REPAIR / MAINT OF CENTRAL AC PLANTS IN THE AREA OF AGE E/M EXT (W/S) UNDER GE (E/M) LUCKNOW.

Descaling of condenser unit of 12.5 TR Central AC Plant, including condenser water circuit, cooling tower and connected condenser-water piping, by circulation/application of approved inhibited descaling chemical suitable for the material of construction of the condenser and associated water circuit, using suitable pump, nylon/soft brushes and other necessary tools and equipment; including opening and refixing of covers, removal of loosened scale/deposits, flushing with clean water, neutralisation wherever required, restoration of the system, leak testing and putting the plant back into satisfactory operation complete.

Descaling of condenser unit of 75 TR Central AC Plant, including condenser water circuit, cooling tower and connected condenser-water piping, by circulation/application of approved inhibited descaling chemical suitable for the material of construction of the condenser and associated water circuit, using suitable pump, nylon/soft brushes and other necessary tools and equipment; including opening and refixing of covers, removal of loosened scale/deposits, flushing with clean water, neutralisation wherever required, restoration of the system, leak testing and putting the plant back into satisfactory operation complete.

Servicing and cleaning of AHU of any capacity and type, including dismantling of the front access panel/portion as necessary; cleaning of cooling coil, blower/fan assembly, drain tray, filters, casing and accessible internal surfaces by compressed air and/or suitable low-pressure water jet; cleaning of cooling coil using approved non-corrosive coil-cleaning chemical suitable for the material of construction, followed by thorough washing with clean water; cleaning of condensate drain tray and drain line; removal of dust, dirt, scale and other deposits; tightening of accessible electrical/mechanical connections and fasteners; and thereafter reassembling, refixing, testing and commissioning the AHU for satisfactory operation complete.

Servicing and cleaning of ceiling-suspended AHU of any capacity and type, including provision of all necessary access arrangements; isolation of the AHU; dismantling and taking down of accessible panels, covers and other components as necessary for servicing; cleaning of cooling coil, blower/fan assembly, filters, drain tray, casing and accessible internal surfaces using compressed air and/or controlled-pressure water jet; cleaning of cooling coil using approved non-corrosive coil-cleaning chemical suitable for the material of construction, followed by thorough washing with clean water; cleaning and flushing of condensate drain tray and drain line; removal of dust, dirt, scale and other deposits; cleaning of associated air grilles/ louvers, where provided; tightening of accessible mechanical and electrical connections and fasteners; reassembly and refixing of all dismantled components; and testing and commissioning of the AHU for satisfactory operation complete.

Cleaning of storage water tank(s) of cooling tower/chiller/ condenser water system of any capacity and type, including removal of sludge, scale, dirt, algae and other deposits; cleaning by suitable detergent/ approved cleaning agent and fresh water; scrubbing of internal surfaces, as necessary; flushing and complete removal of accumulated waste/deposits; and disposal of waste/sludge at an approved location complete.

Dismantling and taking out the existing unserviceable auxiliary contact block and supplying, fixing and connecting a new auxiliary contact block, with NO and NC contacts in the configuration required for the existing contactor/control circuit, compatible with the existing contactor and suitable for its rated control voltage, including all necessary electrical connections, mounting accessories, testing and commissioning complete.

Dismantling and taking out the existing unserviceable MCB and supplying, fixing and connecting a new MCB, 4-pole, 415 V AC, 50 Hz, 40 to 63 A, having minimum short-circuit breaking capacity of 10 kA, C-curve characteristic, conforming to IEC 60898-1 with required copper lugs complete.

M&L for pressure leak testing of the complete refrigerant circuit of 12.5 TR AC compressor system, including compressor, condenser, evaporator/chiller unit and connected refrigerant piping, by charging dry nitrogen to the test pressure recommended by the OEM and appropriate for the system, including isolation of components as necessary, identification of leakage points, holding the test pressure for the specified period, attending to and rectifying leakage where practicable, re-testing after rectification, controlled release and removal of residual nitrogen, and restoration of the system to normal operating condition, complete. Note - 1. All T&P, including suitable nitrogen cylinder, pressure regulator, manifold/gauges, hoses, leak-detection equipment and other tools/equipment required for pressure testing, as well as nitrogen gas, shall be deemed included in the rate of this item. 2. Major replacement components/materials required for rectification of leakage, such as replacement coils, major sections of refrigerant piping, valves, compressor components or other major spare parts, shall not be included in this item and shall be measured and paid for separately under the relevant item of schedule, wherever provided.

Dismantling and taking out the existing unserviceable power contactor and supplying, fixing and connecting a new 3-pole power contactor, rated for 415 V AC, 3-phase, 50 Hz supply, with 220/230 V AC, 50 Hz coil and auxiliary contacts as required for the existing control circuit, conforming to the applicable requirements of IEC 60947-4-1, including all necessary electrical connections, minor accessories, testing and commissioning complete for the following operational current under AC-3 duty:- (a) 10 A

(b) 12 A to 18 A