comprehensive maintenance contract for ac units , water coolers and purifiers at rajahmundry airport , comprehensive maintenance of air conditioning units , water coolers and water purifiers of following rating and capacity of various makes at different locations including routine & preventive maintenance , breakdown repairs & servicing and providing all necessary consumables and spares etc . complete as required as per special conditions of the contract and inventory details ( prefilters , post filters and membarane as required for water purifiers shall be provided by aai ) , 1 . 5 / 2 tr single phase split type / inverter split type / cassette type ac units . note: out of 68 nos . , 42 nos . ac units are installed in the year of 2020 . these 42 nos . ac units are under guarantee period / defects liability period up to 31 . 08 . 2021 . these 42 nos ac units will be handed over w . e . f . 01 . 09 . 2021 . payment shall not be made up to 31 . 08 . 2021 for 42 nos . ac units . , 3tr / 4 tr three phase split type / inverter split type / cassette type ac units / vertical split type ac units . note: out of 24 nos . , 11 nos . ac units are installed in the year of 2020 . these 11 nos . ac units are under guarantee period / defects liability period up to 31 . 08 . 2021 . these 11 nos ac units will be handed over w . e . f . 01 . 09 . 2021 . payment shall not be made up to 31 . 08 . 2021 for 11 nos . ac units . , 40 lph capacity ( make & model: blue star sdlx 480 ) , 80 ltrs storage type single phase water cooler cum dispenser , 125 lph capacity ( make & model:conway d 125 whc ) warm ( 30 ltrs ) , cold ( 40 ltrs ) , hot ( 05 ltrs ) water storage type single phase water cooler cum dispenser . note: 15 nos . above water cooler cum dispenser units are installed in the year of 2020 . these 15 nos . units are under guarantee period / defects liability period up to 31 . 08 . 2021 . these 15 nos . units will be handed over w . e . f . 01 . 09 . 2021 . payment shall not be made up to 31 . 08 . 2021 for 15 nos . units . , 25 lph capacity , ro+ uv based water purifier which is inbuilt with the above model conway d 125 whc water cooler cum dispenser including replacement of all departmentally provided pre & post filters , membarane once in a year . note: 15 nos . above water purifiers units are installed in the year of 2020 . these 15 nos . units are under guarantee period / defects liability period up to 31 . 08 . 2021 . these 15 nos . units will be handed over w . e . f . 01 . 09 . 2021 . payment shall not be made up to 31 . 08 . 2021 for 15 nos . units . , 20 lph and 8 ltr storage capacity , wall mounted ro+ uv based water purifier ( kent grand+ ) i including replacement of all departmentally provided pre & post filters , membarane once in a year . , supply of water purifier filters suitable for 25 lph capacity , ro+ uv based water purifier which is inbuilt with the above model conway d 125 whc water cooler cum dispenser . , 10 spun candle filter , 10 carbon block , membrane , sediment filter , post carbon , supply of water purifier filters suitable for 20 lph and 8 ltr storage capacity , wall mounted ro+ uv based water purifier ( kent grand+ ) , ro , frt filter , sediment filter , carbon filter , transinstallation of split type / inverter split type / cassette type ac units including manpower , transport , testing and commissioning etc . , complete as required . , upto 2 tr , upto 3tr / 4tr , refilling suitable refrigerant gas including leak testing with nitrogen gas , testing and commissioning during transinstallation of ac units etc . , complete as required . , supply and installation of additional refrigerant copper suction and discharge pipes of suitable size along with foam heat insulated tube wrapped with tape etc complete as required . , upto 2 tr , upto 3tr / 4tr , providing and fixing of suitable size foam heat insulated tube wrapped with tape for protection for both copper suction and discharge pipe for the following rating air conditioner etc . , as required . , upto 2 tr , upto 3tr / 4tr , providing and fixing of 25 mm cpvc drain pipe for split type / inverter split type / cassette type ac units with necessary saddles complete etc . as requried .