Essential work of AC units installed at various T.E Bldgs/RSUs/various sites under MTNL, New Delhi

Amount

Supply & installation of following nominal sizes of soft drawn/hard drawn copper refrigerant piping for air-conditioning system, complete with fittings, with suitable supports, jointing/brazing including all accessories and dismantling of defective copper pipe and deposit the defective material to desired location in same building as per specifications etc. as required. a) 6.35mm dia (OD)

b) 9.53mm dia (OD)

c) 12.7mm dia (OD)

d) 15.86mm dia (OD)

e) 22.2mm dia (OD)

Supplying and fixing of PVC insulated PVC sheathed/XLPE insulated copper conductor cables of 1.1KV grade of following sizes on the existing M.S. trays/walls with saddles, screws etc and end terminations of cables with glands etc. as required. a) 4 x 6 Sq. mm copper armoured cable

b) 4 x 1.5 Sq.mm copper conductor flexible cable

c) 18C x 2.5 Sq.mm copper armoured cable

Fabricating & installing of following size cable-tray, width-size above 250mm to 500mm, made out with M.S. Slotted angle & square pipe/factory fabricated MS perforated cable tray i/c nut bolt, screw, M.S. / GI threaded suspenders, fasteners etc. as reqd.

Dismantling of old 5.5TR/7.5TR Ductable AC unit outdoor unit and its electrical connections , cabling, MS Frame, copper piping etc including lifting of units from one location in the building and shifting them to desired location within the building decided by engineer-in-charge complete as required.

Supplying, Laying & fixing of 8 SWG GI earthing wire on the existing surface/recess for loop earthing with main power cable complete as required.

Providing and fabricating MS structure work/ MS platform/duct supports/40x40x5mm angle iron/steel wire-mesh etc. as per site requirement i/n cutting, welding, painting with redoxide and then 2 coats of enamel oil paint of approved color etc. complete as reqd.

Supply and charging R-22/R-410A/R-407C refrigerant for top-up of refrigerant in the AC units complete as required.

Leakage testing & repairing of leaks with the help of brazing set followed by pressure testing of complete circuit with nitrogen gas, flushing of whole circuit, vacuumizing and commissioning of 5.5TR/7.5TR/11TR Ductable/Package AC unit complete as required.

Providing and fixing of 9mm thick cross linked polyethylene insulation for copper piping in order to protect it from air borne impurities complete as reqd. as per site location.

Dismantling of old 7.5TR/8.5TR/10TR/11TR Ductable AC/ Package AC unit including indoor and outdoor unit, i/n its electrical connections , cabling etc.and lifting & shifting the old material on the same floor as decided by engineer-in-charge complete as required.

Dismantling of Old dampers and lifting and shifting the dampers from 5th Floor to the lower basement in same building as decided by the engineer-in-charge complete as required.

Dismantling of old ducting including Aluminium cladding and lifting & shifting the material from 5th Floor to the lower basement in same building as decided by the engineer-in-charge complete as required (each unit)

Dismantling of old defective condenser coil with the help of brazing set and replacement with new 5.0TR/5.5TR condenser coil for existing Package AC/Ductable AC unit and deposit the defective coil in the store of same building complete as required.

Dismantling of old defective condenser coil with the help of brazing set and replacement with new 7.5TR/8.5TR condenser coil for existing Package AC/Ductable AC unit and deposit the defective coil in the store of same building complete as required.

Dismantling of old defective evaporator coil with the help of brazing set and replacement with new 7.5TR/8.5TR evaporator coil for existing Package AC/Ductable AC unit and deposit the defective coil in the store of same building complete as required.

Dismantling of old defective evaporator coil with the help of brazing set and replacement with new 10TR/11TR evaporator coil for existing Package AC/Ductable AC unit and deposit the defective coil in the store of same building complete as required.

Dismantling of old defective evaporator coil with the help of brazing set and replacement with new 16.5TR/17TR evaporator coil for existing Package AC/Ductable AC unit and deposit the defective coil in the store of same building complete as required.

Lifting of Indoor and Outdoor units of 10TR/11TR ductable AC/ Package AC from one location in the building and Shifting it to the desired location on desired floor in the same building complete as required.

Installation of IDU & ODUs of package AC on existing Foundation/MS Stand including old ducting connection piece, fixing of old damper & fixing of old flexible canvas connection complete as required.

M/s Merco Airconditioning Refrigeration Engineers