the amount entered by them in respective column and the amount generated automatically through formulae before uploading it to the portal