Mahanagar Telephone Nigam Limited Tender

7.5TR Package A C unit (bottom discharge) with two independent refrigerant circuits and two compressors of equal rating.

Supply, Installation on existing foundation/platform/stand/frame, testing and commissioning of following rated microprocessor controlled air-cooled air-conditioning units with all components, controls, interlocking, electrical accessories including indoor & outdoor units, various motors, coils, filters, controller as per detailed technical specifications attached etc. complete as required. The Air-conditioning unit shall be suitable for operation on 415V+/-10%, 50Hz, Three phase AC supply. NOTE: 1. If any a.c. unit of rating higher than that mentioned above is offered by the firm which meets the prescribed technical specifications shall be accepted by the department without any extra charges. 2.. In case of replacement of existing AC plant/ AC units, dismantling of all components of existing air cooled AC units along with associated copper piping, ducting, electrical cables and panels, foundations MS works for indoor and outdoor units and all other associated components as per site requirement including cutting, handling and stacking at required place in the premises of the same building and handing-over to the department is included in the above item for which nothing extra shall be paid by the department.

7.5TR ductable A C units

Providing and fixing of following sizes of copper refrigerant piping (soft ananealed/hard drawn) with class 'O' tubular insulation and all accessories i/c cutting, bending, jointing, brazing etc. for refrigerent circuits of air-conditioning units, on existing surface complete as per specifications attached.

7/8"

3/4"

5/8"

1/2"

3/8"

1/4"

Supply and installation of fresh air package capable of delivering 1200CFM provided with coarse filter having efficiency of 90% down to 20 microns, EU-2 type and fine filters for outside air having efficiency of 99.9 % for dust particles down to 5 microns, EU-5 type, mounted on a suitable frame along with necessary dry fabric synthetic type cleanable pre-filters, necessary sheet metal louvers/grills with volume control damper,minor civil works including making openingin the wall and subsequent repairs etc. compete as per specification. Necessary booster fans suitable for operation on 230 (+/- 5%) volts single phase 50 Hz A.C. Supply shall be provide to overcome the static pressure of fine filters as required.

Providing and fixing factory fabricated/ site-fabricated GSS ducting i/c plenum of following sheet thickness, guide vanes i/c minor civil works making opening in the walls/partitions/floors and subsequent repairs etc. complete as per specifications and site requirement.

0.63mm (24 gauge)

0.80mm (22 gauge)

1.00mm (20 gauge)

Providing/making & fixing canvass connection made out of fire-resistant canvas cloth and GI frame of size suitable for package/ductable a.c. unit etc. complete as required.

Supply & fixing of following type of damper of size upto 5sq.ft. made out of 18 gauge CRC/G I sheet used as fire damper,supply air damper or return air damper in main duct or branch duct or in return air path for package/ ductable AC indoor units as per site requirement. i/c nut bolt, gasket etc. as required.

Fire damper

Volume control damper

Supplying, Laying & fixing of 1.1KV grade XLPE insulated copper conductor armoured cables of following sizes on the existing surface with saddles, screws etc. i/c testing and commissioning and end-termination with brass compression gland and copper lugs etc. complete as required.

4 x 16 sq. mm

4 x 10 sq. mm

4 x 6 Sq. mm

3 x 2.5 sq. mm

4 x 1.5 sq. mm

2 x 1.5 sq. mm

Providing plumbing work for humidification circuits and drainage requirements including supply of cPVC/uPVC pipes, pipe fittings such as bends, reducers, elbows, tees, unions, flanges etc. for water supply/drain connection of various components of the system.

38mm dia (NB)

25mm dia (NB)

Supply, Installation, Testing and commissioning of audio visual annunciation prewired panel complete with required control accessories like relays, contactors and lamps, switches, fuses, wires, ferrules, connectors and proportional sheet metal work as per site requirement with each set consisting of required number of indications, suitable for package/ductable AC plants suitable up-to 5 no. of AC units complete as required.

Supplying, Laying & fixing of following earthing material including fixing of hardware complete as required.

25mm x 3mm hot dip G I strip

8SWG G I wire

Providing & fixing cable tray, M.S structure for cables / refrigeration pipes / indoor units /outdoor units etc.fabricated out of M.S Channels/ Angles/ Flats/mesh i/c cutting, welding, painting, drilling holes, fixing on existing suraface etc complete as required.

150mm wide M.S. slotted angle cable tray

300mm wide M.S. slotted angle cable tray

M.S. flat/Angle iron/Channel/Tee/I -section

8mm M S rod

Pdg. & fixing MS frame(stand type) for outdoor A C unit complete as reqd..

Pdg. & fixing MS frame/suspender for indoor A C unit complete as reqd.

Pressure testing with nitrogen, pressure standing for at least 8 hr., vaccumzing & commissioning with refrigerant of following A.C.unit complete as reqd.-

10TR A.C. unit

7.5TR Package A.C. unit

7.5TR Ductable A.C. unit

Supplying and filling refrigerant suitable for top-up in above package/ductable /VRF A.C.units (to be measured on actual basis only in cases where circuit length of the refrigerant pipe exceeds 5mtr & additioinal top-up is required as per recommendation of manufacturer)