Essential work for AC units for various TE Bldg/different sites under divison Lodhi Road MTNL, New Delhi.

Amount

Providing and installing following size soft/hard copper pipe including cutting, bending, jointing, brazing etc as reqd. for hot and liquid refrigerant line complete as required as per site requirement. a) 7/8"

Providing & making drain arrangement for AC units with following pipe i/c Tee, Union, Socket & Elbow etc as required. a) 25 mm dia medium class PVC pipe.

b) 40 mm dia medium class PVC pipe.

Pressure testing with nitrogen, pressure standing for at least 8 hr., vaccumzing & commissioning with appropriate refrigerant for following A C units complete as reqd. a) 4.0 TR / 5.0 TR / 5.5 TR (nominal capacity) AC unit.

b) 7.5 TR / 8.5 TR / 8.75 TR / 9 TR (nominal capacity) AC unit (each Circuit).

c) 11.0 TR / 12 TR (nominal capacity) AC unit (each Circuit).

Supplying, laying and fixing of following sizes pvc sheathed copper conductor armoured / unarmoured cable on the existing wall / ceiling for power / control cable etc making connections and testing etc complete as reqd as per site location. (Make: Havells/ KEI/ Polycab) a) 4 x 6 Sq. mm copper armoured cable.

b) 4 x 1.5 Sq.mm copper armoured cable.

c) 3 core 2.5 Sq.mm flexible copper cable.

Providing and fixing of 6mm thick cross linked polyethylene insulation for drain / copper piping in order to protect it from air borne impurities complete as reqd. as per site location.

Providing and making MS structure work such as MS platform / duct supports / tray supports / frame for indoor and outdoor AC units i/c cutting, welding, painting with redoxide and then enamel oil paint of approved color etc. complete as reqd. as per site location.

Pdg & fixing of GI sheet metal ducting for air supply, mixing air distribution, complete with following thickness (guage) i/c nut bolts, gaskets, suspenders, supports, etc as reqd a) 24 guage GI sheet

Supplying and fixing following new condenser coils including dismantling the existing condensor coil and making proper size copper pipe connection, brazing at joints etc as reqd. a) Condenser coil for 4 TR / 5 TR / 5.5 TR (nominal capacity) AC unit.

b) Condenser coil for 7.5 TR / 8.5 TR / 8.75 TR / 9 TR (nominal capacity) AC unit.

Shifting including dismantling of following AC units (indoor and outdoor unit) including its electrical /mechanical connection,old GI duct/insulation (if any), drain pipes, copper piping, cabling, cable tray, loading and unloading with the help of heavy labour & chain pulley block, transporting the AC unit to the desired location complete as per the instruction of Engineer-in-charge. a) 7.5 TR / 8.5 TR / 8.75 TR / 9 TR / 11 TR (nominal capacity) AC unit.

b) 1.5 TR / 2 TR / 2.5 TR AC units.

Supplying and fixing new evaporator coils for following AC unit including dismantling the faulty existing evaporator coil and making proper size copper pipe connection, brazing at joints etc as reqd. a) Evaporator coil for 7.5 TR / 8.5 TR / 8.75 TR / 9 TR (nominal capacity) AC unit.

b) Evaporator coil for 4 TR /5TR /5.5 TR (nominal capacity) AC unit.

Providing and charging of R-22 gas for top up of refrigerant in the AC units complete as required.

AC Guard CP-Corrosion, prevention coating for brazing joints, U bend, interconnecting copper piping of outdoor and indoor units.

Less credit for dismantled material and dismantled material shall be the property of contractor.

M/s Merco Airconditioning Refrigeration Engineers