REPAIR/MAINTENANCE OF CENTRAL AC PLANT AND CONNECTED ITEMS AT MRSAM UNDER GE NASIRABAD

M&L for maintenance of complete Central AC chiller plant of capacity 4 x 32 TR strictly through OEM (i.e. M/S Carrier) (DWAPs No. NSB-AM-GEM-01371) for the plant and equipment.. The scope of work is as under:- Checking the functioning of chiller unit/Air handling unit/Pumps/Cooling tower/Controls and such equipment covered under the contract. Checking the compressor for its proper working. Annual pumping down and restarting as & when required. Checking the microprocessor control panel, control boards, transducers of packaged chillers/condensing unit for their correctness. Replacing of parts due to normal wear & tear.Checking the refrigeration system, motor arıd starters and ensuring healthy condition of the plant. Checking the system for any leaks and rectification of leaks found Taking set of readings and evaluating to ensure satisfactory performance of the plant, Checking the Refrigeration control system for operation and adjusting the settings, Checking the functioning of compressors and its accessories, Cleaning and dust fre ac plant room by vacuume cleaner, Lubricating the bearings of motors, & fans when found necessary, inspection of belts adjusting the tension and replacing the worm out belt as and when found required, Replenishment of refrigeration gas as a result of wear and tear or any other means, Overhauling the components of the equipment at site or in service station as and when required. Checking of the microprocessors PCBs and sensors of IDU/ODU units for its proper functioning and repair/ replacement of the same if found necessary to make the overall system serviceable. Notes:- (i) Spare parts required for repair/ rectification of defects shall be mesured and paid saperatly under respactive items here in after. (ii) Contractor will ensure proper functioning of All AC plants at all workig days times and maintain the adequte temperature. (iii) Petty small parts required for repair i.e. nuts, bolts, washers screws, saddles, grease, oil/ lubricants etc shall be provided by the contractor without any extra cost to the government.

M&L for servicing of electric control panel of AHU /ac plant by cleaning the panel with blower, checking of electric circuits/connections, replacement of unsv burnt wire, cables with existing size & length including proper numbering, replacement of u/s fuse link, lugs, washer, nuts, bolts, checking proper electrical connection, connectivity etc. & find out defective parts and making the panel functional by replacing the unsv item complete all as specified and directed by Engr-in-charge. Note:(i) Unserviceable parts as MCB, MCCB, contactor, relay etc. will be measure and paid separately under relevant item of Sch A as s supply only. (ii) Minor parts like thimbles, tags, nut, bolts, washers etc shall be deemed to be included in quoted rate.

M&L for taking down existing wiring & S&F for re-wiring of existing of Main Electric Panel board/Control panel board of Central/Package type AC Plant with replacement of wiring cable with existing size, & length including proper numbering, replacement of fuse link, lugs, washer, nuts, bolts, checking proper electrical connection, connectivity etc. & find out defective parts and making the panel functional by re-wiring, complete all as specified and directed by Engr-in-charge. Note: (i) Unserviceable parts as MCB, MCCB, contactor, relay, MPD, etc. will be measure and paid separately. (ii) Minor parts like thimbles, tags, nut, bolts, washers etc shall be deemed to be included in quoted rate.

M & L for Descaling the condenser by descaling compound / hydrochloric acid by soaking method,disconnecting condensor from the system by taking out nuts, bolts, studs, valves and MS/GI pipe line from both side cover, cleaning each tube with nylon brush,flushing with alkaline solution,connecting back both side cover including replacingleather gasket 4 mm thick for following capacities of condensers suitable for AC Plant installed as indicated below complete all as specified and directed and all as per manufacturers instruction and to the entire satisfaction of Engineer-in-charge. (a) chiller unit cap 4 x 32 TR

M&L for vacuumization & leakage test of a unit with pressure testing with dry nitrogen to a pressure upto 1.5 times of operating pressure & find the detection of leak and vacuumization by a rotary vacuum pump to reomve the moisture and gases & Hold the Vacuume for 24 hours.complete all as specified and directed.

Ditto above but 2000 to 5000 CFM

Ditto above but 1250 CFM

M&L for charging of Refrigerant R-410 Gas per site requirement in AC Plant of any capacity complete all as specified and directed by Engr-in-Charge. Note: Refrigerant will be charged in compressor after all type of testing like leakage or vacuumizing. Any Leakage/reduction in pressure after charging will be done by contractor and no extra payment will be paid for this leakage refilling.

Supply, fixing & commissioning of Air/water cooled chiller controlled PCB with display unit PCB complete set for water cooled AC plant of Capacity 4 x 32 TR Carrier model as per sample complete all as specified and directed by Engr-in Charge.