Table of Contents Sr. No.
Description Description
Page No
1. BASIS OF DESIGN ........................................................................................................................................1 2. AIR COOLED SPLIT AIR CONDITIONING CONDITIO NING UNITS ............. ................... ............ ............ ............ ............ ............. ............. ............ ............ ............ ........1 ..1 3. FANS .................................................................................................................................................................3 4. REFRIGERANT PIPING...............................................................................................................................6 5. PIPING PIPIN G INSTALLA INST ALLATION TION .............................................................................................................................7 6. AIR DISTRIBUTION.....................................................................................................................................8 7. INSULATION................................................................................................................................................11 APPENDIX-I.....................................................................................................Error! APPENDIX-I..................................................................................................... Error! Bookmark not defined. Error! Bookmark not defined. L IST OF HVAC DRAWINGS .................................................................Error! APPENDIX - II .......................................................................................................................................................15 LIST OF APPROVED APPRO VED MAKES FOR EQUIPMENT EQUIPM ENT & MATERIALS ................ ...................... ............. ............. ............ ............ .........1 ...15 5 Error! Bookmark not defined. APPENDIX-III..................................................................................................Error! APPENDIX-III.................................................................................................. GUARA NTEE PROFORMA PROFO RMA ............ ................... ............. ............ ............ ............ ............ ............. ............. ........... .....Error! Error! Bookmark not defined.
TECHNICAL SPECIFICATIONS 1.
BASIS OF DESIGN
1.1
Site location.
: Pune – Maharashtra
1.2
Geographic location.
: 18.53 Deg N 73.85 Deg E
1.3
Altitude.
: 559 Mtrs. above mean sea level
1.4
OUTDOOR DESIGN CONDITIONS The outdoor design conditions for various months for Pune have been considered as follows : Summer
:
38.4 °C ( 101.12 °F) DB 20.5 °C (68.9°F) WB (mean coincidental)
Monsoon
:
30.9 °C ( 87.62 °F) DB (mean coincidental) 24.8 °C ( 76.64 °F) WB
Winter
:
9.2 °C ( 48.56 °F) DB 8.0 °C ( 46.4 °F) WB (mean coincidental)
Outdoor conditions are based on 0.4% cumulative frequency distribution (ISHRAE weather data book). 1.5
INDOOR DESIGN CONDITIONS : Indoor design conditions for Air Conditioned spaces shall be as follows : a.
Office areas, Cafeteria, Meeting Rooms DB : 23 ± 1 Deg C (74 ± 2 Deg F) RH : Less than 60%
1.6
ASSUMPTIONS FOR HVAC LOADS :
Glass ( Single Glass with control films)
:
Solar-0.56 2. 0 Transmission – 1.13 Btu/hr/Ft F
Wall ‘U’ Value
:
0.34 Btu/Hr. Ft . F (Exposed) 2 O 0.30 Btu/Hr. Ft . F (Partition)
Roof ‘U’ Value considering 65mm thick : extruded polystyrene.
0.12 Btu/Hr. Ft . F (Exposed)
Outside air quantity
As per ASHARE 62.1 - 2004
:
2.
AIR COOLED SPLIT AIR CONDITIONING UNITS
2.1
SCOPE
The scope of this section comprise the supply, erection, testing and commissioning of Air Cooled Split Units conforming to these specifications and in accordance with the requirements of Drawings and Schedule of Quantities. 2.2
TYPE The Split Units shall consist of hermetically sealed reciprocating / Scroll compressor, motor, air cooled condenser, integral refrigerant piping and wiring, all mounted on a steel frame. Indoor unit to be installed for Split Unit within building, shall be housed in insulated cabinet consistin g of cooling coil, blower with motor, filter & insulated drain pan. The Air cooled condenser with fan and compressor duly mounted on a common frame shall be installed at suitable places as per drawing with suitable angle iron / channel frame to be provided by contractor. The suitable starters, switches, power control cabling between Air Indoor Unit and Outdoor Unit shall be included by the contractor.
2.3
CAPACITY The refrigeration capacity of Split unit shall be as shown on Drawings and in Schedule of Quantities.
2.4
COMPRESSOR AND MOTOR Compressor shall be hermetic reciprocating / Scroll, serviceable type and shall have dual pressure stat, and an operating oil charge. The motor shall be suction gas cooled and shall be sealed against dirt and moisture. The motor shall be suitable for 415±10% / volts or 230±10 % volts, 50 Hz, A.C. supply.
2.5
REFRIGERANT PIPING AND CONTROLS Refrigerant piping and fittings interconnecting compressor condenser shall be all copper and valves shall be brass / gunmetal construction.
2.6
CASING The indoor & outdoor units shall be sectionalised / cabinet construction. Indoor units shall be consisting of fan section, coil section, filter section, and drain pan. Outdoor unit shall consist of condenser coil, fan & compressor. In case of split unit, the compressor shall be mounted with the outdoor units. Each section shall be constructed of thick sheet steel all welded / bolted construction, adequately reinforced with structural members and provided with sufficient access panels for proper lubrication and maintenance. Base panel shall be constructed of fabricated steel structure provided with an under frame suitably braced. Each unit shall include one piece drain pan constructed of 20 gauge galvanised sheet steel plate. Drain pan shall extend under coil and fan sections with drain connections. Removable panels in fan and coil sections shall provide access to all internal parts. Panels shall be internally lined with 2.5 cm thick fibreglass as per section “Insulation” for the thermal insulation and acoustic lining.
2.7
FAN MOTOR AND DRIVE Fan motor shall be suitable for 415 ± 10% volts or 230±10% volts, 50 Hz, A.C.Supply, Single phase, motors shall be provided with permanent capacitor. Motors shall be especially designed for quite operation and motor speed shall not exceed 1440 rpm.
2.8
FAN Fan wheels and housing shall be fabricated from heavy gauge steel. Fan wheels shall be of double -width, double inlet forward-curve, multi-blade type enclosed in a housing and mounted on a common shaft. Fan housing shall be made of die -formed steel sheets with stream-lined inlets to ensure smooth air flow into the fans, fan shaft bearing shall be oil/grease lubricated. All rotating parts shall be dynamically balanced individually , and the complete assembly shall be statically and hydraulically balanced. Fan speed shall not exceed 1000 rpm and maximum fan outlet velocity shall be 550 meters per minute.
2.9
COOLING COIL Cooling coils shall be of fin and tube type having aluminium fins firmly bonded to copper tubes assembled in zinc coated steel frame. Face and surface areas shall be such as to ensure rated capacity from each unit and air velocity across each coil shall not exceed 100 meters per minute. The coil shall be pitched in the unit casing for proper drainage. Each coil shall be factory-tested at 21 Kg. per sq.cm air pressure under water. Tube shall be mechanically / hydraulically expanded for minimum thermal contract resistance with fins. The number of fins per cm. shall be 4 to 5.
2.10
VIBRATION ISOLATORS The indoor and outdoor units shall be provided with ribbed rubber pad vibration isolators.
2.11
PAINTING Split units shall be factory finished with durable alkyd spray enamel. Shop coats of paint that have become marred during shipment or erection shall be cleaned off with mineral spirits, then coated with enamel paint to match the finish over the adjoining shop-painted surface.
2.12
PERFORMANCE RATING The unit shall be selected for the lowest operating noise level. Capacity rating and power consumption with operating points clearly indicated shall be submitted with the tenders and verified at the time of testing and commissioning of the installation.
3.
FANS
3.1
SCOPE The scope of this section comprises the supply, erection, testing and commissioning of centrifugal, in-line and propeller type fans conforming to these Specifications and in accordance with the requirement of Drawings and Schedule of Quantities.
3.2
TYPE
Centrifugal, in-line propeller fans shall be of the type as indicated on Drawings and identified in Schedule of Quantities. 3.3
CAPACITY The air-moving capacity of fans shall be as shown on Drawings and in Schedule of Quantities.
3.4
CENTRIFUGAL FAN Centrifugal fan shall be DWDI / SWSI Class I construction arrangement 3 (i.e. bearings on both the sides) for DWDI fans complete with access door, squirrel-cage induction motor, V-belt drive, belt guard and vibration isolators, direction of discharge / rotation, and motor position shall be as per the Approved-forConstruction shop drawings. a.
Housing shall be constructed of 14 gage sheet steel welded construction. It shall be rigidly reinforced and supported by structural angles. Split casing shall be provided on larger sizes of fans, however neoprene / asbestos packing should be provided throughout split joints to make it air-tight. 18 gauge galvanized wire mesh inlet guards of 5 cm sieves shall be provided on both inlets. Housing shall be provided with standard cleanout door with handles and neoprene gasket. Rotation arrow shall be clearly marked on the housing.
3.5
b.
Fan Wheel shall be backward-curved non-over loading type. Fan wheel and housing shall be statically and dynamically balanced. For fans upto 450 mm dia, fan outlet velocity shall not exceed 550 meter/minute and maximum fan speed shall not exceed 1450 rpm. For fans above 450 mm dia, the outlet velocity shall be within 700 meter/minute and maximum fan speed shall not exceed 1000 RPM. High static pressure fan speed shall be as per manufacturer.
c.
Shaft shall be constructed of steel, turned, ground and polished.
d.
Bearings : shall be of the sleeve / ball-bearing type mounted directly on the fan housing. Bearings shall be designed especially for quiet operation and shall be of the self-aligning, oil / grease pack pillow block type.
e.
Motor : Fan motor shall be energy efficient and suitable for 415±10% volts, 50 cycles, 3 phase AC power supply, squirrel-cage, totally enclosed, fancooled motor, provided with class F insulation, and of approved make. Motor name plate horsepower shall exceed brake horsepower by a minimum of 10%. Motor shall be designed specially for quie t operation and motor speed shall not exceed 1440 rpm. The fan and motor combination selected for the particular required performance shall be of the most efficient (smallest horse power), so that sound level is lowest.
f.
Drive to fan shall be provided through belt with adjustable motor sheave and a standard belt guard. Belts shall be of the oil-resistant type.
g.
Vibration Isolation : MS base shall be provided for both fan and motor, built as an integral part, and shall be mounted on a concrete foundation through resistoflex vibration isolators. The concrete foundation shall be atleast 15 cm above the finished floor level, or as shown in approved-forconstruction shop drawings.
AXIAL FLOW FAN
Fan shall be complete with motor, motor mount, belt driven (or direct driven) and vibration isolation type, suspension arrangement as per approved for construction shop drawings. a.
Casing : shall be constructed of heavy gage sheet steel. Fan casing, motor mount and straightening vane shall be of welded steel construction. Motor mounting plate shall be minimum 15 mm thick and machined to receive motor flange. An inspection door with handle and neoprene gasket shall be provided. Casing shall have flanged connection on both ends for ducted applications. Support brackets for ceiling suspension shall be welded to the casing for connection to hanger bolts. Straightening vanes shall be aerodynamically designed for maximum efficiency by converting velocity pressure to static pressure potential and minimizing turbulence. Casing shall be bonderized, primed and finish coated with enamel paint.
b.
Rotor : hub and blades shall be cast aluminium or cast steel construction. Blades shall be die -formed aerofoil shaped for maximum efficiency and shall vary in twist and width from hub to tip to effect equal air distribution along the blade length. Fan blades mounting on the hub shall be statically and dynamically balanced. Extended grease leads for external lubrication shall be provided. The fan pitch control may be manually readjusted at site upon installation, for obtaining actual air flow values, as specified and quoted.
c.
Motor: shall be energy efficient squirrel-cage, totally-enclosed, fan cooled, standard frame, constant speed, continuous duty, single winding, suitable for 415±10% volts, 50 cycles, 3 phase AC power supply, provided with class `F’ insulation. Motor shall be specially designed for quiet operation. The speed of the fans shall not exceed 1000 RPM for fans with impeller diameter above 450 mm, and 1440 RPM for fans with impeller diameter 450 mm and less. For lowest sound level, fan shall be selected for maximum efficiency or minimum horsepower. Motor conduit box shall be mounted on exterior of fan casing, and lead wires from the motor to the conduit box shall be protected from the air stream by enclosing in a flexible metal conduit.
d.
Drive : to fan shall be provided through belt drive with adjustable motor sheave and standard sheet steel belt guard with vented front for heat dissipation. Belts shall be of oil-resistant type.
e.
Vibration Isolation : The assembly of fan and motor shall be suspended from the slab by vibration isolation suspension of rubber-in-shear type.
f.
Accessories : The following accessories shall be provided with all fans : i.
Outlet cone for static pressure regain.
ii.
Inlet cone.
Fan silencers may be provided where specifically called for in Schedule of Quantities. Fans shall be factory assembled and shipped with all accessories factory-mounted. 3.6
PROPELLER FAN Propeller fan shall be direct-driven, three or four blade type, mounted on a steel mounting plate with orifice ring. a.
Mounting Plate shall be of steel construction, square with streamlined venturi inlet (reversed for supply applications) coated with baked enamel
paint. Mounting plate shall be of standard size, constructed of 12 to 16 gauge sheet steel depending upon the fan size. Orifice ring shall be correctly formed by spinning or stamping to provide easy passage of air without turbulence and to direct the air stream.
3.7
b.
Fan Blades shall be constructed of aluminium or steel. Fan hub shall be of heavy welded steel construction with blades bolted to the hub. Fan blades and hub assembly shall be statically and dynamically balanced at the manufacturer’s works.
c.
Shaft shall be of steel, accurately ground and shall be of ample size for the load transmitted and shall not pass through first critical speed thru the full range of specified fan speeds.
d.
Motor shall be standard (easily replaceable) permanent split capacitor or shaded pole for small sizes, totally enclosed with prelubricated sleeve or ball bearings, designed for quiet operation with a maximum speed of 1000 rpm for fans 60 cm dia or larger and 1440 rpm for fans 45 cm dia and smaller. Motors for larger fans shall be suitable for 415±6% volts, 50 cycles 3 phase power supply, and for smaller fans shall be suitable for 220 ± 6% volts, 50 cycles single phase power supply. Motors shall be suitable for either horizontal or vertical service as indicated on Drawings and in Schedule of Quantities.
e.
Accessories : The following accessories shall be provided with propeller fans : i.
Wire guard on inlet side and bird screen at the outlet.
ii.
Fixed or gravity louvers built into a steel frame at the outlet.
iii.
Regulator for controlling fan speed for single phase fan motor.
iv.
Single phase preventers’ for 3 phase fans.
PERFORMANCE DATA All fans shall be selected for the lowest operating noise level. Capacity ratings, power consumption, with operating points clearly indicated, shall be submitted and verified at the time of testing and commissioning of the installation.
3.8
TESTING Capacity of all fans shall be measured by an anemometer. Measured air flow capacities shall conform to the specified capacities and quoted ratings. Power consumption shall be computed from measurements of incoming voltage and input current.
4.
REFRIGERANT PIPING
a.
All refrigerant pipes and fittings shall be hard drawn copper tubes and wrought copper / brass fittings suitable for connection with silver solder / phos-copper.
b.
All joints in copper piping shall be sweat joints using low temperature brazing and / or silver solder. Before joining any copper pipe or fittings, its interiors shall be thoroughly cleaned by passing a clean cloth via wire or cable through its entire length. The piping shall be continuously kept clean
of dirt etc. while constructing the joints. Subsequently, it shall be thoroughly blown out using carbon dioxide / nitrogen.
5.
c.
Refrigerant lines shall be sized to limit pressure drop between evaporator and condensing unit to less than 0.2 kg per sq.cm.
the
d.
Sight glass with moisture indicator and removable type combination dryer cum filter with MS housing and brass wire mesh / punched brass sheet shall be installed in liquid line of the refrigeration system incorporating a three valve by pass. After ninety days of operation, liquid line drier cartridges shall be replaced.
e.
Horizontal suction line shall be pitched towards the compressor and no reducers shall be provided for proper oil return.
f.
After the refrigerant piping installation has been completed, the refrigerant piping system shall be pressure tested using Freon mixed with nitrogen / carbon dioxide at a pressure of 20 kg per sq. cm (high side) and 10 kg per sq. cm (low side). Pressure shall be maintained in the system for a minimum of 12 hours. The system shall then be evacuated to a minimum vacuum of 70 cm of mercury and held for 24 hours. Vacuum shall be checked with a vacuum gage.
g.
All refrigeration piping shall be installed strictly as per the instructions and recommendations of air conditioning equipment manufacturer.
PIPING INSTALLATION
a.
Design Drawings indicate schematically the location of pipes. The Contractor, on award of the work, shall prepare detailed shop drawings, showing the cross-section, longitudinal sections, details of fittings, locations of isolating and control valves, drain and air valves, and all pipe supports. He must keep in view the specific openings in the building through which pipes are designed to pass. Pipe shall be cut only with hack saw blades and welding rods shall not be used for this purpose. All the pipes shall be cleaned and applied with one coat of Zinc chromate primer.
b.
Piping shall be properly supported on, or suspended from, stands, clamps, hangers as specified and as required. The Contractor shall adequately design all the brackets, saddles, anchors, clamps and hangers and be responsible for their structural sufficiency.
c.
Pipe supports shall be of steel, adjustable for height and Zinc chromate primer coated and finish coated black. Where pipe and clamps are of dissimilar materials, a gasket shall be provided in between. Spacing of pipe supports shall not exceed the following : ___________________________________________________________ Pipe size Spacing between supports Rod Size ___________________________________________________________ Upto 12 mm 1.5 Meter 8 mm
15 to 25 mm
6.
2.0 meter
8 mm
d.
Bull heading in water/refrigerant piping shall be avoided.
e.
Pipe sleeves at least 3 mm thick, 50 mm / 100 mm larger in diameter than condenser / ref. (with insulation) pipes respectively shall be provided wherever pipes pass through retaining wall and slab. Annular space shall be filled with fiberglass and finished with retainer rings welded on the ends of the sleeve.
f.
Wherever pipes pass through the brick or masonry / slab openings, the gaps shall be sealed with fire sealant such as fire barrier caulks.
g.
All piping work shall be carried out in a workmen like manner, causing minimum disturbance to the existing services, buildings and structure. The entire piping work shall be organized, in consultation with other agencies work, so that laying of pipes, supports, and pressure testing for each area shall be carried out in one stretch.
h.
Cut-outs in the floor slabs for installing the various pipes are indicated in the Drawings. Contractor shall carefully examine the cut-outs provided and clearly point out where the cut-outs shown in the Drawings do not meet with the requirements.
i.
The Contractor shall make sure that the clamps, brackets, clamp saddles and hangers provided for pipe supports are adequate.
j.
All pipes shall be accurately cut to the required size in accordance with relevant BIS Codes, edges beveled and burrs removed before laying.
AIR DISTRIBUTION (FOR DUCTS FABRICATED AT SITE AS PER “ BIS” STANDARD)
6.1
SCOPE The scope of this section comprises supply fabrication installation and testing of all sheet metal / flexible ducts, supply installation testing and balancing of all dampers, and registers, in accordance with these specifications and the general arrangement shown on the Drawings.
6.2
DUCT MATERIALS All ducts shall be fabricated from galvanized steel sheets / aluminium sheets of the following thickness as indicated in Schedule of Quantities. GSS
ALUMINIUM
Rectangular ducts upto 75 cm
24 gage
22 gage
Rectangular ducts 76 to 150 cm and all round ducts.
22 gage
20 gage
Rectangular ducts 151 to 225 cm
20 gage
18 gage
Rectangular ducts greater than 225 cm 18 gage
16 gage
Sheet metal ducts shall be fabricated out of galvanized steel sheets. Fabrication of ducts shall be through well conditioned Triplex lock former or multiple lock
formers, conforming to relevant BIS Codes. Sheets used shall be produced by Hot Dip Process . 6.3
All ducts shall be fabricated and installed in workmanlike manner, generally conforming to relevant BIS Codes. Round exposed ducts shall be die -formed for achieving perfect circle configuration.
6.3.1
a.
Ducts shall be straight and smooth on the inside with neatly finished joints. All joints shall be made air tight.
b.
Changes in dimensions and shape of ducts shall be gradual. Air-turns (Vanes) shall be installed in all bends and duct collars designed to permit the air to make the turn without appreciable turbulence.
c.
Ducts shall be fabricated as per details shown on Drawings. All ducts shall be rigid and shall be adequately supported and braced where required with standing seams, tees, or angles, of ample size to keep the ducts true to shape and to prevent buckling, vibration or breathing.
d.
Self adhesive rubber lining minimum 5 mm thick instead of felt, shall be used between duct flanges and between duct and duct supports in all ducting installation.
6.4
All ducts shall be installed generally as per tender Drawings, and in strict accordance with approved shop drawings to be prepared by the Contractor. a.
The Contractor shall provide and neatly erect all sheet metal work as may be required to carry out the intent of these Specifications and Drawings . The work shall meet with the approval of Owner’s site representative in all its parts and details.
b.
All necessary allowances and provisions shall be made by the Contractor for beams, pipes, or other obstructions in the building, whether or not the same are shown on the Drawings. Where necessary to avoid beams or other structural work, plumbing or other pipes, and conduits, the ducts shall be transformed, divided or curved to one side (the required area being maintained) all as per the site requirements.
c.
If a duct cannot be run as shown on the Drawings, the Contractor shall install the duct between the required points by any path available, in accordance with other services and as per approval of Owner’s site representative.
d.
All duct work shall be independently supported from building construction. All horizontal ducts shall be rigidly and securely supported, in an approved manner, with trapeze hangers formed of galvanized steel rods and galvanized steel angle/channel under ducts at no greater than 2 meter centre.
e.
Ducting over furred ceiling shall be supported from the slab above, or from trusses, after obtaining approval of Owner’s site representative. In no case shall any duct be supported from false ceiling hangers or be permitted to rest on false ceiling. All metal work in dead or furred down spaces shall be erected in time to occasion no delay to other Contractor’s work in the building.
f.
Where ducts pass through brick or masonry openings, it shall be provided with 25 mm thick TF quality expanded polystyrene around the duct and totally covered with fire sealant such as fire barrier mortar for complete sealing.
g.
6.5
6.6
All ducts shall be totally free from vibration under all conditions of operation. Whenever duct work is connected to fans, air handling units or blower coil units that may cause vibration in the ducts, ducts shall be provided with a flexible connection, located at the unit discharge. Flexible connections shall be constructed of flame retardant, water proof, silicon rubber impregnated flexible connection atleast 10 cm long securely bonded and flange bolted on both sides. Sleeve shall be made smooth and the connecting duct work rigidly held by independent supports on both sides of the flexible connection. The flexible connection shall be suitable for pressure at the point of installation.
DAMPERS a.
Dampers : All duct dampers shall be opposed blade louver dampers of robust 16 G GSS construction and tight fitting. The design, method of handling and control shall be suitable for the location and service required.
b.
Dampers shall be provided with suitable links levers and quadrants as required for their proper operation. Control or setting device shall be made robust, easily operable and accessible through suitable access door in the duct. Every damper shall have an indicating device clearly showing the damper position at all times.
c.
Dampers shall be placed in ducts at every branch supply or return air duct connection, whether or not indicated on the Drawings, for the proper volume control and balancing of the air distribution system.
MEASUREMENTS FOR DUCTING Unless otherwise specified, measurements for ducting for the project shall be on the basis of centre-line measurements described herewith : a.
Duct Work shall be measured on the basis of external surface area of ducts. Duct measurements shall be taken before application of the insulation. The external surface area shall be calculated by measuring the perimeter comprising overall width and depth, including the corner joints, in the centre of each duct section, multiplying with the overall length from flange face to flange face of each duct section and adding up areas of all duct sections. Plenums shall also be measured in similar manner. For tapered rectangular ducts, the average width and depth shall be considered for perimeter, whereas for tapered circular ducts, the diameter of the section midway between large and small diameter shall be adopted, the length of tapered duct section shall be the centre line distance between the flanges of the duct section. For special pieces like bends, tees, reducers, branches and collars, mode of measurement shall be identical to that described above using the length along the centre line. The quoted unit rate for external surface of ducts shall include all wastage allowances, flanges and gaskets for joints, nuts and bolts, hangers and angles with double nuts for supports, rubber strip 3 mm thick between duct and support, vibration isolator suspension where specified or required, inspection chamber / access panel, splitter damper with quadrant and lever for position indication, turning vanes, straightening vanes, and all other accessories required to complete the duct installation as per the Specifications. These accessories shall NOT be separately measured nor paid for.
b.
6.7
Special Items for Air Distribution shall be measured by the cross-section area perpendicular to air flow, as identified herewith : i.
Fire dampers - shall be measured by their cross sectional area perpendicular to the direction of air flow. Quoted rates shall include the necessary collars and flanges for mounting, inspection pieces with access door, electrical actuators and panel. No special allowance shall be payable for extension of cross section outside the air stream.
ii.
Flexible connection - shall be measured by their cross sectional area perpendicular to the direction of air flow. Quoted rates shall include the necessary mounting arrangement, flanges, nuts and bolts and treated-for-fire requisite length of canvas cloth.
TESTING AND BALANCING After the installation of the entire air distribution system is completed in all respects, all ducts shall be tested for air leaks by visual inspection. The entire air distribution system shall be balanced using an anemometer. Measured air quantities at fan discharge and at various outlets shall be identical to or less/excess than 5 percent in excess of those specified and quoted. Branch duct adjustments shall be permanently marked after air balancing is completed so that these can be restored to their correct position if disturbed at any time. Complete air balance report shall be submitted for scrutiny and approval, and four copies of the approved balance report shall be provided with completion documents.
7.
INSULATION
7.1
SCOPE The scope of this section comprises the supply conforming to these specifications.
7.2
and application of insulation
MATERIAL Thermal insulation material for Duct & Pipe insulation shall be closed cell Elastomeric Nitrile Rubber of Thermal conductivity of the insulation material shall o 2 o not exceed 0.038 W/m K or 0.212 BTU / (Hr-ft - F/inch) at an average temperature o 3 of 30 C. Density of the nitrile rubber shall be 40-60 Kg/m . The product shall have o o temperature range of –40 C to 105 C. The insulation material shall be fire rated for Class 0 as per BS 476 Part 6 : 1989 for fire propagation test and for Class 1 as per BS 476 Part 7, 1987 for surface spread of flame test. Water vapour permeability shall be -14 not less than 0.024 perm inch (2.48 x 10 Kg/m.s.Pa i.e. µ>7000: Water vapour diffusion resistance).
7.3
PIPING INSULATION All refrigerant, and condensate drain piping shall be insulated in the manner specified herein. Split units refrigerant piping insulation thickness shall be strictly as per manufacturers recommendations. Before applying insulation, all pipe shall be brushed and cleaned. Insulating material in tube form shall be sleeved on the pipes. On piping, slit opened tube from insulating material shall be placed over the pipe and adhesive shall be applied as suggested by the manufacturer. Adhesive must be
allowed to tack dry and then press surface firmly together starting from butt end and working towards centre. Wherever flat sheets shall be used it shall be cut out in correct dimension using correct tools. Scissors or Hacksaw-blade shall not be allowed. All longitudinal and transverse joints shall be sealed as per manufacturer recommendations. The adhesive shall be strictly as recommended by the manufacturer. The insulation shall be continuous over the entire run of piping, fittings and valves. Manufacturer’s installation manual shall be submitted and followed for full compliance. All insulation work shall be carried out by skilled workmen specially trained in this kind of work. . 7.4
PROTECTIVE COATING OVER INSULATION To provide mechanical strength and protection from damage all pipe / duct insulated with nitrile rubber as indicated in BOQ shall be covered with fibreglass fabric of 7 mil minimum thickness or self adhesive fibre glass cloth of 7 mil. thickness.
7.5
UNDERDECK INSULATION Underdeck insulation shall be 50mm thick TF Quality expanded polystyrene (32 3 Kg/m ) or 30mm thick phenotherm. Underdeck surface of ceiling shall be cleaned and made dirt free. Insulation panels shall be pasted on this surface with black CPRX compound. 28g wire net shall be tightened around insulation so as to avoid any kind of sagging. Ends of net shall be overlapping by at least 25mm. Overlaps shall be screwed with galvanized screws to avoid rusting.
COOLING TEST REPORT (SPLIT UNITS)
PROJECT __________________________________________________________________________________ COIL DATA
COIL NO.
COIL NO.
COIL NO.
DESIG N
DESIG N
COIL NO.
System Number Location Coil Type No. Rows Fins/In Manufacturer Model Number Face Area, Sq.Ft. TEST DATA
DESIG N
ACTUA L
ACTUA L
Air Qty. CFM Air Vel.FPM Press.Drop In. Out.Air DB/WB Ret. Air DB/WB Ent.Air DB/WB Lvg.Air DB/WB Air AT Waer flow. GPM Press.Drop.PSI Ent.Water Temp Lvg .Water Temp REF. AT Exp.Valve/Refri g Refrig.Suction Pr. Refrig.Suct.Tem p Inlet Steam press. REMARKS. TEST DATE ________________________________ ___________________________
READINGS BY
ACTU AL
DESIG N
ACTUA L
FAN TEST REPORT
PROJECT_________________________________________________________________________
FAN DATA
FAN NO.
FAN NO.
FAN NO.
Location Service Manufacturer Model No. Serial No. Type / Class Motor Make / Style Motor H.P/RPM/ Frame Volts/Phase/Cycles F.L Amps. Motor pully Diam./Bore Fan pully Diam./Bore No. Belts/ Make/Size Pully Distance. TEST DATA
DESIG N
ACTUA L
DESIG N
ACTUA L
CFM FAN RPM S.P IN/OUT TOTAL S.P Voltage Amperage
1
2 2 3 T T 3 1
T1 T2 T3
REMARKS:
TEST DATE:_________________________________ READINGS BY _____________________
DESIG N
ACTUA L
PPENDIX - II LIST OF APPROVED MAKES FOR EQUIPMENT & MATERIALS (As Listed Alphabetically) S.No.
Details of Materials / Equipment
Manufacturer’s Name
1.
Split Units / Package Unit
Blue Star Carrier (only Split AC unit) ETA Voltas
2.
Centrifugal Fan
Chaysol Comefri Kruger ebm-Nadi Nicotra
3.
Axial Flow Fan
Kruger Nuaire Systemair ebm-Nadi Nicotra
4..
Inline / Propeller Fan / Roof extractor Fan
Chaysol Nuaire Systemair Alstom ebm-Nadi
5.
GI Sheet
ESSAR Jindal SAIL TATA Lloyd
6.
Smoke / Fire/ Volume control Damper
Gryfit Ruskin Airmaster Caryaire Conaire George Rao Ravistar
7.
Anchor Fastener
Fischer Hilti SHAKTI
8
Thermal Insulation: Closed Cell Elastomeric nitrile rubber along with adhesive
S.No.
Details of Materials / Equipment
Armacell - Armaflex K-Flex A-Flex
Manufacturer’s Name
9.
Acoustic insulation: Fibre glass
Owens Corning UP Twiga
10.
Expanded Polystyrene (TF Quality)
Beardsell Coolite DEBS Products Styrene Packaging Tosiba
11.
Protective Coating over Closed Cell Elastomeric – Fibreglass Woven Cloth
Armacell Armachek Paramount UP Twiga
12.
Fire Sealant
BTHM Engineering Birla 3 M Hilti Promat
