servicing of air condition machines installed at mayurakshi bhawan & scada building at massanjore, mcc combined office building, rest shed at suri (i) colony and scada building at tilpara barrage, during the year 2025-26.- 1 comprehensive annual maintenance and servicing of air conditioning machine of following ratings. 2 i) 1.0 ton split type 3 ii) 1.5 ton split & cassette type both. 4 iii) 2.0 ton split & cassette type both 5 gas charging (r410a/eco friendly green gas) of window/split air conditioning unit including flushing of cooling & condensing units with nitrogen gas & rectification of leakage, replacement of filter, flair nut etc. if any. 6 i) 1.5 tr. 7 ii) 2.0 tr. 8 providing & fixing of isi marked (is : 15778 - 2007) rigid cpvc drain water piping 6 kg/ cm2 with fittings like elbow, socket, tee etc& support with ms hanger on ceiling or recessed in wall with chasing & plastering with 6 mm thick closed cell elastomeric nitrile rubber insulation complete in all respect, 20mm dia. 9 supply, installation, testing & commissioning of suction/discharge copper pipe line in split air conditioning unit 1.0/1.5 tr/2 tr/3 tr capacity including brazing, nitrile rubber insulation 6/9mm thick class o, etc complete as required, copper tube 3/8.