130301 spec mech issue a 13 nov 2013 so

1 130301 SPEC MECHANICAL ISSUE A 13 NOV 2013 SO

MECHANICAL SERVICES SPECIFICATION OF

work to be carried out and material to be used in the construction of

NEW OFFICE BUILDING

at

307 DURHAM STREET, CHRISTCHURCH

ISSUE A: CONSENT ISSUE

All work shall be carried out and completed in accordance with the drawings prepared by, and

instructions to be given by TM Consultants Limited, and to the entire intent of this Specification.


CONTENTS

GENERAL .......................................................................................................................... 4

1.1 INTRODUCTION ................................................................................................................... 4

1.2 SCOPE ............................................................................................................................... 4

1.3 DOCUMENTS ...................................................................................................................... 4

1.4 COMPLETION OF WORKS ...................................................................................................... 4

1.5 PLANT, EQUIPMENT AND FACILITIES, ETC ................................................................................. 5

1.6 REGULATIONS AND GOVERNING AUTHORITIES .......................................................................... 5

1.7 STANDARDS ....................................................................................................................... 5

1.8 PROPRIETARY ITEMS AND ALTERNATIVES .................................................................................. 6

1.9 ORDERING OF MATERIALS/EQUIPMENT ................................................................................... 6

1.10 TRADE COORDINATION AND COOPERATION .......................................................................... 6

1.11 BUILDERS WORK ............................................................................................................. 7

1.12 WORK BY MECHANICAL TRADE: ......................................................................................... 7

1.13 WORK BY THE MAIN CONTRACTOR: .................................................................................... 7

1.14 FIRE STOPPING ............................................................................................................... 8

1.15 NOISE AND VIBRATION LEVELS ........................................................................................... 8

1.16 PRODUCER STATEMENT .................................................................................................... 9

1.17 PAINTING AND FINISHING ................................................................................................. 9

1.18 WORKS PROTECTION, DAMAGE, CLEARANCE, MAKING GOOD ................................................. 9

1.19 INSPECTION FACILITIES AND TESTING ................................................................................... 9

1.20 EARTHQUAKE PROTECTION ............................................................................................... 9

1.21 ACCEPTANCE ................................................................................................................ 10

1.22 ADDITIONAL OBSERVATION ............................................................................................. 10

1.23 GUARANTEE ................................................................................................................. 10

1.24 COMMISSIONING .......................................................................................................... 10

1.25 GENERAL ..................................................................................................................... 10

1.26 SCOPE ......................................................................................................................... 11

1.27 COMMISSIONING METHODS ............................................................................................ 11

1.28 PERFORMANCE TEST DOCUMENTATION ............................................................................. 11

1.29 TRAINING .................................................................................................................... 12

1.30 MAINTENANCE ............................................................................................................. 12

1.31 AS BUILT DOCUMENTS ................................................................................................... 12

1.32 INSURANCES ................................................................................................................. 13

2.0 OFFICES VENTILATION SYSTEMS .............................................................................. 14

2.1 GENERAL ......................................................................................................................... 14

2.2 SCOPE ............................................................................................................................. 14

2.3 DESIGN CRITERIA AND OTHER REQUIREMENTS ........................................................................ 14

3.0 DUCTWORK ............................................................................................................ 16

3.1 RIGID DUCT ..................................................................................................................... 16

3.2 RIGID DUCT INSULATION .................................................................................................... 16

3.3 FLEXIBLE DUCT ................................................................................................................. 17

3.4 FLEXIBLE CONNECTIONS ...................................................................................................... 17

3.5 DAMPERS ........................................................................................................................ 17

3.6 GRILLES, DIFFUSERS AND LOUVERS ....................................................................................... 18

4.0 VENTILATION PLANT ............................................................................................... 19


4.1 FANS AND COWLS ............................................................................................................. 19

5.0 ELECTRICAL WORK FOR MECHANICAL SERVICES ...................................................... 20

5.1 GENERAL ......................................................................................................................... 20

5.2 SCOPE OF WORK ............................................................................................................... 20

5.3 REGULATIONS AND GOVERNING AUTHORITIES ........................................................................ 21

5.4 ELECTRICIAN’S RESPONSIBILITIES .......................................................................................... 21

5.5 FEES AND PERMITS ............................................................................................................ 21

5.6 EARTHING ........................................................................................................................ 21

5.7 CABLING AND WIRING FACILITIES ......................................................................................... 21

5.8 WIRING ACCESSORIES ........................................................................................................ 22

5.9 LABELLING AND MARKING................................................................................................... 22

5.10 CONTROL PANELS, SWITCHBOARDS AND MOTOR CONTROL CENTRES (MCC) ............................. 22

5.11 GENERAL ..................................................................................................................... 22

5.12 ENCLOSURES ................................................................................................................ 23

5.13 MOTOR STARTERS ......................................................................................................... 23

5.14 AS-BUILT DRAWINGS ..................................................................................................... 23

5.15 SPARES ....................................................................................................................... 23

6.0 AUTOMATIC CONTROLS .......................................................................................... 24

6.1 GENERAL ......................................................................................................................... 24

6.2 SCOPE ............................................................................................................................. 24

6.3 COMPONENT REQUIREMENTS .............................................................................................. 24

6.4 GENERAL REQUIREMENTS ................................................................................................... 24

6.5 AUTOMATIC CONTROLS SCHEDULE ....................................................................................... 25

6.6 FIRE MODE ....................................................................................................................... 25

7.0 PLANT AND EQUIPMENT SCHEDULES ....................................................................... 26

7.1 EQUIPMENT SCHEDULE....................................................................................................... 26


GENERAL

1.1 Introduction

This work included in this specification is for the installation of new Mechanical Services for

the New Office Building at 307 Durham Street, Christchurch.

Refer to the Main General Conditions of Contract (NZS 3910), the Specific Conditions of

Contract and the Preliminary and General Section of the Specification, all of which shall

apply to this trade.

The Mechanical Services Contractor shall be responsible to ensure that all work carried out

and any design completed by himself is safe, suitable for the purpose intended and in

accordance with the relevant codes. Acceptance of the completed works shall in no way

relieve the Mechanical Services Contractor from such responsibility.

1.2 Scope

The following work is included:

1. Fresh Air Ventilation systems.

2. Toilet Extract systems.

3. Electrical work associated with the mechanical plant.

4. Automatic controls work associated with the mechanical plant.

5. Testing, commissioning, two weeks reliability running and demonstration of all systems.

6. Producer Statement/Code Compliance Certificate.

7. Client instruction.

8. Maintenance manuals and as-built drawings.

9. 12 months maintenance and warranty.

10. Maintenance/defects liability/guarantee.

The work covered by other trades includes:

1. Builders work as defined in the Builders Work section.

2. Aspects of electrical work are by the Main Electrician as defined in the Electrical for

Mechanical section.

1.3 Documents

The Specification and Drawings define generally the systems and requirements, are

mutually explanatory and shall be read together. Drawings do not attempt to detail items

regarded as standard trade practice and are not intended for use as shop drawings. It shall

be the responsibility of the Contractor to check all dimensions and details on site and

prepare shop drawings. Where an item is not indicated on the drawings and/or included in

the specification but is obviously required to complete the particular system this contractor

shall provide the item within the accepted contract sum.

1.4 Completion of Works


The works shall be completed and fully tested to the true intent and meaning of the

Drawings and Specification taken together. Provide all components necessary for a

complete and correctly working system complying with all relevant standards, even if not

specifically mentioned herein.

Before submitting their proposals, Tenderers shall inform themselves of the nature of the

work required from this Specification and all associated Drawings.

No claims will be considered in respect of extra work resulting from inadequate knowledge

of the site or documents unless it is clearly outside the spirit and meaning of the Drawings

and Specification, and such work shall have been ordered in writing by the Engineer.

Liaise with the Main Contractor to determine a detailed programme of the work. Provide

within two weeks of being awarded the contract a detailed elemental bar chart of the

programme of work. The bar chart shall list each of the services covered by this Specification

and show on a floor by floor basis or other agreed format how the programme will be

achieved in sufficient detail to enable the Engineer to accurately gauge the progress of the

work relative to the project completion date.

1.5 Plant, Equipment and Facilities, etc

The Contractor shall ensure that all equipment, plant, facilities, services etc. of every kind

necessary for the efficient execution, completion and maintenance of the works are

provided.

1.6 Regulations and Governing Authorities

The installation and its execution shall be in strict accordance with the requirements of the

NZ Building Code, all Statutory and Local Authority Regulations, OSH guidelines, By-Laws and

all amendments thereto.

The Documents shall not be interpreted in any way to permit work that does not comply.

The Contractor shall be responsible for obtaining all approvals, consents, licences and

permits for the installation and obtaining a Certificate of Compliance in accordance with the

New Zealand Building Code, and shall pay all fees, levies and other charges in connection

with such permits, inspections and approvals by Governing Authorities.

The Mechanical Contractor shall comply with all the requirements of the Health and Safety

in Employment Act.

Prepare a specific Health and Safety Plan for this project that is fully coordinated with the

Main Contractor, and provide a copy to the Engineer on request.

1.7 Standards


All aspects of the work shall meet the requirements of the Engineer and the Contractor

shall, at his own expense, make good any part of the installation which is rejected by the

Engineer.

All materials and components shall be new, except where otherwise specified, and of the

best quality throughout, and shall comply with the current issues of all relevant NZS, CSS, AS

or BS specifications and any other documents as specified in the relevant sections of this

specification.

The installation shall be carried out by experienced, qualified, registered (where applicable)

tradesmen and shall conform to the best standards of trade practice. All sections of the

work must be carried out by personnel experienced in the particular service.

All materials and equipment shall be installed, commissioned and maintained strictly in

accordance with manufacturers’ recommendations.

1.8 Proprietary Items and Alternatives

Certain proprietary items may be specified in these Documents. Alternative materials or

components may be offered. Alternatives must be listed at the time of tender for approval.

All consequential changes and costs resulting from an alternative including changes and

costs to other trades, shall be allowed for by the Subcontractor at no increase in cost to the

Principal.

Acceptance is conditional on the following: -

1. The equipment has similar dimensions and arrangements of connections to that quoted

and will readily fit into the available space.

2. Access for installation and maintenance is not impaired.

3. The equipment shall be similar or better in quality, finish and performance to that

specified.

4. The saving in cost to be passed to the owner shall be clearly stated.

Where there is no mention of an alternative, it will be assumed that the Mechanical Services

Subcontractor will provide the exact type specified. No substitution of materials or

components shall be made without the prior written approval of the Engineer.

1.9 Ordering of Materials/Equipment

All orders shall be made in writing to the suppliers and the required deliveries arranged and

confirmed. Copies of any orders shall be forwarded to the Engineer if requested.

1.10 Trade Coordination and Cooperation

All subcontractors shall cooperate fully with the main contractor and the other trades. Refer

to the specific trade sections for specific coordination details. This contractor shall liaise with

the Main Contractor to determine a detailed programme of their work so that the Practical

Completion date will be achieved.


The Mechanical Services Contractor shall be responsible for coordinating any mechanical

systems with the following:

1. Project Manager: Delivery dates, timeline, etc.

2. All Contractors.

3. Any other affected party.

It is the Mechanical Services Contractor’s responsibility to ensure that the mechanical

installation is coordinated with all ceiling heights, sprinkler layouts, lighting layouts,

structural, architectural, etc.

1.11 Builders Work

The following clauses define the builder’s work responsibility for this project:

1.12 Work by Mechanical Trade:

1. All acoustic and fire stopping related to the mechanical trade, and responsibility for

compliance.

2. Selection of control dampers, control valves, sensors, etc.

3. Verifying required fan/pump heads, prior to ordering fans/pumps, using

ductwork/pipework layouts detailed on the Sub-Contractors’ installation drawings and

the selected plant and equipment to be installed.

4. The supply and installation, including design, of all steelwork and plinths necessary for

support of plant and services unless indicated otherwise on the Tender Drawings.

5. Provision of all equipment and protective measures necessary for welding or brazing of

refrigerant pipework.

6. The supply and installation, including design, of all access ladders, gantries and platforms

in plant rooms and risers required to facilitate safe access and maintenance of

equipment installed under this Sub-Contract.

7. Making good of any building surfaces or elements soiled or damaged by the Mechanical

Contractor.

8. Checking of dimensions on site and preparation of Builder’s Work, Installation and

Fabrication drawings.

9. Provision of all setouts, locations, details and requirements for builder’s work.

10. All core drilling.

11. Liaison and cooperation with the Main Contractor/Project Manager to ensure that

builders work is completed in accordance with the programme.

12. Design of test rigs as necessary to carry out the specified testing.

13. Sizing and selection of commissioning sets including any proportioning of main losses,

etc.

14. Design associated with temporary works not forming part of the final installation.

15. Preparation of Method Statement covering the whole of the Works inclusive of, but not

limited to, stripping out works, off and on site testing, inspection, installation, setting-to-

work, testing and commissioning.

1.13 Work by the Main Contractor:

1. Access to the roof, safety rails or screens, etc.


2. Provision of any ceiling bulkheads and framed enclosures for mechanical services as

defined on the Architectural Drawings.

3. Access panels to ensure that all plant is accessible. All positions shall be coordinated

with the Mechanical Contractor, and if the position needs to be moved, or additional

panels are required, the proposed locations shall be confirmed with the Engineer.

4. Penetrations, framing, flashing and weather sealing for all external fans, roof cowls and

louvres.

5. All plant decks and walkways.

6. Penetrations, supports, and framing for all internal grilles, diffusers, and ducts etc.

7. All other penetrations through or into the building structure. All pre-formed

penetrations in concrete work shall be located in consultation with the Mechanical

Contractor two weeks prior to element formation.

8. Acoustic and fire stopping of all penetrations through internal walls as directed by the

Mechanical Contractor.

9. Programming and coordination of the construction sequence to ensure adequate access

for the Mechanical Contractor to install plant.

10. Undercutting of doors where required.

11. Undertaking all other builders work, as related to mechanical services. Coordinate with

the Mechanical Contractor.

12. Preparation of Operating and Maintenance Instructions and As Built Drawings.

1.14 Fire Stopping

Where penetrations are required through fire rated walls, partitions, ceilings, and floors etc,

suitable fire stopping shall be carried out to ensure that the fire rating of the partition is not

compromised.

Fire stopping systems shall have a fire rating of not less than the partition in which they are

being installed and shall be tested in accordance with the NZBC.

The fire stopping method selected shall be approved as appropriate for the type and size of

the gap or penetration. The method of installation shall be in accordance with the NZBC and

identical to that used by the prototype in the tests to establish its fire rating.

Fire stopping shall be carried out by a competent installer in accordance with the

manufacturer’s recommendations.

If requested, a certificate shall be provided from the product supplier to confirm that the

products used are appropriate for the installation and comply with the NZBC. This certificate

shall also be signed by the installer to confirm that the products have been installed in

accordance with the manufacturer’s recommendations.

1.15 Noise and Vibration Levels

Noise levels from plant supplied under this contract shall not exceed the following when

measured anywhere in the space at 2 metres above floor level.

Occupied Areas: NC35

Service Areas: NC40


Outdoor Areas: Ambient levels required by the CCC City Plan.

Vibration levels shall be within the normally accepted range for equipment of the relevant

type and duty.

1.16 Producer Statement

At the time of offering the installation for practical completion, the contractor shall forward

to the engineer a written statement confirming that all work has been completed in

accordance with the contract documents.

The Contractor is to obtain a Certificate of Compliance for all work completed by him and

his associated sub-trades.

1.17 Painting and Finishing

All plant and equipment shall be constructed of corrosion resistant materials and finishes

suitable for a design life of 20 years. Any component showing signs of corrosion or failure of

the protective coatings during the maintenance period shall be repaired or replaced free of

charge. Make good any damaged works and finishes on all equipment. Colours shall be from

the BS or Resene range and shall be advised by the Architect.

1.18 Works Protection, Damage, Clearance, Making Good

Throughout the Contract, the Contractor shall store his materials and equipment in a secure

and orderly manner and shall take all reasonable steps to protect the work of this trade

from damage by others or natural elements.

He shall also make good, at his own expense, all damage caused by him to work of other

trades, and site items such as footpaths, fences, etc, and shall remove promptly from site all

trade wastes and surplus materials and maintain the site clear of all trade wastes and debris

associated with this Contract.

1.19 Inspection Facilities and Testing

Facilities shall be provided for the Engineer to examine the work of the installation as it

proceeds. The Contractor shall make good, at his own expense, any defects disclosed in the

above tests.

All certificates and data from these tests shall be forwarded to the Engineer for approval

immediately they are available.

1.20 Earthquake Protection

The equipment supplied and installed under this contract shall be fixed in place and braced

to provide protection from earthquake damage or consequential damage to any other

equipment. This work shall be carried out in accordance with NZS 4219.


1.21 Acceptance

If the installation, its operation and performance prove to be entirely satisfactory and in

accordance with these documents, the Engineer will accept the installation of this Contract

for Practical Completion. It should be noted that only one Completion Certificate will be

issued for the Contract.

The Contractor shall supply a Producer Statement confirming that all work has been

completed in accordance with the Building Code and the Contract documents.

If the installation, or any section of it, fails to qualify for acceptance, the Subcontractor

shall:-

1. Pay for the Architect or his representatives attendance at current hourly rates plus

disbursements for the visit. Such payment may be by deduction from the Final Payment

Certificate if the Architects account has not been previously settled. (Refer also to

‘Additional Observation’ clause.)

2. Rectify all faults and recommission before resubmitting the installation for acceptance

and pay all expenses involved.

1.22 Additional Observation

Where deficient performance by the Mechanical Services Subcontractor results in additional

engineering observation costs being incurred by the Principal or his advisors, the additional

costs may be recovered from the Mechanical Services Subcontractor. This will be in the form

of deductions from the retention monies.

The additional costs to be recovered will be the time expended at current hourly rates plus

associated disbursements.

1.23 Guarantee

The Contractor shall guarantee, to the Principal in writing, to repair or replace promptly,

free of charge, any materials, equipment or workmanship in which defects may have

developed within one (1) year of the date of issue of the Practical Completion Certificate.

Only expendable items as determined by the Engineer shall be exempt from this guarantee

but shall be guaranteed to the extent of the manufacturers' or suppliers' stated average life.

All manufacturers' or suppliers' guarantees extending beyond the Contract Guarantee

period, shall be registered in the name of the Principal and Certificates forwarded to the

Engineer.

1.24 Commissioning

1.25 General

Commissioning shall be carried out by a firm approved by the Engineer who are qualified and

experienced in this field of work and with the equipment concerned. This trade shall engage

and be responsible for the commissioning firm.


The commissioning firm shall satisfy themselves and any local authority inspectors that the

installation meets their requirements and shall check that the installation is complete in all

respects before presenting it for acceptance testing, including motor starter operation and

overloads.

1.26 Scope

1. On completion of the installation inspect the installation and carry out all pre-start checks.

Carry out all lubrication, flushing and cleaning. Fit all identification and labels.

2. Test, commission and set to work all plant and equipment installed under this

subcontract and prove to the satisfaction of the Engineer that the requirements of this

Specification have been met.

3. Provide all necessary instrumentation, materials and labour for commissioning.

4. Allow to carry out smoke tube test of airflows in both heating and cooling mode.

5. Allow for adjustment of diffuser blades where applicable to obtain the most suitable

intermediate setting to provide satisfactory air distribution for both heating and cooling

modes.

As part of the recommissioning process, all equipment shall be checked to be operational and a

brief summary provided of the equipment condition. This will not require a full airflow

commissioning of the systems.

1.27 Commissioning Methods

All testing, balancing and adjusting of the mechanical services installation shall be carried out in

accordance with CIBSE current commissioning codes and/or ASHRAE Guideline 1 – 1996 The

HVAC Commissioning Process.

Air distribution balancing shall be in accordance with the 1996 CIBSE Commissioning Code,

Series A - Air Distribution.

A copy of the final test results shall be handed to the Engineer.

1.28 Performance Test Documentation

The Mechanical Contractor shall:

1. Provide equipment test sheets for all items of equipment included in the mechanical

services contract. The test results shall include fan speed, pressure (provide plugged

holes for measuring this), motor running current and voltage.

2. Prepare checklists to cover all automatic controls functions, modes, inputs and outputs

sufficiently comprehensive to fully verify the correct functioning of the system across

the full range of operating conditions. Hand a completed copy of the controls checklist

to the engineer when all items have been verified and ticked.

3. Retain schematic drawings of all systems showing the initial reading measured at each

point and in branches, prior to any balancing, as well as the final reading obtained

following all adjustments. These final readings shall be reproduced on test reports and

referenced to item/room numbers on the as-built drawings.


4. On conclusion of the commissioning, prepare a fully detailed report including all final

measurements, individual, grille and diffuser airflows and percentage comparisons to

design values on the test reports. One copy of this report shall be supplied to the Engineer.

Once approved a copy of the commissioning test reports shall be included in the operating and

maintenance manual.

1.29 Training

Allow at least three hours on site training nominated staff in the day-to-day operation of the

system.

1.30 Maintenance

The installation shall be maintained for a period of twelve months from the date of issue of

the certificate of practical completion. Maintenance shall be carried out in accordance with

the equipment supplier's recommendations.

Maintenance shall include:

1. Routine inspection of the entire installation to ensure correct functioning.

2. Replacement or correction of defective components, equipment, materials,

workmanship.

3. Maintenance of all items which require periodic inspection adjustment, lubrication, etc.

4. Prompt callouts to any faults that may occur during the maintenance period. The call out

service shall be a 7 day per week 24 hour service.

5. Filling out an onsite logbook of what issues had arisen and been dealt with, etc and

advising the Principal in writing of any issues after each inspection.

6. Re-checking of the overall system on the final inspection which will include flow rates,

controls and operation to ensure the system performs as per the documents.

1.31 As Built Documents

Maintain neat and accurate records of all deviations from the Contract Drawings. Show the

Engineer a copy of the records if requested. At the completion of the contract, update the

Drawings to as-built status.

As-built drawings shall be produced on a system compatible with the AutoCAD release

current for the year of issue of this Specification. The original drawing file will be made

available in electronic format for updating to as-built.

Submit a full size draft set of the as-built drawings for the Engineer’s approval. Once written

approval has been obtained, submit the following information to the Engineer 3 bound

copies of the following:

1. 1 set of full size prints.

2. A3 set bound into the manuals.

3. Electronic drawing files in AutoCAD .dwg format.


This clause applies equally to schematics required under the Electrical for Mechanical and

Automatic Controls sections of this Specification.

1.32 Insurances

Refer to the Main General Conditions of Contract.


2.0 OFFICES VENTILATION SYSTEMS

2.1 General

Refer to the drawings.

The equipment shall be as per the drawings and where detailed in the schedules.

Equipment shall be designed, constructed and installed with provision for easy access for

operation, maintenance and servicing.

Only approved firms and tradespeople shall carry out the refrigeration work for the air

conditioning installation.

2.2 Scope

With reference to this specification and the drawings, the following systems are to be supplied,

installed and commissioned:

1. Fresh air ventilation systems.

2. Toilet Extract system.

2.3 Design Criteria and Other Requirements

All plant shall be compliant with the latest Minimum Energy Performance Standards (MEPS).

All mechanical systems shall be adequately supported both for normal service and earthquake

loads. All supports, restraints and fixings shall comply with NZS4219.

Filters shall be easily accessible and removable for regular cleaning. Coordinate access panel

requirements with the architect. Hinged panels with quick release locks are acceptable, screw

panels are not. Allow to provide three complete filter sets (1 being used, 2 spare).

Office Area: mechanical fresh air supply systems shall incorporate supply fan units complete

with air filters for Ground, 1st

and 2nd

floor systems. Electric duct heats shall preheat the supply

air to minimum 16 oC prior to discharging from the ceiling mounted grille.

Toilet area shall be mechanically ventilated by one dedicated extract system for ground, 1st

and 2nd

floors.

2.3.1 The design conditions are as follows:

Air Conditions

Summer Outdoor: 28oC DB

19oC WB

Winter Outdoor: -2oC

Indoor: Summer Winter Maximum temperature


variation between ON/OFF

Office/Retail 23oC 20

oC + 1.5k

2.3.2 Ventilation Rates

Office – 1 occupancy per 10sqm and 10 L/s per person.

2.3.3 Infiltration Rates

0.25 air changes/hour

2.3.4 Mechanical Services Plant Noise Levels

Occupied spaces: NC35

Services: NC40

2.3.5 Filtration

Occupied spaces: EU3


3.0 DUCTWORK

3.1 Rigid Duct

Ductwork shall comply with SMACNA HVAC Duct Construction Standards: Metal & Flexible

2005, 3rd Edition.

Isolate all ductwork from the building structure with a minimum of 3mm felt.

Make allowances for thermal insulation and attenuating lining when determining metal duct

sizes and space requirements. All joints shall be airtight to the Engineer’s satisfaction.

Design and fabricate all ductwork to maintain a smooth and quiet air flow within the space

limitation imposed.

Ductwork shall be constructed:

1. From flat clean galvanised steel sheet complying with AS1397:2001 Grade GC Z200.

2. From non combustible materials.

3. On machine equipment suitable for the sizes and gauges of materials used, within

tolerance of ± 6mm.

4. With properly made joins free from rough edges, corners and surfaces.

5. Smooth and free from projections on internal surfaces.

6. Coated with zinc rich paint on all cut edges, all lock seams, and any place where the

galvanising is broken.

Leave the inside of all ductwork in a clean condition on completion of the Contract.

External ductwork joints shall be flanged construction sealed against moisture and capped.

Interior ductwork exposed in occupied areas shall be solvent cleaned and painted with one

coat of modified vinyl etch primer (15 microns minimum thickness) and two coats of modified

alkyd gloss enamel. Total dry film thickness shall be 615 microns minimum.

All external ductwork shall be abrasive blasted and solvent cleaned. It shall be painted with an

organic zinc exterior primer to 70-85 microns minimum dry film thickness and 2 coats of a high

build epoxy top coat compatible with the primer and suitable for onsite touching up. The top

coats shall each be of minimum thickness 100-125 microns. The total dry film thickness shall be

a minimum of 270-330 microns. Flanges shall be overflashed with folded galvanised flashing.

3.2 Rigid Duct Insulation

Insulate all ducting as per the Drawings. The insulation shall also be applied to associated

ancillaries such as spigots, dampers, etc.

Internal insulation shall be 25mm thick Novahush Duct Liner faced on the air stream side with a

thermally bonded fire resistant polyester black facing.


All sections of the insulation are to be neatly butted into place and held by gluing and pin

buttoning at 400mm centres commencing 100mm from edges. Exposed pins shall be clipped

off after the installation is complete.

Sheet edges shall be tightly butted and the leading edges protected by T, U, or Z bars. Joints

shall be taped over with an approved sealing tape.

External insulation shall be 25mm thick AHI Fibreglass Ductwrap with a vapour barrier. The

insulation shall be applied to all ducting where indicated on the drawings including all spigots,

rigid round ducts, which form part of the air conditioning and dampers etc. The insulation shall

be installed in accordance with the manufacturer’s recommendations. Ensure that the vapour

barrier is not punctured.

3.3 Flexible Duct

Connection to the ceiling diffusers and grilles shall be made using 25mm polyester insulated

flexible ducting, covered with a vapour barrier; use insulated Spiroflex from Holyoake. No

alternatives allowed here.

Flexible ductwork shall be installed without being deformed. A prefabricated bend junction or

connecting box shall be used where a sharp radius is required. Connection of flexible ducts to

rigid ductwork shall be made using approved spigots, clamping bands, or other approved

coupling pieces and finished with two layers of duct tape. All spigots shall be complete with a

butterfly damper.

3.4 Flexible Connections

Flexible connections shall be used between fans and ducted air conditioning units and adjacent

ducts. The connections shall be made using a flexible heavy weight fire resistant coated canvas

material riveted to angle flanges using 1.6mm bands. The effective length of the joints shall be

100mm. Flexible connections shall not be used to take up misalignment of the air conditioner

or fan connection with the adjoining duct.

3.5 Dampers

Dampers shall not rattle.

Fire dampers shall be installed at all floor, ceiling or structural fire rated wall penetrations.

Where fire dampers installed in a floor butt up against a wall a steel angle these shall be

installed to support the sleeve on the wall side. Fire dampers shall be drop tested after

installation

Fire dampers for circular ductwork shall be Halton PW series of at least the same fire rating as

the element penetrated. Fire dampers for square ductwork shall be Holyoake IBD-B-V or IBD-B-

H and shall be installed to completely comply in every respect with the Holyoake Installation

directions, if required. Intumescent fire dampers shall be from FirePro, model FG40, and

completely comply in every respect with the manufacturer instructions. A joining T bar will be

required for pieces larger than 600mm in width.


Access panels to be provided for all dampers. All fire dampers installed at fire rated

floor/ceiling or wall shall have two access panels, i.e. one on each side of the slab or wall

respectively.

3.6 Grilles, Diffusers and Louvers

Allow for baked enamel finish or powder coating of all diffusers, grilles and cowls to a non

standard colour to be specified by the Architect. Confirm the colours with the Architect prior to

placement of the order.

All diffusers and grilles are specially designed and shall have duct connection boots as supplied

and recommended by the diffuser manufacturer.

The number of grilles shall be confirmed by the Mechanical Contractor at time of tender.


4.0 VENTILATION PLANT

4.1 Fans and Cowls

All fans shall:

1. Be rated at 200oC and 100 kPa absolute.

2. Be capable of the specified performance when tested in accordance with NZS 451 (BS 848).

3. Be supplied complete with motor(s), fixing brackets and anti-vibration mounts with an

efficiency of at least 90%.

4. Be statically and dynamically balanced and shall be free from vibration in excess of 0.05mm

maximum peak to peak.

5. Produce no objectionable pure tones within the occupied areas and be free from

resonance.

6. Where mounted externally, be painted or coated in accordance with the manufacturer’s

recommendations or painted with an organic zinc exterior primer to 70-85 microns

minimum dry film thickness and 2 coats of a high build epoxy top coat compatible with the

primer and suitable for onsite touching up. The top coats shall each be of minimum

thickness 100-125 microns. The total dry film thickness shall be a minimum of 270-330

microns. Whichever is deemed to give the longest corrosion-free life.

Steel impellers and casings shall be galvanised or painted after thorough cleaning, with at least

one corrosion inhibiting priming coat as approved by the Engineer. All nuts, bolts, and other

fixings shall be galvanised or otherwise corrosion protected.

Cowls shall be low profile UV stabilized fibreglass or plastic, galvanized mild steel, or other

specialised material where specified or required for the duty or operating environment. All

fixings shall be corrosion proofed. Fit all cowls with bird mesh.


5.0 ELECTRICAL WORK FOR MECHANICAL SERVICES

5.1 General

The Mechanical Electrician shall be a subcontractor to the Mechanical Contractor.

The Mechanical Electrician shall refer to the General and Special Conditions of Contract and

to the Preliminary and General Clauses of the Specification. These shall apply equally to this

section and shall be read in conjunction with it.

5.2 Scope of Work

Supply, install and commission the electrical for mechanical installation complete with

controls, subcircuits, and accessories of the type and performance required to provide a

finished and correctly working installation.

The scope of work generally comprises:

1. Power supply to new plant and equipment will be by electrical contractor. All

switchboards are to be installed by the electrical contractor. The mechanical

contractor shall include the provision of all controls.

2. A suitably sized cable from the main switch board (MSB) shall be run by others.

Termination to the MDB and carryout all sub-circuit field wiring by others, noting the

following:

a. Allow for half the available current drop as a maximum.

b. Terminate cables at the breakers on the MSB.

c. Precise locations to be determined on site by the architect.

3. Mount and field connect all electrical controls supplied as part of this contract. The

Mechanical Electrician shall carefully read the complete Automatic Controls section

and controls supplier’s drawings, and make full allowance for all work as defined and

required.

4. Coordinate with the Main Electrician. Within two weeks of the awarding of the

contract, communicate loadings. An absence of coordination will not remove the

responsibility of the Mechanical Electrician to deliver the requirements of this

Specification.

5. Coordinate with the Hydraulic Services Subcontractor.

6. Allow for all systems and gear required for load shedding systems that is not part of

the main site switchboard. Coordinate with main electrician.

7. Commissioning, testing, and acceptance.

8. Electrical Certificate of Compliance.

9. As-built documents.


10. Operating and maintenance manuals.

11. 12 months maintenance and warranty.

5.3 Regulations and Governing Authorities

The complete installation and its execution shall be carried out by experienced registered

tradesmen using correct trade practices, and comply with the Wiring Rules AS/NZS

3000:2007 including all amendments thereto (henceforth referred to the WR:2007) all

Electrical Supply Authority regulations, and other regulations governing the work involved.

5.4 Electrician’s Responsibilities

The Mechanical Electrician shall:

1. Advise the main electrician details of the electrical loads of all equipment supplied

under the mechanical and hydraulic services subcontracts.

2. Test the complete installation for polarity, insulation resistance and earth loop

impedance.

3. Check the phase balancing at each distribution board under full load conditions and

correct any imbalance.

4. Set any overload protect relays and record the settings, along with the normal

operating currents and hand to the Mechanical and Hydraulic Services

Subcontractors for incorporation in the O&M manuals.

5. Arrange with the relevant authorities for inspections, testing, approval and

commissioning of completed work and rectify any omissions or defects as required.

5.5 Fees and Permits

The Mechanical Electrician shall include all costs and fees associated with establishing the

electrical installation including electrical Certificate of Compliance.

5.6 Earthing

The provision of earth bonding throughout the installation is the responsibility of the

Mechanical Electrician and shall comply with the WR:2007 and all local power supply

company requirements.

5.7 Cabling and Wiring Facilities

All cables shall have copper conductors, include earth continuity conductor and be of the

self-extinguishing type. Cables shall be sized and installed in accordance with WR:2007. All

cables shall be concealed unless specifically exempted on the Drawings or by the Engineer.

The Mechanical Electrician is responsible for ensuring that all provisions for his trade are

provided for at the appropriate stage of construction.

Controls wiring shall be 230V AC or 24V AC/DC. Cable insulation shall be rated accordingly.

Low voltage control, data cable, or communications cable shall be physically isolated from

mains cabling and suitably screened for its purpose.


5.8 Wiring Accessories

Flush boxes shall be metal or polycarbonate plastic accurately located and securely fixed to

the structure.

Locations of accessories and outlets shown on small scale plans are approximate only.

Electrician shall confirm the exact mounting height and location of all outlets with the

Engineer prior to installing outlet boxes or cables.

All motors and equipment shall be fitted with an adjacent load breaker isolator.

5.9 Labelling and Marking

Label all equipment in accordance with WR:2007, and as required for the correct

identification of plant references. Labels shall be engraved white/black/white Traffolyte

fastened with a minimum of two metal thread screws.

Fuse labels and labels on switch fuses shall state the size of HRC fuse links to be fitted.

5.10 Control Panels, Switchboards and Motor Control Centres (mcc)

5.11 General

The specialist panel manufacturer shall be responsible for design of controlling circuitry,

layout of the panel, the incorporated switchgear and wiring, and preparation of

manufacturing and wiring circuit drawings. Manufacturing drawings shall be submitted to

the Engineer for review prior to manufacture.

Control panels shall have:

1. A layout to accommodate the equipment detailed on the plant schedules and

elsewhere in this Specification, and all control equipment, starters etc required to

comply with the specified functionality.

2. Space left to accommodate 20% more items than are to be initially installed.

3. Enclosed live terminals.

4. Busbars in accordance with AS 1136 and marked in accordance with NZS 73:1962.

5. Busbars and circuit breaker chassis rated for a minimum fault level of 18kA/0.1 sec.

6. Adequate earth connection, and where components are mounted on doors, doors

shall be earthed.

7. Neutral and earth busbars, straps or studs provided as appropriate for size of panel.

8. Labelling and identification to all wiring and components.

9. Duct box for outgoing terminals.

10. PVC wiring ducts for bulk wiring routes inside panels.

A typed circuit chart shall be provided inside the fuse/circuit breaker cabinet door. The chart

shall be mounted in a clear plastic pocket. Upon completion of the installation an approved

as-built wiring diagram shall be provided in laminated plastic and fixed to the inside of the

cabinet door. All terminals shall be clearly marked in accordance with the circuit diagrams.


All components in the cabling zone shall be insulated so that future connections within that

zone can be made with all the equipment alive.

All wiring shall be colour coded and installed as above.

5.12 Enclosures

Cabinets shall:

1. Be constructed from 1.2m electrolytic coated steel, panels and frames.

2. Have smooth rounded corners.

3. Be powder coated to a colour as selected by the Architect (interior colour shall be

white).

4. Have front access with the whole assembly being suitable for wall mounting.

5. Include lockable doors with user controls and system indicator lights fitted on the

door panel.

5.13 Motor Starters

Motor starters shall be either DOL or assisted start as required. The Mechanical Electrician is

to allow for all starting requirements to suit specified equipment.

Contactors shall be rated for the motor size and duty and in any case not less than AC3.

Clean contacts shall be provided and wired out to terminals for run, overload.

5.14 As-Built Drawings

The Mechanical Electrician shall keep neat, accurate and up to date records of all deviations

from the Contract Schedules and Drawings.

At the completion of the installation and prior to acceptance prepare as-built schematic

drawings of the complete electrical and controls installation including detailed schematic

diagrams of all control systems and control panels.

5.15 Spares

Spare fuse links shall be provided, three only of each rating and type used on each board

and contained in the racks provided for this purpose.


6.0 AUTOMATIC CONTROLS

6.1 General

The Mechanical Electrician or his representative, shall supply, install and commission the

controls components of the electrical for mechanical services work. The Automatic Controls

section is not a standalone section of this Specification; the Mechanical Electrician shall read

and comply with all requirements of this entire Specification. All requirements of the

Electrical Services for Mechanical section of this Specification apply to this section.

6.2 Scope

The requirements of this controls installation include:

1. Installation of all controls components, wiring, and programming/commissioning

required for a complete and correctly operating system, meeting the functionality

described in this section. This sub-section describes the general intent and

functionality of the controls system and does not attempt to detail all components

that will be required in the system;

2. Coordination with all contractors as required.

3. Commissioning.

4. As-built schematics.

6.3 Component Requirements

All controllers shall be board mounted and complete with the manufacturer’s housings. It is

not acceptable to have exposed controller printed circuit boards within control panels. All

control equipment shall be sized with a minimum of 10% excess capacity over the

connected load.

All controllers, switches, indicators, and thermostats shall be clearly labelled as to function

using permanently engraved labels. Locations of any sensors shall be confirmed with the

Engineer prior to installation.

6.4 General Requirements

1. All equipment shall be run from controllers located in a control panel mounted at

the roof top unit plant in a weather proof enclosure.

2. All equipment shall have switches mounted on the face of the appropriate

distribution control panel. Generally all plant shall also have run and fault lights

adjacent to the appropriate switch. Refer also to the controls schedule for further

detail.

3. Read this schedule strictly in conjunction with the remainder of the specification and

in particular the Electrical for Mechanical and automatic controls sections. Allow for

all controls components, wiring etc for a complete and working system even if not

specifically mentioned herein.

4. Where several groups of plant are listed against a single description, each item of

plant shall individually have the controls listed. (i.e not controlled as a group unless

specifically stated.)


5. Bullet points listed under Automatic Controls interface are a guide and not

necessarily a complete list of all inputs and outputs required to achieve the stated

functions. The controls vendor shall allow for all necessary inputs and outputs.

6.5 Automatic Controls Schedule

Read this schedule strictly in conjunction with the remainder of the Specification, in

particular the Electrical for Mechanical and Automatic Controls sections.

Time scheduling.

1. Allow for time scheduling zones to be set according to client requirements.

2. Toilet extract and fresh air supply systems shall operate under a time schedule.

3. Heat pump systems shall operate under its own time-scheduling.

6.6 Fire mode

All mechanical services plant shall be shut down on receipt of a fire signal. Fire Services

Contractor to provide fire signal to HVAC control boards. The Mechanical Services

Contractor shall provide all control wiring to the mechanical services plant.


7.0 PLANT AND EQUIPMENT SCHEDULES

7.1 Equipment Schedule

Flowrate Pressure Electrical

(L/s) Pa (kW-Volts-Hz)

Gnd & 1st SF01 Fantech TD-800/200N 200 70 1 0.12 - 230 - 50 EDH2560 Wall Switch

Second SF02 Fantech MV252E 220 50 1 0.12 - 230 - 50 EDH2560 Wall Switch

All EF01 Fantech MV254E 180 40 1 0.06 - 230 - 50 N/A Link to Lighting

Gnd & 1st SG01 Holyoake CMP41 100-110 - 4 300 x 300

Second SG02 Holyoake CMP34 110 - 2 300 x 300

All EG Holyoake ECO-M 25-35 - 6 150 DIa

Gnd & 1st EWL01 Holyoake OHL-D 220-200 - 2 900 x 250

CommentsFloor Make Model No. ofSize

(Dia or W x H)

EDH

(Smooth Air)Ref

130301 spec mech issue a 13 nov 2013 so

Documents

spec mechanical issue

mechanical trade

builders work

christchurch issue

consent issue

works protection

inspection facilities

trade coordination