Hvac Specifications

8/22/2019 Hvac Specifications

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HVAC SYSTEM TENDER SPECIFICATION


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CONTENTS

SECTION DESCRIPTION PAGE NOS

1 GENERAL SCOPE OF WORKS 3-4

2 DESIGN DATA 4-4

3 DX DUCTABLE SPLIT UNITS 5-6

4 SHEET METAL WORKS 6-18

5 DAMPERS 19-19

6 DIFFUSERS 20-21

7 DUCTING INSULATION 22-24

8 MEASUREMENTS 25-26

9 TESTING AND BALANCING 27-35

10 SERVICE AND MAINTENANCE 36-40

11 TESTS 41-41

12 COMMISSIONING REPORT 42-42

13 APPROVED MAKES 43-43

14 LIST OF TENDER DRAWINGS 44-45

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SECTION: 1

GENERAL SCOPE OF WORKS

The works covered by this specification consists of supply, delivery, unloading at site,

installation, testing, commissioning of the Air Conditioning equipment as outlined in thefollowing pages.

a. Supply, Installation, testing and commissioning of FOUR ( 4 ) 8.75 TR DXceiling suspended ductable split unit complete with all accessories tocapacities shown on the Drawings or Schedules of equipment.

b. Co ordination for installation of Air Distribution System complete withfactory fabricated G.S.S. Ducting insulated acoustically and thermally G.I. /

Aluminum Volume Control Dampers, Supply air and Return air Diffusers, to

sizes shown on the Drawing or Schedule of materials.

c. Testing, Balancing and Commissioning of the entire ACMV installation andsubmission of duly filled up all testing, balancing and commissioning reports.

d. Technical Data Sheets of all equipment, materials and Samples shall besubmitted for Consultants for approval prior to installation works.

Shop drawings and descriptive technical brochures for all equipment shall besubmitted for review by the Consultant prior to fabrication and installation works.The drawings shall include but not limited to detail room layouts, riser, floor and

wall penetration details, builder's work requirements, bracket spacing, details of

installation and dimensions, weights, control panel schematic and layouts and allother information related to the ACMV contractor's works.

The ACMV Contractor shall provide all other information needed to completerelated works by the Main Contractor and other sub-contractors. Relevant shop

drawings and details shall be submitted to the Main Contractor and approval

obtained for purposes of co-ordination with other trades.

The ACMV Contractor shall carry out any other incidental works or supply andinstall accessories not specifically mentioned but considered necessary to bring the

whole installation to proper and satisfactory working order. All other accessoriesrequired to comply fully with Local Authority Regulation/Requirements shall also be

supplied and installed. No additional claims will be allowed if the ACMV Contractor

fails to include these items in the tender, or Summary of Price Schedules.

Submission of Six (6) hard-bound copies of Operation and Maintenance Manualscomplete with as-built drawings.

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Standards and codes

SL NO STANDARD DESCRIPTION

1 ASHRAE Standards for System and Equipment

2 ASHRAE 52 Air Cleaning Devices Used in General Ventilation forRemoving Particulate Matter

3 NFPA 90 A Installation of Air Conditioning and Ventilation

Systems

4 UL Underwriters Laboratories.

5 ARI Cooling Coil ratings/Chiller

6 AMCA Fans

7 NEMA- 250 Enclosures for Electrical Equipment

8 NFPA 70 National Electric Code

9 NFPA 75 Protection of Electronic computer/ DPU

10 ASME SEC 8 D Boliers and Pressure Vessel codes Rules for

construction of pressure Vessels.

11 BSRIA AG 1 / 2001.1 Pre Commission Cleaning of Pipe Works Systems

(2ND EDITION)

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SECTION: 2

DESING DATA

SL.

NOLAB NAME INSIDE CONDITION

SYSTEM

TYPEVENTILATION TYPE

Temp in

Deg

RH in

%

1 GF / Research Lab 241 605 CAV Recirculation Air

2 FF / Chemistry Lab 1 241 605 CAV Recirculation Air

3 FF / Chemistry Lab 2 241 605 CAV Recirculation Air

4 SF / MSc Lab 241 605 CAV Recirculation Air

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SECTION: 3

AIR COOLED DX DUCTABLE SPLIT UNIT

General

The Air cooled SPLITS shall be with hermetic type scroll compressor of minimum capacity

and performance as indicated in the schedule and /or as shown on the drawings.

Each unit shall be completely factory assembled, piped, wired and tested and shall comprise

of multiple scroll compressor, starter for compressors, condenser fans, Insulated cooler, air

cooled condenser with microprocessor control panel.

The split shall utilize a non-chlorofluorocarbon (CFC) refrigerant, R-134A/R22.

CASINGS

The unit shall consist of galvanized steel cabinet mounted on a frame, the whole of which

shall be rust proofed and finished with a scratched-resistant and wear resistant baked onenamel so as to resist marine environment corrosion.

Removable panels shall be provided to enable all maintenance and repairs to be

carried out without removal of the unit or structural alteration to prevent rattles andlooseness after prolonged period of operation.

The inside of the cabinet (where the compressor is located) shall be insulated with 2"

(50 mm) thick high density fiberglass or rock wool or as per manufacturers standard.

The nuts and bolts shall be treated with anti rust and coat with rust proof paint.

Mild Steel Bolts and Nuts are NOT ACCEPTABLE.

COMPRESSORS

The air cooled chiller shall be fitted with two or more screw compressors of the semi-

hermetic type. In either case, the availability of spare parts shall be assured.

The compressors shall be driven by electric motors designed for operation on 415

6% volts, 50 cycles and three-phase. Compressors motors shall be cooled with suction gas

or other approved means.

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The compressors and motors shall be fully protected against abnormal operatingconditions by high and low pressure switches, thermal relays, overload relays and safety

controls and Phase Failure fuses.

The compressors shall be fitted with gauge connections for reading oil, suction and

discharge pressures and shall be fitted with a sight glass, crankcase heater, muffler,discharge manifold and internal motor protection.

The capacity Control shall be step less control by use of a slide valve or step control

by use of solenoid valves.

The compressors shall be mounted on spring vibration isolators.

Compressors should be provided with acoustic jacket for sound attenuation from the

factory. Field assembly is not acceptable.

CONDENSERS

The condenser shall be of the air cooled cross-finned type with copper tube type to suit the

capacity of the unit. Bonding of the fins to the tubes shall be by mechanical means to ensurea positive lasting bond.

The condenser fan shall be the propeller type Low noise fans Please state noise criteria.

This is a statically and dynamically balanced and shall be mounted on a solid steel shaftrunning in self-aligning ball bearings, amply sized for quiet operation and long life. The

condenser fan shall be driven directly by resiliently mounted squirrel cage induction motor

with adequate horsepower for the duty.

Condenser Coil fins to be coated against corrosion.

UNIT CONTROL PANEL

Each machine shall be furnished with a complete control centre in an enclosure,

factory mounted, piped and wired. The capacity, operating and safety controls sequences

shall be designed for completely fail safe, automatic operation. The control sequence shallprovide for operation of oil heaters during normal shut down.

Provision shall be made in the control centre for inter-locking of compressor motor starter,chilled water pump. Machine shall also be fitted with no-load center and shall contain the

following in a weather proof compartment.

Safety controls shall be electric or electronic fully automatic and shall be fail safe.Machine shall shut down for oil low pressure, chilled water low temperature, refrigerant low

pressure, condenser high pressure, lubrication oil high and low temperature. Each shut down

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shall be indicated with light individually. Controls center should be fitted with remote alarmindicating terminals. Machine shall not restart until manually reset.

Machine shall be provided with start/stop, remote/local and reset switches.

Terminals strips shall be clearly marked for field wiring connections.

Incoming power will be provided at single point.

VIBRATION ISOLATION MOUNTING

The unit shall be supplied with adequate number of level adjusting spring type

isolation provided by the manufacturer.

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SECTION: 4

SHEET METAL WORK

Scope:

The scope of this section comprises supply fabrication, installation and testing of allsheet metal ducts.

Governing Standards

Unless otherwise specified here, the construction, erection, testing and performance of

the ducting system shall conform to the SMACNA 1995 Standards (HVAC Duct

Construction Standards Metal and Flexible Second Edition 1995 SMACNA )

Raw Material

Ducting

All ducting shall be fabricated of LFQ (Lock Forming Quality) grade primeG.I. raw material furnished with accompanying Mill Test Certificates.

Galvanizing shall be of 120 gms/ Sqmt. (Total coating on both sides) In addition, if deemed necessary, samples of raw material, selected at random

by PMCs site representative shall be subject to approval and tested for

thickness and zinc coating at contractors expense. G.I. raw material should be used in coil form (instead of sheets) so as to

limit the longitudinal joints at the edges only irrespective of cross-section

dimensions.

Duct Connectors and Accessories

All transverse duct connectors (flanges /cleats) and accessories / related hardware are such

as support system shall be zinc coated (galvanized).

FABRICATION STANDARDS

All ductwork including straight sections, tapers, elbows, branches, shoe pieces, collars,

terminal diffuse boxes and other transformation pieces must be factory fabricated

o Coil line to ensure location of longitudinal seams at corners / folded edges only toobtain the required duct rigidity and low leakage characteristics. No longitudinal

seams permitted along any face side of the duct.

o All ducts, transformation pieces and fittings to be made on CNC profile cutters forrequired accuracy of dimensions, location and dimensions of notches at the

folding lines.

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o All edges to be machine treated using lock formers, flanges and roller for turningup edges.

o Sealant dispensing equipment for applying built in sealant in Pittsburgh lockwhere sealing of longitudinal joints are specified.

SELECTION OF G.I. GAUGE AND TRANSVERSE CONNECTORS

Duct Construction shall be in compliance with 1 (250 Pa) w.g Static norms asper SMACNA.

All transverse connectors shall be 4 bolt slip on flange system with built-insealant.

The specific class of transverse connector and duct gauge for a given duct

dimension will be as per Table 1 below for 1 (250 Pa) pressure class. Non toxic, AC applications grade P.E. or PVC Gaskets are required in

between all mating flanged joints. Gasket sizes should conform to flange duct

manufacturers specification.

Table 1:

Article I. STANDARDS

FOR SELECTION OF ROLAMATE OR APPROVED EQUIVALENTFLANGE CLASS AND DUCT GAUGES AT 1200 MM SPACING

Duct Pressure in Inches / (Pascals)Duct

Dimension 1"(250)

*5

2"(500) 3"(750) 4"(1000

)

6"(1500)*4

10"(2500)

(in mm) Reinforcement Class - Duct Gauge

upto 250 *3E-24 E-24 E-24 E-24 E-24 E-24

251-300 E-24 E-24 E-24 E-24 E-24

301-350 E-24 E-24 E-24 E-24 E-24 E-22

351-400 E-24 E-24 E-24 E-24 E-24 E-22

401-450 E-24 E-24 E-24 E-24 H-20

451-500 E-24 E-24 E-24 E-24 E-24 H-20501-550 E-24 E-24 E-24 E-24 H-24 H-20

551-600 E-24 E-24 E-24 E-24 H-22 H-20

601-650 E-24 E-24 E-24 E-24 H-22 H-20

651-700*2

E-24 E-24 E-24 H-24 H-22 H-18

701-750 E-24 E-24 E-24 H-24 H-22 J-18

751-900 E-24 E-24 H-22 H-22 H-20 J-18

901-1000 E-24 H-24 H-22 H-20 J-18 J-16

10 01-1200 E-24 H-22 H-20 J-18 J-18

12 01-1300 *3H-24 H-20 J-18 J-18 J-16

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13 01-1500 H-24 J-18 J-16

15 01-1800 H-22 J-18 J-16

18 01-2100 *3J-20 *

3J-20

2101-2400 J-18

2401-2700 J-18

Notes:

*1- SMACNA- Sheet Metal and Air conditioning Contractors National Association Inc-

HVAC Duct Construction Standards- Metal and Flexible-1995, U.S.A.

*2- Reading Guide- For duct sizes between, say, 651 mm and 700 mm, when thepressure class is 1 w.g. static, require aE class flange and duct gauge of 24. For

the same size range but with static pressure at 4 w.g. a H class flange with duct

gauge of 24 should be used.

*3- The flange classes are designated E, H and J. For E & H class of flanges use gasketsize 10 mm wide and 4.5 mm thick. For J-class use 15 mm wide and 6 mm thick

gasket.*4- For pressure class 6 w.g. static and above gasket type and size shall be as per

manufacturers recommendation.

*5- (Not Applicable for Current Specifications) for non-critical comfort cooling

applications (1 w.g. pressure class), optional C & S or C & SS cleat joints

can be used.

Upto 450 mm duct size use C & S cleats.451 to 750 mm duct size use C & SS cleats.

Over 750 mm duct size use flanges.9 A higher class flange can always be substituted for a lower class (e.g. classJ for

classH, classH for class E).

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DUCT CONSTRUCTIONo The fabricated duct dimensions should be as per approved drawings and all

connecting sections are dimensionally matched to avoid any gaps.

o Dimensional Tolerances: All fabricated dimensions will be within +/- 1.0mm ofspecified dimension. To obtain required perpendicularity, permissible diagonal

tolerances shall be +/- 1.0 mm per meter.

6.3 Each and every duct pieces should be identified by colour coded sticker whichshows specific part numbers, job name, drawing number, duct sizes and gauge.

o Ducts shall be straight and smooth on the inside. Longitudinal seams shall beAirtight and at corners only, which shall be either Pittsburgh or Snap Button Punch

as SMACNA practice, to ensure air tightness.

6.5 Changes in dimensions and shape of ducts shall be gradual (between 1:4 and1:7). Turning vanes or air splitters shall be installed in all bends and duct collars

designed to permit the air to make the turn without appreciable turbulence.

o Plenums shall be factory fabricated panel type and assembled at site. To besupplied along with Air Handling Units by AHU supplier only.

o The deflection of transverse joints should be within specified limit forrectangular duct deflection as given in SMACNA. Page No. 7.6.

o Reinforcement of ducts shall be achieved by either cross breaking or straightbeading depending on length of ducts.

As per SMACNA page no. 1. 74, fig 1-8

Duct sizes 19 (483 mm) wide and larger which have more than 10 Sqft. ofunbraced panel shall be beaded or cross broken unless ducts will have insulation

covering or acoustical liner. This requirement is applicable to 20 G (1.00 mm) orless and 3 W.G. (750 Pa) pressure or less. Ducts for 4 W.G. (1000 Pa) or more

do not require beads or cross brackets.

SUPPORT SYSTEMA completely galvanized system consisting of fully threaded rods, double L bottom

brackets (made out of 3.0 mm M.S. sheet) nuts, Washers and anchor bolts as supplied by

Rolaster or approved equivalent or generally conforming to SMACNA standards should be

used.

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Table 3 Support for Horizontal duct-Rectangular

Sr.

No.

Maximum

Duct

Size(mm)

Hanger

Rod Diameter

Interval

(mm)

1 Upto - 700 6 mm 2400

2 701 - 1200 8 mm 2400

3 1201 - 2000 10 mm 2400

4 Above 2000 12 mm 2400

o As an alternative, slotted galvanized brackets attached to the top two bolts of thesystem may also be used as appropriate for the site condition.

o To provide the required thermal brake effect, Neoprene or equivalent material ofsuitable thickness shall be used between duct supports and duct profiles in all supply

air ducts not enclosed by return air plenums.

INSTALLATION

Tools and tackles for site work

The duct installation shall confirm to SMACNA norms. For duct assembly andInstallation the use of suitable tools and tackles should be used to give the required duct

quality and speed of installation including (but not restricted to)

a) Electric Pittsburgh Seamer used for closing Pittsburgh joints.b) Electric Slitting shear to make cut outs.

c) Drilling machine with drill bits for drilling holes in sheet metal work.

d) Hammer drill machine with drill bits for drilling holes in building structuresfor anchors.

e) Hoisting system for lifting the duct assembly upto mounting heights.

Installation Practice

All ducts shall be installed as per tender drawings and in strict accordance with

approved shop drawing to be prepared by the Contractor. 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

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work shall meet with the approval of Consultants and PMCs siterepresentative in all its parts and details.

All necessary allowances and provision shall be made by the Contactor forbeams, pipes, or other obstructions in the building whether or not the same

are shown on the drawings. Where there is interference/ fouling with other

beams, structural work, plumbing and conduits, the ducts shall be suitably asper actual site conditions.

8.2.3 Ducting over false ceiling shall be supported from the slab above, orfrom beams. In no case shall any duct be supported from false ceilingshangers 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

contractors work in the building. Where ducts pass through brick or masonry openings, it shall be provided

with 25 mm thick appropriate insulation around the duct and totally covered

with fire barrio mortar for complete sealing. All ducts shall be totally free from vibration under all conditions of

operation. Whenever ductwork is connected to fans, air handling units that

may cause vibration in the ducts, ducts shall be provided with a flexibleconnection, located at the unit discharge.

DOCUMENTATION & MEASUREMENT OF DUCTING

All ducts fabricated and installed should be accompanied and supported by

following documentation:

o For each drawing, all supply of ductwork must be accompanied bycomputer generated detailed bill of materials indicating all relevant duct

sizes, dimensions and quantities. In addition, summary sheets are also to beprovided showing duct area by gauge and duct size range as applicable.

o Measurement sheet covering each fabricated duct piece showing dimensionsand external surface area along with summary of external surface area of duct

gauge-wise.

o All duct pieces to have a part number, which should correspond to the serialnumber, assigned to it in the measurement sheet. The above system will

ensure speedy and proper site measurement, verification and approvals.

TESTING

After duct installation, a part of duct section (approximately 5 % of total ductwork)

may be selected at random and tested for leakage. The procedure for leak testing

should be followed as per SMACNA HVAC Air Duct Leakage Test Manual(First Edition)

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i. DUCTWORK LEAKAGE TESTS

Type

All ductwork shall be pressure tested for leakage, smoke test is notacceptable.

The Sub-contractor shall provide the necessary test equipment and skilledlabour

To carry out the tests satisfactorily.

Tests shall be witnessed and certified by the Consultant or his representative.

Prior to witness of final tests, the sub-contractor shall carry out preliminarytests to ensure the test results are within specified limits.

All ductwork shall be tested for leakage without duct insulation or ductenclosure at the joints.

Accuracy of the test apparatus shall be within:

(i) 5% of the indicated flow rate or 0.4 I/s, whichever is greater, and(ii) 5% of the indicated static pressure in duct under test.

The test apparatus shall have a calibration certificate, chart or graph dated not

earlier than one year before the test for which it is used.

ii. Procedure

The section of ductwork to be tested for air leakage shall be sealed. Mainducts shall be provided with flanged joints to enable blanking plates to befitted, while small open ends may be sealed with polythene or inflatable bags,

which shall be left in position until final connections, are made.

The section of ductwork to be tested shall have an area large enough toenable the test equipment to register a measurable leakage.

Complete Parts 1, 2 and 3 of the TEST SHEET, sample appended in Item 7.Connect test apparatus to section of ductwork to be tested.

Adjust test apparatus until the static pressure differential is obtained.

The test pressure shall be 1.5 times the working pressure.

Check that the measured leakage is within the permitted rate.

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Maintain the test for fifteen (15) minutes and check that the leakage rate hasnot

increased.

Reduce pressure in ductwork to zero by switching off the fan, thenimmediately reapply test pressure to establish that the air leakage rate is not

greater than previous reading.

Record details on Part 4 of the TEST SHEET.

Re-testing

The air leakage rate for any section of ductwork shall not be in excess of the

permitted rate for that section. If the first test produces leakage in excess of the

permitted maximum the section shall be resealed and re-tested until a leakage not

greater than the permitted maximum for that section is achieved.

iii. Certified Tests

When satisfied with the results of the above preliminary tests the sub-contractor

shall make arrangement to carry out the final tests which shall be conducted in thepresence of the Consultant or his representative. Test particulars shall be recorded

in Part 4 of the TEST SHEET and signed by the Consultant or his representative.

iv. Duct Area Estimation

The surface area of the section of the ductwork under test shall be estimated.

Details of the estimation shall accompany the TEST SHEET in the following

format:

Width

and

Depth

( mm )

Periphery

( mm )

Length

( mm )

Area

( Square

Meters )

Total

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Leakage Factor Table (As per SMACNA STANDARDS)

The leakage factor is determined by the specified Pressure Classification and Test

Static Pressure. It is used to compute the maximum permitted leakage bymultiplying it by the estimated duct area.

Static Maximum Leakage Per Sq.Meter Duct Work in l / s

High PressurePress Diff ( Pa ) Low PressClass A

Med PressureClass B Class C Class D

100 0.54 0.18

200 0.84 0.28

300 1.10 0.37

400 1.32 0.44500 1.53 0.51

600 0.58 0.19

700 0.64 0.21

800 0.69 0.23

900 0.75 0.25

1000 0.80 0.27

Ductwork Leakage Test Sheet Ref.No: ......................

Project title: ____________________________________________

Building ref: ____________________________________________

Part 1 Specified

(i) Pressure Classification: ________________________________

(ii) Test static pressure: ________________________________

Part 2 - Physical details

(i) Section of ductwork: _________________________________

(ii) Drawing ref: _________________________________

(iii) Leakage factor: _________________________________

(iv) Surface area of duct : _________________________________

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(v) Max permitted leakage: _________________________________

Part 3 - Test equipment

(i) Manufacturer: _________________________________

(ii) Type of model: _________________________________

(iii) Range of flow at test static pressure ___________________________

Part 4 - Test results

(i) Duct static pressure: _________________________________

(ii) Reading of flow measuring device: ___________________________

(iii) Interpreted air flow leakage rate: ___________________________

(iv) Duration of test (normally 15 min.): ___________________________

Conducted by __________________________________

Date of test __________________________________

Witnessed by __________________________________

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SECTION: 5

DAMPERS

Scope

Volume damper sets shall be provided where specified and/or as shown on thedrawings.

Type

o Manually adjustable damper sets - opposed blade type.o Manually adjustable dampers at duct branch takeoffs - opposed blade type.

o Manually adjustable dampers at air outlets and grilles - opposed blade type.

o All components of the damper set, including rod linkage and joints shall berust-proof finished.

Manually Adjustable Damper Sets - Opposed Blade Type

Damper sets shall be arranged in substantial supporting frames and each blade shallbe mounted on a 12mm (1/2) shaft, which turns in sintered bronze bearings. All

damper blades shall be inter-connected by means of a suitable bar linkage for ganged

operation.

All dampers shall be arranged with spindle horizontal and shall be sized to handlethe air quantities shown on the drawings. The maximum blade width shall not

exceed 250mm (10) and the length 1200mm (48).

The maximum overall dimensions of any damper section shall not be greater than2300mm (90) high or 1200mm (48) wide. Where manually adjustable damper setsare installed in ductwork or other accessible locations the operating shafts shall be

extended through the duct and a lockable quadrant fitted.

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SECTION: 6

DIFFUSERS

General

o Diffusers and other air terminal fittings shall be of the types, sizes, numbers andpositions as shown on the drawings and/or specified hereafter. The ceiling

arrangement, type of suspension system, and type of air terminal fitting shall be

checked with the Consultants and Architects prior to ordering of equipment.

o Engineering data shall be submitted in a manner to facilitate convenient review of

the following factors:o Aspiration ability, including temperature and velocity traverses, throw and drop of

each unit, noise criteria ratings for each unit, sizes, free area and quality of

construction.

o Each air supply outlet shall have the required capacity and shall be guaranteed togive the required draft with draft less diffusion. Where manufacturers

recommendations require duct size differing from those on the drawings, the same

shall be provided at no additional cost to the Client.

o Opposed blade Volume control dampers shall be provided for all diffusers.

o Single blade stream splitter type volume controls shall be provided as shown on the

drawings at the duct branch takeoffs to individual outlets in which case DiffuserVolume Control (DVC) and/or Opposed Blade Damper (OBD) throttling dampers

are not required behind the outlet.

o Multi blade DVC stream splitter volume controls shall be provided behind registersmounted on the side of ductwork and at spigot takeoffs from duct branches servingmore than one outlet.

o OBD volume controllers shall be provided behind all return air face exhaust airgrilles to give even air flow over the face of the grilles. Diffusers or registers which

do not have multi-blade DVC dampers, and which have spigot connections between

the duct and the outlet of less length than the larger neck dimension of the diffuser or

register, shall be fitted with equalising deflection grids to ensure even air distributionfrom the outlet.

o All volume controls where mounted behind grilles, registers and diffusers shall befinished in matt black paint.

Where spiral duct connections are provided to ceiling diffusers with air quantitiesmore than 350 cfm, they shall be supplied with a plenum box incorporating turningvanes as necessary to give even distribution of air through the neck of the diffuser.

All diffusers, grilles and registers shall have performance data tested in accordancewith the Air Diffusion Council (ADC) Code 1062: GRD-84 and ASHRAE

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Standard70-72. Diffusers without ADC and ASHRAE test performance data shallnot be accepted. The material used shall be of not less than 16 gauge aluminium

anodised. OBD and DVC dampers shall have blades linked together in sections for

ganged operation from adjusting screws. Where OBD or DVC dampers are mounted

on the back of outlets or grilles the screw shall be accessible through the blades of

the outlet. Where the OBD or DVC damper is mounted in the duct spigot backfrom the outlet, then the screw adjustment shall be accessible through the removable

core of the diffuser or by removing the register or grade.

DVC dampers shall give volume control and even air distribution over the full faceof the outlet without the introduction of noise.

DVC dampers shall have a sheet metal frame enclosure around the blades to givereasonable robust construction and to ensure all the air diverted by the blades is

directed through the outlet.

Ceiling Diffusers

Supply air Diffusers (Square)

The whole diffuser assembly shall be constructed of aluminium. The diffuser shallconsist of an outer frame assembly to facilitate mounting. A collar that followsconnection to the air-conditioning duct shall be an integral part of the frame

assembly. An inner core assembly consisting of fixed louvers capable of producing

there required air flow discharge pattern shall be easily and fully removable from the

installed diffuser frame for access dampers or other ductwork components located inor near the diffuser neck. The inner core shall be held securely in position by means

of spring-loaded pins.

The outer frame of the diffuser shall have a number of optional styles, flange forflush mounting on ceiling surface, recessed to enable flush mounting with ceiling

tiles, recessed with clip-fixed detail or lay-in T Bar. Double flap or opposed blade

volume control dampers mounted on the rear of the diffuser shall be provided.

The finishing shall be anodized aluminium or baked enamel of colour to Architects

selection. Diffuser shall have a high induction ratio capable of maintaining airdistribution pattern without dumping from full flow down to 20% of full flow.

Bird screens

Galvanised woven mesh or weld mesh bird screens in rigid galvanised iron frames shall beinstalled behind all external louvers and over all relief and exhaust air openings to the

outside of the building.

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SECTION: 7

DUCT INSULATION

Scope

o The supply and return air ductwork shall be provided with insulating materialscomplying with the technical data specified herein.

o Insulation deviating from the specification shall only be offered as an alternative.

Full technical data and specification in respect of the insulation offered shall besubmitted with the tender.

CLOSED CELL ELASTOMERIC FOAM INSULATION

Material: The insulation used shall be flexible closed cell elastomeric foam with the

following requirements:

1. Thermal conductivity ( )BS 874 Part 2 86 ( DIN 52613, 52612 )

-20 C < 0.032 W/mK

0 C < 0.034 W/mK+20 C < 0.036 W/mK

Thermal conductivity values shall be governed by a third party supervisory controlagreement which shall be for attestation of conformity purpose.

2. Water Vapour Diffusion Resistant () DIN 53122 Part 2, DIN 52615 > 7000

3. Water vapour permeability 0.09 ugm / Nh, BS4370/24. Density 45 to 65 Kg. m3 or 3 lb / ft3 to 4 lb / ft3.

5. Closed cell content > 90%

6. Fire Rating:BS 476 Part 6 1989 (Fire Propagation): Class O rated.

BS 476 Part 7 1987 (Surface spread of flame): Class I rated.

7. Corrosion risk assessment DIN 1988 / 7 certified.Material should be nitrite free and can contain no more that 0.2 % of ammonia.Insulating material for stainless steel must contain no more than 0.05 % of water soluble

chloride ions.

8 Noise reduction DIN 4109 upto 32 dB( A )

9 Manufacturer should be certified in accordance with ISO 9002 / UNI EN 29002 whichincludes production control procedures and systems as a pre-requisite.

10 All tests should be conducted by independent, accredited institutes and the supervisory

(third party) control agreements should be available for attestation of conformity

purposes.

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11 The insulation labourers shall be trained by the manufacturers local agents beforecommencement of works. The manufacturers local agents shall visit the site

periodically to inspect the insulation work.

12 The insulation thickness shall be as follows:

12.1 Supply air ducts, return air ducts, transfer duct etc. within the building and in the

return air path (i.e. all ducts in conditioned areas) to be 9 mm thickness.

(thermal)

12.2 Supply, air ducts, return air ducts, transfer ducts within the building and in thereturn air path (i.e. All ducts in conditioned areas) to be 15mm thickness

(acoustical)

12.3 All ducts outside the building or not in return air path (i.e. all ducts inunconditioned areas and in vertical service shaft to be 25 mm thickness.

(Exposed)

12.4 Note: In areas with non U.V. (inside the building) radiation no vapour barriers /

coatings are required.12.5 Protection against high U.V. light radiation, e.g. area exposed to sunlight, two

coats of Arm finish paint metal shall be used.

Method Statement for Application of Elastomeric Insulation on Ducts.

i) Clean area of duct to be insulated to make it dust free, apply thinner / cleaner

wherever necessary to make the area grease free.ii) Apply glue recommended by manufacturer with an even spread on complete surface

of insulation sheet.

Iii) Once the glue on the sheet gets dry, apply glue on the G.I. duct and let it dry, then

stick the sheet on one end and slowly press the sheet on the duct from one end to theother so as to ensure that the sheet sticks on the G.I. duct completely avoiding air

bubbles between the insulation sheet and G.I duct.

iv) In areas where the G.I. duct comes in contact with the duct hangers, rigid support is

recommended such as section of wood. The wood piece should be glued on to theduct hanger and a layer of rubber to be glued on the wood, so that there is no direct

contact between the duct insulation and the wooden piece thus preventing tearing of

the duct insulation. In case the positioning of the support is available in advance,wood by itself can be used. In this case it has to be made sure that the insulation will

be glued to the wood from both sides accordingly.

For proper wood thickness selection please contact manufacturers representative.

v) Method statement of application for outdoor usage:

Avoid working under direct sunlight and exposure of glued joints to sunlight for atleast 12 hrs after glue application as sunlight prevents proper curing. Prolonged

exposure of elastomeric foam to direct sunlight is not recommended as this will

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eventually result in deterioration of the surface. Do not keep the glue under directsunlight as this will result in rapid evaporation of the solvent and affects the

performance of the glue.

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SECTION: 8

MEASUREMENT

Scope

The following procedure for measurement shall be followed for the purpose of

billing in case of items subject to variation in quantities.

Ducting:

o Payment for ducting shall be on the basis of the external surface area of the ducting.

The rate per square meter of the external surface shall include flanges, gaskets forjoints, bolts and nuts, duct supports and hangers, vibration isolation pads or

suspenders, flexible connections, inspection doors, dampers, turning vanes,

straightening vanes, and any other item which will be required to complete the ductinstallation except external insulation and finish thereon.

The external area shall be calculated by measuring the over-all width and depth(including the corner joints) in the centre of the duct section and over-all length of

each duct section from flange face to flange face in case of duct lengths with uniform

cross section. Total area will be arrived at by adding up the areas of all ductsections.

In case of taper pieces average width and depth will be worked out as follows:

W1 = Width of small cross section

W2 = Width of large cross section

D1 = Depth of small cross section

D2 = Depth of large cross section

Average Width = W1 + W2

--------------

2

Average Depth = D1 + D2

-------------

2

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Width and depth in the case of taper pieces shall be measured at the edge of thecollar of the flange for duct/sections fitted with angle iron flanges: otherwise at the

bottom of the flange where the flanges are of GSS. Face to face length for taper

piece shall be the mean of the lengths measured face to face from the centre of width

and depth flanges.

o For special pieces like bends, branches, and tees, etc., the same principle of areameasurement as for linear lengths shall be adopted, except for bends and elbows, the

length of which shall be the average of the lengths of inner and outer periphery alongwith curvature of angle of the piece.

o Duct measurements for calculation of area shall be taken before application of

insulation.

Duct insulation:

The area of ducts to be insulated shall be measured before the application of insulation.

Payment will be made for the areas calculated directly from such measurements.

Cables:

Payment of LT armored cables shall be on the basis of linear measurements measured

from gland to gland. The rate shall include extra cables left in the panel. Measurements

will be taken as straight runs along the route. No claims for balance cable remainingafter the completion of work will be entertained. No joints in straight runs will be

permitted. The contractor has to take the actual measurement of the cable at site along

with approved route before procuring cables.

The rates quoted for the cables laid in the underground trenches shall include

excavation, sand cushioning, standard burnt brick protection, refilling, consolidating

etc., as per specifications.

No extra payment will be made for any miscellaneous work associated with cable

laying.

Cable End Termination:

The rate quoted for termination shall include copper lugs, brass compressed glands,

copper earth clamps for glands, taping, crimping, yellow paste, etc.,

Cable Trays:

Payment for Cable Trays shall be made on the basis of linear measurement. No extra

payment will be made for bends, offset pieces and other accessories like supports,clamps and grouting, etc. The cable tray shall be mounted as specified in relevant

specifications

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SECTION: 9

TESTING AND BALANCING

GENERAL

o All testing and balancing shall be made in the presence of the Engineer or hisrepresentative or other inspecting authority. Give not less than 7 days prior notice, in

writing, to these parties before making any tests.

Supply all necessary skilled labour, helpers, equipment and materials for tests,operating and adjusting the systems and for fully instructing the Employer or his

representatives in the operation of the system.

o Protect valves and equipment from damage during tests. Include connection topreviously tested sections, if the systems are tested in sections.

o Prior to the balancing procedure, operate all systems for at feast 16 consecutivehours or longer if required, to prove satisfactory automatic operation. If systems

shutdown is I experienced for any reason, repeat and test until 16 consecutive hours

are achieved. Operate equipment as recommended by the equipment manufacturersand in such a manner as to avoid damage to the work of other trades.

o Submit to the Consulting Engineers for review a log of all tests made which shallinclude time, temperature, pressure and other readings necessary to indicate that the

systems have been operated and tested as required by the Specification.

o Upon completion of testing and balancing submit six (6) copies of the recorded testdata for the Consulting Engineers evaluation and approval.

o Flow quantities for Air side, Chilled Water Systems shall be verified by theConsulting Engineers and Clients representatives before the report is submitted.

TESTING OF MEDIUM & LOW PRESSURE DUCTS

The Medium and Low Pressure ducts shall be tested for air leaks in accordance with the

below mentioned table under heading Duct work Leak Test.

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PRE BALANCE CHECKS AND START UP

The Air Systems will be checked out at specified below, and started and started up prior tobalancing.

a) Complete later pressure and duct pressure testing for leakage.

b) Complete all Punch List check items.

c) Install all dampers and other balancing devices as called for in the construction

documents and verify the same are properly installed, indexed and in good

working order.

d) Check all motor starters and verify that the heater sizing is correct, taking length

of electrical feeders into consideration. Record amp readings on all motors.e) Check out and align all equipment drives.

f) Set all fan sheaves to provide the indicated capacities at specified static pressures(RPM as specified).

g) Set all manual balancing dampers, valves and balancing valves at 100% openposition. Verify that all fire dampers are open.

h) All adjustable pitch pulleys shall be removed from the motor shaft. The shaft and

pulley threads shall be cleaned, lightly oiled, and pulley remounted, aligned and

properly adjusted.

i) Clean interior of all plenums, casings and ducts and install all filters before

starting systems.

j) Make sure all controls systems are calibrated and functioning properly.

k) Place all systems in automatic operation.

I) Operate systems for 16 consecutive hours without shutdown with all equipment

in perfect working order. Manufacturers representative must be present at initial

start- up all equipment.

m) Check fan and pump bearings for grease.

n) Install clean prefilters and install high efficiency filters in all systems prior

to starting air balance.

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o) Provide availability of personnel from all the related mechanical and controlscontractors during balancing.

TEST REPORTING FORMS

General

Test forms used for testing and balancing shall be set up to include the following

information. Each sheet shall have job name and address, name of air conditioning sub-

contractor, architect and engineer instruments used to perform tests, and name of testtechnician or test engineer. All forms shall be submitted in typewritten form. A minimum of

6 copies shall submitted. Test sheets shall be similar to those shown in.

Diffusers -Test Sheets

The tests shall be submitted in detail.

a) Fan Systems and/or zone number

b) Room number or area designation

c) Outlet code number which shall correspond to code number of outlet on airbalance code drawing.

d) Size of Outlet -manufacturers listed size.

e) Type of Outlet -per manufacturers model designation.

f) Manufacturer of Outlet

g) Manufacturers effective area for each size

h) Required m/s and required I/s of each outlet

i) Test resultant m/s and 1/s of each outlet

j) Final resultant m/s and 1/s of each outlet

Test, Code Drawings

Each Report shall contain a single line drawing of air distribution system with fan systemand zone number indicated. Each and every out/et, supply, and return shall be indicated on

this drawing by a number corresponding to the number on the outlet test sheet, enabling the

Engineer to locate each outlet for this drawing.

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Drawing shall be clear and neat and shall list name of job and location of same.

Temperature Test Sheets

Temperature test sheets shall list both specified and test conditions in opposite columns.

Items listed on this sheet shall be as follows:

a) Entering Air D.B. & W.B. Temperature

b) Leaving Air D.B. & W.B. Temperature

c) Entering Coil Water Temperature

d) Leaving Coil Water Temperature

e) Outside Air -D.B. & W.B. Temperature

f) Room temperature reading to be checked against thermostat setting

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AIR SIDE TESTING AND BALANCING

The Air System shall be tested and balanced as under:

a) Test and adjust fan RPM to design requirements

b) Test and record motor full load amperes.

c) Make Pitot tube traverse of main supply ducts and obtain design 1/s at fans.

d) Test and record system static pressures, suction discharge and total.

e) Test and adjust system for design 1/5 recirculated air.

f) Test and adjust system for design 11s outside air.

g) Test and record entering air temperatures DB/WB.

h) Test and record leaving air temperature DB/WB

i) Adjust all main supply and return air ducts to proper design 1/5.

j) Adjust all zones to proper design 1/s supply and return.

k) Test and adjust each diffuser to within 10% of design requirements:

I) Each diffuser shall be identified as to location and area.

m) Size, type and manufacturer of diffusers and all tested equipment shall be

identified and listed. Manufacturers ratings on all equipment shall be used to

make required calculations.

n) Readings and tests of diffusers shall include required velocity and test resultant

velocity. Required 1/5 and test resultant CFM after adjustments.

p) All diffusers shall be adjusted to minimize drafts in all areas.

q) As part of the work of this contract, the Contractor shall make any changes in the

pulleys and belts for correct balance as required at no additional cost to Owner.

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DUCTWORK LEAKAGE TESTS

General

o Specification describes the ductwork leakage testing procedure.

o ductwork shall be pressure tested for leakage

The Sub-contractor shall provide the necessary test equipment and skilled labour tocarry out the tests satisfactorily.

Tests shall be witnessed and certified by the Client or his representative. Prior towitness of final tests, the sub-contractor shall carry out preliminary tests to ensure

the test results are within specified limits.

All ductwork shall be tested for leakage without duct insulation or duct enclosure atthe joints.

Accuracy of the test apparatus shall be within:

(i) 5% of the indicated flow rate or 0.4 I/s, whichever is greater, and(ii) 5% of the indicated static pressure in duct under test.

The test apparatus shall have a calibration certificate, chart or graph dated not earlier

than one year before the test for which it is used.

Procedure

The section of ductwork to be tested for air leakage shall be sealed. Main ductsshall be provided with flanged joints to enable blanking plates to be fitted, while

small open ends may be sealed with polythene or inflatable bags, which shall be left

in position until final connections, are made.

The section of ductwork to be tested shall have an area large enough to enable the

test equipment to register a measurable leakage.

Complete Parts 1, 2 and 3 of the TEST SHEET, sample appended in Item 7.

Connect test apparatus to section of ductwork to be tested.

Adjust test apparatus until the static pressure differential is obtained.

The test pressure shall be 1.5 times the working pressure.

Check that the measured leakage is within the permitted rate.

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Maintain the test for fifteen (15) minutes and check that the leakage rate has notincreased.

Reduce pressure in ductwork to zero by switching off the fan, then immediately

reapply test pressure to establish that the air leakage rate is not greater than previous

reading.

Record details on Part 4 of the TEST SHEET.

Re-testing

The air leakage rate for any section of ductwork shall not be in excess of thepermitted rate for that section. If the first test produces leakage in excess of the

permitted maximum the section shall be resealed and re-tested until a leakage notgreater than the permitted maximum for that section is achieved.

Certified Tests

When satisfied with the results of the above preliminary tests the sub-contractor shallmake arrangement to carry out the final tests which shall be conducted in the

presence of the Client or his representative.

Test particulars shall be recorded in Part 4 of the TEST SHEET and signed by the

Client or his representative.

Duct Area EstimationThe surface area of the section of the ductwork under test shall be estimated. Details

of the estimation shall accompany the TEST SHEET in the following format:

Width and Depth Periphery Length Areaor Diameter

(Millimetres) (Millimetres) (Meters) (Square Meters)

LEAKAGE FACTOR TABLE.

The leakage factor is determined by the specified pressure classification and Test Static

Pressure. It is used to compute the maximum permitted leakage by multiplying it by theestimated duct area.

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STATIC MAX. LEAKAGE PER SQ.METER DUCT WORK IN L/SPRESS DIFF

(Pa)

LOW PR.CLASS

A

MED.CLASS PR.

B

HIGH PRESSURE

CLASS C CLASS D

100 0.54 0.18

200 0.84 0.28300 1.10 0.37

400 1.32 0.44

500 1.53 0.51

600 0.58 0.19

700 0.64 0.21800 0.69 0.23

900 0.75 0.251000 0.80 0.27

1100 0.29 0.10

1200 0.30 0.101300 0.32 0.11

1400 0.33 0.11

1500 0.35 0.121600 0.36 0.12

1700 0.38 0.13

1800 0.39 0.131900 0.40 0.14

2000 0.42 0.142100 0.14

2200 0.15

2300 0.15

2400 0.162500 0.16

Ductwork Leakage Test Sheet Ref. No: ......................

Project title: .....................................................

Building ref: .....................................................

Part 1 Specified

(i) Pressure Classification: .....................................................

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(ii) Test static pressure: .....................................................

Part 2 - Physical details

(i) Section of ductwork: .....................................................

(ii) Drawing ref: .....................................................

(iii) Leakage factor: .....................................................

(iv) Surface area of duct .

(v) max permitted leakage ...

Part 3 - Test equipment

(i) Manufacturer: .....................................................

(ii) Type of model: .....................................................

(iii) Range of flow at test static pressure ..

Part 4 - Test results

(i) Duct static pressure: .....................................................

(ii) Reading of flow measuring device: .....................................................

(iii) Interpreted air flow leakage rate: .....................................................

(iv) Duration of test (normally 15 min.): .....................................................

Conducted by.....................................................

Date of test .....................................................

Witnessed by .....................................................

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SECTION: 10

SERVICE AND MAINTENANCE SCHEUDLE

GENERAL

o The Scope of this section sets out the requirements for the supply of all materials,labour and all necessary accessories for the proper and efficient maintenance of theAir Conditioning Plant and Ancillary Equipment for this project.

o All works to be performed under this specification shall be in accordance withmanufacturers recommendations with the specification.

WORKMANSHIP AND MATERIALS

All works to be performed shall be carried out by workman skilled in the servicemaintenance and repair of Air Conditioning plant of all types and shall be executed

in accordance with the best Commercial practice.

All materials used in connection with the work shall be new and unused and

generally be original spares from the manufacturers.

SUPERVISION

o The repair and maintenance work shall be carried out under the supervision of aForeman in charge of the servicing. The foreman shall be thoroughly competent and

experienced in the supervising, maintenance and repair of Air Conditioning plant

and accessories of all types and be in. the direct employ of the Sub-Contractor and

acceptable to the Client/Owner.

o All workmen employed shall be skilled in the service, maintenance and repair of Air

Conditioning Plant and accessories of all types and be in the direct employ of theSub- Contractor.

SCOPE OF WORK

The Sub-Contractor shall inspect and service all Machinery and equipmentcomprising the complete Air Conditioning plant and accessories in accordance with

the Schedule listed below.

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The Sub-Contractor shall advise the Client/Owner of any defects in any part or partsof the complete Air Conditioning Plant and Accessories observed during the routine

inspection and servicing and shall repair such defects at the Client/Owners approval.

The Sub-Contractor shall also provide emergency repair service during normalworking hours and also outside normal working hours if required to do by the

Client/Owners.

SERVICING AND MAINTENANCE SCHEDULE

o The Sub-Contractor shall inspect and service all machinery and equipmentcomprising the Complete Air Conditioning Plant and accessories at least once amonth, except where otherwise directed by the Owners/Client.

o At each such monthly inspection and service of the complete Air Conditioning Plantand Accessories, the work detailed below shall be performed by the Sub-Contractor.

COMPRESSORS

Inspect all refrigerant compressors and refrigeration systems and check thefollowing:

a) Check all joints and pipe lines for leaks and rectify as necessary.

b) Check all refrigerant and oil levels, and charge refrigerant and oil into

refrigerant systems as necessary.

c) Check the operation of all refrigerant controls, and clean, adjusts and

lubricate as necessary.

d) Check the operation of all safety devices, and clean, adjusts and lubricate. as

necessary.

e) Check the suction and discharge pressures of all refrigerant compressors, andif abnormal trace the faults and rectify as necessary.

f) Check all bolts and nuts for tightness and tighten as necessary.

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ELECTRICAL MOTORS

Inspect all electric motors, and check the following:

i) Check all motor bearings and lubricate with grease as necessary.

ii) Check carbon brushes and slip rings of all motors, and clean as necessary.

Renew carbon brushes as necessary.

iii) Check safety devices fitted to all motors and clean, adjust and lubricate asnecessary.

ACCESSORIES

Inspect and check the routine operation of all electrical starters, electrical control

gears, and ancillary electrical apparatus and check the following:

i) Check, adjust and lubricate all bearings, pivots and other moving parts as

necessary

ii) Clean or renew electric contactors as necessary.

iii) Renew electric fuses as necessary.

Inspect and check the routine operation of all automatic temperature controls and relays, and

i) Clean adjust and lubricate all bearings, pivots and other moving parts as

necessary.

ii) Renew electric fuses as necessary.

Instruct the operators responsible for the operation of the plant and equipment on correctmethod of operating the plant and equipment, and on the maintenance points to be watched.

Report in writing to the Client/Owner any defect (s) observed in any part or parts of the

complete air conditioning plant and accessories. The report shall state the cause (s) of the

defect (s) observed and shall include an estimate of the cost of repairs required.

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CONSUMABLE MATERIALS

The Sub-Contractor shall supply the following consumable materials as and when required:

a) Lubrication oil required for lubrication of compressors, grease for fan

bearings, motor bearings, pivots and other moving parts.

b) All refrigerant required to replace refrigerant losses in the refrigerant system.

c) All consumable filter elements.

d) All carbon brushes required to replace worn bushes in electric motors.

e) All electric contact points required to replace worn electric contact points in

switch gears, motor starter gears, electric control gears and electric relays.

f) All cotton waste, soap detergent and other cleaning materials required forcleaning purposes.

The costs of these consumable materials shall not be charged for separately by the Sub-Contractor, but shall be included in the fixed monthly quoted by the Sub-Contractor for the

service and maintenance of the complete Air Conditioning Plant and Accessories.

All other non consumable materials shall be charged with prior approval from theClients.

REPAIRS

The Sub-Contractor shall repair defects in the ductable split units and Accessories on the

instructions of the Owner/Client.

The costs of such repairs shall not be included in the fixed monthly rate quoted by the Sub-Contractor for the service and maintenance of the completely Air Conditioning Plant and

Accessories but shall be charged for separately by the Sub-Contractor.

All repairs on the complete Air Conditioning Plant and accessories shall be guaranteed by

the Sub-Contractor against defects in workmanship and materials for a period of one year to

take effect from date of completion of the repairs. During the guarantee period, the Sub-Contractor shall rectify defects in repairs carried out by him with no additional charge to the

Client/Owner.

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SERVICE AND MAINTENANCE RECORDS

o The Sub-Contractor shall provide a service and maintenance record book for thecomplete Air Conditioning Plant and accessories being serviced and maintained, and

brief details of all service, maintenance and repairs carried out on shall be entered by

the Sub- Contractor into this book for checking purposes. The address and telephonenumber of the Sub-Contractor's service station shall also be entered into the record

book to facilitate emergency service calls.

o The Sub-Contractor shall also keep an accurate detailed record in duplicate of allservice, maintenance and repair work carried out by him on the complete Air

Conditioning Plant and accessories. This record shall be in the form of a

Maintenance/Repair sheet, and shall be countersigned by the Owner/Client each timethe Air Conditioning Plant and accessories is attended to the Sub-Contractor.

RATES FOR SERVICE AND MAINTENANCE

The rates for the service and maintenance of the complete Air Conditioning plant and

accessories shall be as shown in the Appendix to Form of Tender.

These rates shall be quoted for by the Sub-Contractor the time he submits his tender, and

shall hold good for the period of three years commencing from the end of the free

maintenance period. The Sub-Contractor may be required to enter into a Contract for theabove period with Client/Owner.

The contractor should indicate the response time in their offers for all breakdown calls

and service calls.

The contractor should provide list of skilled technician and experts in their offer.

Note: The contractor to provide complete details of warranty maintenance schedule

and annual maintenance schedule as recommended by the equipment manufacturer.

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SECTION: 11

TESTS

The following readings shall be taken (and results computed) during the performance tests

on the plant.

AIR DISTRIBUTION SYSTEM

a. Dry bulb and wet bulb

temperatures at supply air

grilles

Grille Dry Bulb Wet Bulb

No. Temperature Temperature

1

2

3

NOTE: 1 Supply air CFM reading shall be taken at supply air grilles/diffusers and cross

checked by additional measurements at any convenient points in the system like for

instance, return air opening for AHU intakes.

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SECTION: 12

COMMISSIONING REPORT

Date

Page

Project Name

System

DIRECT EXPANSION COOLING DATA

System

Location

Service

Manufacturer

Design Actual Design Actual Design Actual Design Actual

CFM

E.A.T.,DB F

E.A.T.,WB F

L.A.T.,DB F

L.A.T.,WB F

MBH

System

LocationService

Manufacturer

Design Actual Design Actual Design Actual Design Actual

CFM

E.A.T.,DB F

E.A.T.,WB F

L.A.T.,DB F

L.A.T.,WB F

MBH

Remarks

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SECTION: 13

APPROVED MAKE OF MATERIALS FOR AIR CONDITIONING EQUIPMENT

1. DX Ductable split units : LG / Bluestar / Voltas

2. Supply & Return

Diffusers : Ravi Star / Air Master / Air Guide/ System air

3. Filters : Aerosol / Erofil / John Fowler / EMW

4. Motors : ABB/ CG / Bharth Bijili

5. Galvanized Sheet Steel : SAIL / Jindal

6. PUF Insulation Foam : Lloyds/Salvicate

NOTE: Contractors intending to supply other makes of materials/equipment than those

listed above, shall indicate the makes in their offers. Also the contractors shall clearly

indicate in their tender the make of equipment considered by them in their offer.

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SECTION: 14

LIST OF DRAWINGS

Sl.No. TITLE DRAWING NO.

1. Ground Floor HVAC Ducting Layout DBRA-KEWHVAC GFDWG 0012. First Floor HVAC Ducting Layout DBRA-KEWHVAC FFDWG 002

3. Second Floor HVAC Ducting Layout DBRA-KEWHVAC FFDWG 003

NOTES ON DRAWINGS:

1. The drawings furnished to the tenderer shall be interpreted by the use of given routingand nomenclature only; they shall not be scaled under any circumstances. Drawings to

a large scale have precedence over those to a smaller scale. These drawings are generalin nature and cannot be regarded as working drawings.

2. Drawings have been prepared showing the areas to be air conditioned and the spaceallocated for plant room, equipment rooms, etc. The equipment offered shall beaccommodated within the space provided as far as possible. If nevertheless additional

space is required for the equipment offered the tenderer shall bring out this point clearly

in the tender itself. He shall note in this context that claims for additional space, ifmade at a later date will not be entertained.

3. Space allocated for major air conditioning equipment shall be taken into considerationbefore ordering the equipment and they shall fit into the space provided with required

clearance all round as per relevant I.S.S sand I.E Rules.

4. Layout of equipment, duct routings, etc., as shown on the drawings, represent a feasiblescheme. Apparatus may be re-arranged in the space allocated subject to the approval ofthe Consultants/Owner.

5. Detailed Working Drawings

6. Prior to the execution of the work, the contractor shall check all drawings,specifications and shall within fifteen days report any errors, discrepancies and or

omissions discovered therein to the Engineer-in-Charge and obtain appropriate orders

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on the same. Any adjustment made by the contractor without prior approval of theConsultants/Owner shall be at his own risk and cost.

7. The drawings attached to these specifications are general in nature and cannot beregarded as working drawings. The contractor shall prepare his own detailed working

drawings and get them approved by Consultants/Owner before execution. For any

further drawings or specification that may be required for the execution of the works or

otherwise under the contract, the contractor shall give adequate notice in writing to theConsultants.

8. Prior to submission for approval, the contractor shall be responsible for thoroughlychecking all drawings to ensure that they comply with the intent and the requirements

of the contract specifications and that they fit in with the overall building layout.

9. The contractor shall obtain the approval in writing of the Consultants/Owner for hisdetailed working drawings before proceeding with the work. For this purpose, he shall

submit 8 sets of drawings to the Consultants/Owner. Any alterations proposed by the

Consultants/Owner shall be incorporated in the drawings by the contractor and thecorrected drawings shall be submitted once again in 8 sets to the Owner.

10. The working drawings to be submitted by the contractor shall comprise shall aspects ofair distribution, refrigerant piping, foundations, equipment layouts, routing of ducts,

cables, etc.

11. After installation is completed, 8 sets of "As built drawings" shall be prepared in fulldetails and submitted to the Consultants/Owner within 3 weeks from the date of

completion of installation.

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Hvac Specifications

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