three years annual maintenance of entire air conditioning system for srijani audotorium hall and newly constructed conference hall of dmc office building , city centre durgapur -16, ward no. 22 of durgapur municipal corporation.- 1 servicing & maintenance of 40tr central a.c unit ( make- voltas ) with 3-phase50h.p compressor motor ( make abb ) including all labour & materials complete at site. 2 servicing & maintenance of 7.5 tr ductable split ac ( make- voltas ) with sealed type compressor motor ( make- carries voltas ) including all labour & materials complete at site. 3 servicing & maintenance of 1.5 tr split ac ( make- voltas ) with reciprocating type ( make-kilosker compressor ) including all labour & materials complete at site. 4 servicing & maintenance of 2 tr split ac ( make- hitachi ) with reciprocating type ( make- ( hitachi ) rotary compressor ) including all labour & materials complete at site. 5 servicing & maintenance of 150tr cooling tower with 3phase 1 h.pcompressor motor ( make- hindustan motor ) including all labour & materials complete at site. 6 servicing & maintenance of 5.5 tr central a.c unit ( make-hitachi ) with hitachi scrolled sealedtype compressor including all labour & materials complete at site. 7 servicing & maintenance of 11tr central a.c unit ( make- hitachi ) with hitachi scrolled type compressor including all labour & materials complete at site. 8 servicing & maintenance charging of r-22 refrigerant including all labour & materials at site. ( as per requirement ) servicing & maintenance charging of r-22 refrigerant , solenoid valve with coil , complete system flash with purging nitrogen & vaccume of system leak detection , additional refrigerant after nitrogen flash & commissioning of system , repair & fixing of logical control card of ductable unitincludingdefective maintenance of electrical & electronic control panel accessories with cable etc.including all labour & materialscomplete at site.