mintek · mintek hvac specifications rev2 mechanical engineering services 4 1 general matters 1.1...

BY:

DFR KWAKUDI

144 GENERAL BEYERS STREET

PRETORIA NORTH

GAUTENG

SOUTH AFRICA

FOR:

MINTEK

200 MALIBONGWE DRIVE

RANDBURG

GAUTENG

SOUTH AFRICA

COMPILED BY:

E. VENTER

VERIFIED BY:

D. ROODT

MINTEK

HVAC SPECIFICATIONS REV2

MECHANICAL ENGINEERING SERVICES

JUNE 2017

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TABLE OF CONTENTS

1 GENERAL MATTERS ................................................................................................................. 4

1.1 GENERAL REQUIREMENTS ................................................................................................... 4

1.1.1 NOTICE .................................................................................................................................... 4

1.1.2 STANDARD MEASUREMEMTS .............................................................................................. 4

1.2 SCOPE OF WORKS ................................................................................................................ 4

1.2.1 AIR-CONDITIONING SYSTEM AND SERVICES ..................................................................... 4

1.2.2 VENTILATION SYSTEMS ........................................................................................................ 5

1.3 CONFIRMATION OF ISSUES .................................................................................................. 5

1.4 ALTERNATIVE MANUFACTURE AND PRICES ...................................................................... 5

1.5 MATERIALS, WORKMANSHIP AND EQUIPMENT OFFERED ................................................ 6

1.6 APPROVED MANUFACTURERS ............................................................................................ 7

1.7 CONTRACTOR TO INFORM HIMSELF FULLY ....................................................................... 7

1.8 STATUTORY REQUIREMENTS, DOCUMENTATION AND DRAWINGS ................................ 8

1.9 GUARANTEE ........................................................................................................................... 8

1.10 ALLOCATED SPACE ............................................................................................................... 9

1.11 COORDINATION WITH OTHER TRADES ............................................................................... 9

1.12 BUILDER’S WORK .................................................................................................................. 9

1.13 DRAWINGS ........................................................................................................................... 10

1.14 WATERPROOFING ............................................................................................................... 12

1.15 HEALTH AND SAFETY SPECIFICATION .............................................................................. 12

2 MECHANICAL INSTALLATION ................................................................................................ 13

2.1 SITE DESIGN PARAMETERS ............................................................................................... 13

2.2 DESIGN INTENDS ................................................................................................................. 14

2.2.1 PLANT ROOM ........................................................................................................................ 14

2.2.2 OCCUPANT DENSITIES ....................................................................................................... 15

2.2.3 VENTILATION ........................................................................................................................ 16

2.2.4 HEATING AND COOLING DEMANDS ................................................................................... 17

2.2.5 PIPING ................................................................................................................................... 19

2.3 TECHNICAL STANDARDS .................................................................................................... 22

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2.3.1 PIPING ................................................................................................................................... 22

2.4 VENTILATION FANS ............................................................................................................. 22

2.4.1 DUCTING ............................................................................................................................... 23

2.4.2 AIR SYSTEM.......................................................................................................................... 24

2.4.3 CONDENSATE DRAINS ........................................................................................................ 26

2.4.4 EQUIPMENT .......................................................................................................................... 26

2.5 EQUIPMENT SCHEDULE ...................................................................................................... 29

2.6 DRAWING REGISTER ........................................................................................................... 40

3 ELECTRICAL WORK ................................................................................................................ 41

3.1 GENERAL .............................................................................................................................. 41

3.2 LV INSTALLATION ................................................................................................................ 42

3.2.1 CABLES ................................................................................................................................. 42

3.2.2 TESTING AND COMMISSIONING ......................................................................................... 43

3.3 DISTRIBUTION BOARDS ...................................................................................................... 44

3.3.1 GENERAL .............................................................................................................................. 44

3.3.2 FLUSH MOUNTED DISTRIBUTION BOARDS ....................................................................... 45

3.3.3 SURFACE MOUNTED DISTRIBUTION BOARDS ................................................................. 45

3.3.4 FREE STANDING DISTRIBUTION BOARDS......................................................................... 46

3.3.5 STANDBY SUPPLIES ............................................................................................................ 46

3.4 WIRING .................................................................................................................................. 47

3.5 CABLE SUPPORT SYSTEM .................................................................................................. 49

3.6 EARTHING AND LIGHTNING PROTECTION ........................................................................ 51

3.6.1 LIGHTNING PROTECTION .................................................................................................... 51

3.6.2 MAINS EARHING ................................................................................................................... 51

3.6.3 CLEAN EARTHING ................................................................................................................ 53

3.6.4 SURGE SUPPRESSION ........................................................................................................ 53

3.7 COMMISSIONING AND COMPLETION ................................................................................. 53

3.7.1 GENERAL .............................................................................................................................. 53

3.7.2 DRAWINGS ........................................................................................................................... 54

3.7.3 COMPLETION ........................................................................................................................ 55

4 COMMISSIONING ..................................................................................................................... 56

4.1 INITIAL VISUAL CHECK ........................................................................................................ 56

4.2 PRE-SWITCH ON CHECKS ................................................................................................... 57

4.3 POST FIRST SWITCH ON CHECKS ..................................................................................... 57

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4.4 AIR FILTERS.......................................................................................................................... 57

4.5 COILS .................................................................................................................................... 58

4.6 INSULATION .......................................................................................................................... 58

4.7 AIR-HANDLING UNITS .......................................................................................................... 58

4.8 ELECTRICS ........................................................................................................................... 59

4.9 GENERAL .............................................................................................................................. 59

4.10 AIR SYSTEMS ....................................................................................................................... 59

4.11 AS-BUILT DRAWINGS ........................................................................................................... 59

5 MAINTENANCE ........................................................................................................................ 60

5.1 OPERATING AND MAINTENANCE MANUALS ..................................................................... 60

5.2 INSTRUCTION ....................................................................................................................... 61

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1 GENERAL MATTERS

1.1 GENERAL REQUIREMENTS

1.1.1 NOTICE

a. This standard specification forms part of, and is to be read in conjunction with all drawings

relating this project as set out in the drawing register.

b. Where reference is made to “Contractor” it shall be read to mean the successful Tenderer

appointed to execute the contract specified in the supplementary specification.

1.1.2 STANDARD MEASUREMEMTS

The dimensions, weights, etc. shown on the drawings and mentioned in the specifications shall be

taken as the Republic of South Africa’s legal standard weights and measures.

1.2 SCOPE OF WORKS

The scope of work, as indicated on the drawings, and including all manufacturing, conveying and

delivering, unloading, storing, unpacking, hoisting, scaffolding, setting out, fitting and fixing in position,

cutting, waste, patterns, templates, plant, temporary works, commissioning, return of packing,

establishment charges, protection and removal thereof on completion, cleaning down complete, profit

and other obligations arising out of the conditions of this contract.

1.2.1 AIR-CONDITIONING SYSTEM AND SERVICES

The system to be installed is a chilled and heated water system with the 4 MW cooling capacity and 1.2

MW heating capacity. The scope of works include a full plant replacement and partial air handing unit

replacements. The air-conditioning system will consist of water cooled chillers, heat pumps, cooling

towers, water pumps, piping, valves, gauges, water tanks, ducting, air handling units, measurement and

control equipment.

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1.2.2 VENTILATION SYSTEMS

Filtered fresh air will be introduced to all spaces according to the National Building regulations. The

fresh air systems will consist of weather louvers, attenuators, filters, fire dampers, fresh air fans

diffusers, ducting and volume control dampers. Various extraction systems are also included in the

scope of works.

1.3 CONFIRMATION OF ISSUES

Notwithstanding anything to the contrary as may be set down in the contract Agreement, but rather as

an extension to these clauses, it will be in the interest of the Contractor to ensure that any verbal

instruction, directive, explanation, etc., given as well as any agreement made or whatever, whether it

will involve a variation or not, is confirmed in writing by the Engineer and/or the Principal Agent within

14 days of it being given or made.

Failure on the side of the Contractor to do so may invalidate any claim for a variation to the works and

additional payment.

1.4 ALTERNATIVE MANUFACTURE AND PRICES

Should the tenderer wish to offer alternative equipment, etc., the details shall be submitted in a covering

letter accompanying the tender and clearly identifying the extent, quality and advantages of the

alternative(s) shall be submitted at close of tender.

Any price submitted for alternatives, variations, extras, saving, omissions, etc., whether prior to tender

acceptance or during the construction stage of the works shall be taken to include the applicable Value

Added Tax (VAT), unless clearly identified otherwise at the time of submission.

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1.5 MATERIALS, WORKMANSHIP AND EQUIPMENT OFFERED

a. Materials and equipment offered shall be new and of the best quality and as specified herein.

Workmanship offered shall be executed in the most substantial manner under the inspection

and to the entire satisfaction of the Engineer.

b. The entire installation shall be in accordance with:

The National Building Regulations and Building Standards, Act No. 103 of 1977 as amended in 1984 and all amendments thereafter,

The latest revision of SABS 0400: The Applications of the National Building Regulations, as amended,

SANS Code of Practice for the Wiring of Premises 142 of 1981, as amended,

The Machinery and Occupational Health and Safety Act No. 85 of 1993,

Any other relevant by-laws of local or other authorities.

c. It is the responsibility of the Contractor to ensure that the quality of the workmanship and the

installation of equipment meets the requirements specified by the Engineer and that the work

is carried out in such a manner that the equipment performance meets the requirements

provided by the manufacturers and suppliers.

d. All materials shall be of the qualities specified and the Contractor shall, upon request by the

Engineer, furnish the Engineer with proof to his reasonable satisfaction that the materials are

of the specified quality. If so required, the Engineer may call for samples of the material and

equipment for approval. Such samples shall be submitted within 14 days of the request.

e. Any fittings or item of equipment not specifically mentioned but obviously necessary for the

successful completion of the installation is to be included so as to form a complete working

installation.

f. If any materials or workmanship are not in accordance with the provisions of the agreement,

then the same shall, at the cost of the Contractor, be removed and/or re-executed and all

rejected materials shall be removed from the site.

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g. The Contractor shall, if so requested, during the continuance of the contract/agreement,

keep the Contractor and the Engineer informed regarding the placing of all orders for

materials and the progress of manufacture or any article or materials.

h. Where alternatives for such materials, goods and equipment are permitted, the Contractor

shall be liable for latent defects in such materials, goods and equipment and or the cost of

making good physical loss and repairing damage to the works resulting there from.

i. No second hand equipment may be offered or installed unless it is discussed and approved

by all relevant parties.

j. Any fitting or item of equipment not specifically mentioned, but obviously necessary for the

successful completion of the installation is to be discussed with the involved engineer and

included so as to form a complete working installation.

1.6 APPROVED MANUFACTURERS

All equipment offered, must adhere to the minimum requirements as specified in the technical

specifications section of this document. It is required from all contractors to submit data sheets /

brochures including all technical specifications to the engineer at the tender stage as well as prior to

ordering.

1.7 CONTRACTOR TO INFORM HIMSELF FULLY

Notwithstanding anything to the contrary as may be set down in the Subcontract Agreement, Additional

General Conditions or the Principal Building Agreement, any costs arising out of failure by the

Contractor to assess the conditions and circumstances of the site and/or the works shall be borne by

the Contractor.

By submission of a tender the Tenderer will be deemed to have acquainted himself fully with the tender

document, local requirements and laws and all aspects of the work envisaged in the documents prior to

the submission of his tender.

The Tenderer is advised to inspect the drawings of the works which will be made available as no claim

of whatever nature, arising out of his failure to do so, will be entertained.

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1.8 STATUTORY REQUIREMENTS, DOCUMENTATION AND DRAWINGS

Further to the Additional General Conditions, the complete works shall comply in particular with the

specifications and requirements of:

a. The Occupational Health and Safety Act, Act 85 of 1993, as amended.

b. The Application of the National Building Regulations, SANS 10400, as amended.

c. The SANS code of practice 10142, as amended (Wiring of Premises).

d. This detailed specification and the Engineer’s drawings forming part of the tender

documents.

Items (a) to (c) shall preference over all other specifications and requirements.

However, any deviation from this specification shall immediately be reported to the Engineer.

The works shall furthermore comply with all the requirements and bylaws of the relevant local authority.

Where the proposed layouts, or any of the materials specified, etc., do not comply with these

regulations, the matter shall immediately be brought to the attention of the Engineer.

Certificates of approval/ inspection from the local authority shall, if called for, be submitted to the

Engineer before the final payment certificate will be issued. The Contractor shall furthermore issue all

notices and pay all fees required to be given or paid in terms of statutory and regulatory requirements

and the relevant local authority’s bylaws.

1.9 GUARANTEE

The Contractor shall guarantee the works against defects for a period of one (1) year from date of

practical completion.

The guarantee shall cover all defects to the works and shall provide for the replacement or repair of all

components that become defective during the guarantee period. Consumable components are

excluded from the guarantee.

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1.10 ALLOCATED SPACE

The physical sizes of the equipment offered shall be suitable for the locations shown on the drawings

and shall be positioned in such a manner to ensure reasonable access all around the equipment for

maintenance purposes and as may be recommended by the suppliers of the equipment.

The Contractor shall, at tender stage, check and ensure that enough space has been allocated for the

erection of his equipment and services, taking note of other services sharing the same space. Should

the spaces indicated on the Engineer’s drawings not be adequate, the tenderers shall at the time of

tender advise the Engineer accordingly and, where relevant, submit with their tenders a sketch

indicating the required space.

1.11 COORDINATION WITH OTHER TRADES

The Contractor shall plan his work in advance and shall coordinate all space requirements in

conjunction with the Principal Agent, especially where other trades share the same space. Where

conflicts occur, the Contractor shall request clarification from the Engineer.

1.12 BUILDER’S WORK

The successful Tenderer shall, within two weeks of acceptance of his tender, provide the Engineer with

all Builder-provided work such as holes, machine bases, chases, recesses, service ducts, wooden

sleeves and frames, etc., as herein identified being provided by others and which will be required to

accommodate his services.

No structural element shall be erected and no holes shall be cut or made through the structure and no

items of equipment shall be supported from the structure without the prior approval of the Engineer.

Where foundations, machine bases, drained ducts, floor channels, cable sleeves, etc., have been

identified herein to be provided by others, the Contractor shall liaise and assist the Principal Agent or

others in setting out, locating, etc., of these items.

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1.13 DRAWINGS

The Engineer’s drawings and specifications shall be considered binding with regard to the quality,

quantity, general scheme system, arrangement and function of the n/s works. All dimensions specially

marked on the drawings shall be strictly followed.

Any discrepancy between the drawings, specification and schedules shall be drawn to the attention of

the Engineer by the (Sub) Contractor immediately if such discrepancy is discovered.

The Engineer shall provide such information as may be necessary to enable the shop drawings to be

prepared and the equipment to be selected by the (Sub) Contractor and the Engineer shall examine

technical proposals and drawings from the (Sub) Contractor for conformity with design and

specification. Such examination shall exclude detailed checking of detailed coordination and installation

fit.

Any work installed before approval of working drawings may be liable for removal at the Engineer’s

discretion.

During the execution of the works the Contractor shall make available on site a full set of the approved

shop drawings, schedules and specifications

As-built drawings shall be prepared and submitted to the Engineer for approval prior to the beneficial

occupation inspection.

a. Contractor's drawings

These drawings shall at least consist of:

Builder's work drawings

These shall indicate all work to be done by others (bases, foundations, holes in concrete and

masonry, etc.) as well as the sizes, capacities and positions of service connections

(electrical, water, drainage, etc.) to be provided by others, all in accordance with the

supplementary specification.

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General arrangement drawings

These shall indicate all equipment, distribution systems, testing and inspection requirements

as well as instrumentation positions and access requirements.

During their preparation, the Contractor shall take cognizance of all relevant architectural,

structural, electrical and other services drawings in order to properly co-ordinate his layout.

The drawings shall be amended as required during the contract period, and up to date copies

kept on site for reference purposes.

Positions and sizes of air grilles, louvers openings through reinforced concrete beams and

slabs, etc., as indicated on the tender drawings shall be adhered to as far as possible.

Amendments will only be considered if absolutely unavoidable.

Shop drawings

These shall be based on the General Arrangement drawings, and shall show in detail the

construction of all the parts of the works, method of assembly where applicable, erection and

construction, materials and connections, welds, gaskets, sealants, fastenings, reinforcing and

all other necessary detail.

Electrical drawings

Electrical drawings shall comprise complete control and power wiring diagrams, as well as

front and side elevations giving major dimensions of control panels as well as instrumentation

and switch position layouts.

As-Built drawings and wiring diagrams

These are up-to-date approved drawings at the completion of the contract. Tenderers shall

allow in their price for submitting to the Engineer a sepia of each of the up-to-date general

arrangement drawings, shop drawings, as well as electrical drawings together with the O&M

manuals specified herein.

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1.14 WATERPROOFING

Where any work pierces waterproofing, including waterproof concrete and roofing, the method of

installation shall be approved by the Architect and/or Engineer before the work is carried out.

All necessary sleeves, caulking, skirts, soaker sheets, flashing, etc., required to make the openings

absolutely water-tight shall be provided by the Contractor, but shall be handed over to others for

installation.

1.15 HEALTH AND SAFETY SPECIFICATION

Tenderers shall allow in their costing for the preparation of a Health and Safety Plan in accordance with

the OHS Act 85/1993, as amended, Construction Regulations (July 2003), and all other relevant

legislation that may relate to their activities directly or indirectly. This H&S plan is to be discussed with,

and approved by, the Principal Agent, on award of the Contract. The Contractor shall be registered

with the Workman’s Compensation Commissioner. The Contractor’s H&S Plan shall be implemented

and maintained and include, amongst others, at least monthly audits.

The Tenderers shall, in costing their H&S Plan, prepare a risk assessment specific to their operations,

such as amongst others, but not restricted to, demolition work, edge protection and penetrations,

stacking of materials, speed restriction and protection, construction plant, fire extinguishers and

firefighting equipment, hired plant and machinery, scaffolding, working on heights, lifting machine and

tackle, ladders and ladder work, general machinery, portable electrical tools, explosive power tools,

public health and safety and night work.

The Principal Agent and all Contractors shall submit an organogram, outlining the Health and Safety

Site Management Structure including the relevant appointments/competent persons. In cases where

appointments have not been made, the organogram shall reflect the intended positions. The

organogram shall be updated when there are any changes in the Site Management Structure.

The Principal Agent and all Contractors shall ensure that Health and Safety Representative(s) are

appointed under consultation and trained to carry out their functions.

The appointment must be in writing. The Health and Safety Representative shall carry out regular

inspections, keep records and report all findings to the Responsible Person forthwith and at health &

safety meetings.

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The Principal Agent and all Contractors shall keep and maintain Health and Safety records to

demonstrate compliance with this Specification, with the OHS Act 85/1993, as amended and with the

Construction Regulations (July 2014). The Principal Agent shall ensure that all records of

incidents/accidents, training, inspections, audits, etc. are kept in a health & safety file held in the site

office. The Principal Agent must ensure that every Contractor opens its own health & safety file,

maintains the file and makes it available on request.

2 MECHANICAL INSTALLATION

2.1 SITE DESIGN PARAMETERS

Fundamental heat load calculations are based on the following site design parameters.

Building Information

Site location Randburg

Altitude 1694 m

Main occupancy group (SANS10400) Group G1

Climatic zone (SANS204) Zone 1

Construction status Constructed

Building orientation Facing north

Windows Glazing installed

Estimated area to be air-conditioned 38 151 m2

Climatic Information

Parameter Value Unit

Summer

Average outdoor high temperature 27 [˚C]

Average outdoor low temperature 14 [˚C]

Average outdoor humidity 65 [%]

Winter

Average outdoor high temperature 18 [˚C]

Average outdoor low temperature 2 [˚C]

Average outdoor humidity 50 [%]

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2.2 DESIGN INTENDS

The completed work shall, where applicable, conform in all respects to that criteria and its operation

shall be measured against that criteria during the practical and final completion inspections. The air

conditioning system as well as the ventilation and extraction are primarily designed according to

SANS10400 – building regulations and SANS204 – energy efficiency in buildings.

2.2.1 PLANT ROOM

The total heat load for plant room equipment are primarily based on the existing occupant divisions as

per architectural drawings and categorized as follows:

Heat Gains

Category Internal External

High Laboratory

Kitchen

Auditorium

Board room / meeting room

IT room / server room

Printing room

Gymnasium

Windows facing North

Air renewal rate > 15

Moderate Office space

Lobby areas

Reception areas

Dining areas

Windows facing East / West

Air renewal rate > 10

Low Library

Passages

Windows facing South

Air renewal rate < 10

The plant room configuration consists of three water cooled chillers and two respective cooling towers,

two heat pumps offering simultaneous and independent production of hot and cold water, two cold

water supply pumps (n+1), two hot water supply pumps (n+1) and two condenser pumps (n+1).

The following factors were taken into account:

Heat / Cooling load design factor: 1.10 [-]

Occupant diversity factor: 0.70 [-]

Water flow safety factor: 1.05 [-]

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2.2.2 OCCUPANT DENSITIES

Occupant densities obtained from SANS 10400 building regulations used for design purposes:

Zone Categories

Description [-] Design Code [-] Density [m² / person]

Office space a 12

Lobby area b 20

Library c 20

Board room d 3

Training room e 3

IT rooms f 20

Printer area g 20

Dining area h 4

Laboratory i 8

Storage j 20

Bathroom k 3

Kitchenette l 9

Out of Scope m 0

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2.2.3 VENTILATION

Fresh air requirements:

Fresh air and extraction flow rate requirements:

Occupancy description Air changes per hour [1/h] Rate per person [l/s]

Air Supply

Library and book stock 2 7.5

General office space 2 7.5

Waiting areas 2 7.5

Conference and board rooms 10 10

Cleaners’ rooms 10 1

Dining rooms and cafeterias 10 7.5

Training rooms 2 7.5

Locker rooms 15 7.5

Air extraction

Medical treatment area 12 -

Laboratories 6 7.5

Public kitchens 20 17.5

Kitchenette 10 50

Bathrooms and shower rooms 20 20

Toilet rooms 20 20

All rooms with an effective natural ventilated opening area larger than 5% of the applicable rooms’ floor

area is not required to be artificially ventilated. However, for the purpose of this design, it is assumed

that all windows are closed under normal operating conditions.

Ducting:

Airflow design limitations:

2 – 4 [m/s] in indoor visible ducting

4 – 6 [m/s] in indoor ducting located in the ceiling void

6 – 8 [m/s] in ducting located outside of the building where noise is not a concern.

Round or spiral ducting shall be used as far as possible and will be constructed from galvanized sheet

metal. Should it not be feasible at any part of the installation, rectangular ducting with the same

corresponding hydraulic diameter may be used after confirming all changes with the engineer. Flexible

ducting will only be used as a connection between the galvanized ducting and the air handling unit,

diffuser or air grille.

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Diffusers:

Air supply and extraction diffusers shall be of the round plate type with adjustable airflow (Not

motorized). Return air grilles for ducted air conditioning units should be the same size of one ceiling tile

(600x600mm - to be confirmed by architect).

Fans:

Localized fresh air fans (in line axial flow) to supply fresh air to various rooms and air conditioning units.

Extraction shall be done by means of a central extraction fan (centrifugal mounted on the roof) for room

extraction. Each canopy extraction unit will be fitted with a separate fan (centrifugal mounted on the

roof) and start / stop next to the canopy.

Additional design parameters:

Window opening factor: 75 [%]

Diffuser static pressure: 40 [Pa]

2.2.4 HEATING AND COOLING DEMANDS

Internal heat gains:

Internal heat gains

Description

[-]

Design code

[-]

Occupant

[W / person]

Equipment

[W/m²]

Lighting

[W/m²]

Office space a 145 8 12

Lobby area b 165 6 10

Library c 150 8 12

Board room d 140 12 15

Training room e 145 15 10

IT rooms f 145 250 12

Printer area g 155 150 10

Dining area h 160 2 10

Laboratory i 155 85 10

Storage j 135 5 8

Bathroom k 135 10 8

Kitchenette l 140 200 8

Out of Scope m 0 0 0

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External heat gains:

External heat gains

Description Value Unit

Specific heat of air 1.004 [kJ/kg.K]

Specific heat of water vapor 1.996 [kJ/kg.K]

Density of moist air 0.966 [kg/m²]

Indoor design temperature 22 [˚C]

Outdoor design temperature 32 [˚C]

Window solar heat gain coefficient 0.48 [-]

Window heat resistance coefficient 0.40 [-]

North side window shading 75 [%]

East side window shading 0 [%]

South side window shading 5 [%]

West side window shading 0 [%]

North side orientation factor 1.0 [-]

East side orientation factor 0.6 [-]

South side orientation factor 1.0 [-]

West side orientation factor 0.8 [-]

De-Humidification:

Internal moisture gains

Description [-] Design Code [-] Occupant moisture gain

[l/h/p]

Office space a 0.12

Lobby area b 0.15

Library c 0.08

Board room d 0.12

Training room e 0.08

IT rooms f 0.12

Printer area g 0.12

Dining area h 0.12

Laboratory i 0.12

Storage j 0.12

Bathroom k 0.2

Kitchenette l 0.2

Out of Scope m 0

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Areas excluded from air conditioned spaces:

Stairways

Store rooms

Toilets and bathrooms

Oven rooms

Parking

Auditorium

Renovated areas (Block 7000 level 7 & 8)

Additional design parameters:

Site specific radiation: 584 [W/m²]

Indoor climatic range: 21 [˚C] to 26 [˚C] at 50% relative humidity

Air handling units:

Localized 4-pipe air handling units connected in a reverse return configuration will be installed in all air

conditioned spaces, including:

Mid-wall units.

Cassette units.

Hideaway units.

Cassette and Hideaway air handling units must be fitted with a fresh air intake and be available in

ranges from 7000 BTU/h to 65000 BTU/h. All air handling units will be controlled from a wall mounted

controller located near the unit.

2.2.5 PIPING

Main water piping and branch water piping shall be constructed of galvanized steel (schedule 20). Main

piping shall be flanged connected with a maximum length of 3m and insulated with fiberwool (minimum

thickness of 25mm). Branch piping will have threaded connections and insulated with neopene

(minimum thickness of 13mm)

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The system is a 4-pipe system with the following main lines:

Cold supply.

Cold return.

Hot supply.

Hot return.

Main pipeline layout from supply manifold to return manifold:

Main Pipeline numbering

Pipeline Description Destination Color

Cold Line 1S Cold water supply Block 6000 Light blue






Cold Line 1R Cold water return Block 6000 Light blue






Hot Line 1S Hot water supply Block 6000 Orange






Hot Line 1R Hot water return Block 6000 Orange






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Main Pipe Water Flow Rates

Block [-] Area [m²] Cold Water Flow [l/s] Hot Water Flow [l/s]

6 000 9 316 33.64 14.21

7 000 6 261 19.06 7.75

8 000 4 139 22.58 7.24

9 000 11 708 43.08 20.15

11 000 6 727 29.78 12.37

Total 38 151 148.14 61.72

Block 7000 Branch Pipe Water Flow Rates

Level [-] Area [m²] Cold Water Flow [l/s] Hot Water Flow [l/s]

3 782.6 4.29 1.60

4 782.6 3.92 1.48

5 782.6 3.92 1.48

6 782.6 3.92 1.48

7 782.6 NA NA

8 782.6 NA NA

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2.3 TECHNICAL STANDARDS

2.3.1 PIPING

Pipe supports

All piping supports shall be of galvanized steel or other corrosion resistant material. Support intervals

shall not be greater than 1.5 m.

Metal supports shall be thermally insulated by means of thermal breaks from the water piping to prevent

heat loss or gain and to prevent condensation of moisture on the pipe supports.

Pressure testing

All piping circuits shall be tested to a pressure of at least 1.5 times working pressure for duration of 4

hours. No static pressure loss shall be acceptable during the test period.

All pressure tests shall be witnessed and certified by the Engineer or an approved nominee. At least 1

week written notice to the engineer is required.

Piping insulation

Insulated pipe work penetrating through masonry or concrete elements shall have its insulation

extended right through the penetration to ensure the vapor proof integrity of the insulation. All

penetrations shall be sealed and caulked to approval by the Contractor.

All insulated water piping exposed to sunlight shall be protected with sheet metal covers to prevent UV

degrading of the insulation material.

2.4 VENTILATION FANS

Only good quality fans, from recognized manufacturers and suppliers with established local

representation, and of the types as specified hereafter, shall be acceptable.

Alternative types of fans, suitable for the application and with dimensions to suit the allocated

equipment spaces, may be offered to provide the most economical solution.

The fans offered shall nevertheless meet the specified air flow rates at the indicated system resistance.

Fan efficiencies shall under no circumstances be less than 60 [%].

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Fresh air supply systems shall be complete with washable primary air filters.

Tenderers are to note that the fan total/static pressures indicated in the equipment schedules are to be

used as a guideline at tender stage only.

The required pressures are to be re-calculated by the Contractor to allow for the equipment, as well as

any modifications to the duct sizes and routes, etc., offered by the Contractor. If the Contractor is

unable to calculate the new system resistance, the Engineer will do so, provided all the required

information is made available by the Contractor. It shall nevertheless be the Contractor’s responsibility

to ensure that the system resistance of the new/altered duct layout is calculated and allowed for.

Fans with motors larger than 1 kW shall be internally sprung within their casings, or shall be fitted with

anti-vibration mountings.

The fans and their associated equipment offered shall meet the sound levels specified herein.

Tenderers or their suppliers shall calculate the noise levels generated by the offered fans, prior to close

of tenders, and, if necessary, provide proprietary made attenuators down- and/or upstream of the fans,

whether shown on the drawings or not.

2.4.1 DUCTING

All ducts shown on the drawings, specified or required for the various systems shall be provided by the

Contractor.

Material

The ducts shall be manufactured from galvanized sheet metal in accordance with the specifications and

requirements for low pressure ducts as per SANS 10147 and 1238, as amended, and shall be installed,

balanced and tested as per SANS 10173, as amended. Where the SANS standards are silent, or

unclear on a particular aspect, the SMACNA standard for low pressure ducts shall be applicable.

Duct size

Where changes in the duct sizes indicated on the Engineers drawings are required, due to particular

site conditions or requirements, the new sizes shall be determined using equivalent hydraulic diameters

and not cross-sectional areas. Rectangular duct aspect ratios in excess of 4:1 shall not be allowed. The

minimum internal rectangular duct dimension for low and medium velocity ducting shall be 200 [mm].

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Duct mounting

All hangers, brackets and other duct supports required for the installation of the ducts shall be

manufactured from galvanized mild steel. Where the galvanized finish is damaged by cutting, drilling,

etc., it shall immediately be painted with cold galvanizing.

All external ducts shall be joined by means of transverse flanged duct joints, such as the MEZZ flange

system. Flanged joints shall be sealed by means of a gasket or non-hardening mastic sealant applied

between the flanges.

The top surfaces of external ducts shall be sloped to ensure water run-off. Under no circumstances

shall water be allowed to pool on top of the ducts, especially at the flanges.

Internal ducts may be joined by means of transverse flanged duct joints, such as the MEZZ flange

system, or slip (S and Drive) type joints. All internal duct joints shall be sealed with non-hardening

mastic sealant, gaskets or external tape.

Duct insulation

Duct insulation shall generally be in accordance with SANS 0173, as amended.

All conditioned supply and return air ducting in ceiling voids (AC hideaway unit 130, 201, 203 and 218)

shall be flanged and generally be externally insulated with 25 [mm] thick thermal insulation, complete

with aluminum foil vapor barrier (FRK). The insulation shall be fixed over its full area with adhesive

suitable for bonding between fibreglass blanketing and galvanized sheet metal and shall, in addition, be

mechanically secured at maximum intervals of 400 [mm] with nylon strapping, or by means of spot

welded pins with securing washers/heads of diameter not less than 30 [mm].

2.4.2 AIR SYSTEM

Damper quadrants

Volume and splitter dampers shall have substantial locking quadrants. Quadrants shall be mounted

outside the ducts in accessible positions.

Quadrants to dampers located in insulated ducts shall be fixed to bearing plates which are flush with

the outside finish of the insulation. The open and closed positions of the dampers shall be indicated on

the quadrant units.

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Fresh air intakes

Fresh air intakes shall be weatherproof, is more than 500 [mm] off any floors, roofs or outside ground

levels, and shall be complete with galvanized bird-proof wire mesh.

The frames and blades of these louvers shall be constructed from extruded aluminum sections,

mechanically bonded together into a rigid louver assembly. The louver shall withstand penetration of

water and the sealing gasket shall be factory fitted on the louver flange. The louver blades shall be of

the "Z" profile type and shall be horizontally fitted into the surrounding mounting frame. A 20 [mm] non

visible plastic bird-proof mesh shall be provided behind the louver blades to prevent debris passing the

louver. The depth of the louvers shall not exceed 35 [mm].

The louvers shall be fixed to galvanized sheet metal sleeves (1.6 [mm] thick). The sheet metal sleeves

shall be provided by the air-conditioning contractor. They shall be finished in epoxy powder coated paint

to the Architects color detail.

Flexible connections

Flexible connections shall be provided at the junctions between all fans, attenuators, air-conditioning

units or other vibration inducing equipment and ducts.

The flexible connections shall be manufactured from non-combustible material approved by the local

authorities, and shall be complete with bolted flanges to join the two component sections. Care shall be

taken in the mounting and support of the ducts joined by flexible connections to ensure that no strain is

placed on the material during static and dynamic operating conditions.

External flexible connections shall be protected from direct sunlight with galvanized sheet metal cover

strips.

Flexible connections to ducting conveying conditioned air shall be externally insulated with 25 [mm]

thick thermal insulation, complete with aluminum foil vapor barrier (FRK).The insulation shall be

mechanically secured at maximum intervals of 200 [mm] to the adjoining ducting by means of spot

welded pins with securing washers/heads of diameter not less than 30 [mm].

Flexible ducts

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Flexible round ducts shall only be used for connecting Air conditioning, diffusers and grilles to the

supply, return and extract air ducts. Therefore, final bends to the air conditioning units and various

diffusers shall be by means of flex ducting and not galvanized sheet metal ducting.

Flexible ducts shall be factory manufactured from non-combustible, wire reinforced, aluminum material,

acceptable or approved by the relevant local authorities. Each flexible duct section shall have a

maximum length of 1.5 [m] and have no more friction loss factors than the equivalent of two 90° bends.

Bends shall be of the maximum possible radius without flattening or distorting the duct. Flexible ducts

shall be joined to the sheet metal duct and diffusers with suitable clamps and duct sealant.

Flexible ducts conveying conditioned air shall be of the insulated acoustic type, equal to Advantage Air

Whispaflex.

Air registers

The Contractor shall provide all air registers (supply, return, fresh air, louvers and diffusers) as required

and indicated on the drawings. They shall be supplied by reputable manufacturers with well-established

local representatives. Where air flow through an air registers needs to be set, the register shall be

complete with an opposed bladed damper (grilles) or other integral damper (diffusers).

2.4.3 CONDENSATE DRAINS

The Contractor shall supply and install all condensate drain piping required for the works.

Others shall only provide a trapped connection point in the relevant ceilings directly above the

connection to the buildings waste drainage system, unless otherwise indicated on the drawings.

The internal condensate lines shall have a minimum fall of 1:100.

The drain lines from individual air-conditioning units shall be trapped and have a minimum internal

diameter of 15 [mm] (pipe diameter to match respective indoor and outdoor units).

Internal condensate drain lines shall be in PVC piping insulated with neoprene in order to prevent

condensate dripping on ceiling tiles.

2.4.4 EQUIPMENT

Fixing

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All lightweight fixing to brick or concrete shall be made with steel screws and "Fischer" or other

approved plugs. Holes of the requisite size for the plugs, which shall suit the screws used, are to be

neatly drilled in the concrete or brickwork (not in the joints between bricks) to a depth excluding plaster

or soft wall finish equal to at least the length of the plugs. The plug lengths shall be such that all the

threaded length of the screws is in the plugs.

Fixings to timber shall be made with greased brass wooden screws. For fixing to hollow tiles, etc.,

screw anchor type fixings shall be used, fitted as above as far as possible. Fixing to soft or hard fiber

boards, etc., which are inaccessible to the back, shall be made with sherardized self-tapping screws of

appropriate sizes.

All heavy weight fixings (more than 25kg) to brick or concrete shall be by means of appropriately sized

grouted galvanized / stainless steel bolts or by one of the various types of suitable expanding bolt

fixings. After erection of equipment all exposed metalwork of fixings shall be treated with two coats of

paint to match the finish of the equipment. Bolts shall in all instances be secured by means of a washer

on the bolt head side and a lock washer on the nut side of the items being bolted.

Where the Contractor is in any way uncertain of the method of fixing of any plant or material, the

proposed fixing and loading involved shall be cleared with the Engineer prior to carrying out the work on

site.

Vibration insulation

Unless otherwise noted on the equipment schedules hereafter, all mechanical equipment, i.e.

machinery, piping, ducting, etc., shall be mounted on vibration isolators to prevent the transmission of

vibration and mechanically transmitted sound to the building structure.

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Corrosion precautions and finishes

All materials such as brackets, hangers, etc., shall be shot blasted, pre-painted, galvanized or treated

against corrosion prior to their delivery to site. Any work that will require site cutting, etc., i.e. exposure

of the bare steel to the atmosphere, shall immediately be treated by cold galvanizing, painting, etc.

The method of treatment for the above shall depend on the particular environment and type of surface

to be coated. The surface preparation, primer coats, finishing coats, etc. shall therefore be in

accordance with those specified by reputable paint manufacturers.

Each application shall be allowed to dry completely before the next coat is applied. The only exception

to these stipulations shall be in the case of subcontracts, where the Contractor shall only apply the

primer coats and the Principal Agent the finishing coats.

Color coding shall follow the coding currently used on site. If no color coding is in use, or in the case of

new installations, the latest SANS 10173 (clause 6) and SANS 10140 Standards shall be used.

Plant and equipment, pre painted or pre primed at the factory shall be examined to ensure that the paint

finishes are in a good condition. If not satisfactory, priming paint or finishing coats shall be removed

where necessary, the surface cleaned to remove rust, and all such surfaces re-primed and finished in

two coats of high quality paintwork to match the original.

The contractor shall fix black on white ivorine labels to all items of equipment (machinery, fans, pumps,

electric heater batteries, humidifiers, air handling units, outdoor condensers, etc.), as well as to all

active valves (motorized and solenoid) and major isolating valves.

The labels shall be screwed or pop-riveted to the equipment and attached to the valves with steel

cables. The lettering shall not be less than 10 mm in height and the wording shall be approved by the

Engineer. The wording and tag numbers shall be the same as those used in this specification and

indicated on the drawings.

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2.5 EQUIPMENT SCHEDULE

Chillers

Chillers

Unit Tag

[-]

Type

[-]

Location

[-]

Thermal

Capacity

[kW]

Max Pressure

Drop

[kPa]

Max Water

Flow

[l/s]

Min EER

[-]

Max

Dimensions

[m]

CH01 Water cooled Plant room 671 37 30 4.9 4x1.5x1.8m



Heat pumps

Heat pumps

Unit Tag

[-]

Type

[-]

Location

[-]

Thermal

Capacity

[kW]

Max Pressure

Drop

[kPa]

Max Water

Flow

[l/s]

Min COP

[-]

HP01 Air cooled Outside 712 45 30 3.2

HP02 Air cooled Outside 712 45 30 3.2

Water pumps

Water pumps

Unit Tag

[-]

Description

[-]

Type

[-]

Max Flow

[l/s]

Max Head

[m]

Water Temp

Range

[˚C]

Estimated

Motor Size

[kW]

CWSP01 Cold water supply primary Centrifugal 148.3 20.6 6 to 12 42.9

CWSP02 Cold water supply backup Centrifugal 148.3 20.6 6 to 12 42.9

CP01 Condensate water primary Centrifugal 86.4 16.9 25 to 35 20.5

CP02 Condensate water backup Centrifugal 86.4 16.9 25 to 35 20.5

HWSP01 Hot water supply primary Centrifugal 61.7 23.9 40 to 50 20.7

HWSP02 Hot water supply backup Centrifugal 61.7 23.9 40 to 50 20.7

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Cooling towers

Cooling towers

Unit Tag

[-]

Description

[-]

Type

[-]

Thermal

Capacity

[kW]

Max Pressure

Drop

[kPa]

Max Water

Flow

[l/s]

CT01 CH01, 02, 03 Closed - Wet 1150 100 50.0

CT02 CH01, 02, 04 Closed - Wet 1150 100 50.0

Fan units

Fan units

Unit Tag

[-]

Type

[-]

Description

[-]

Location

[-]

Air Flow

[l/s]

Static

Pressure

[Pa]

Ducting

Diameter

[mm]

SF01 Axial InLine Supply Fan Level 3 850 320.0 450




EF01 Centrifugal Extraction Fan Roof 2000 295.0 700








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Air handling units

Air handling units

Unit Tag

[-]

Type

[-]

Total Air Flow

[l/s]

Fresh Air

Supply

[l/s]

Design

Capacity

[kW]

Install

Capacity

[BTU]

Water flow

[l/s]

AC401 Casette 128.2 42.5 2.7 9000 0.13

AC402 Hide-away 569.8 308.7 11.5 40000 0.56

AC403 Hide-away 569.8 0.0 12.8 40000 0.56

AC404 Hide-away 427.4 228.4 8.9 30000 0.42

AC405 Hide-away 783.5 132.3 15.9 55000 0.77

AC406 Hide-away 712.3 172.1 15.2 50000 0.70

AC407 Hide-away 925.9 0.0 19.1 65000 0.91

AC408 Cassette 256.4 35.2 5.2 18000 0.25

AC409 Cassette 256.4 35.2 5.2 18000 0.25

AC410 Cassette 256.4 35.2 5.2 18000 0.25

AC411 Cassette 256.4 35.2 5.2 18000 0.25

AC412 Hide-away 341.9 0.0 6.9 24000 0.34

AC413 Hide-away 427.4 0.0 8.8 30000 0.42

AC414 Cassette 199.4 24.7 3.9 14000 0.20

AC415 Cassette 256.4 37.5 4.9 18000 0.25

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Air handling units

Unit Tag

[-]

Type

[-]

Total Air Flow

[l/s]

Fresh Air

Supply

[l/s]

Design

Capacity

[kW]

Install

Capacity

[BTU]

Water flow

[l/s]

AC301 Cassette 128.2 42.5 2.7 9000 0.13

AC302 Hide-away 569.8 308.7 11.5 40000 0.56

AC303 Hide-away 569.8 0.0 12.8 40000 0.56

AC304 Hide-away 427.4 228.4 8.9 30000 0.42

AC305 Hide-away 783.5 132.3 15.9 55000 0.77

AC306 Hide-away 712.3 172.1 15.2 50000 0.70

AC307 Hide-away 925.9 0.0 19.1 65000 0.91

AC308 Cassette 256.4 35.2 5.2 18000 0.25

AC309 Cassette 256.4 35.2 5.2 18000 0.25

AC310 Cassette 256.4 35.2 5.2 18000 0.25

AC311 Cassette 256.4 35.2 5.2 18000 0.25

AC312 Hide-away 341.9 0.0 6.9 24000 0.34

AC313 Hide-away 427.4 0.0 8.8 30000 0.42

AC314 Cassette 199.4 24.7 3.9 14000 0.20

AC315 Cassette 256.4 37.5 4.9 18000 0.25

AC401 Cassette 128.2 42.5 2.7 9000 0.13

AC402 Hide-away 569.8 308.7 11.5 40000 0.56

AC403 Hide-away 569.8 0.0 12.8 40000 0.56

AC404 Hide-away 427.4 228.4 8.9 30000 0.42

AC405 Hide-away 783.5 132.3 15.9 55000 0.77

AC406 Hide-away 712.3 172.1 15.2 50000 0.70

AC407 Hide-away 925.9 0.0 19.1 65000 0.91

AC408 Cassette 256.4 35.2 5.2 18000 0.25

AC409 Cassette 256.4 35.2 5.2 18000 0.25

AC410 Cassette 256.4 35.2 5.2 18000 0.25

AC411 Cassette 256.4 35.2 5.2 18000 0.25

AC412 Hide-away 341.9 0.0 6.9 24000 0.34

AC413 Hide-away 427.4 0.0 8.8 30000 0.42

AC414 Cassette 199.4 24.7 3.9 14000 0.20

AC415 Cassette 256.4 37.5 4.9 18000 0.25

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Air handling units

Unit Tag

[-]

Type

[-]

Total Air Flow

[l/s]

Fresh Air

Supply

[l/s]

Design

Capacity

[kW]

Install

Capacity

[BTU]

Water flow

[l/s]

AC501 Cassette 199.4 68.0 4.0 14000 0.20

AC502 Cassette 170.9 48.0 3.1 12000 0.17

AC503 Cassette 256.4 37.5 4.9 18000 0.25

AC504 Cassette 199.4 24.8 3.9 14000 0.20

AC505 Hide-away 256.4 56.1 6.0 18000 0.25

AC506 Cassette 170.9 48.0 3.1 12000 0.17

AC507 Hide-away 783.5 148.6 16.2 55000 0.77

AC508 Cassette 128.2 42.4 2.8 9000 0.13

AC509 Cassette 128.2 42.4 2.8 9000 0.13

AC510 Cassette 99.7 29.4 2.0 7000 0.10

AC511 Cassette 99.7 29.4 2.0 7000 0.10

AC512 Hide-away 783.5 148.6 16.2 55000 0.77

AC513 Hide-away 783.5 148.6 16.2 55000 0.77

AC514 Cassette 99.7 29.4 2.0 7000 0.10

AC515 Cassette 99.7 29.4 2.0 7000 0.10

AC516 Hide-away 712.3 407.1 15.4 50000 0.70

AC517 Hide-away 569.8 108.1 12.0 40000 0.56

AC518 Midwall 128.2 0.0 1.5 9000 0.13

AC601 Hide-away 854.7 223.9 17.4 60000 0.84

AC602 Hide-away 427.4 138.1 7.6 30000 0.42

AC603 Midwall 199.4 0.0 4.1 14000 0.20

AC604 Hide-away 427.4 138.1 7.6 30000 0.42

AC605 Hide-away 427.4 138.1 7.6 30000 0.42

AC606 Hide-away 854.7 143.7 16.6 60000 0.84

AC607 Hide-away 854.7 145.9 17.1 60000 0.84

AC608 Cassette 427.4 194.0 7.8 30000 0.42

AC609 Cassette 427.4 226.1 8.7 30000 0.42

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Air registers

Air registers

Unit Tag

[-]

Description

[-]

Type

[-]

Air Flow

[l/s]

DF301 Extraction Round adjustable flow 100.0

DF302 Fresh air Round adjustable flow 7.9



DF305 AC air Round adjustable flow 227.9





























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Unit Tag

[-]

Description

[-]

Type

[-]

Air Flow

[l/s]


















DF351 Return air Standard square grille 227.9












DF363 Extraction Canopy 200.0







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Unit Tag

[-]

Description

[-]

Type

[-]

Air Flow

[l/s]





































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Unit Tag

[-]

Description

[-]

Type

[-]

Air Flow

[l/s]





































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Unit Tag

[-]

Description

[-]

Type

[-]

Air Flow

[l/s]





































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Unit Tag

[-]

Description

[-]

Type

[-]

Air Flow

[l/s]





































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Unit Tag

[-]

Description

[-]

Type

[-]

Air Flow

[l/s]







2.6 DRAWING REGISTER

Drawing register

Preliminary design drawing register

Drawing number Description Size

Layouts

10120-M-1001-r0 Service tunnel and pipelines to buildings A1

10120-M-1002-r0 Plant room A1

10120-M-1041-r0 Level 4 – All inclusive A1



Schematics

10120-M-9001-r0 Plant room – chilled water A1

10120-M-9002-r0 Plant room – hot water A1

10120-M-9003-r0 Service tunnel – pipelines to buildings A1

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3 ELECTRICAL WORK

3.1 GENERAL

All material and equipment supplied for this contract shall be new and the best of their respective kind.

All new materials and equipment supplied, shall comply fully with the requirements laid down in the

specification. The whole of the works shall be executed in accordance with best practice and to

approval of the engineer. The equipment shall comply with the latest issues of the following standard

specifications:

a. SABS 150: Insulated wire

b. SANS 1091: Colour standards for paint

c. SANS 0142: Wiring code of practice

Apart from any other authority, which the engineer may have in terms of the contract, he shall have the

right to set the standard and to accept or reject part of the specified equipment depending on the quality

of material and workmanship offered.

The contractor shall be notified if the quality of such materials and/or workmanship is not acceptable. In

such an event, the contractor shall replace the specific part or repair it to the satisfaction of the

engineer, all at the cost of the contractor. Such an instruction shall not exempt the contractor from any

of his obligations in terms of the contract.

In addition the contractor shall at his cost issue all notices in respect of the installation to the local

authorities, and shall exempt the client from all losses, costs or expenditures which may arise as a

result of the contractor's failure to comply with the requirements of the regulations enumerated above.

It shall be assumed that the contractor is conversant with the above-mentioned requirements. Should

any requirements, by law or regulation, which contradicts the requirements of this document, apply or

become applicable during erection of the installation, the contractor shall immediately inform the

engineer of such a contradiction. Under no circumstances shall the contractor carry out variations to the

installation in terms of such contradictions without obtaining the written permission to do so from the

engineer.

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3.2 LV INSTALLATION

3.2.1 CABLES

This section of the technical specification covers the installation of cables for the distribution of power in

buildings, other structures and in ground for system voltages up to 1 kV, 50 Hz.

All unarmored cables shall be installed in metal trunking, sleeves or conduit unless clearly specified to

the contrary. It is a definite requirement that the Contractor shall only employ personnel fully conversant

with cable manufacturer's recommendations for joining and terminating cables.

Joints in cable runs will not be allowed unless authorised by the Engineer. Jointing shall be carried out

strictly in accordance with the manufacturer's instructions and by personnel competent in jointing the

types of cables used. The joint shall not impair the anti-electrolysis characteristics of the cable. Joints

shall be fully water and air tight and shall be free of voids and air pockets.

Cable ends shall be terminated with glands or in cable boxes with the associated accessories such as

clamps, shrouds, etc. complying in all respects with the appropriate SANS Specifications. Connection of

cables to switchgear shall always be effected in such a way that the various phases, seen from the front

of the switchgear will be in the following positions:

No. 1 conductor : left (red) (A)

No. 2 conductor : centre (white) (B)

No. 3 conductor : right (blue) (C)

A channel or other approved means of support shall be provided to remove mechanical stress from the

glands. Cable cores shall be marked with heat-shrunk sleeves where necessary to identify the phases.

Refer to SANS 10142. The current-carrying capacity and breakdown voltage of the cable end shall be

the same as for the complete cable. Cables shall be terminated in accordance with the

recommendations laid down by the manufacturers of the cables and glands employed.

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3.2.2 TESTING AND COMMISSIONING

Each cable shall be tested after installation in accordance SANS 1507 (up to 1 kV) as well as the

requirements of the Local and Supply Authorities.

The Contractor shall make all arrangements, pay all fees and provide all equipment for these tests. The

cost of testing shall have been included in the tender price. The Contractor shall notify the Engineer

timeously so that a representative may witness the tests. On completion of the tests on any cable, the

Contractor shall without delay, submit three copies of the certified Test Reports to the Engineer.

The Engineer reserves the right to inspect the installation at any stage during the course of

construction. Such inspections will however not deem the portions inspected as being complete or

accepted and the Contractor shall remain responsible for completing the installation fully in accordance

with the Contract Documents

The Contractor shall carry out a final "as built" survey of the cable routes and present to the Engineer

"as built" route plans of the complete installation. The following information shall be reflected on the

plans or submitted as separate schedules with the plans:

Overall length of the cable

Locations of all joints

Identification of each cable

Location of concrete cable markers

The works will be deemed to be incomplete until all tests have been conducted successfully and all "as

built" drawings and schedules have been handed to the Engineer.

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3.3 DISTRIBUTION BOARDS

3.3.1 GENERAL

This section of the technical specification covers the manufacturing and testing of flush mounted,

surface mounted and floor standing distribution boards for general installations in normal environmental

conditions and for system voltages up to 1 kV.

All distribution boards shall be of ample size to accommodate the specified switchgear and provide

space for future switchgear. The switchgear shall be logically arranged and grouped. Depending upon

the number and size of components, a common front panel may be installed over one or more groups

of equipment. The contractor is responsible to balance the load as equally as possible across

multiphase supplies.

All distribution boards shall be rendered moisture proof and vermin proof and shall be adequately

ventilated. All specified external dimensions for distribution boards shall be strictly adhered to. The

Contractor shall obtain the approval of the Engineer before manufacturing the distribution boards.

Front panels shall have machine punched slots for housing the specified and future flush mounted

switchgear. The distance between the inside of the closed doors and the panel shall not be less than

20mm. No equipment may be mounted on the panel unless the panel is permanently hinged to the

switchboard frame.

The front panel shall be secured to the architrave frame by means of 6mm studs and chromium-plated

hexagonal domed nuts, hank nuts or captive fasteners. Alternatively the panel may be secured to the

architrave frame by means of two pins at the bottom and a latch or lock at the top of the panel.

Distribution board doors shall be equipped with handles and catches. Locks shall only be provided

when specified. In all cases where lockable doors are required and in all cases where the distribution

board doors are higher or wider than 450mm, handles consisting of a push-button-and-handle

combination with spring loaded catch or rotary handle-and-catch combination shall be installed.

Distribution board doors smaller than 450mm in height and width may be equipped with spring loaded

flush mounted ring type latches.

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3.3.2 FLUSH MOUNTED DISTRIBUTION BOARDS

Flush mounted distribution boards shall comply fully with SANS 1765. Where distribution boards are to

be built into thick walls, expanded metal shall be spot-welded to the rear of the bonding trays. The

expanded metal shall protrude at least 75mm on each tray side to prevent plaster from cracking.

Knock-outs shall be provided in the top and bottom ends of each distribution boards tray to allow for the

installation of conduits for the specified and future circuits. Knock-outs shall be provided for an equal

number of 20mm and 25mm dia. conduits.

3.3.3 SURFACE MOUNTED DISTRIBUTION BOARDS

Surface mounted distribution boards shall comply with SANS 1765. Surface mounted distribution

boards shall be equipped with a 1,6mm minimum sheet steel reinforced tray suitably braced and

stiffened to carry the chassis, door and equipment. Lugs to secure the distribution boards to a vertical

surface shall be provided.

All joints shall be welded or securely bolted. The tray shall be square and neatly finished without

protrusions. The front tray sides shall be rounded with an edge of at least 20mm to accommodate flush

doors. A sheet steel chassis for the mounting of equipment shall be bolted to the tray and shall comply

with the requirements for distribution boards, as specified in this technical specification document.

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3.3.4 FREE STANDING DISTRIBUTION BOARDS

A metal framework for free standing distribution boards shall be manufactured from angle iron, channel

iron or 2mm minimum folded metal. A solid U-channel base frame, sufficiently braced to support all

equipment and span floor trenches and access holes shall be provided. Switchboards shall be of

cubicle design with 2mm side panels forming divisions between cubicles. Joints shall be non-

continuously butt-welded. Welds shall be ground smooth and the joint wiped with plumber's metal in

order to provide a smooth finish. Distribution boards wider than 2m shall be fitted with screwed eye-

bolts attached to the framework to facilitate loading and transportation of the board.

The rear panels shall be removable and shall be manufactured from 2mm minimum sheet steel. The

panels shall have returned edges which are recessed in the frame or which fit over lips on the

distribution board frame. The panels shall be secured to the frame by means of studs and chromium-

plated hexagonal domed brass nuts or hank nuts or captive fasteners equal or similar to "DZUS" or

"CAMLOC". Where distribution boards are intended for installation in vertical building ducts or against

walls, the rear and side panels may consist of a single folded sheet which is either bolted or welded to

the frame or which forms part of the folded metal frame.

3.3.5 STANDBY SUPPLIES

Where standby power from a diesel-generator set or other sources is available and has to be

connected to some of the equipment on a distribution board, the distribution board shall be divided into

separate sections with sheet metal divisions to isolate standby power and mains power sections.

Standby and normal supply shall each have its own incoming isolator or circuit-breaker. The two

sections of the switchboard shall be labeled "ESSENTIAL" and "NON-ESSENTIAL" respectively.

The front panels of standby and no-break supply sections shall be painted in distinctive colors as

follows, adhering to the specifications of SANS 1091:

- Normal supply: "LIGHT ORANGE"

- Standby power: "SIGNAL RED”

- No-break supply: "DARK VIOLET”

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3.4 WIRING

This section covers wiring in approved wire-ways for electrical installations in buildings or other

structures under normal environmental conditions for 50 Hz systems not exceeding 600 V.

PVC-insulated or equivalent, stranded copper conductors and bare stranded or green PVC-insulated

copper earth conductors complying with the quality specification for "PVC-INSULATED CABLES", shall

be used exclusively. Only where cables are specified or in instances where the exceptions stipulated in

SANS 10142 are applicable, may the Contractor deviate from this requirement.

All unarmored conductors shall be installed in conduits, cable channels (trunking) or power skirting and

shall under no circumstances be exposed. Cable channels and power skirting shall be of metal

construction unless specifically approved to the contrary.

Wiring shall only be carried out after the wire-way installation has been completed, but before painting

has commenced. Debris and moisture shall be removed from the wireways prior to the installation of

the conductors.

Conductors that are connected to different switchboards, shall not be installed in the same wireway.

The wiring of one circuit only will be allowed in a 20 mm dia. conduit with the exception of the wiring

from switchboards to fabricated sheet metal boxes close to switchboards in which case more than one

circuit will be allowed. For larger conduit sizes the requirements of SANS 10142, shall be met.

A loop-in wiring system where conductors are looped from outlet to outlet, shall be employed. Joints in

conductors shall be avoided as far as possible but where it becomes unavoidable, joints will be

accepted in cable channels only and not in conduits. Joints shall be soldered or shall alternatively

consist of approved ferruling, properly covered with heat-shrink sleeves. The use of PVC insulation tape

is not acceptable.

In cases where the conductors of more than one circuit are installed in the same wireway, the

conductors of each separate circuit (including earth conductor) shall be taped at intervals of 1m with

PVC insulation tape. The conductors of different circuits shall however remain separate in order that

any given circuit can be withdrawn. Conductors entering switchboards or control boards shall be

grouped and bound by means of plastic or metal bands (not tape).

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When conductors are drawn through conduit, care shall be taken that they are not kinked or twisted.

Care shall also be taken that the conductors do not come into contact with materials or surfaces that

may damage or otherwise adversely affect the durability of the conductor.

The insulation of conductors shall only be removed over the portion of the conductors that enter the

terminals of switches, socket outlets or other equipment. When more than one conductor enters a

terminal, the strands shall be securely twisted together. Under no circumstances shall strands be cut

off.

When earth continuity conductors are looped between terminals of equipment, the looped conductor

ends shall be twisted together and then soldered or ferruled to ensure that earth continuity is

maintained when the conductors are removed from a terminal.

The installation shall be earthed to comply with SANS 10142.

The installation shall be bonded to comply with SANS 10142.

The colors of conductor insulation shall comply with SANS 10142. The colors of conductors for sub-

circuits shall as far as possible correspond with the color of the supply phase. The colors of conductors

for wiring to two-way and intermediate switches shall preferably differ from the color of phase

conductors.

Electrical feed shall be sup[plied from the outdoor unit to each respective indoor unit. Cables shall

follow the layout of refrigerant lines as set out in the drawings.

Where conductor sizes are not specified, the following minimum conductor sizes shall be used:

Lighting circuits: 1,5mm² and 2.5mm² copper earth conductor

Socket-outlet circuits: 2,5mm² and 2,5mm² copper earth conductor.

Bell circuits: 1,5mm²

Clock circuits: 1,5mm²

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3.5 CABLE SUPPORT SYSTEM

The Contractor shall supply and install all hangers, supports or fixings for the channels. Channels up to

and including 150 mm shall be supported at maximum intervals of 600 mm and larger channels at

maximum intervals of 1 m. Channel runs shall be carefully planned to avoid clashes with other services

and to ensure that all covers can be removed after completion of the entire installation. Purpose made

clamps, hangers, etc. shall be used as required. Where it is not possible to support the channels at the

specified intervals, they shall be supported in a sound manner to the satisfaction of the Engineer.

Where channels are cast into concrete, the insert type shall be used. Additional spacer blocks shall be

used where necessary to prevent ducts from being deformed while the concrete is cast. Channels shall

be filled with polystyrene or other suitable fillers to prevent the ingress of concrete and shall be securely

fixed in position to the shuttering.

All channels up to and including 127mm width shall have snap-in cover plate. Cover plates for wider

channels shall be fixed by means of screws at suitable intervals to prevent warping. Cover plates shall

be installed over the full length of the channels. Flush mounted wiring channels shall be fitted with

overlapping metal cover plates with plastic edge trim to cover irregularities in the wall recess.

Adjoining lengths shall be aligned and securely joined by means of fishplates fixed by mushroom bolts,

washers and nuts or connection pieces that are pop-riveted to both adjoining sections. All adjoining

sections shall be rectangular and shall butt tightly. Covers shall fit tightly across the joints.

Where channels cross expansion joints in the structure, suitable expansion joints shall be provided in

the channels by means of fishplates pop-riveted or screwed to the channel on one side of the

expansion joint and floating freely in the channel on the other side of the expansion joint.

Where vertical duct lengths exceed 5m, conductors installed in the channels shall be secured at

intervals not exceeding 5m to support the weight of the conductors. Clamps shall be provided in

suitable draw-boxes for this purpose.

Conduit connections shall be terminated by means of two locknuts and a brass female bush. Where the

channel is wide enough, conduit connections may be made by means of a conduit box and hole

through the back or side of the channel. All holes through which conductors pass shall be fitted with

bushes or grommets or shall be sleeved.

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Bends and T-joints shall be constructed to ensure compliance with the allowable bending radii specified

in SANS 10142, Appendix D in the case of PVC-insulated cables and conductors and shall comply with

the relevant specification in the case of other cables. Burrs and sharp edges shall be removed and the

inside edges of the joints shall be lined with rubber cement or other suitable rubberized or plastic

compound to prevent laceration of the conductor insulation.

All cable channels shall be vermin proofed after installation. Holes shall be covered by means of

screwed metal plugs or by means of metal strips, which are bolted, or pop-riveted to the channel.

Wooden or other plugs which are driven into holes or other temporary plugs or covers are not

acceptable.

Multiple duct runs or internal metal partitions shall be used where conductors for power, control,

communication and other services are present.

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3.6 EARTHING AND LIGHTNING PROTECTION

3.6.1 LIGHTNING PROTECTION

The purpose of installing lightning protection in a building is to protect the people, the building, and

equipment of the building.

The lightning protection system for the rooftops shall comprise of solid aluminum conductor with a

16mm diameter and air terminal finials with multiple point of height 1600mm. Down conductors (dc)

and wall horizontal conductors, HCAC tape, c25x3mm, shall be used along exposed surfaces behind

concrete sunshades.

Connections to air terminations and to any exposed metal parts on roof or to any metallic installations

on the roof shall be effected by HCAC tape 20x2.5mm. This conductor shall also be used for side

bonding where necessary.

All accessories in the lightning protection system shall be of copper or brass. For PVC covered HCAC

tape, either PVC covered copper or non-metallic accessories shall be used. The inspection earth pits

shall be made of concrete materials

3.6.2 MAINS EARHING

A 70mm² bare copper earth wire shall be installed with all MV cables, and a bare copper earth wire with

all low voltage cables. All low voltage cabling earth wires shall be at least ½ the size of the cable size.

All earth conductors shall be appropriately bolted via a lug to the earth bar in the minibus low voltage

compartment and to the earth bar of the distribution board.

The metalwork of all distribution equipment such as switchgear and miniature substations shall be

effectively bonded to the earthing terminal of the equipment, and to the earth bars indicated in the

generator room and mini sub-room.

Earth bars shall be mounted in the miniature substation room and generator / main low-voltage room,

as indicated on the drawings. All equipment shall be earthed onto the earth bars via a 70mm² insulated

earth wire.

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A trench-earth shall be installed outside the miniature substation room. Three earth rods shall be

installed, 2 meters apart, 2400mm long. They shall be inter-connected with a 70mm² bare copper earth

wire, and connected to the main earth bar in the miniature substation room.

The earth wires routed with the medium voltage cabling shall also be terminated onto the earth bar.

Installations shall be effectively earthed in accordance with the "Standard Regulations" and to the

requirements of the supply authority, as well as the Departments Representative, who may require

additional earthing to meet test standards. Earthing must comply with SANS. 10142 – Part I, 2001.

All hot and cold water as well as waste pipes must be effectively bonded by 12,5 x 1,6 mm solid or

perforated copper tape (not wire) clamped by means of brass bolts and nuts. The tape is to be fixed to

walls by means of roundhead brass screws at intervals not exceeding 150 mm.

The earth connection from the main earth bar in the main board must be made to the cold water main

and the incoming service earth conductor by means of 16 mm2 stranded (not solid) bare copper earth

wire or such conductor as the Department's Representative may direct. Where applicable all steel roof

sheeting as well as steel walkways and stairs shall be suitably earthed.

Furthermore an earth electrode (earth spike) of at least 1,5 m long must be provided and driven into the

ground at the centre of each gable-end wall of each individual block. These earth electrodes shall be

installed at least 1 m from the building's perimeter and shall clear all aprons and water channels. These

earth spikes must be driven into the ground to at least 300 mm below ground level and only after final

bonding and tests have been carried out must proper backfilling and compacting of same be executed.

In each instance these earth spikes must be interconnected by means of a 16 mm2 stranded bare

copper earth conductor which must be installed in the inside of the ridging of the roof structure and

encased in 20 mm flush conduits installed in the gable walls. This earth conductor must be bonded to

the roof sheeting at intervals not exceeding 5 m, ensuring that roof sheeting on both sides of the ridging

are properly bonded, as specified in Clause 14 of Part 1.

The overall earth resistance at the main distribution board shall not exceed 1 Ohm. The contractor shall

assess the soil and site conditions at the time of tendering and allow for this to enable him to perform

the proper earthing and bonding of all installations.

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3.6.3 CLEAN EARTHING

A separate earth mat and earth wires will be provided for sensitive electronic equipment. This will

include the equipment in the server room; security control room and IP switch rooms.

3.6.4 SURGE SUPPRESSION

Suitable rated Surge diverters will be installed in the MV room and each of the main and sub distribution

boards.

3.7 COMMISSIONING AND COMPLETION

3.7.1 GENERAL

The Contractor shall note that he will be held fully responsible for the electrical works and for the correct

and satisfactory testing and commissioning of the complete electrical installation. Tests shall be made

on each item of major equipment at the manufacturer's works. The contractor shall give reasonable

notice in writing to enable the Engineer to inspect and witness tests of materials and equipment. He

shall provide the Engineer with facilities for witnessing these tests and for any additional tests that the

Engineer may require. The Contractor shall, at his own cost, render all assistance and supply all labour

appliances and any other materials, as the Engineer may require to check the setting, measure and

inspect any portion of the works at any stage during manufacture or construction. During such

operations the Contractor shall if required, suspend any or all the Works without having any claim for

loss of damage as a result thereof. The repetition of any test shall be deducted from the contract price.

Commissioning shall not commence until all work on that part of the system has been completed. First,

the electrical equipment and circuitry shall be checked and tested in each distribution board and shall

be rendered "safe" and fully operational before any other part of the installation is commissioned. The

settings of all protective, instrument and timing devices are to be correct, based on the manufacturer's

characteristic curves. The operation of all equipment and motors shall be tested in the "manual"

sequence first, prior to attempting "automatic" sequence control. Commissioning shall follow the

electrical testing procedures, prior to start-up of the plant. The start-up of each system or plant shall be

done in the presence of the authorised representatives of the pump contractor suppliers, the electrical

suppliers of any MV boards, the Contractor and the Engineer.

The Contractor shall check and satisfy himself that all items of installation and equipment are correctly

wired and connected before start-up. This work is to be carried out by skilled commissioning engineers

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who are completely familiar with the equipment and the operation of the installation involved. On

completion of the commissioning the Contractor shall provide written confirmation to the Engineer that

he has completed all commissioning work and is satisfied that the items of equipment and plant are

operating satisfactorily.

The Contractor shall ensure that all materials used are subjected to and shall satisfactorily withstand

the sample tests detailed in the relevant SANS and BS Specifications for the individual materials and

the completed cable. The records of such tests shall be available to the Engineer for inspection. The

Engineer also reserves the right to visit the factory at any stage and demand that any or all the sample

tests detailed in the relevant SANS specification be carried out.

3.7.2 DRAWINGS

As soon as possible after the awarding of the contract, the successful tenderer shall at his expense

submit to the Engineer for approval the following:

I. All general arrangement drawings.

II. Detailed dimensioned drawings of all equipment.

III. Complete wiring diagrams and block schematic diagrams.

At the same time a list of all equipment designations, labels, etc. in both official languages shall be

submitted for approval.

The approval of drawings shall not relieve the successful tenderer of his liability to carry out work in

accordance with the terms of the contract.

As each portion of the work is completed, the Contractor shall provide the Engineer with “as-built”

drawings showing the exact location measured from fixed points of all cables, transmission lines, each

outlet point, etc.

In addition a complete reticulation diagram showing all supply cables and switchboards shall be

provided behind a plastic cover in the Main Switchboard if not located in a substation.

On completion of the contract, a complete set of transparencies of all drawings of a quality acceptable

to the Engineer shall be handed to the Engineer at the expense of the successful tenderer. These final

drawings shall include:

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I. A proper and accurate as-made wiring diagram of the complete installation showing circuit

numbers, terminal strip numbers and conductor colors.

II. A schematic diagram clearly showing functions and component values. A material list showing

make, model and characteristics of all components of the control equipment and switchgear is to

be included.

III. Fully dimensioned as-made physical layout drawing of the equipment, batteries and ventilation

equipment.

IV. A detailed schedule of all wiring.

The contract shall be deemed incomplete until all drawings have been received by the client.

3.7.3 COMPLETION

On completion of the Contractor's Initial Testing and Plant Commissioning as specified above, the plant

shall be put into normal operation and the final adjustments of the plant shall be made. On completion

of all inspections, tests and commissioning of the Works the Contractor shall issue the Engineer with a

certificate of compliance by an accredited person.

After completion of the installation, and when the plant is in running order, the successful tenderer will

be required to instruct an attendant in the operation of the plant, until he is fully conversant with the

equipment and handling thereof.

Three (3) copies of maintenance, fault-localising and operating manuals together with the drawings

required shall be handed over to the engineer.

The installation will not be regarded as complete until all of the above requirements listed in this

specification document have been met.

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4 COMMISSIONING

Commissioning of the works shall form part of the contract. Commissioning shall be meticulous and all

procedures as stipulated by the suppliers of the equipment shall be strictly adhered to.

The Contractor shall prepare detailed commissioning schedules well in advance of the programmed

practical completion inspection date.

The schedules shall make allowance for all measurements that will be required, checking of operational

and safety set-points, test results, etc., and shall be submitted to the Engineer for approval prior to the

start of commissioning.

The Contractor shall submit the completed schedules to the Engineer for checking after commissioning

has been completed, and prior to the practical completion inspection.

The Contractor is forewarned that the Engineer will under absolutely no circumstances deviate from the

above procedure. The Engineer furthermore reserves the right to refuse to carry out the practical

completion inspection until the Contractor has complied with the above stipulations.

Each task in these schedules shall be countersigned by the Contractors Commissioning Engineer to

ensure that any discrepancies between site and commissioning conditions/data can be clarified.

The minimum commissioning requirements are:

4.1 INITIAL VISUAL CHECK

Correct models, types, etc. provided.

Equipment located in correct positions and parallel to building lines unless otherwise

specified.

Shipping fasteners, clamps, etc. removed or released.

Joints tight and correctly fitted.

All fasteners in position and tight.

Coil piping correct configuration. (Counter flow, IN at the bottom, OUT at the top, etc.).

Existence of sufficient and where applicable correctly fitted bleed off, vent valves, drains,

etc., as specified. (Both at components and in pipework.)

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Thermal expansion and contraction allowances.

Access panels provided and are hinged complete with handles, patches, locks, etc..

Natural free movement of rotary/moving equipment.

Proper isolation of rotary/moving equipment (check canvas collars anti vibration mounts,

flexible couplings/rubber mounts, etc.).

Soundness and alignment of general supports.

Grommets provided against chaffing at all pipe cables, etc. penetrations through housings,

etc.

Installation workmanship and finish.

4.2 PRE-SWITCH ON CHECKS

Merger all electrical circuits for correct continuity, etc.

Check oil levels and lubricate where applicable.

Run fan impellers by hand to see that they are free of obstructions.

4.3 POST FIRST SWITCH ON CHECKS

Listen for unusual noises from equipment items.

Check for unbalanced rotary items.

Vibration transmitted to fixed elements, such as ducts, structure, pipework, etc. (Anti-

vibration mountings, flexible canvas collars, to be checked for isolation.)

Moving/rotary equipment smooth operation, i.e. free of excessive vibration, drumming,

rumbling, etc.

Excessive air and other fluid leaks (prime suspects: Evaporator units joints and canvas

collars).

4.4 AIR FILTERS

Cell media correct.

Satisfactory filter bedding.

By pass air around cells and frames.

Easy removal of filter cells.

Positive locking devices.

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4.5 COILS

Coil materials.

Cooling coil drip tray material.

Cooling coils drip tray, front and rear extensions.

Coiling coil drip tray piping integrity (fall, slope, trap, etc.).

4.6 INSULATION

Securement.

Type and thickness.

Soundness/integrity of joints.

Vapour barrier, where applicable.

Wooden rings or other approved thermal break, at supports.

4.7 AIR-HANDLING UNITS

Merger all electrical circuits.

Check air flows for possible short circuiting.

Check rotation of equipment, fans, compressor, etc.

Measure ON/OFF ambient air condition.

Check expansion valve superheat setting.

Check all safeties, such as HP, oil switch, anti-freeze stat, overloads, anti-cycle timer, etc., if

necessary blank off condenser airflow or isolate condenser fan for HP cut out test.

Check crankcase heater operation, if applicable.

Check oil level.

Check condensate drainage, including condensate pumps.

Check electrical connection soundness/tightness.

Check panels air-tightness (all fasteners in place and tight).

Check vibration isolation of refrigerant pipework from other components.

Check grommets provided at piping, cables, etc. entries into unit.

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4.8 ELECTRICS

Check motor sizes.

Check motor types.

Check amperage against motor nameplate ratings.

Motor direction of rotation.

Electrical wiring.

Starters overload settings.

Interlocks.

Check soundness of all wiring connections (particularly ammeters.).

4.9 GENERAL

Lubrication.

General noises.

Colour coding provision.

Space cleanliness.

Spare parts/operating manuals handed over.

4.10 AIR SYSTEMS

Measure and record air flow at air registers.

Measure fans static pressure rise and motor draw (amperage)

Measure excessive noises if any.

It is hereby recorded that the checking, testing, adjusting, measuring, setting, confirming, reporting, etc.,

of the foregoing items are the minimum requirements. Additional tasks which are necessary for the

proper commissioning of the works shall be conducted by the Contractor / Supplier as required.

4.11 AS-BUILT DRAWINGS

As-built drawings shall be prepared by the Contractor. These drawings shall be submitted to the

Engineer for approval 1 week prior to the programmed date for the practical completion inspection of

the last section of the works.

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5 MAINTENANCE

The Contractor shall prepare detailed weekly, monthly, 6-monthly and annual maintenance and service

schedules, as required, for the complete works. These schedules shall be included in the Operating &

Maintenance Manuals and will be submitted to the Engineer for approval.

The tenderers shall allow for four (4), equally spaced, service visits to be carried out during the warranty

period. A detailed service report together with a copy of the completed maintenance and service

schedules shall be passed on to the Engineer on completion of each service visit.

The Contractor shall provide a logbook, which shall be stored in an approved location on site. A short

description and any relevant comments relating to the service visits or defect repairs, and all pressures,

power draws etc., to be logged, shall be noted in the logbook at the end of each visit. Each entry shall

be signed and dated by the serviceman, as well as counter signed by the Employers representative. A

new logbook shall be provided by the Contractor when required and the old book passed on to the

Employer via the Engineer.

5.1 OPERATING AND MAINTENANCE MANUALS

Five sets of operating and maintenance manuals shall be prepared by the Contractor. These manuals

shall be submitted to the Engineer for approval 1 week prior to the programmed date for the practical

completion inspection.

Tenderers are to note that the said practical completion inspection shall not be carried out prior to the

approval of these operating and maintenance manuals.

The manuals shall be properly bound and titled. Each set shall consist of 4 sections. Each section shall

have the following sub-sections:

1. Section 1 - Operation

1.1. Introduction: Short description of the complete system to familiarise laymen with the system

lay-out and operation.

1.2. Detailed description: A detailed description of each system and its equipment, complete with

schematic drawings. The purpose of this system is to explain the intended operation of each

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system and item of equipment to technical personnel. Detailed descriptions of the operation,

set-points, adjustments, etc., are thus to be included.

2. Section 2 - Commissioning data

2.1. Schedules of data: Detailed schedules of commissioning data of all the systems shall be

included in this section for future reference. These schedules shall include, amongst others,

air flow rates, major equipment power draws, pressure drops, etc.

3. Section 3 - Maintenance

3.1. Schedules: This section shall contain detailed maintenance and service schedules for the

complete installation.

3.2. Equipment details: This section shall contain manufacturer’s brochures, spare parts lists,

etc., of all the items of equipment.

3.3. List of suppliers: The list of suppliers (complete with addresses and telephone numbers) for

each item of equipment shall be included in this section.

4. Section 4 - Drawings

4.1. As-built drawings: A complete set of as-built drawings shall be enclosed in this section.

In addition to the above, one operating and maintenance instruction booklet per air-conditioning unit

installed shall be provided by the contractor prior to the practical completion inspection. It is to be noted

that under no conditions will the practical completion inspections be carried out unless these instruction

booklets have been handed over to the Engineer. It shall be the contractor’s responsibility to advise the

air-conditioning unit’s suppliers of this requirement at tender stage and to ensure that any associated

costs are allowed for in the tendered subcontract sum.

5.2 INSTRUCTION

The Tenderers shall allow a period of 8 working hours for instructing of the Employers representatives

and the Engineer on the operation, maintenance and adjustment of the systems.