06051 MANOR 2 MVAC SPEC REV 01 14022007

8/17/2019 06051 MANOR 2 MVAC SPEC REV 01 14022007

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BPS ♦ 06051 ♦ Revision 01 12.02.2007

Technical Specification

MECHANICAL VENTILATION& AIR CONDITIONING SERVICES

Project

THE MANOR IN HCMC – PHASE 291 NGUYEN HUU CANH – BINH THANH – HCMC

Client

BITEXCOLAND

Consultants

PROJECT MANAGEMENT: COTEBA MANAGEMENT

QUANTITY SURVEYORS: LEVETT & BAILEY

PROJECT ARCHITECTS: HO THIEU TRI ARCHITECTS & ASSOCIATES

STRUCTURAL ENGINEERS: PIMENTEL & ASSOCIATES

FOUNDATION ENGINEERS: CTFE

MECHANICAL & ELECTRICAL ENGINEERS: BONWAY PROJECT SERVICES (BPS)


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THE MANOR IN HOCHIMINH CITY – PHASE 2

TECHNICAL SPECIFICATION – MVAC SERVICES

TABLE OF CONTENTS

Page No.

BPS♦

06051 Revision 01

1. SCOPE OF WORK..................................................................................................................... 1

1.1

PROJECT DESCRIPTION.............................................................................................. 1

1.2

SERVICES DESCRIPTION............................................................................................. 1

1.3 DEFINITION OF TERMS ................................................................................................ 1

1.4

EXTENT OF WORK........................................................................................................ 2

1.5 SCHEDULE OF DRAWINGS ..........................................................................................3

2. CO-ORDINATION AND WORK BY OTHER CONTRACTORS ................................................. 4

2.1 CO-ORDINATION ........................................................................................................... 4

2.2 WORK BY OTHER CONTRACTORS............................................................................. 4

3. SPECIFIC PROJECT REQUIREMENTS ................................................................................... 7

3.1 DESIGN REQUIREMENTS.............................................................................................7

4. GENERAL REQUIREMENTS....................................................................................................9

4.1 SITE INSPECTION ......................................................................................................... 9

4.2 AUTHORITY REQUIREMENTS AND STANDARDS ............ ............. .............. ............. .. 9

4.3

WARRANTIES ................................................................................................................9

4.4 SPECIFICATION AND DRAWINGS.............. ............ ............. ............ ............. ............ .... 9

4.5 DISCREPANCIES & OMISSIONS .................................................................................. 9

4.6 SETTING OUT OPENINGS AND MAKING GOOD............ ............. ............ .............. .... 10

4.7

POSITIONING OF OUTLETS AND EQUIPMENT ........................................................10

4.8 CO-ORDINATION OF INSTALLATION....... ............ .............. ............ ............. ............. .. 10

4.9

PERFORMANCE AND GUARANTEE........... ............ ............. ............. ............. ............. 10

4.10 SHOP DRAWINGS ....................................................................................................... 11

4.11 AS-INSTALLED OR AS-BUILT DRAWINGS............. ............. ............ ............. ............ .. 11

4.12 EQUIPMENT DEVIATIONS..........................................................................................11

4.13 PACKAGED EQUIPMENT............................................................................................ 12

4.14 SAMPLES AND PROTOTYPES ................................................................................... 12

4.15 RADIO INTERFERENCE..............................................................................................12

4.16

LABELLING................................................................................................................... 13

4.17 WORKMANSHIP AND MATERIALS............................................................................. 13

4.18 SETTING OUT.............................................................................................................. 14

4.19 PRECAUTIONS IN CARRYING OUT WORKS............... ............. ............. ............. ....... 14

4.20 SCAFFOLDING AND LIFTING EQUIPMENT............................................................... 14

4.21 SEALING OF PENETRATIONS.................................................................................... 14

4.22 FIXINGS AND PLUGS.................................................................................................. 15

4.23 STORAGE AND PROTECTION......... ........... .............. ............ ............. ............ ............. 15

4.24

SITE CLEANLINESS AND REMOVAL OF RUBBISH..... ............. ............ .............. ....... 16

4.25 NOISE AND VIBRATIONS............................................................................................16

4.26

PIPE SLEEVES............................................................................................................. 17

4.27 EXPANSION .................................................................................................................17

4.28 EXISTING SERVICES .................................................................................................. 17

5.

EQUIPMENT............................................................................................................................ 18

5.1 SCREW CHILLERS - AIR COOLED ............................................................................. 18

5.2 CENTRIFUGAL PUMPS............................................................................................... 24

5.3 VRV AND MULTI SPLIT AIR CONDITIONING SYSTEM ............................................. 25

5.4 FAN COIL UNITS..........................................................................................................27

5.5 AIR FILTERS ............ ............. ............ ............. ............ ............ ............. ............ ............. 29

5.6 AXIAL FLOW FANS ........... .............. ........... .............. ............ ............ ............. ............ ... 30

5.7 CENTRIFUGAL FANS .................................................................................................. 33

5.8 IN-LINE CENTRIFUGAL FANS..................................................................................... 33

5.9 PROPELLER FANS - WALL OR CEILING MOUNTED......... ............. .............. ............. 33

5.10 EXHAUST FANS - ROOF MOUNTED .......................................................................... 34


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TABLE OF CONTENTS

Page No.

BPS♦

06051 Revision 01

5.11 CLOSED TYPE EXPANSION VESSEL ........................................................................ 34

6.

DUCTWORK & FITTINGS ....................................................................................................... 35

6.1 GENERAL..................................................................................................................... 35

6.2 SHEET METAL DUCT MATERIALS.............................................................................36

6.3 FLEXIBLE DUCTS........................................................................................................ 36

6.4 FITTINGS...................................................................................................................... 37

6.5 DUCT SUPPORTS, HANGERS AND BRACING .......................................................... 40

6.6 AIR OUTLETS....... ............ ............. ............ ............. ............ ............. ............ ............. .... 41

6.7 THERMAL AND ACOUSTIC INSULATION......... ............ ............. ............ .............. ....... 44

6.8 SEALING AND FLASHING ...........................................................................................46

6.9 TEST POINTS............................................................................................................... 46

6.10 CLEANING AND PROTECTION DURING CONSTRUCTION........... ............ ............ ... 47

6.11 LEAK TESTING ............................................................................................................ 47

7. PIPEWORK AND FITTINGS.................................................................................................... 48

7.1

GENERAL..................................................................................................................... 48

7.2 OPERATING AND TEST PRESSURES ....................................................................... 49

7.3 PIPEWORK MATERIALS........... ............. ............ .............. ............ ............. ............ ....... 49

7.4 PIPE JOINTS, UNIONS AND FLANGES ...................................................................... 50

7.5 PIPE FITTINGS............................................................................................................. 51

7.6 WELDING OF FERROUS PIPEWORK...... ............. ............. ............ .............. ............. .. 52

7.7 WELD JOINTS ON UPVC PIPEWORK............. ............. ............ .............. ............ ......... 53

7.8 WELD JOINTS ON COPPER PIPEWORK ...................................................................53

7.9 PIPE SUPPORTS ......................................................................................................... 53

7.10 FLEXIBLE PIPE CONNECTIONS AND EXPANSION............. ............. .............. ........... 57

7.11 THRUST BLOCKS ........................................................................................................ 57

7.12 GUIDES ........................................................................................................................ 58

7.13 PIPELINE GRADIENTS ................................................................................................ 58

7.14

AIR VENTS ........... ............. ............ ............ ............. ............ ............. ............ ............. .... 59

7.15 DRAIN POINTS............................................................................................................. 59

7.16

VALVES ........................................................................................................................ 60

7.17 FLOW METERS AND GAUGES ................................................................................... 63

7.18

UNIVERSAL PRESSURE/TEMPERATURES TAPPING POINTS............. ............ ....... 64

7.19 PIPE SLEEVES............................................................................................................. 64

7.20 WATER STRAINER (PIPELINE).......... ............ ............. ............. ............ ............. .......... 65

7.21 WATER HAMMER ARRESTOR ................................................................................... 65

7.22 PIPE CLEANING........................................................................................................... 65

7.23 PIPEWORK INSULATION ............................................................................................65

7.24 AIR RELEASE AND VACUUM BREAK VALVES FOR WATER PIPELINES............. ... 67

8. CHILLED WATER TREATMENT............................................................................................. 69

8.1 GENERAL..................................................................................................................... 69

8.2

CHILLED WATER SYSTEM ......................................................................................... 70

9. ELECTRICAL........................................................................................................................... 72

9.1 GENERAL..................................................................................................................... 72

9.2 MECHANICAL SERVICES SWITCHBOARDS (MSSB)............ ............. ............ ........... 72

9.3 ELECTRICAL CONTROL PANEL COMPONENTS ...................................................... 74

9.4 ELECTRICAL INSTALLATION......... ............ ............. ............ ............. ............ ............. .. 76


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TABLE OF CONTENTS

Page No.

BPS♦

06051 Revision 01

10. PAINTING, LABELLING AND FINISHING ..............................................................................78

10.1

MATERIALS.................................................................................................................. 78

10.2

PLANT, MACHINERY & EQUIPMENT............ ............ ............. ............ .............. ........... 78

10.3 EXPOSED METALWORK.............................................................................................78

10.4

CONCEALED METALWORK........................................................................................ 78

10.5 PLASTERED FINISH INSULATION..... ............. ............ ............. ............ ............. .......... 78

10.6 PIPEWORK AND METAL SHEATHING............. ............. ............ ............. ............. ........ 79

10.7 PIPEWORK IDENTIFICATION ..................................................................................... 79

10.8 DUCTWORK IDENTIFICATION.................................................................................... 79

10.9 COLOUR SCHEMES .................................................................................................... 80

10.10 LABELLING................................................................................................................... 80

10.11 APPLICATION OF PAINTING........ ............. ............ ............. ............ ............ ............. .... 81

11. TESTING, BALANCING & COMMISSIONING........................................................................ 82

11.1 GENERAL..................................................................................................................... 82

11.2

SUPERVISION BY ENGINEER FROM THE MANUFACTURER................. ............. .... 82

11.3 ACCEPTANCE PROCEDURE............... ............ ............. ............. ............ ............. ........ 82

11.4 EQUIPMENT FOR TESTING AND COMMISSIONING ................................................ 83

11.5 TESTING DURING ERECTION.................................................................................... 84

11.6

PRELIMINARY COMMISSIONING AND PRETREATMENT ........................................ 85

11.7 FACTORY TESTS ........................................................................................................ 86

11.8

ON-SITE TESTING AND COMMISSIONING.... .............. ............ ............. .............. ....... 87

11.9 LOCAL AUTHORITIES’ TESTS & INSPECTIONS .......................................................97

11.10 TRAINING OF PLANT OPERATORS........................................................................... 97

12.

SERVICE AND MAINTENANCE.............................................................................................. 98

12.1 SCOPE.......................................................................................................................... 98

12.2 SERVICE ...................................................................................................................... 98

12.3 SERVICE REPORTS .................................................................................................... 98

13.

OPERATING AND MAINTENANCE MANUALS...................................................................... 99

13.1 GENERAL..................................................................................................................... 99

13.2 MANUAL CONTENTS................................................................................................... 99

13.3 AS INSTALLED DRAWINGS ........... ............. ............ ............. ............ ............. ............ 100

APPENDIX A – SCHEDULE OF TENDER DRAWINGS

APPENDIX B – SCHEDULE OF TECHNICAL DATA

APPENDIX C – VIETNAMESE TRANSLATION


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THE MANOR IN HOCHIMINH CITY – PHASE 2 Page 1


BPS ♦ 06051 Revision 01

1. SCOPE OF WORK

1.1 PROJECT DESCRIPTION

The Manor phase 2 project a new building and located at 91Nguyen Huu Canh Street,Binh Thanh District – Ho Chi Minh City.

The project will comprises 3 basements, 2 Podium floors and 2 Residential & OfficeTowers of 30 storey high and 16 storey high with constructional details as below:

Tower Level Usage GFA

A & B Basement 3,2 & 1 Car Parking & Technical Rooms 14,533 m2

A & B Ground & 1st floor Retails, Restaurant and Entertainment 6,278 m

2

A 2nd

~ 24th

floor 458 Offitel Type A, A1, B, C, D, E 21,757 m2

A 25

th

floor Outdoor Swimming Pools, Gym 436 m

2

A 26th

~ 29th

floors 21 Offitel Type N, O, P, Q, R 2,762 m2

B (gl 8~13) 2nd

~ 13th

floors 48 Offitel Type F 3,883 m2

B (gl

13~15) 2

nd ~ 16 floors

96 Offitel Type G, H, I, j, K, L, M, G1,

I1, K1, L1

7,505 m2

Total Construction Area: 57,154 m2

1.2 SERVICES DESCRIPTION

The services cover under this specification is for the supply, installation, testing &

commissioning and maintenance during defect liability period of MechanicalVentilation and Air Conditioning Systems.

The Mechanical Ventilation shall be installed at all Plant rooms and the Toilets.

The Air Conditioning Systems shall be installed at all designed areas.

1.3 DEFINITION OF TERMS

The following definitions apply to the terminology used in this specification andassociated drawings.

Owner/Principal: BITEXCOLAND

Project Management: COTEBA MANAGEMENT

Quantity Surveyor: LEVETT & BAILEY

Architect Consultant : HO THIEU TRI ARCHITECTS & ASSOCIATES

Civil / Structural Consultant: CTFE / PIMENTEL & ASSOCIATES

M&E Consultant: BONWAY PROJECT SERVICES (BPS)

The Contractor: The M&E Trade Contractor appointed to carry out thework covered in the services specifications anddrawings.

Approval/Approved: Subject to the approval of the Owner/Principal orPM/Consultants.

.


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1.4 EXTENT OF WORK

This specification, unless specifically stated otherwise, calls for the provision of

systems complete in every respect, fit and ready for continuous, safe, efficientoperation. The Contractor shall therefore supply, deliver, install, test, commission andset to work the systems and they shall be complete with all necessary ancillary andminor items, whether expressly indicated on the drawings or specification or not.

It shall be this Contractor’s responsibility to calculate the resistance head for all fansand pumps and by this calculation guarantee the delivery of the specified conditionedair and water quantities at the locations shown on the drawings and specified herein.

The works by this Contract shall comprise the following:

(a) A central cooling plant comprising air- cooled screw chillers located on the rooffloor, chilled water centrifugal pumps, insulated pipework, valves and fitting, feedand expansion tank and the like

(b) Multi-Split Air Conditioning System to Each Offitel Unit and VRV Air ConditioningSystem to Caféteria and shall be completed with insulated pipe work, wall/floormounted evaporators and associated controls, electrical works

(c) A condensate drain pipe system with fittings

(d) Complete air distribution/ventilation systems consisting fan coil units (FCU), thecontroller and thermostats, ventilation fans, filters, ducting and the like

(e) All air registers/diffusers and air distribution system accessories including manualvolume control dampers, splitter damper, air outlets, access panels, etc.associated with the MVAC systems

(f) Complete mechanical ventilation system for basement carparking, toilets, allplant rooms as shown on the drawings

(g) All thermal insulation associated with the MVAC installation

(h) All noise and vibration control works associated with the MVAC installation

The Contractor shall include for all noise and vibration measures and acoustictreatment specified elsewhere in this specification to achieve the noise levels asspecified. Detail calculation and shop drawings shall be submitted for approval.The acoustic treatment which has been specified herein is the minimumrequirements and shall be provided in all cases

(i) All electrical works associated with the MVAC installation (including MSSB,submain from MSB to MSSB will be provided by Electrical Contractor).

(j) Control valves, chilled water flow meter, pressure/temperature/flow sensors andautomatic temperature controls such as DDC in associated with the MVACinstallation

(k) Water treatment system for chilled water circuits(l) Provision of manual override switch at Fire Services control room to switch off all

fans of the MVAC system serving the building in the event of a fire alarm

(m) All painting of ductwork, pipework and equipment and the like

(n) Interface work with Main Contractor/Other Contractors as detailed in the followingclause for ‘Interface Work’

(o) Liaison with, and submission to, all Local Authorities to obtain all necessarycertificates and approvals including the completion of all forms, preparation of allshop drawings and other document for necessary submission purpose and thepayment of any fees


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The submission shall include but not be limited to the following:

(i) Local Police Fire Services Department (FSD) for Stair Pressurisation Fansand Ventilation / Air-Conditioning Control System

(ii) Work Completion certificate in accordance with the Local Power Companyfor Electrical installation associated with MVAC Installation if required

(iii) Provision of spare parts as scheduled

(p) Training of Owner/Principal’s staff for proper operation of the entire installedsystem

(q) Liaise, assist, co-ordinate and provide technical supports/supervision to theChiller Specialist for the testing and commissioning of the Chiller Plant.

(r) Selection, installation and commissioning of plant and equipment, includingappropriate isolation and acoustic treatment, to achieve the design noise levelsspecified elsewhere in this specification.

(s) All associated building work unless specifically nominated elsewhere in this

specification. The work shall include the following:(i) Making good, Painting

(ii) Fire stopping

(t) Testing, commissioning, maintenance and defects liability for the MVAC workThis shall include:

(i) Defects liability for 52 weeks from date of Practical Completion

(ii) Provision of Operational Maintenance and Breakdown Services includingall labour, tools, materials, spare parts and consumerables during thedefects liability period

(u) Provision of four (04) sets of Operating and Maintenance Manuals, including ‘as-installed’ or ‘as-built’ drawings and all testing and commissioning data

1.5 SCHEDULE OF DRAWINGS

Refer to Appendix A for the tender drawings which shall be read in conjunction withthis specification.


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2. CO-ORDINATION AND WORK BY OTHER CONTRACTORS

2.1 CO-ORDINATION

The Contractor shall co-ordinate and furnishes all necessary information as requiredto the Main Contractor and his nominated Contractors/Sub-Contractors so that workscan be carried out without undue delay to the construction programme.

Any additional work occasioned by lack of co-operation between the Contractor andthe Main Contractor or any other Contractors will not be considered as a variation tothe Contract or as grounds for extension of time.

The Main Contractor will be responsible for checking all penetration drawings and fornegotiating with the various Contractors for amendment of penetration requirementsas necessary.

2.2 WORK BY OTHER CONTRACTORS

(a) Building Works by Main Contractor

The following building works shall be provided by the Main Contractor:

(i) All concrete equipment plinths and concrete piers in plant rooms keyed tothe floor slab and graded where required. Plinths and concrete supportsshall have shapes and dimensions and contain the information foroperating weight and the load distribution for various pieces of equipmentas indicated on detailed shop drawings to be provided by the Contractor

(ii) All concrete inertia bases including steel frameworks and reinforcementsfor all the pumps as indicated on detailed shop drawings to be provided bythe Contractor

(iii) All architectural louvres mounted on external structural walls, ground floorand above (sizes and location shall be provided by Contractor who shall

also check and confirm whether louvres shown on Architectural drawingsare suitable or not)

(iv) All building penetrations through slab, beams and structural walls and thebuilding in of all pipe sleeves, puddle flanges and equipment holding downbolts, where required to be built in during construction. The Contractorshall supply all bolts, sleeves, and puddle flanges and detailed drawingsaccurately positioning such items

(v) The Contractor shall seal up the annular space between sleeves andpipes/ducts with approved materials to achieve fire resistant, waterproof, airtight and/or acoustic barrier as appropriate. The Main Contractor shall sealup openings between sleeves and structure or building elements

(vi) All access hatches, doors and panels as nominated by the Contractor and

in accordance with his details as required in false ceilings, masonry risers,plant rooms and at other places as required to allow access for adjustment,maintenance and cleaning

(vii) All cutting, patching, framing up, furring in, chasing and making goodassociated with the building construction for the passage of ductwork,pipes, conduits and grilles, and the like. Detailed shop drawings shall beprovided by the Contractor

(viii) All under-flashing of all roof penetrations for cables, pipes and ductwork(over-flashing shall be by the Contractor)


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(ix) Site facilities including temporary water and Lighting supply for lighting,operation of power tools and testing, commissioning and maintenance upto and including final acceptance of the MVAC Installation by thePrincipal/Consultants. The Contractor shall be deemed to have noted

these provisions and to have made due allowance for any additionalrequirements not described therein

(x) Floor drains and/or drain connections in plant rooms, manholes andequipment areas as shown on the detailed shop drawings

(xi) The Contractor shall supply and install condensate water pipes connectionsfrom MVAC equipment, overflow, and equipment drain to these drainconnection points even where details are not shown on tender drawings

(xii) The Contractor shall submit to the Main Contractor all necessaryinformation, schedules and fully dimensioned shop drawings showingdetails of building work required in connection with the Sub-contract work.Such submissions shall be made in sufficient time for the Main Contractorto obtain the Consultant’s approval and to enable the Main Contractor toincorporate all holes, chases and the like to be left in the structural building

work as it proceeds so as not to be cut out subsequently

(xiii) The Contractor shall provide all structurally embedded materials such aspipe sleeves, anchor bolts and the like to the Main Contractor sufficientlywell in advance of the progress of the works to enable such items to becast-in by the Main Contractor

(xiv) The Contractor shall provide adequate supervision and setting out on Siteto ensure that all the builder’s work is carried out in accordance with hisrequirements and as approved by the Architect. Any matters not inaccordance with his requirements shall be drawn to the attention of theMain Contractor who will amend/ alter as necessary


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(b) Electrical Works by Electrical Contractor

The following provisions shall be provided by Electrical Contractor to incorporatethe MVAC installation:

(i) Provision of power supply cables from MSB to MSSB. The ElectricalContractor shall terminate the power supply cables onto the MSSB. (TheMSSB and outgoing cables shall be done by the Contractor)

(ii) Provision of power supply to the small ventilation fans in the form ofswitched fused connection units

(iii) Provision of power supply to FCU in the form of switched fused connectionunits

(iv) Provision of a 30A 1∅ isolating switch (essential power supply) in theMSSB room for Chiller oil heater

(v) Provision of a 13A fused spur unit (essential power supply) in PAU for DDCoutstation

(vi) Provision of power supply to chemical dosing for chilled water pumps

(vii) General Power Outlets for all DDC

(viii) Plant room lighting and general power outlets

The Contractor shall supply and install power and control wirings from theswitches to all starter panels and motors of the MVAC equipment

Connection of wirings from dry contacts for remote indication of MVACequipment shall be provided by the Contractor

(c) Plumbing Works by Plumbing Contractor

(i) Floor waste or tundish to cooling coils, pumps, roof openings and at lowestpoint in the plant room

(ii) Cold water supply terminating in an isolation valve adjacent to feed andexpansion tanks

(iii) Acoustic treated drains from plant room down into occupied areas.

(d) Fire Protection Works by Fire Services Contractor

(i) Provision of fire rated addressable loop

(ii) Provision of addressable interface modules adjacent to MSSB andconnected to the addressable loop. Modules to incorporate input andoutput no volt relay contacts for control and monitoring of mechanical plantduring fire mode. Supply and installation of fire signal cabling from theMSSB to the interface module shall be by the Contractor. Final terminationto the interface module shall be by the Fire Services Contractor

(iii) Provision of manual control switches and status indication on the FireControl Panel for all mechanical plant required to operate in fire mode.

(iv) Fire Services Contractor and Contractor shall co-ordinate all interfacerequirements.


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3. SPECIFIC PROJECT REQUIREMENTS

3.1 DESIGN REQUIREMENTS

The MVAC services have been designed to the following criteria:

(a) Air-conditioning:

(i) Location

● Location: Ho Chi Minh City

● Latitude: 10.8oN

● Longitude: 106.6oE

● Elevation: 18.9 m

(ii) Ambient Air Temperatures

● Summer Dry Bulb: 37.0oC

● Summer Wet Bulb: 29.0oC

● Summer Daily Range: 11.0oC

● Designed Month: April or May

(iii) Air Conditioned Space Temperatures & Humidity

● Offices / Offitel Unit: 24oC ± 2oC & 55%RH ± 5%RH

● Retails & Circulations: 25oC ± 2oC & 60%RH ± 5%RH

(iv) Fresh Air Intake

● Offices: 10.0 L/s per person

● Retails: 10.0 L/s per person

(v) Population Density

● Offices: 10.0 m2 per person

● Retails: 3.5 m2 per person

(vi) Lighting & Electric Appliances

● Offices: Lighting: 20 W/m2, Power: 35 W/m2

● Retails: Lighting: 20 W/m2, Power: 28 W/m2

● Public Circulations: Lighting: 10 W/m2, Power: 10 W/m2

(vii) Building Parameters

● Double Brick External Walls: U = 1.931 W/oC.m2

● Single Brick External Walls: U = 3.584 W/oC.m2

● 6mm Glazing: U = 5.952 W/oC.m2

● Concrete Roof: U = 1.644 W/o

C.m2

● Terracotta Roof: U = 1.899 W/oC.m2

● Concrete Floor: U = 3.061 W/oC.m2

● Partition: U = 2.817 W/oC.m2


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(b) Ventilation

● Toilet Exhaust Air: The greater of 6AC/H or 25L/s/fixture or10L/s/m2 of Toilet Floor Area

● Car Parking Ventilation: AS 1668-Part 2

● Plant room Ventilation: AS 1668-Part 2

(c) Noise Levels

Noise from MVAC services equipment should be free of tonal and spectralcontent and should not exceed the following level when measured at a distanceof 1.2m above floor level, and 1.5m from any duct, cupboard or plantroom wall.Continuous noise level criteria are expressed in terms of Noise Criteria (NC) andshould be measured in the octave bands 63Hz to 8KHz.

● Offices: NC 30 – 40

● Retails, Public Circulations NC 35 – 40

Where a range is given, the lower level be used as a design goal. The upperlevel indicates the maximum permissible level on site.


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4. GENERAL REQUIREMENTS

4.1 SITE INSPECTION

Tenderers must inspect the site to familiarise themselves with the conditionsthereupon prior to submission of tender. Confirmation of site inspection shall besubmitted with tender.

4.2 AUTHORITY REQUIREMENTS AND STANDARDS

Australian Standards and Codes current at the date of tendering and also referenceCodes and Standards listed in the prefaces to those Standards and Codes areapplicable in respect of all materials and workmanship except where in conflict withthe provisions of these specifications.

Where Australian Standards and Codes does not exist, the appropriate BritishStandard or Code shall apply. Where this specification expressly requires standardshigher than or different from those applicable under the relevant Standard or Code

documents, this Specification shall be followed.

Advise all subsequent amendments to applicable codes as they come into forceduring the work and seek a direction regarding compliance for this project.

All work shall comply with the:

● Local Building Regulations

● Local Power Supply Authority Regulations

● Local Environmental Protection Department Requirements

● Local Police Fire Services Department Requirements

● All relevant Australian/British Standards and Codes

4.3 WARRANTIES

Warranties specified in this specification are additional to any warranties required bycurrent Industry Codes of Practice and relevant regulations

4.4 SPECIFICATION AND DRAWINGS

The drawings provided with this Specification as listed in Appendix A shall be read inconjunction with this Specification.

The Specification and drawings are mutually explanatory, and all work called for byone, even if not by the other, shall be fully executed and completed.

The drawings shall be considered approximate and diagrammatic only. Actualdimensions shall be obtained by the Contractor.

It is the responsibility of the Contractor to ascertain that all particular equipmentoffered fits into the provided spaces taking into consideration the requirements formaintenance and other factors affecting the installation.

4.5 DISCREPANCIES & OMISSIONS

If any discrepancy, contradiction or omission appears in the specification or drawings,the Tenderer shall refer same to the Owner/Project Manager and Consultant forresolution before submitting a Tender. The Consultant will issue directives on suchmatters in writing. Oral amendments to the specification shall not be recognised bythe Tenderer.


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4.6 SETTING OUT OPENINGS AND MAKING GOOD

The precise location of all openings, fixings and similar items of work required forthese works to be provided by the Main Contractor shall be determined at such times

as not to cause delay to the work. All items shall be checked to ensure correctpositioning. If openings, fixings and similar items of work are wrongly located or areomitted due to incorrect or lack of information, the cost of any remedial works shall bepaid for by the Contractor.

The specification and drawings are diagrammatic only and unless otherwise statedshall not be used for determining the precise positions of equipment outlets and likefeatures. The exact location of these shall be determined on site or from shopdrawings.

All chases, ducts, recesses and penetrations in structural elements not shown on thebuilding and structural drawings shall be subject to approval.

4.7 POSITIONING OF OUTLETS AND EQUIPMENT

The layout of equipment shown on the drawings is diagrammatic only, and exactpositions shall be determined on site. Final position shall be to the approval of theConsultant. Ensure that all plant offered is suitable for installation in the location andspaces shown on the drawings and will be accessible for maintenance in accordancewith the manufacturer’s recommendations when installed.

Positions of all general power outlets (GPO), wall switches and wall fittings shall bechalked up in areas where the outlets are adjacent to tiles or other architecturaldados. Approval of the Consultant shall be obtained before placing any final conduitsor wiring for these outlets.

Where outlets are in close proximity they shall be aligned horizontally and/or verticallyas the case may be.

Equipment shall be symmetrically located in relation to other equipment and devices,the building module and general aesthetic treatment.

4.8 CO-ORDINATION OF INSTALLATION

Co-ordination shall be carried out to ensure that all items for installation in falseceilings are provided in sufficient time to comply with the Main Contractor’s program. All other services within false ceilings shall be completely installed so that it will not benecessary to remove any ceiling tiles to finish other work, apart from commissioning.

Responsibility and provision shall be allowed for any cost where due to delays ordeficiencies attributable to this Contract, ceiling tiles must be removed and replaced,or additional penetrations provided in the ceiling.

4.9 PERFORMANCE AND GUARANTEE

The Tenderer will, by the fact of his tendering, be regarded as guaranteeing that:● The equipment offered by him is of the most modern and correct design and

construction and of the necessary capacity to efficiently perform the workspecified.

● The equipment offered is capable of being installed in the plant space shownon the exhibited drawing with adequate clearance for its proper operation andmaintenance.

● Noise levels due to plant installed under this Contract shall be not more thanas specified elsewhere in this specification.

● The equipment offered will provide the minimum capacities as scheduledelsewhere in this Specification or on the drawings.


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● The air distribution system shall be balanced to within ± 5% of the specifiedquantities.

● All the settings and limits of all control instruments and equipment shall be theresponsibility of the Contractor and he shall ensure that the specified

requirements and conditions are met.● The equipment installed by the Contractor shall maintain the air temperature

within the limits specified as inside design conditions at all times when theoutside air temperature is at or within the outside design conditions.

4.10 SHOP DRAWINGS

The Contractor shall prepare shop drawings (working drawings) of the proposedinstallation. All shop drawings shall be submitted to the Consultant for approvalbefore commencing any work. All checking and approval of such drawings by theConsultant shall be construed as gratuitously assisting the Contractor and does notrelieve the Contractor from responsibility for errors or omissions.

Where such errors or omissions are discovered later they shall be corrected by the

Contractor irrespective of any approval given by the Consultant. Approval of drawingsshall not be construed as authorising additional work or increased cost to theOwner/Principal In the event that the drawings indicate additional work involvingincreased cost, the Contractor shall notify the Principal/Consultant at the time ofsubmission of the drawings.

4.11 AS-INSTALLED OR AS-BUILT DRAWINGS

As from the commencement of work the Contractor shall employ a competentdraughtsman to keep a record of all deviations and changes from the contract andshop drawings and shall mark on a set of prints an accurate record of all work asactually installed.

Refer also to section 13 of this specification for more details.

4.12 EQUIPMENT DEVIATIONS

The dimensions and ratings of equipment specified herein or indicated on thedrawings are intended to establish the outlines and characteristics of equipmentfurnished by the particular manufacturers specified. Where the Contractor intends touse an item of equipment other than that specified or shown on the drawings he mustapply in writing to the Principal/Consultant and await written approval beforeproceeding.

Where such approved deviation requires a different quantity and arrangement ofarchitectural or structural materials, or a different quantity and arrangement of wiring,conduit and equipment from that specified or shown on the drawings, the Contractorshall furnish and install any such additional structural supports, insulation, controllers,motors, starters, electrical wiring and conduit, and any other additional materials and

equipment necessitated by the deviation. Alternative equipment and materials shall comply with maximum sound power levels,minimum insertion loss and absorption at the stated flow/static pressure etc. Wheresound power levels are exceeded, additional acoustic treatment shall be provided tocomply with the noise and vibration criterion at no additional cost to the contract.


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4.13 PACKAGED EQUIPMENT

Where packaged or unitary equipment is specified or offered against thisSpecification, such equipment shall be modified to conform to the requirements of this

Specification, whether or not this requires modification of the Manufacturer’s standardconstruction. Any modification shall be to the approval of the manufacturer and themodified equipment shall carry the manufacturer’s full warranty.

The fact that the Tenderer may have offered a particular packaged item by name shallnot absolve him from modifying it to meet the Specification.

4.14 SAMPLES AND PROTOTYPES

Samples of materials and items described as “to be approved” shall be delivered tosite at least 15 days before approval is required. Two samples shall be supplied ofeach item required, each one to be properly identified and marked with the suppliersname and model number. One of the samples shall be held on site, the second shallbe returned to the manufacturer once it has been viewed and comments have beenreceived from the Consultant. On acceptance the samples will be marked with:

● Date approved

● By whom

Submit the following sample fittings and accessories to obtain approval of theConsultant before installation:

● Registers, Diffusers and Grilles

● Temperature sensors

● Dampers

● Insulation Materials

● Piping Materials and Pipe Fittings

● Conduit and Cables

It shall be the responsibility of the Contractor to arrange for the Consultant to inspectthe samples to obtain approval and acceptance in writing of the offered samples.

The approved samples shall be retained on site for reference purposes untilcompletion of the work. All such materials used in the work covered by thisspecification shall conform to the approved samples.

The Consultant will be at liberty at any time to test or analyse samples of anymaterials brought onto the site and intended for these Works.

In addition to the above requirements for the production, submission and approval ofsamples and prototypes, the Main Contractor may prepare an area in advance of thegeneral construction cycle. The purpose of this area shall be to ensure co-ordinationof all services and finishes and as a display area. Provide and install all samples andprototypes required for such an area as directed by the Main Contractor.

4.15 RADIO INTERFERENCE

All equipment and/or appliances provided under this specification shall be designedso that no interference will be caused with any radio or other electronic transmitting orreceiving equipment in the same locality. In the event of the inherent characteristicsof the electrical installation being such that interference is possible, efficient devices orscreening techniques capable of eliminating such interference shall be provided at theContractor’s expense.

Define the areas susceptible to interference prior to the purchase of equipment andappliances and advise the Consultant of the methods to be adopted to reduce theinterference.


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4.16 LABELLING

All PAU, FCU, pumps, fans, control valves, chilled water pipes, condensate waterpipes, switches, fuses, relays, terminal strips, circuit breakers and compartments shall

be comprehensively labelled to clearly indicate their function.Labels shall be of Sandwich Ivorine or Traffolyte material, white with black lettering fornormal power and white with red lettering for standby power.

Labels shall be permanently attached to a fixed element by fastener or adhesive. Selfstick or adhesive tapes shall not be used.

Submit all label schedules for approval prior to manufacture.

4.17 WORKMANSHIP AND MATERIALS

The Contractor shall provide skilled and expert labour as necessary to carry out thework in the best possible manner. The quality of workmanship shall be of first gradeand in accordance with the highest standards of the respective trades. Workmanshipof poor quality or of an unacceptable standard will be rejected by the Consultant and

must be replaced by the Contractor at no extra cost to the Owner with workmanship ofthe required standard.

All materials, fittings, accessories and apparatus are to be of first grade design andmanufacture and are to comply with the relevant Australian/British standardspecification. All materials, fittings, accessories and apparatus shall be new and shallbe of current model and design unless specified otherwise. The Contractor mustsubmit for the approval of the Consultant prior to commencing installation, a list of allaccessories, fittings and apparatus which it is proposed to employ in the work, andonly such items as have been approved may be installed. Failure to comply with thisprovision will result in the unconditional rejection of such items when inspected onsite.

Where directed by the Consultants ‘approved’ samples shall be kept on site. Eachitem of equipment shall be a standard catalogue product of an established, reputable,

approved manufacturer. All similar equipment shall be of the same manufacture,type, class and finish, unless otherwise specified.

Where manufacturer’s catalogue numbers or types are specified or shown on thedrawings, they are generally intended to be used as a guide, and are not intended totake precedence over the basic duty and performance specified or shown. In allcases, verify the duty with the particular characteristics of the equipment offered forapproval.

Where no alternative materials are noted in the specification or on the drawings andwhere the words ‘equal’, approved equal’, ‘as approved’ etc do not appear, the exactmake specified must be furnished and installed. No alterations will be permitted in thelists of manufacturers and suppliers submitted by the Contractor with his Tender orsubsequently without the written approval of the Consultant.

Should the Contractor install materials and/or equipment other than by the approvedmanufacturer or supplier, such items may be rejected on site. All such rejected itemsshall be removed from the site as soon as possible and be replaced by approveditems at no cost to the Owner/Principal.

The replacement of any such items shall not constitute grounds for any variation orany extension of time.

The Contractor shall take every care to avoid damage to fittings, surfaces andequipment in the premises and any damage caused by his staff and/or the works ofhis Contract shall be his responsibility and shall be made good at his expense.


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4.18 SETTING OUT

The Contractor shall set out all lines and levels for the works and shall refer the sameto the Main Contractor for his approval and shall follow all directions of the Main

Contractor for modifications of same made necessary for the co-ordination of theworks.

The positioning of equipment as shown on the tender drawings shall be considered asapproximate and diagrammatic only and these drawings shall not be used for finalsetting out.

The Contractor shall thoroughly examine the Specification and tender drawings, checkall figured dimensions immediately after the sub-contract is awarded, and obtain suchmeasurements and information as may be required to carry out the work.

4.19 PRECAUTIONS IN CARRYING OUT WORKS

Where any current Australian/British Standards is appropriate to storage, transportand use of materials, plant, equipment, to work processes or to safety precautions the

provision of such Standard shall be observed except if they conflict with any regulationor special requirements of proper local authority in which case the latter shall apply.

In the absence of any such statutory or special requirements or relevant Standards,the Contractor shall ensure that suitable procedures are observed and all proper careis taken.

During the construction, leave all unfinished work in a safe condition and protect theworks against damage or loss through any cause whatever.

4.20 SCAFFOLDING AND LIFTING EQUIPMENT

Unless specifically instructed otherwise, provide all necessary temporary liftingequipment, scaffolding, framing or other supports to enable installation and access tothe work.

4.21 SEALING OF PENETRATIONS

(a) Airtight Seals

All penetrations of trays and/or ducts through the building fabric of chamberssubject to suction or pressurisation shall be sealed.

(b) Waterproofing of Penetrations

Floor penetrations for duct, pipe and cable risers shall be made weatherproofprogressively during the construction of the works to minimise weather damageor effects of internal flooding within the building.

(c) Holes in Roof

Continuous welded weather collars for over-flashing shall be supplied andinstalled for all external ducts and pipes forming part of the work and sealed withan approved sealant.

(d) Acoustic Sealing

Wherever services penetrate walls, floors or ceilings, acoustic sealant shall besupplied and installed to maintain a degree of acoustic separation at least equalto the materials penetrated.


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(e) Fire Barrier Penetrations

Where services penetrate fire walls, ceilings, floors or other fire rated barrier,sealant for those penetrations shall be sealed to the approval of the Authorities.The Authorities shall include:

● Local Building Authority

● Local Police Fire Services Department

● Local Power Supply Authority

The preferred method of sealing penetrations around ducts, pipes, cables andcable trays shall be by the use of fire retardant pillows packed tightly both sidesof the penetrations. Internal fire barriers using intumescent fire retardantmaterials shall be used within all ductwork passing through the fire rated walls orfloors.

4.22 FIXINGS AND PLUGS

Holes shall be drilled by electric or compressed air drill wherever possible. Explosive

charge fixing devices shall not be used.Where devices are required for attaching materials or equipment to the building,approved metal expansion devices shall be used when and where approved by theConsultant. Wooden plugs will not be permitted. Approval of the Consultant shallalso be obtained prior to drilling to ensure that any post tensioning cables in the slabare not damaged. The Main Contractor will mark the location of all such cables.

Cadmium plated expanding metallic type masonry anchors shall be used for fixings inconcrete, clay or concrete brickwork.

Bolts or machine screws with nuts, washers and anti-vibration devices shall be usedwhere necessary for fixings into metal.

Plugs may be used for screw fixing to masonry construction including plasteredexpanded metal. Such plugs shall be used only for minor shear loadings. Holes and

inserts and PVC screw anchor plugs shall be correctly sized.Cadmium plated bolts, screws and washers shall be used in all instances.

4.23 STORAGE AND PROTECTION

The Contractor shall be responsible for proper storage and protection of apparatus,materials and equipment on any site adjacent to, associated with or the subject of theworks.

Upon delivery to site all materials and equipment shall immediately be securedproperly stacked and protected from the weather dampness and dust with particularattention to preventing ingress to working parts and pipes. The Contractor shall beresponsible for storing all equipment which cannot be accommodated on site.


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The Contractor shall confer with the Main Contractor and accept his instructions withregard to storage of materials, particularly heavy loads. All equipment and materialsshall be stored clear of floor slabs on timber packers.

Special care shall be exercised to prevent the ingress of dirt, moisture and foreignsubstances into conduit pipes, duct and equipment. Should such ingress occurcarefully remove the offending matter and thoroughly clean the conduit pipes, ductsand equipment to approval

When any room in the building is used as a shop or storeroom in connection withthese works all resulting making good and repairs, patching or cleaning of the roomarising from such use shall be carried out prior to completion of the works.

Mixing of any materials on the floors other than where such material is finally to belocated shall not be permitted.

Fittings or other equipment shall not be used as a place for depositing tools andmaterials, as a means of supporting scaffolding or for use as a work bench.

4.24 SITE CLEANLINESS AND REMOVAL OF RUBBISH

The Contractor shall remove from site all rubbish, debris, material cuttings and otherredundant materials which result from the works of this Sub-contract, progressivelyand whenever directed by the Main Contractor

On completion of the work, promptly remove all materials and equipment from site,except such materials and equipment which the Owner has agreed to store for useduring the Maintenance Period or as are required for testing

4.25 NOISE AND VIBRATIONS

Attention shall be paid to the prevention of noise and vibration in all equipment andthe Contractor shall be responsible for the correction of such objectionable noise andvibration as may occur to the satisfaction of the Consultant.

Maximum noise levels in air-conditioned spaces shall not exceed the levels specifiedin AS2107, CIBSE and/or elsewhere in this specification.

The Contractor shall arrange for noise level testing at his cost where directed by theConsultant to prove that required levels have been achieved.

Plant sound power levels, duct absorption coefficients, attenuator and flexible ductinsertion loss and other plant or materials acoustic performance where specified shallbe submitted for approval by the Consultant prior to ordering. Samples may berequired.

The main precautions to be taken to prevent generation and transmission of unduenoise and vibration are as follows:

● All rotating machinery shall be properly balanced and shall be designed withclearances and mechanisms suitable for the noise level requirements, for the

particular item of plant or equipment, specified elsewhere in this specification.● Rotating machinery, unless otherwise specified, shall be mounted on springs,

rubber in shear or other approved vibration isolating mountings or shall beresilient bearings. The mountings shall be protected from drips and damage.Where necessary, additional mass shall be fixed to the machinery. Theloading of the mounting shall be adequate to ensure correct operation.Materials used to seal the spaces containing the isolating materials shall beflexible so that vibration is not transmitted and so that the seal is not damaged.

● Fan tip speeds and velocities and motor and compressor speeds shall be keptwithin the limits specified elsewhere in this specification.


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● All connections to rotating machinery shall be flexible.

● Duct connections shall be isolated by flexible connections.

● Pipe connections shall be suitably flexible for the duty involved. Approvedflexible connections shall be provided where insufficient flexibility can beobtained in the piping itself or when vibration could be transmitted to thebuilding structure. Flexible connectors shall be so positioned that no stressescan be put on the pipes due to end-reaction. Flexible connections inrefrigerant lines will only be permitted when the pipework cannot be arrangedto provide adequate flexibility.

● Electric motors shall be super silent types where noise from them could disturboccupied areas or raise the noise levels above those specified. Contactorsshall be free of undue hum and vibration.

● Internally insulated ducts shall be provided where and as specified. Ductinteriors shall be as smooth streamlined as possible - screw ends, raw edgesof metal, drumming panels, will not be permitted in the air stream.

● Air outlets and inlets shall be selected to permit the noise levels specified to beachieved.

4.26 PIPE SLEEVES

Provide pipe sleeves where necessary for installation of pipes through the buildingstructures.

4.27 EXPANSION

Provision shall be made throughout for expansion and contraction wherevernecessary to ensure stress due to expansion is relieved and is not transmitted tofixing devices or building structure. This shall include the supply and installation of allnecessary approved expansion devices.

4.28 EXISTING SERVICES

The Contractor shall contact all local authorities prior to commencing work, toascertain the precise location of all services in the vicinity of the proposed works andprotect the existing services as necessary during the progress of the work.

Any damage to existing services caused by the Contractor shall be made good at hisown expense. Where services conflict with the proposed design, the Contractor shalladvise the Consultant and shall allow in the contract sum for completing anyadditional works which may be required.

If any existing services are found to be damaged or require repair, the Contractor shallcontact the local authority to arrange remedial works.


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5. EQUIPMENT

5.1 SCREW CHILLERS - AIR COOLED

(a) General

Engage a specialist to test and commissioning the equipment, put it intooperation, and carry out from the commencement of operation until the end of themaintenance period, the maintenance procedures recommended by themanufacturer including the giving of operational instructions.

Chiller shall be low noise, air cooled condenser, screw type compressors

Each chiller set shall be a proprietary factory-assembled packaged fullyautomatic chiller set in current production, of proven performance for thespecified capacity and operating conditions, comprising screw compressor,motors, evaporators and condensers, and control panel, all mounted on acommon structural frame and equipped with the components and accessoriesnecessary for unattended automatic operation, including but not necessarily

limited to integral piping, unit-mounted controls, electrical wiring, thermometers,gauges, and the like. Arrange access and external service connections suitablefor the specified installation. The equipment shall be suitable for externalinstallation in an all weather environment.

(b) Construction Standard

The following standards (current edition) are referred to in this section:

● AS 1023 Low Voltage Switchgear and Control Gear – Protection ofElectric Motors

● AS 1044 Radio Interference

● AS 1210 SAA Unfired pressure vessels code

● AS 1359 General requirements For Rotating Electrical Machinery

● AS 1677 Refrigerating systems

● AS 2129 Flanges for pipes, valves and fittings

● AS 2279 Disturbances In Mains Supply Networks● AS 2625 Rotating and Reciprocating Machinery – Mechanical

Vibration

● AS 2372 Control Cables For Electrical Supply Systems

● AS 3000 SAA Wiring rules

● AS 3008 Electrical Installations – Selection of Cable

(c) Testing

All air-cooled chiller sets set shall meet the following requirements:

(i) Power consumption:

Measured specific power consumption shall be not more than 105% of thespecified maximum power consumption.

(ii) Capacity:

Measured capacity once adjusted using the evaporator fouling factors aslisted below shall be not less than 100% of the specified capacity.


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(iii) Acceptance test requirement:

For each chiller to be supplied, demonstrate by certified factory testmeasurements and calculations prior to delivery that the chiller set meets

the specified performance requirements at full load output in the fully fouledcondition. Use tube-fouling factors for copper tubing as follows:

Clean Fouled

Evaporator 0.0m² k/kW 0.044m²k/kW

(iv) Additional data:

Record the following during the factory test: data sufficient to identify thechiller set package, including make, model, serial number and refrigerant.

(v) Motor nameplate data:

Settings of gauges, meters, overload and safety devices, controls etc.

(vi) Pressure test:

To AS 1677, Clause 4.6. Works test refrigerant system to at least 1.5 timesworking pressure.

(vii) Refrigerant leaks:

Test for leaks with a halide torch.

(d) Requirements

Each refrigerant circuit shall be completely independent of the other such thatfailure of any refrigerant circuit shall not affect the other circuits. Each refrigerantcircuit shall include:

● Full flow refrigerant drier complete with bypass circuit;

● Moisture indicator and sight glass installed in a accessible and visiblelocation;

● Thermostatic expansion valves to be pilot operated, externally equalizedthermal expansion valves complete with solenoid valves for each stage;

● Compressor suction strainer;

● Compressor discharge muffler;

● Compressor service valves;

● 100mm diameter refrigerant suction and discharge pressure gauges and oilpressure gauge mounted in an accessible and visible location;

● Internal relief valve for the compressor;

● Oil level sight glass;

● Compressor crankcase heater;

● Oil sump plug

Each refrigerant circuit shall be connected to a shell type evaporator containingminimum 20mm diameter valved water drain and vent connections. The drainconnections shall be piped to a tundish. The evaporator shell shall be insulatedand metal sheathed and designed and constructed as a pressure vessel inaccordance with AS 1677 Clause 3.1 and AS 1210 for a certified water sideworking pressure not less than 1000 kPa and for a certified refrigerant sideworking pressure as specified in AS 1677 for the refrigerant used. Obtain acertificate of hydraulic test from the appropriate Authority. The refrigerant shall beHCFC 134a or as approved.

All water connections shall be flanged to AS 2129.


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Air-cooled condensers shall have axial or propeller fans, maximum speed, 1500RPM driven by three-phase totally enclosed motors.

Coils shall be copper tube aluminum fin mechanically bonded enclosed in a

galvanised sheet steel frame. Aluminum fins to be protected by dipped andbaked epoxy resin coating for corrosion and weatherproof protection.

Each condenser shall be equipped with its own modulating head pressurecontrol.

Supply and install internal baffles to prevent back-flow of air through fans whenmultiple fans are sequentially switched.

Each refrigerant circuit shall be equipped with its own liquid receiver designedand constructed as a pressure vessel in accordance with AS 1677, Clause 3.1and AS 1210 for a certified working pressure as specified in AS 1677 for therefrigerant use. Obtain a certificate of hydraulic test from the appropriate Authority. Each liquid receiver shall incorporate a relief valve piped toatmosphere in accordance with AS 1677.

Liquid receivers shall be sized to accommodate the full refrigerant charge of thesystem.

(e) Controls and Interlocks

Comply with AS 3000.

For each chiller provide a chiller control cubicle. Within this control cubicle mountthe interlocks, time delays, relays, motor starters, breakdown fuses, capacitycontrol, safety controls, and connections for interlocks with external pumps andflow switches and the like, necessary for safe and satisfactory operation, and forrestarting the chiller set immediately upon restoration of interrupted powersupply.

Arrange safety controls such that operation of any one will shutdown only theassociated circuit and will require manual reset before starting.

Each chiller shall be supplied and installed with its own proprietary individualmicro processor supervisory and control system complying with the chillermanufacturer’s requirements and mounted in the chiller control cubicle. Thissystem shall be designed so as not to be affected by the compressor starting andrunning currents and associated vibration.

When chiller installed exposed to the weather ensure all components protectedaccordingly and all electrical equipment in fully weatherproof enclosures.

Each supervisory system shall perform the following minimum control andmonitoring functions:

(i) Include an eighty-(80) minimum character alpha-numeric liquid crystaldisplay which spells out all system parameters in English.

(ii) Digitally programming of essential set-points through user friendly operatorinterface.

(iii) Continuously monitor entering and leaving chilled water temperatures.


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(iv) Continuously monitor the following safety controls and cutouts for eachrefrigerant circuit:

● High motor winding temperature

● High / Low refrigerant pressure● Low oil pressure

● Low leaving chilled water temperature

● Low chilled water flow

● Associated chilled water pump contactor auxiliary relay.

● Crankcase heater operation

● Provision for connection for remote alarm

(v) Automatically start, load, unload and stop the compressors, with in-builttime delays as recommended by the chiller manufacturer, as required tomaintain the leaving chilled water set point temperature ± 0.5°C providedall safety interlocks are in their correct position once a remote start signalhas been received.

(vi) Manual adjustment of the following:

● Leaving chilled water control set point

● Compressor lead/lag sequence

(vii) Display cumulative hours run for each compressor and total number ofstarts and power on meter

(viii) A manual reset push button to reset all associated safety controls for eachrefrigeration circuit

(ix) Automatically change lead/lag status of each compressor on a regularbasis to maintain equivalent hours run.

Install a voltage free changeover relay for each refrigerant circuit in each chillercontrol panel and connect all associated safety and compressor starter faults tothis relay.

(f) Crankcase Heater

Connect each compressor crankcase oil heater from separate power supply inputterminals in the associated motor control centre. This power supply shall beindependent of the chiller start sub-circuit and isolated only by a separate switchon the compressor control cubicle. Provide visible indication on chiller controlcubicle that power supply to crankcase heaters is available.


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(g) Motors/Motor Starters

Comply with AS 3000.

Compressor motors shall be screw or helical rotary, refrigerant cooled, drip proof,1500 RPM maximum and selected for 105% of the maximum operating duty ofthe compressor.

Each compressor motor shall be fitted with a starter mounted within the controlcubicle on each chiller. Motor starters shall be especially selected and matchedto the compressor motor. Select for maximum of four starts per hour and installtimers so that this is not exceeded. Compressor motor starters shall be completewith the following:

● Rated for continuous operation;

● Rated for intermittent starting duty four starts per hour minimum. Timerlockout to ensure duty not exceeded;

● Phase loss/in balance failure protection, under/over voltage protection;

● Manual reset thermal over current protection matched to the motor rating ineach active line to the motor;

● Manual reset protection of reduced voltage starter components fromoverheating;

● Separate fault indicator light for each protection element;

● All other protection and control equipment recommended by the chillermanufacturer.

(h) Selection

Chilled water pressure loss across evaporator not exceeding 60kPa at specifiedmaximum output when clean. Water velocities not exceeding 2.0m/s at specificmaximum output

(i) Refrigerant

Each chiller refrigerant shall be complete with a full charge of oil and refrigerant.

Provide any additional refrigerant which may be required during the maintenanceperiod due to failure of the system to hold the charge or other faults of thesystem.

The refrigerant shall be HCFC – 134a

(j) Installation and Maintenance

Equip the chiller with lifting eyes.

Install the chiller on ribbed neoprene, spring or inflatable air bag mounts to

ensure 98% vibration isolation.The specialist shall advise on installation and carry out commissioning of thechillers and shall standby during the first two days’ operation after commissioningto instruct the operator and adjust operating conditions if required. The specialistshall prove and demonstrate all safety cutouts after installation and service themachines as recommend by the manufacturer during the Defects Liability Periodincluding taking and testing oil samples. The specialist shall also change the oiland replace filters at the end of the Defects Liability Period.


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(k) Testing and Commissioning

Performance tests are required, tests shall make due allowance for foulingfactors in accordance with ARI 550/66 requirements, however, the nominatedcapacities are a minimum requirement.

The Principal reserves the right to inspect the chillers under manufacture andalso to witness pressure, evacuation or running tests with four (4) weeks noticegiven prior to such tests shall be given

Pre-commissioning check sheet shall be completed prior to commissioning. Acertified copy of the set-up and commissioning procedure and log sheet shall besupplied. The chillers shall be commissioned to operate in a stable mannerwithout hunting or surging throughout its operating range.

All controls shall be calibrated and all control adjustment sealed.

(l) Preventative Maintenance

The chiller manufacturer shall provide quarterly routine preventative maintenancefor the chillers during the 52 weeks Defects Liability Period and shall submit a

standard testing and maintenance schedule and a sample quarterly maintenancereport sheet with the tender proposal.

The supplier shall provide all consumable items required for this maintenanceservice including refrigerant, oil, filters, gaskets etc at no extra cost.

After each quarterly visit the supplier shall provide the following:

● A written report detailing works carried out and the condition of theequipment.

● A complete inspection and maintenance check list.


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5.2 CENTRIFUGAL PUMPS

Pump shall be of the end suction horizontal spindle horizontal split case type, of backpullout design with spacer couplings to allow impeller and bearing assembly

withdrawal without disconnection of pipework. Pump feet shall be positioned on theunderside of the casing volute.

The pump shall be fitted with packed gland seals.

Pumps shall have an integral drip tray with copper drain pipe running to the nearestfloor waste. They shall be of copper and extend beyond uninsulated pump flanges tocapture all condensate drips.

Bearings shall be self-aligning grease packed ball or roller type of ample capacitydesigned for a life or not less than 100,000 hours continuous operation. Bearingsshall be mounted in grease relief housings. All bearing housing shall be fitted withgrease nipples of the same size and type.

Each pump unless otherwise specified elsewhere, shall be direct connected to a non-overloading 24 rev/s ball bearing squirrel cage motor. Motor enclosures shall be drip

proof.

Motor shafts shall be given a multi-coat resin finish.

Pump and motor shall be assembled on a bedplate fabricated from rolled steel angleon channel sections with accurately machined facings for the pump and motor feet.The bedplate shall be dimmed or zincolate treated. The pump unit shall becompletely finished painted prior to delivery on site.

The complete assembly shall be supported from the concrete plinth on inertia typebases and vibration isolators.

Gland well drains shall be piped to the nearest floor waste


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5.3 VRV AND MULTI SPLIT AIR CONDITIONING SYSTEM

(a) General

The VRV and Multi-split system air conditioner shall be of the air-cooled type,factory assembled and furnished complete with evaporator blower, remote air-cooled condensing unit, refrigerant piping and all other related controls andaccessories

(b) Capacity

The capacity of the unit shall be rated in accordance with ARI Standard 210 andshall not be less than the minimum required when operating under the specifiedconditions. The capacity shall have to be suitably derated to take into accountany differences in level between the evaporator blower unit and the remotecondensing unit and also the length of the refrigerant piping involved

(c) Blower Fan and Motor

The evaporator blower shall be of the double-inlet centrifugal forward curved

blade type suitable for the duties to be performed. The fan shall be mounted ona steel shaft and the whole statically and dynamically balanced for quiet andvibration less operation. Bearings shall be ball-bearing type, permanentlylubricated and mounted on vibration-absorbing rubber mounts.

The fans shall be belt-driven, with adjustable sheaves and driven by AC inductionsquirrel cage motors on 380V, 3 phase, 4 wires, 50 Hz supply. Motors and fansshall be of capacity sufficient to meet all the brake horsepower requirements ofthe unit

The total belt-capacity shall not be less than 1.5 times the rating of the motor

The fan motor shall be of drip-proof construction mounted on adjustable but rigidmotor mounting bracket

(d) Compressor

Provide multiple compressors of the heavy duty suction cooled, 1450 rpm, fullhermetic, scroll or rotary type complete with forced feed lubrication, suction anddischarge service valves, suction strainer, oil level sight glass, internal reliefvalve, crankcase heater and internal 3-phase solid state thermal motorprotection. The compressors are to be mounted on 25mm deflection springvibration isolators

(e) Condensor

The condenser coils shall be of seamless copper tubes mechanically bonded toaluminum fins and tested under water to 2800 kPa with compressed air

The condenser fans, either propeller or centrifugal type, shall be designed foroutdoor operation in Tropical climate. The fan motors of single phase operationshall be PSC type with inherent over-load protection. The motors shall be rigidlymounted, adequately protected from heavy rainfall and isolated with vibrationisolation material from the rest of the condenser section

(f) Evaporator

The enclosure of the evaporator blower shall be of zinc-coated steel, zinc-phosphate bonderised and coated with oven-baked polyester pain

The evaporator coil(s) shall be of copper tubes mechanically bonded toaluminium fins and pressure tested under water to 2000 kPa with compressedair. To regulate the flow of refrigerant into the evaporation coil(s) thermalexpansion valves shall be used

The condensate drain pan shall be of heavy sheet steel, designed and mountedto ensure positive drainage of condensate under all conditions


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The condensate drain pan shall be hot dip galvanised with zinc chromatisedaluminium finish. The drain pan shall be effectively insulated to preventcondensation on its underside

(g) Filter

The air filtration of air conditioner shall consist of filter panels mounted in a filterframe. The whole filtration section shall be sealed tight to minimise air by-passing the filter media

The filter medium shall be dry type, washable, self-extinguishing and shall notsupport combustion

The filter media shall be able to regenerate at least 20 times by washing

(h) Refrigerant Circuits

Each refrigerant circuit is to be an independent circuit completely piped, tested,dehydrated and fully charged with oil and refrigerant R22, R407C or non CFCtype. The refrigerant circuits are to include compressor, condenser with integralliquid sub-cooler, liquid line service and charging valve, filter drier, and sight

glass. Compressor units to include suction and discharge line braided-wireisolators

(i) Temperature Controls

Provide each unit complete with all operating controls. Controls to be factoryinstalled, including system on/off switch and status panel. Control system to bea solid state integrated system consisting of a discharge sensor and solid statemaster control module programmed to operate all stages of cooling

(j) Unit Control Panel

The unit control panel is to be factory mounted in the unit, complete with powerand control transformers with fuses, supply fan motor and compressor contactors

(k) Disconnect Switch

Provide a non-fused disconnect switch, factory mounted on exterior of each unit


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5.4 FAN COIL UNITS

(a) General

The fan coil units shall have capacities as scheduled in the Schedule ofTechnical Data or in Tender Drawings and certified by ARI/ASHRAE.

All piping serving fan coil units shall be isolated by rubber sleeves wheresuspended or attached to the structure. There shall be no solid connectionbetween fan coil units and the structure.

The fan coil units shall be suitable for the actual resistance imposed on the airflow of the units due to ducts, grilles and diffusers. This added resistance shallbe applied to all fan coil units whether shown to have ducts connected or not,and shall be taken as a minimum of 125 Pa (external to the unit).

The fan coil units shall be of the ceiling concealed type as indicated on theSchedule of Technical Data, comprising cooling coils, direct electric motor drivencentrifugal fans and condensate drain pans.

(b) Coils

Cooling coils shall be constructed of 12mm outer diameter copper tubes withmechanically or hydraulically bonded aluminium fins. The coils shall haveworking pressure of not less than those specified in the Schedule of TechnicalData or 1000 kPa (whichever is greater). Coils shall be provided with air vents atthe highest point and a drain valve. Coils shall have the rows not less than threeand not more than four.

All coils shall be air tested with the coils submerged in water at 1.5 times of theworking pressure or 1500 kPa (whichever is greater).

(c) Fans

Each fan coil unit shall be provided with one or more statically and dynamically

balanced aluminium blade forward curved centrifugal supply air fans, which shallbe direct driven from a single phase permanent split capacitor motor.

Motors shall be of three speeds, sleeve bearing types, with accessible extendedoil tubes and oil reservoirs, and shall incorporate thermal overload protection.

The fan casings shall be constructed of galvanised steel sheets.

(d) Motors

Fan motors shall be of the ‘split-capacitor’ type suitable for single phase electricalsupply with a power factor of not less than 0.85. The motors shall be resilientlymounted to the fan tray or scrolls. The motor/fan trays assembly itself shall bealso resiliently mounted to the casing structure. The trays shall be easilywithdrawable for inspection and cleaning after disconnecting from the mains

supply and ancillaries with the plugs and sockets provided.The motors shall be capable of providing at least three fan speeds (plus on/off)and shall be of adequate capacity to prevent

Documents

06051 MANOR 2 MVAC SPEC REV 01 14022007