REPAIR/ MAINT OF CENTRAL AC PLANTS / PACKAGE TYPE AC PLANTS INCLUDING MAINTENANCE BY OEM AT AF STN NAL

Amount

Comprehensive maintenance of Central Air Conditioning (AC) Plant comprising 2 Nos × 36 TR = 72 TR capacity (in operation) and 1 No × 36 TR = 36 TR capacity (standby), water-cooled type with scroll compressor, microprocessor-based control panel, and chilled water system, installed at BASE OPS, by carrying out the following tasks as per OEM recommendations and as directed by the Engineer-in-Charge (EIC): Scope of Work (per unit): 1. Routine and breakdown maintenance of the plant by trained HVAC technician/mechanic, with visits by OEM representative as and when required during the contract period. 2. Ensuring serviceability of the system within 24 hours in case of major breakdown/fault, using all required tools, plant and equipment (T&P) including brazing equipment, electrical testing instruments, refrigerant gas charging kit, etc. 3. Checking, calibration and resetting of microprocessor-based control panel, including input/output temperature settings, error code rectification, and restoration to design parameters. 4. Inspection and servicing of the following components: (a) Electrical/control wiring and terminations (b) Water flow switch, HP/LP pressure switches (c) Refrigerant gas pressure and compressor oil level (d) Compressor operation and performance (e) Chiller and condenser unit functioning as per design conditions 5. Refrigerant gas top-up (as required) including leak testing, vacuuming, charging using standard procedures and provision of necessary tools. (Note: Cost of new refrigerant gas shall be measured and paid separately under relevant item of Sch ‘A’.) 6. Replacement of defective parts (as per OEM standard), dismantling and re-fixing of serviceable components, etc. (Note: New spare parts shall be measured and paid separately under respective item of Sch ‘A’.) 7. Ensuring proper functioning of all system parameters for achieving desired comfort conditions in the conditioned space.

All as per Item No. 01 here-in-before but for Chiller AC Plant of 2 Nos × 25 TR = 50 TR capacity (in operation) and 1 No × 25 TR = 25 TR capacity (standby), installed at WWR (WSA–III), complete all as specified and directed.

All as per Item No. 01 here-in-before but for Chiller AC Plant of 2 Nos × 37.5 TR = 75 TR capacity (in operation) and 1 No × 37.5 TR = 37.5 TR capacity (standby), installed at Station Auditorium, complete all as specified and directed.

All as per Item No. 01 here-in-before but for Chiller AC Plant of 2 Nos × 37.5 TR = 75 TR capacity (in operation) and 1 No × 37.5 TR = 37.5 TR capacity (standby), installed at Bomb Dump (WSA–II), complete all as specified and directed.

All as per Item No. 01 here-in-before but for Chiller AC Plant of 2 Nos × 75 TR = 150 TR capacity (in operation) and 1 No × 75 TR = 75 TR capacity (standby), installed at New Tech Flight Hangar, complete all as specified and directed.

All as per Item No. 01 here-in-before but for Chiller AC Plant of 2 Nos × 12.5 TR = 25 TR capacity (in operation) and 1 No × 12.5 TR = 25 TR capacity (standby), installed at Transmitter, complete all as specified and directed.

All as per Item No. 01 here-in-before but for Chiller AC Plant of 3 Nos × 12.5 TR = 37.5 TR capacity (in operation) and 1 No × 12.5 TR = 12.5 TR capacity (standby), installed at SEW-I, complete all as specified and directed.

All as per Item No. 01 here-in-before but for Chiller AC Plant of 2 Nos × 25 TR = 50 TR capacity (in operation) and 1 No × 25 TR = 25 TR capacity (standby), installed at Signal Section, complete all as specified and directed.

All as per Item No. 01 here-in-before but for Chiller AC Plant of 2 Nos × 11 TR = 22 TR capacity (in operation) and 1 No × 11 TR = 11 TR capacity (standby), installed at GCA, complete all as specified and directed.

All as per Item No. 01 here-in-before but for Chiller AC Plant of 3 Nos × 5 TR = 15 TR capacity (in operation) and 1 No × 5 TR = 5 TR capacity (standby), installed at OTIS, complete all as specified and directed.

All as per Item No. 01 here-in-before but for Chiller AC Plant of 2 Nos × 7.5 TR = 15 TR capacity (in operation) and 1 No × 7.5 TR = 7.5 TR capacity (standby), Package type, installed at SEW-II Bldg, complete all as specified and directed.

Material and labour for descaling and cleaning of tubes of condenser (heat exchanger) unit of Central Air Conditioning (AC) Plant comprising 2 Nos × 36 TR = 72 TR capacity (in operation) and 1 No × 36 TR = 36 TR capacity (standby), installed at BASE OPS, including the following operations all as specified and directed by the Engineer-in-Charge (EIC): 1. Opening of condenser heads and removal of end covers carefully. 2. Cleaning and descaling of shell and tube type condenser unit using approved descaling solution, proper drill rods, wire brushes, and high-pressure water circulation pumps until all scale, dirt, and deposits are completely removed without damaging CU tube. 3. Thorough internal flushing and inspection to ensure free water flow through all tubes. 4. Replacement of packing gaskets, nuts, bolts, and washers at both ends of the condenser. 5. Re-fixing of condenser heads in original position after cleaning and testing for leakage and satisfactory performance. Note: (a) The work shall be carried out by skilled HVAC technician(s) using appropriate tools and safety measures. (b) The descaling solution and consumables shall be of approved make and concentration as recommended by the OEM. (c) All tools, materials, and consumables required for completion of the work shall be deemed included in the unit rate. Complete all as specified and directed by the Engineer-in-Charge.

All as per Item no 02 here in before but Chiller AC plant 2 x 24/25= 48/50 TR capacity (in working) & 1 x 24/25= 24 TR capacity (as stand by) installed at WWR (WSA -III) complete all as specified and directed.

All as per Item no 02 here in before but Chiller AC plant 2 X 37.5 = 75 TR capacity (in working) & 1 x 37.5 = 37.5 TR capacity (as stand by) installed at STATION AUDITORIUM complete all as specified and directed.

All as per Item no 02 here in before but Chiller AC plant 2 X 37.5 = 75 TR capacity (in working) & 1 x 37.5 = 37.5 TR capacity (as stand by) installed at (WSA - II) complete all as specified and directed.

All as per Item no 02 here in before but Chiller AC plant 2 X 75 = 150 TR capacity (in working) & 1 x 75 = 75 TR capacity (as stand by) installed at VTF complete all as specified and directed.

All as per Item no 02 here in before but Chiller AC plant 2 x 12.5 TR = 25 TR capacity (in working) & 1 x 12.5= 12.5 TR capacity (as stand by) installed at TRANSMITTER complete all as specified and directed.

All as per Item no 02 here in before but Chiller AC plant 3 x 12.5 TR = 37.5 TR capacity (in working) & 1 x 12.5= 12.5 TR capacity (as stand by) installed at SEW-I complete all as specified and directed.

All as per Item no 02 here in before but Chiller AC plant 2 X 24/25 = 50 TR capacity (in working) & 1 x 24/25 = 25 TR capacity (as stand by) installed at Signal section complete all as specified and directed.

All as per Item no 02 here in before but Chiller AC plant 2 X 11 = 22 TR capacity (in working) & 1 x 11 = 11 TR capacity (as stand by) installed at GCA complete all as specified and directed.

Material and labour for repairing and servicing of FRP Cooling Tower of 75 TR capacity serving Central Type Air Conditioning Plant, including the following operations, complete all as specified and directed by the Engineer-in-Charge (EIC): 1. Dismantling of cooling tower components for removal of top cover, PVC fills, nozzles, and PVC louvers for thorough cleaning. 2. Cleaning of PVC fills, choked nozzles, and louvers to remove dirt, scale, and biological deposits using water and suitable cleaning agents. 3. Cleaning of bottom tank/sump to remove accumulated dust, mud, and sand. 4. Replacement of rusted nuts, bolts, and washers with new ones of appropriate size and grade. 5. Checking the alignment, lubrication, and serviceability of the fan motor, including oiling/greasing of bearings. 6. Painting of damaged surfaces and application of epoxy seal paint on interior and exterior parts of the cooling tower as per manufacturer’s specifications. 7. Reassembling all parts after servicing and testing the unit for proper operation and water flow. Note: (a) All tools, consumables, and labour required for the above work shall be deemed included in the unit rate. (b) Any major spare parts such as fan blade, motor, gearbox, PVC fills, louvers, or nozzles, if required, shall be measured and paid separately under the respective “Supply Only” items of Sch ‘A’. Complete all as specified and directed by the Engineer-in-Charge.

All as per item No 03 here in before but Cooling tower of capacity 50 TR complete all as specified and directed

All as per item No 03 here in before but Cooling tower of capacity 20/30 TR complete all as specified and directed

All as per item No 03 here in before but Cooling tower of capacity 10/15TR complete all as specified and directed

M& L for dismentling / opening air filter ,nuts bolts,tray for AHU general servicing including cleaning of cooling coil from both sides with coil cleaning solution and brushing suitable for AHU, correcting tension in belts, checking and correcting allignment of shaft pulley of motor, cleaning primary & secondary filter, blower complete of capacity 5500 to 10000 CFM AHU including cleaning of bottom tray and painting inside the tray with one coat of marine anti-corrosive paint over a coat of red oxide primer all as specified and directed by Engr-in-Charge. Note:- Others major spare parts shall be measured separetely as under respective item of " Sch A" as Supply only .

All as per item No 4 here-in-before but for AHU of capacity 19000FM to 25000CFM complete all as specified and directed.

Material and labour for dismantling/opening of Air Handling Unit (AHU) for general servicing of capacity 10500 CFM to 15000 CFM, including the following operations, complete all as specified and directed by the Engineer-in-Charge (EIC): 1. Opening of air filters, nuts, bolts, and drain tray carefully for inspection and servicing. 2. Cleaning of cooling coils from both sides using approved coil cleaning solution and soft brushing suitable for AHU fins. 3. Checking and correcting belt tension and alignment of motor shaft and pulley. 4. Cleaning of primary and secondary filters and blower assembly thoroughly to remove dust and debris. 5. Cleaning of bottom drain tray, removal of sludge or algae deposits, and painting inside the tray with one coat of marine-grade anti-corrosive paint over a coat of red oxide primer. 6. Reassembly of all components and operational testing of the AHU for satisfactory performance. Note: (a) All labour, tools, cleaning materials, and consumables required to carry out the above work shall be deemed included in the unit rate. (b) Any major spare parts such as fan motor, blower wheel, bearings, belt, pulley, filters, etc., if required, shall be measured and paid separately under the respective “Supply Only” items of Sch ‘A’.Complete all as specified and directed by the Engineer-in-Charge.

Material and labour for servicing and repairing of electrically operated Hot Water Generator of capacity 36–54 kW, complete with automatic and safety control system, including the following operations, all as specified and directed by the Engineer-in-Charge (EIC): 1. Checking and servicing of all automatic and safety controls such as safety valve, purge valve, high-limit cut-out, automatic and manual reset controls, low-level cut-out stop controller, and thermostat. 2. Inspection and testing of heating elements, wiring connections, contactors, and control panel for proper functioning. 3. Cleaning of the heating chamber and associated piping to ensure efficient heat transfer. 4. Replacement of defective or unserviceable parts such as thermostats, relays, heaters, contactors, valves, or sensors as required for restoring full functionality. 5. Testing and commissioning of the hot water generator after completion of servicing and repairs to ensure safe and efficient operation. Note: (a) All labour, tools, testing instruments, and consumables required for the above work shall be deemed included in the unit rate. (b) Any major spare parts such as heating elements, control panel components, valves, or thermostats, if required, shall be measured and paid separately under the respective “Supply Only” items of Sch ‘A’. Complete all as specified and directed by the Engineer-in-Charge.

Supply only the following items for Central AC Plants mentioned hereinbefore, to be fixed under Item Serial Nos. 01 to 06, complete all as specified and directed by the Engineer-in-Charge.

Water flow switch of model HFS -25 or as per existing sample

LP/HP control switch as per sample

Filter drier for existing make and size

Safty Valve for condensor 350 PSI to 550 PSI.

Thermostatic expansion valve for 11/12.5TR unit of AC Plant.

Thermostatic expansion valve for 24/25 TR unit of AC Plant.

Thermostatic expansion valve for 36/37.5TR unit of AC Plant.

Thermostatic expansion valve for 75TR unit of AC Plant.

Air damper for AHU duct as per existing sample.

Copper tube thermostat probe of suitable size with sensor

Freon gas pressure gauge of 4''dial, 0 to 14 kgs rating

Temperature gauge (Thermometer) suitable for measuring range 0 - 50 degree C.

V fan belt for Blower motor of various capacities, as per OEM

Refrigerant gas (R-407C )

Voltage Protection Device (VPD) suitable for 75TR Unit of AC plant

Voltage Protection Device (VPD) suitable for 36/37.5 TR Unit of AC plant

Voltage Protection Device (VPD) suitable for 12.5TR/25TR Unit of AC plant

Motor Protection Device (VPD) suitable for 75TR Unit of AC plant

Motor Protection Device (VPD) suitable for 36/37.5 TR Unit of AC plant

Motor Protection Device (VPD) suitable for 12.5TR/25TR Unit of AC plant

Chiller sensor suitable for Bluestar/ VOLTAS chiller unit Model no. XWCS3039AR2/XWC3S039AR2/ WCDS037DPMN3X1 of 37.5 TR Unit of AC plant .

Chiller sensor suitable for Voltas chiller unit Model no. ACWCD5078DPMN3X2 of 75 TR Unit of AC plant.

Chiller sensor suitable for voltas chiller/blue star unit Model no. ACWCD5013DPMN1X1P or existing model of 11/12.5 TR Unit of AC plant.

Chiller sensor suitable for Blue star chiller unit Model no. XWCS3S025AR2 or existing model of 24/25 TR Unit of AC plant, complete all as specified and as directed.

New superior quality canvas including stitching as per existing at site with inspection strip

PVC nozzle of size 2 to 3 inch suitable for fixing in cooling tower

PVC filling blocks of size 600mmx300mmx150mm.

Eliminator FRP

Cooling tower fan blade assembly for 1.5/2 HP CT motor.

FRP Compound

Strip Heater of capacity 2/3 KW

Immersion Heater of capacity 3/4 KW

Immersion Heater of capacity 5/6 KW

Display unit with sensor including control accessories for hot water generator of capacity 54KW with facility auto on/off at set temperature

Pre filter 10 micron of size 600mm x 600mmx 50mm made of out of GI wire mesh interspaced with two crimp layers and three flat layers flanged deep box type and efficiency 90% as per existing size and pattern suitable for AC Plant air handling unit

Pre filter 10 micron of size 600mm x 300mmx 50mm made of out of GI wire mesh interspaced with two crimp layers and three flat layers flanged deep box type and efficiency 90% as per existing size and pattern suitable for AC Plant air handling unit

All as per item No 8 here-in-before but for Capacity of 36/37.5TR unit of AC Plant

All as per item No 8 here-in-before but for Capacity of 24/25TR unit of AC Plant.

All as per item No 8 here-in-before but for Capacity of 11/12.5TR unit of AC Plant

All as per item No 8 here-in-before but for Capacity of 5/7.5TR unit of AC Plant

Material and labour for disconnecting from mains and taking out existing unserviceable/defective electric motor of capacity 2 HP to 3 HP, of any type and make, including the following operations, complete all as specified and directed by the Engineer-in-Charge (EIC): 1. Disconnecting all electrical connections and removing the motor from its foundation/base frame. 2. Transporting the motor to the repair workshop for necessary repairs. 3. Dismantling the motor and removing burnt-out windings completely along with old insulating materials. 4. Rewinding the stator with super-enamelled copper wire of existing gauge and number of turns, as per OEM specifications. 5. Applying Class ‘F’ insulation varnish, baking/drying in an oven, and reassembling the motor with proper alignment. 6. Transporting back to site, reinstalling on the foundation, reconnecting all electrical connections, and carrying out testing and commissioning to ensure satisfactory performance. Note: (a) The cost of rewinding materials, insulation varnish, and labour shall be deemed included in the unit rate. (b) All work shall be carried out by qualified electricians/motor winders using proper tools, testing instruments, and as per OEM and IS standards. Complete all as specified and directed by the Engineer-in-Charge.

All as per item No 9 here-in-before but for Capacity of 5HP

All as per item No 9 here-in-before but for Capacity of 7.5/ 10HP

All as per item No 9 here-in-before but for Capacity of 15/20HP

All as per item No 9 here-in-before but for Capacity of 25/30HP

All as per item No 10 here-in-before but for Capacity of 7.5/ 10HP

All as per item No 10 here-in-before but for Capacity of 15/20HP

All as per item No 10 here-in-before but for Capacity of 25/30HP

Supply only the following items for the AC Plant Electrical Panel mentioned hereinbefore, to be fixed under Item Serial No. 11, complete all as specified and directed by the Engineer-in-Charge.

HRC fuse link, type HN, Capacity up to 150 Amps complete all as specified and as directed.

Power contactor, 40 Amps triple pole(TP), AC 3 duty complete all as specified and as directed.

Power contactor, 32 Amps triple pole(TP), AC 3 duty complete all as specified and as directed.

Power contactor, 25 Amps triple pole(TP), AC 3 duty complete all as specified and as directed.

Power contactor, 18 Amps triple pole(TP), AC 3 duty complete all as specified and as directed.

Power contactor, 12 Amps triple pole(TP), AC 3 duty complete all as specified and as directed.

Auxillary contactor (2 NO+2NC), suitable for 12-40 Amps power contactors, complete all as specified and as directed.

Three phase Over load thermal relay direct mounting type, relay range 4.5- 7.5 Amps, including necessary wiring, thimbles etc.

Three phase Over load thermal relay direct mounting type, relay range 6-10 Amps, including necessary wiring, thimbles etc.

Three phase Over load thermal relay direct mounting type, relay range 9-15 Amps, including necessary wiring, thimbles etc.

Three phase Over load thermal relay direct mounting type, relay range 14-23 Amps, including necessary wiring, thimbles etc.

Three phase Over load thermal relay direct mounting type, relay range 20-33 Amps, including necessary wiring, thimbles etc.

Single phase preventer type VSP2

Star/delta timer range 0-60 seconds, suitable for LT panels.

Push Button Red/ Green.

LED phase indicator Red/ Yellow/ Blue.

Multifunction meter for voltage, current, PF etc measurement

Material and labour for supply and fixing in repair of cast iron butterfly valve, lever operated, SS disc type with nitrile/EPDM rubber lining, PN-16, of size 125 mm dia, complete all as specified and directed by the Engineer-in-Charge.

All as per item No 13 here-in-before but for 100mm dia.

All as per item No 13 here-in-before but for 80mm dia.

All as per item No 13 here-in-before but for 65mm dia.

All as per item No 13 here-in-before but for 50mm dia.

Material and labour for supply and fixing in repairs of cast iron Y-strainer with flanged ends, provided with stainless steel perforated sheet screen, of size 100 mm dia, complete all as specified and directed by the Engineer-in-Charge.

All as per item No 14 here-in-before but for 80 mm dia.

Material and labour for supply and fixing in repairs of cast iron non-return valve (NRV) of size 100 mm dia, pressure class PN-16, including provision of nuts, bolts, washers, gaskets, etc., for central-type AC plants, complete all as specified and directed by the Engineer-in-Charge.

All as per item No 15 here-in-before but for 80 mm dia.

All as per item No 15 here-in-before but for 65 mm dia

Material and labour for providing and fixing electrical insulating rubber mat of size 2.0 m x 1.0 m x 3 mm, tested for LT voltage up to 1100 Volts, complete all as specified and directed by the Engineer-in-Charge.

Material and labour for dismantling and removing old unserviceable duct insulation and providing external thermal insulation to supply and return air ducts laid outside the conditioned space/room with closed-cell Class ‘O’ nitrile rubber elastomeric insulation of 19 mm thickness, having density 40–55 kg/m³, thermal conductivity not exceeding 0.037 W/m·K at 20°C mean temperature, and water vapour permeability (μ) ≥ 7000 (without any additional vapour barrier), factory-laminated with aluminium foil of minimum 60 microns thickness. Insulation shall be applied on ducts using manufacturer’s recommended rubber-based adhesive in a blend of solvents and finally finished with 26-gauge aluminium cladding sheet, complete all as specified and directed by the Engineer-in-Charge.

Material and labour for taking out old unserviceable pipe insulation and providing external thermal insulation to chilled water and hot water pipelines of 100 mm to 125 mm dia with closed-cell Class ‘O’ nitrile rubber elastomeric insulation of 19 mm thickness, having density 40–55 kg/m³, thermal conductivity not exceeding 0.037 W/m·K at 20°C mean temperature, and water vapour permeability (μ) ≥ 7000 (without any additional vapour barrier), factory-laminated with aluminium foil of minimum 60 microns thickness. Insulation shall be applied on MS chilled/hot water pipes using manufacturer’s recommended rubber-based adhesive in a blend of solvents and finally finished with 26-gauge aluminium cladding sheet, complete all as specified and directed by the Engineer-in-Charge.

All as per Item No 18 here-in-before but for 80 mm dia pipe

All as per Item No 18 here-in-before but for 50/65 mm dia pipe

Material and labour for supply, fabrication, assembly, and erection of air-conditioning ducting made of 0.8 mm thick (22 gauge) galvanized iron (GI) sheet, including cutting to required size and shape, patch work, fixing on walls, roof, ceiling, or existing iron framework, and providing all necessary accessories such as corners, cleats, carriage bolts, gaskets, lap joints, welding, riveting, and application of suitable sealant on longitudinal joints, including dismantling and removal of old unserviceable ducting, complete all as specified and directed by the Engineer-in-Charge.

Material and labour for fabrication and erection of framework made of angle iron for structural or frame support, including cutting to required shape, fabrication, welding, drilling holes, notching for wire, and fixing of flat iron fillets (for securing wire mesh, etc.), with all necessary drilling, bolting, riveting, and welding work, conforming to Fe-290, Grade E-165, including taking down and removing old unserviceable framework, complete all as specified and directed by the Engineer-in-Charge.

Material and labour for preparation of surfaces of Central AC Plant of capacity 3 × 75 TR including trap doors, condensers, chillers, compressors, induction motors, pumps, hot water generators, C-channels, all pipelines, valves, outer body of cooling towers, AC plant electrical panels, duct covers/chequered plates, and AHUs, and painting the same with different colours as per approved colour code system and as directed by the Site-in-Charge. The job includes removing old paint by rubbing and brushing, preparing the surface properly, applying one coat of red oxide zinc chromate primer, and finishing with two coats of first-grade synthetic enamel paint, complete all as specified and directed by the Engineer-in-Charge.

All as per item No 21 here-in-before but for Capacity of AC Plant 3x 36/37.5 TR

All as per item No 21 here-in-before but for Capacity of AC Plant 3x 24/25 TR

All as per item No 21 here-in-before but for Capacity of AC Plant 3/4x 11/12 TR

All as per item No 21 here-in-before but for Capacity of Package type AC Plant 3x 5/7.5 TR

All as per item No 22 here-in-before but for 80 mm dia

All as per item No 22 here-in-before but for 100 mm dia

Material and labour for taking out old unserviceable GI pipe and supplying and laying, complete with all fittings, GI tubing of 50 mm dia, medium grade, laid in trenches or on exposed surfaces as required, complete all as specified and directed by the Engineer-in-Charge.

All as per item No 23 here-in-before but for 25 mm dia.

Supply and fixing in repairs of 25 mm dia gun metal globe or gate valve with iron wheel head, screwed both ends for iron pipe, complete all as specified and directed by the Engineer-in-Charge.

Supply and fixing in repairs of Direct-On-Line (DOL) starter suitable for motors of 5 HP to 7.5 HP capacity, complete with suitably rated relay, suitable for mounting on existing LT panels of AC plants, including necessary connections with appropriate size single-core copper conductor wire, complete all as specified and directed by the Engineer-in-Charge.

Supply and fixing in repairs of PCB (Printed Circuit Board) for Central Type AC Plant unit of 75 TR capacity, make Voltas, model No. ACWCD5078DPMN3X2, including necessary connections with the existing control panel of the AC plant, testing and commissioning for satisfactory performance, complete all as specified and directed by the Engineer-in-Charge.

Supply and fixing in repairs of PCB (Printed Circuit Board) for Central Type AC Plant unit of 37.5 TR capacity, make Blue Star / Voltas, model No. XWCS3039AR2 / WCDS037DPMN3X1, including necessary connections with the existing control panel of the AC plant, testing and commissioning for satisfactory performance, complete all as specified and directed by the Engineer-in-Charge.

Supply and fixing in repairs of PCB (Printed Circuit Board) for Central Type AC Plant unit of 12.5 TR capacity, as per OEM, including necessary connections with the existing control panel of the AC plant, testing and commissioning for satisfactory performance, complete all as specified and directed by the Engineer-in-Charge.

Supply and fixing in repairs of PCB (Printed Circuit Board) for outdoor unit of cassette type AC of capacity 3.5 TR to 5.5 TR, suitable for existing AC units of make Blue Star, model No. HNCS48YAFO, rated voltage 415 V, 3-phase, configured with indoor unit operated through remote control, including testing and commissioning for satisfactory performance, complete all as specified and directed by the Engineer-in-Charge.

Supply, installation, testing, and commissioning in repairs of three-way motorised mixing valve of proportional linear modulating type, complete with actuator having manual override facility, proportional thermostat, and necessary wiring using 1.5 sqmm copper conductor multi-core armoured cable. The valve shall be of suitable size as required at site for AHU applications and shall include all associated accessories such as transformer, humidistat (for humidity control), and standalone microcontroller-based LCD proportional temperature controller (for operation of the three-way modulating mixing valve). The system shall be electrically operated and controlled through 230V / 24V Class-2 transformer, complete all as specified and directed by the Engineer-in-Charge.

Supply and fixing in repairs of scroll compressor of 12.5 TR capacity, including charging of refrigerant gas R-407 and testing for satisfactory performance suitable for existing unit, complete all as specified and directed by the Engineer-in-Charge.

Supply and fixing in repair Cooling Tower (CT) fan complete assembly, fan diameter 1200 mm, including connected GI nuts, bolts, and accessories, with all fittings suitable for 75/80 TR capacity cooling tower as per OEM, including testing and commissioning, complete all as specified and as directed by Engineer-in-Charge.

Supply and fixing in repair all corrosion-proof accessories of Cooling Tower (CT) including PVC fills, inlet louvers, drift eliminators, PVC water distribution chamber, self-rotating sprinkler nozzles, GI nuts, bolts, float valve and all necessary fittings, complete all as specified and directed by Engineer-in-Charge. Notes: (a) The spray system shall function satisfactorily even with 50% reduced water flow. (b) The induced draught cooling tower shall operate on the counter-flow principle. (c) Cooling tower specification for PVC filling as per manufacturer’s design and standard practice. (i) Capacity — 75/80 TR (ii) Drift loss — 0.05% (iii) Evaporation loss — 0.75%

Supply and fixing in repair round bottle-type/square-type FRP induced draught cooling tower, fabricated with fibre glass reinforced plastic (FRP) casing and basin, including MS hot-dip galvanized (MSHDG) type mechanical equipment supports, electroplated hardware, drain connections, suitable GI inspection ladder, steel supporting structure, anti-vibration mountings, etc., suitable for Cooling Tower of 75/80 TR capacity, complete as per manufacturer’s design and specifications, including testing and commissioning, all as specified and directed by Engineer-in-Charge.

Material and labour for overhauling and repairing of refrigerant suction/delivery/liquid line valve of any size, including servicing, replacement of packing materials, sealing rings, Teflon washers, and testing for satisfactory performance, complete all as specified and directed by Engineer-in-Charge.

Materials and labour for dismantling and taking down old/unserviceable/rusted supply or return air diffusers, dampers, side grilles, or volume control dampers (VCD) of any size, type, or shape from any location at Central AC Plants, complete all as specified and directed by Engineer-in-Charge.

Materials and labour for supply and fixing of powder-coated extruded aluminium rectangular diffusers of required sizes, complete with black anodized extruded aluminium volume control dampers, nuts, bolts, screws and all necessary fittings, complete all as specified and directed by Engineer-in-Charge. (Make: Dyne Craft / MAPRO / SERVEX)

Materials and labour for supply and fixing of powder-coated extruded aluminium rectangular diffusers of required sizes, without volume control damper, complete with nuts, bolts, screws and all necessary fittings, complete all as specified and directed by Engineer-in-Charge.

Supply and fixing of powder-coated extruded aluminium supply and return air grilles, complete with all fixing accessories such as nuts, bolts, screws, etc., complete all as specified and directed by Engineer-in-Charge.

Supply and fixing in replacement of gunmetal ball valve suitable for 20 mm bore pipe, complete all as specified and directed by Engineer-in-Charge.

All as per item No. 42 here-in-before, but suitable for 15 mm bore pipe, complete all as specified and directed by Engineer-in-Charge.

M&L for replacement of stainless steel post/frame work fabricated from grade 304 stainless steel pipes including braces, plates, angles, flats, tubular sections, etc., with necessary cutting, hoisting and fixing in position using argon welding, bright finish, buffing and polishing, including grouting in existing foundation with PCC (1:2:4) type B-1 using 20 mm graded stone aggregate, complete with all necessary holes, nuts, bolts, caps and anchor plates, complete all as specified and as directed by Engineer-in-Charge.

M&L for installation of polycarbonate micro prismatic type retro-reflective sign boards conforming to Type XI of ASTM standards, made of 4 mm thick aluminium composite panel substrate having 0.50 mm thick aluminium skin on both sides. The front surface shall be covered with full-cube polycarbonate prismatic reflective sheeting conforming to Type XI of ASTM, with colour scheme, subject matter, message (bi-lingual), symbols and borders as per IRC:67–2001. The aluminium composite panel shall be suitably fixed within a stainless steel frame, complete all as specified and as directed by Engineer-in-Charge.

M&L for mild steel chequered plates of any thickness, conforming to Fe-290 (Grade E-165), laid over cable ducts including taking down old unserviceable plates, complete all as specified and as directed by Engineer-in-Charge.

S&F in repair cable tray of size 300 mm × 50 mm × 3.00 mm thick, complete all as specified and as directed by Engineer-in-Charge.

PANWAR ELECTRICALS (BID ID -3471874)

Radhe Krishn Engineering (BID ID -3470711)