Supply installation testing and commissioning of central VRV air-conditioning system and associated electrical works at 6th and 9th floor of RnD Building in IIT Guwahati Campus

Part A

OUTDOOR UNIT

Supply, installation, testing & commissioning of fully factory assembled Variable Refrigerant Volume type multi unit air-conditioning system inverter type complete with indoor and outdoor units with individual controller for cooling only operations. SITC of Variable Refrigerant Volume Outdoor Unit complete with hermitically sealed scroll compressor as per following nominal capacities complete with protective coated fins, mounting frame, casing, microproccessor panel, and other standard accessories : i) Microproccessor panel , ii) First charge of refirigerant R 410A or R407C , iii) Protective coated fins iv) Mounting frame with isolation pad , all required accessories, structural support and civil foundation. v) Interconnecting Pipes for Liquid, Discharge and Suction vi) Interconnecting Cables and Earthing from nearest given point . All Inverter Scroll Compressor(s) with variable refrigeration evaporating temperature enabled feature in outdoor unit capable of inverter control with 6 pole compressor motor. The inverter compressor should be capable of changing the speed in accordance to the variation in cooling or heating load requirement, back pressure control mechanism for efficient operation in low-load condition. The outdoor unit should be fitted with low noise, aero spiral design fan with minimum External Static Pressure of 75 Pa for easy discharge of Hot air, aero fitting grille, to reduce pressure loss. The outdoor unit should be capable of automatic refrigerant charge function. The heat exchanger shall be constructed with copper tubes mechanically bonded to aluminium fins to form a cross fin coil. The cost should be inclusive of Lifting, Shifting & Positioning of Outdoor Units to the installation platform

Outdoor condensing Unit ( 60 HP) Nominal capacity

Indoor Units- All with cordless remote

Supply, installation, testing & commissioning of variable refrigerant volume modular type indoor units comprising of all accessories as per the specifications. The indoor units shall be suitable to work on cooling as well as heating mode.The indoor units shall be suitable for operation on 220 ±6% volts, 50Hz, 1 phase AC power supply. Ductable indoor units shall be suitable to handle extent of ductwork as shown in the design drawings and dehumidified air quantity as mentioned in the heat load summary sheet under "Special Conditions" and the indoor units shall be of following capacities. SITC of Indoor VRV Ceilling Mounted High Static Flow Type Duct Unit with Independent Vane Control & varibale air flow as per following nominal capacities complete with i) Expansion and mixing arrangements ii) Power Supply interconnections iii) Controlling interconections iv) Piping interconnections v) Supending accessories vi) Insulated Drain pipe line vii) Receiver Kit(Sensor) of Duct AC

4 way Cassette Type Units (1130 cfm/4HP)(nominal capacity)

4 way Cassette Type Units (742 cfm/3.2HP)(nominal capacity)

4 way Cassette Type Units (530 cfm/1.6HP)(nominal capacity)

Supply Installation Testing & Commissioning of corded remote controls as per drawing and specifications.

Refrigerant Piping (VRV System)

Supply,installation,testing and commissioning of Interconnecting copper refrigerant pipe work with (25mm/19 mm thick) closed cell elastomeric nitrile rubber tubular insulation with factory fitted IC-CLAD glass cloth between each set of indoor & outdoor units as per specifications, all piping inside the room shall be properly supported with MS hanger & clamps. Outdoor assumed to Installed in the same Floor.

41.30 mm O.D.(insulation : 25 mm) (Wall Thickness 1.0mm)

38.10 mm O.D.(insulation : 25 mm) (Wall Thickness 1.0mm)

34.90 mm O.D.(insulation : 25 mm) (Wall Thickness 1.0mm)

31.80 mm O.D.(insulation : 25 mm) (Wall Thickness 1.0mm)

28.58 mm O.D.(insulation : 25 mm) (Wall Thickness 1.0mm)

25.40 mm O.D.(insulation : 25 mm) (Wall Thickness 1.0mm)

22.20 mm O.D.(insulation : 25 mm) (Wall Thickness 1.0mm)

19.10 mm O.D.(insulation : 19 mm) (Wall Thickness 1.0mm)

15.88 mm O.D.(insulation : 19 mm) (Wall Thickness 1.0mm)

12.70 mm O.D.(insulation : 19 mm) (Wall Thickness 1.0mm)

09.52 mm O.D.(insulation : 19 mm) (Wall Thickness 0.8mm)

6.40 mm O.D.(insulation : 19 mm) (Wall Thickness 0.8mm)

Supply,installation,testing and commissioning of 2core X 1 mm2 copper wire in PVC conduit as per specifications ( for transmission and remotes)

Supply, Installation,testing and commissioning of REFNET as per drawing and specifications

Supply,installation,testing and commissioning of Heat recovery wheel with inlet and exhaust blowers motors,drives and all accessories and enclosed in 16 Guage GI casing with Al honeycomb clogging media coated with 3 A molecular sieve dessicant absorption material non contact seal,in built purge system modular design with aluminium support of extruded section with electrical panels complete.the s/a and e/a fans shall be of suitable static pressure and a suitable El.starter panel as per drawings and specifications.

Heat Recovery Wheels with minimum 75% efficiency(F/A intake 750 cfm and E/A 650 cfm)

Supply,installation,testing and commissioning of 9 mm thick cross linked polyethylene/closed cell nitrile rubber insulation on duct as per drawings and specifications as required..

Supply,installation,testing and commissioning of fire retardant non porous double layer flexible connection as per drawings and specifications.

Supply,installation,testing and commissioning of CPVC drain pipes with 6 mm nitrile rubber insulatiions complete with supports as per drawings and specifications of below sizes

50 mm dia

40 mm dia

32 mm dia.

25 mm dia

Supply,installation,testing and commissioning alised floor/wall mounted type Electrical panel made of 2 mm thick steel sheet duly painted complete CPRI approved as per the specifications and drawing and as detailed below :

1 No 100 Amps TPN MCCB outgoing for OD units and 2 nos. 32 Amps MCB for TFA units as per drawings and specifications.

Supply and fixing of PVC insulated sheathed 1.1 KV xlpe grade armoured Al. Power cables from A/C Electrical panels upto theirrespective equipment on MS painted perforated trays with appropriate clamps/fixing arrangements as per specifications and drawings.

3 C X 6 Sq. mm Aluminium Cable

4 C X 6 Sq. mm Copper Armourde Cable

4 C X 10 Sq. mm Copper Armourde Cable

4 C X 50 Sq. mm Aluminium Armoured Cable

Supply,installation,testing and commissioning of double earthing continuity conductor of GSS from Panels to respective equipment as per drawings and specifications.

25 mm X 3 mm strip

6 SWG wire

8 SWG wire

Supply, Fabrication and Installation of PCC foundatiions for 4 Nos. Outdoor Condensing units with angle iron framework at edges to protect these from damage at the terrace as per drawings and specifications.ve

Cutting/chasing/drilling openeings and their subsequent repair work for passage of refrigerant pipes,condensate pipes,ducts etc. as per drawings and specifications

Supply of PVC insulated sheathed 1.1 KV grade armoured Al. Power cables from various panels upto their respective equipment as per specifications and drawings.(supply )

3.5 C X 70 Sq. mm Aluminium armoured Cable

Part B

Laying and fixing of one number PVC insulated and PVC sheathed / XLPE power cable of 1.1 KV grade of following size on cable tray as required.

Above 35 sq. mm and upto 95 sq. mm (clamped with 25x3mm MS flat clamp)

Supplying and making end termination with brass compression gland and aluminium lugs for following size of PVC insulated and PVC sheathed / XLPE aluminium conductor cable of 1.1 KV grade as required.

3.5 X 70 Sq. mm (38mm)

Duct/Grilles/Diffusers

Supply, Installation, balancing and commissioning of fabricated at site GSS sheet metal rectangular/round ducting complete with neoprene rubber gaskets, elbows, splitter dampers, vanes, hangers, support etc. as per approved drawing and specifications of following sheet thickness complete as required.

thickness 0.63 mm sheet

thickness 0.80 mm sheet

Supply, installation, testing and commissioning of GI volume control duct damper complete with neoprene rubber gaskets, nuts, bolts, screws linkages, flanges etc, as per specifications.

Supplying, Fixing, installation, testing and commissioning of powder coated extruded aluminium Supply Air Grills with collar control dampers in confirmation to SMACNA/IS and as per specifications complete etc. as required

Supplying, Fixing, installation, testing and commissioning of powder coated extruded aluminium Return Air Grills without collar control dampers in confirmation to SMACNA/IS and as per specifications complete etc. as required All these grilles shall be single louvered similar to supply air registers.

Supplying, Fixing, installation, testing and commissioning of supply air diffusers of powder coated aluminium with aluminium volume control dampers with anti smudge ring & removable core in confirmation to SMACNA/IS and as per specifications complete etc. as required. Cost shall include plenum box of diffuser with 9 mm insulation.

Supplying, Fixing, installation, testing and commissioning of return air diffusers of powder coated aluminium without aluminium volume control dampers with anti smudge ring & removable core in confirmation to SMACNA/IS and as per specifications complete etc. as required. Cost shall include plenum box of diffuser with 9 mm insulation.

Supply and fixing of acoustic lining of supply air duct and plenum with 25 mm thick nitrile insulation having density of 32 kg/m³, with 25 mm X 25 mm GI section of 1.25 mm thick, at 600 mm centre to centre covered with Reinforced Plastic tissue paper and 0.5 mm thick perforated aluminum sheet fixed to inside surface of ducts with cadmium plated nuts, bolts, stick pins, CPRX compound etc. complete as required and as per specifications.

Supplying and installaton following size of perforated painted with powder coating M.S. cable trays with perforation not more than 17.5%, in convenient sections, joined with connectors, suspended from the ceiling with two numbers MS/GI Suspenders i/c base of suitable size MS/GI angle, bolts & nuts, painting suspenders, fastener etc as required.

300 mm width X 50 mm depth X 1.6 mm thickness [Electrical Cable]

450 mm width X 50 mm depth X 1.6 mm thickness [Copper piping]

Supplying and installaton following size of perforated painted with powder coating M.S. cable tray bends with perforation not more than 17.5%, in convenient sections, joined with connectors, suspended from the ceiling with two numbers MS/GI Suspenders i/c base of suitable size MS/GI angle, bolts & nuts, painting suspenders, fastener etc as required.

300 mm width X 50 mm depth X 1.6 mm thickness

450 mm width X 50 mm depth X 1.6 mm thickness

Supplying and installaton following size of perforated painted with powder coating M.S. cable tray tee with perforation not more than 17.5%, in convenient sections, joined with connectors, suspended from the ceiling with two numbers MS/GI Suspenders i/c base of suitable size MS/GI angle, bolts & nuts, painting suspenders, fastener etc as required.

300 mm width X 50 mm depth X 1.6 mm thickness

450 mm width X 50 mm depth X 1.6 mm thickness

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