COMPREHENSIVE REPAIR AND MAINTENANCE OF CENTRALISED

Amount

Comprehensive maintenance for chilling package of (350X2=700 TR) Screw type refrigeration Compressor with R134A refrigerant with Microprocessor panel and suction and Discharge control valves including one annual and three periodical inspection during the contract period at approximately equal intervals by the OEM and the maintenance program will proceed as and when required as per the inspection report provided by company representative and servicing of complete power supply system of the AC Plant including sub panels complete all as specified and directed by the engineer in charge as detailed below notes

Comprehensive maintenance for chilling package of (50X3=150 TR) Scroll type refrigeration Compressor with R407C refrigerant with Microprocessor panel and suction and Discharge control valves including one annual and three periodical inspection during the contract period at approximately equal intervals by the OEM and the maintenance program will proceed as and when required as per the inspection report provided by company representative and servicing of complete power supply system of the AC Plant including sub panels complete all as specified and directed by the engineer in charge. as detailed below notes

NOTE FOR SERIAL ITEM NO 01 & 02 ABOVE (a) Carry the proper functioning of microprocessor panel and take the control test (b) Check the electrical panels for tripping, overheating, chattering in electrical parts and terminals for proper tightness. (c) Check for proper working of all Ammeters, voltmeters, Hour mtrs, KWH Mtrs and overload relays, fan belt etc and replacing the same if found unserviceable (d) Checking the operation of MCCB's up to 250 Amps, MCB, Isolators, etc and replacing the same if found unserviceable. Proper load balancing should be carried out by the contractor of electric supply system to the chiller machines and necessary arrangements will be carried out for measurement of electric load in all phases by the contractor at no additional cost and the subject report of load in the electrical panel will be submitted at the time of inspection report of the chillers. (e) Clean electrical panels and chiller machine periodically. (f) Check functioning of water flow switch and interlock in the system. (g) Check all safety and operating controls for proper functioning and replace if the same is defective for proper sequence of operation of the machine (h) All the breakdowns including compressor failure will be attended and the visit shall not be counted in periodical inspection. (j) Check refrigerant filter and drier core, replace the same, if found necessary. (k) Check oil level and oil heater in the system. (l) Check chilled water flow by checking pressure drop across the chiller (m) Check evaporator and condenser approach and compare the chilled water temperature at full load with the chilled water temperature control (n) Seasonal adjustment of controls if required and software upgrade (o) Inspect entire system for any unusual condition such as noise, vibration etc (p) Supply of electrical parts except electrical spares for incoming panel. (Electrical Spares Like:- fuses, incoming electrical controls, flexible wire, All type of starter parts including wiring etc)

(q) All changes/ repair shall be valid only after satisfaction of Engr-in-charge/GE. Contractor shall submit all related documents of expenditure of the contract time to time to avoid delay on payment (r) Checking the operation of all suction and discharge control valves etc If found faulty /leakage to be replaced by the contractor with out any extra cost. (s) Filling of oil. (t) The contractor shall arrange required tools for attend routine services/minor breakdown call like an adjustable spanner, clamp meter, pressure gauge with gorging line, digital temperature gun, fix spanner set, Allen key set, screwdriver set, cotton waste software support if required. (u) The contractor shall also arrange required equipment's for attending major breakdown call like as a vacuum pump, Digital Vacuum gauge, Refrigerant recovery unit, Empty refrigerant cylinders, dehydration tank and required spanners. (v) clean the cooling tower and Drain the water and clean the sump of cooling tower, Clean pot strainer/y-strainer, check the condition of fills, if required, clean the fills with detergent, check for operation of shut off valves. (s) If AC Plants have any breakdown take immediate action and arrange to provide all necessary material, T&P and labour,If the contractor is unable to provide material and delay in smooth operation/working of AC Plant/AHU etc recovery will be done at the rate of Rs.3000/- per hour Note:- Descaling of condenser and chiller tubes, Checking leakage of refrigerant and nitrogen pressure testing including nitrogen, Gas (Refrigerant), Temperature sensor, Bellows, Differential pressure switch unit, Expansion Valve, Compressor Oil, Servicing of Secondary pump, Servicing of primary & Secondary pump, Servicing of chiller water pumps/condenser water pump, Servicing of blowers for AHU's with induction motor, single phasing preventer, electronic timer will be covered underrespective items of BOQ.

Descaling of 350X2=700 TR (chemical cleaning and physical cleaning) of condenser and chiller tubes all as specified and directed by Engr-in-Charge.

Descaling of 50X3=150 TR TR (chemical cleaning and physical cleaning) of condenser and chiller tubes all as specified and directed by Engr-in-Charge.

Checking leakage and shortage of refrigerant in the machines of 350X2=700 TR/ 50X3=150 TR with soap solution and rectify the system defect causing leakage and rectification including topping up of refrigerant. If leakage is not rectified by the soap solution, then Nitrogen pressure testing will be carried out to identify the refrigerant leakage through the chiller machine and refilling/topping up of refrigerant. Amount quoted by the contractor should be inclusive of cost of nitrogen pressure testing including Nitrogen complete all as specified and directed by Engr-in Charge

Supply only Gas R134A/ R407C of 350X2=700 TR/50X3=150 TR unit for AC Plant complete all as specified and directed by Engr-in Charge

S&F Temperature chilled water sensor/Temperature cooling water sensor of AC Plant complete as in repairs all as specified and directed by Engr-in Charge

S&F Bellows of size 250x200 mm as per existing complete as in repairs all as specified and directed by Engr-in Charge.

S&F Differential pressure switch unit of 350X2=700 TR/ 50X3=150 TR Ac plant complete as in repairs all as specified and directed by Engr-in Charge.

S&F Expansion Valve of AC Plant complete as in repairs all as specified and directed by Engr-in Charge.

Supply only Compressor Oil of AC Plant complete as in repairs all as specified and directed by Engr-in Charge.

M&L Servicing of back pull out primary chilled water pump with induction motor of Capacity 20 HP operated on 240V, 50 Hz with replacing of difective parts such as box, mechanical seal , cut off switch, bearing , complete as per site requirement and as directed by Engr-in-charge.

M&L Servicing of back pull out Secondary chilled water pump with induction motor of Capacity 30 HP operated on 240V, 50 Hz with replacing of box set-04 Nos, mechanical seal -01 No, cut off switch 01 No, bearing 02 Nos, Air filling in tank complete as per site requirement or as directed by Engr-in-charge.

M&L Servicing of back pull out condenser water pump with induction motor of Capacity 40 HP operated on 240V, 50 Hz wither placing of defective parts such as box, mechanical seal , cut off switch, bearing , complete as per site requirement or as directed by Engr-in-charge.

M&L Servicing of back pull out chiller water pumps/condenser water pump with induction motor of Capacity 5 HP operated on 240V, 50 Hz with replacing of box set-04 Nos, mechanical seal -01 No, cut off switch 01 No, bearing 02 Nos, Air filling in tank complete as per site requirement or as directed by Engr-in-charge.

M&L Servicing of blowers for AHU's with induction motor of Capacity 10 HP operated on 240V, 50 Hz with replacing of defective parts such as box, mechanical seal , cut off switch, bearing , complete as per site requirement or as directed by Engr-in-charge.

Note for item No.12 to 16 (a) Check the alignment and conditions of coupling to prevent damage to shaft and impeller. (b) Lubricate bearings with grease guns. (c) Replace gland thread if required. (d) Check lubricant oil level and make up the oil if required. (e) Check packing and mechanical seals for leakage. (f) Half yearly inspection and service for pumps (g) Inspect shaft sleeves, shaft, bearings , bearing housing and overhauling of all pumps. (h) The impeller and shaft to be repaired and made functional. If they are found not repairable, then same will be replaced . (j) The packing, mechanical seal, bush, bearing, Shaft sleeves, coupling etc. If found faulty to be replaced by the contractor without any extra cost.

M&L Taking out & rewinding the existing unserviceable burnt motors of condenser/chiller water pumps (Pressure pumps) of capacity upto 10 HP,Three phase, 50 cycles by disconnecting electrically and mechanically and transporting to the locally workshop. Dismantling the motor and removing the old burnt copper winding & demoisturise, cleaning, rewinding the coils with same gauge supper enamelled copper wire, with suitable F class paper insulation, varnishing, and reassembling by replacing bearings reinstalling at the installation and testing, commissioning etc complete.

M&L Taking out & rewinding the existing unserviceable burnt motors of condenser/chiller water pumps (Pressure pumps) of capacity from 20 HP Upto 40 HP,Three phase, 50 cycles by disconnecting electrically and mechanically and transporting to the locally workshop. Dismantling the motor and removing the old burnt copper winding & demoisturise, cleaning, rewinding the coils with same gauge supper enamelled copper wire, with suitable F class paper insulation, varnishing, and reassembling by replacing bearings reinstalling at the installation and testing, commissioning etc complete.

M & L Spray painting to AC plant including motor, pipe cooling tower etc on existing colour complete all as specified and directed by Eng-in-charge.

S&F Single phasing preventor of Make-Ellico, Type-ESP-2 , 415 Volt, 50 Hz complete as in repair all as specified.

S&F Electronic timer of Make-Ellico, Type-S/D100 , 230/415 Volt, complete as in repair all as specified.

S&F MCCB 3 pole 630 Amp, 50 KA, 415 volts 50 Hz including operating handle complete as in repair all as specified.

Supply and laying XLPE insulated PVC inner sheathed, armoured with galvanised steel strip or wire heavy duty underground cable with copper multi stranded conductor 1100 volt grade of size 25 Sqmm 3 core laid in trenches / duct passing through pipe / duct or fixed on pole and connecting and testing complete all as specified and as directed.

Supply and laying XLPE insulated PVC inner sheathed, armoured with galvanised steel strip or wire heavy duty underground cable with copper multi stranded conductor 1100 volt grade of size 25 Sqmm 4 core laid in trenches / duct passing through pipe / duct or fixed on pole and connecting and testing complete all as specified and as directed.

Note : In case of any AC Plant breakdown has occurred, the contractor shall take immediate action arrange all necessary material, T & P and labour and the contractor is , unable to provide material and delay in smooth operation/working of AC Plant/AHU etc recovery will be done at the rate of Rs. 3000/- per hour.

ARTI CONSTRUCTION

ALBA AC AND REF SERVICES