tender for upgradation and optimization of centralized air conditioning system at rangghar auditorium, dibrugarh university , installation of new ac units , supply, installation , commissioning and testing of non-inv type ducted and package 23.0 tr air conditioner including package outdoor shifting at installation site with rubber pad ,testing -flushing with n2 & pre commissioning . , 1_1/8 hard/soft copper piping with 13mm/19mm nitrile rubber insulation with fitting, support and brazed for suction and liquid line. , 5_8 hard/soft copper piping with 13mm/19mm nitrile rubber insulation with fitting,support and brazed for suction and liquid line. , 4x2.5 sqmm cu communication copper shielded cable with conduit , 25mm dia drain piping with 9mm nitrile rubber insulation. , gss ducting thickness 0.63 mm sheet (24 g) and 0.64 mm sheet (22 g) , duct thermal insulation with 13 mm thk nitrile rubber , supply and fixing of acoustic lining inside sheet metal ducts with open cell elastrometric nitrile rubber of density 150kg/cub.mtr and thermal conductivity of 0.036 w/m k , supply installation of aluminium power coated return air defusser without vcd , refrigerant gas-r410a charging. , optimization on exiting ac system , shifting, reinstallation, recommissioning and gas charging of 7 numbers 11 tr outdoor unit , expansion valve , dryer filter , flashing whole system and leakage check with n2 , replacement of faulty compressor 11 tr , replacement of faulty controller , replacement of faulty contactor , replacement of faulty sensor , supply duct line modification and insulation in appropriate way where as require , return duct line modification and insulation in appropriate way where as require , grill supply and fitting in place of existing diffusers