Download Mechanical Particular Spec

Contents
Ref:
Title:
Section One
General
4
2.1.
General
4
2.1.1.
Scope of the Works
4
2.1.2.
Basis of Design
5
2.1.3.
Site Visit
5
2.1.4.
Professional Team
5
2.1.5.
Form of Contract
7
2.1.6.
Standard Specification
7
2.1.7.
Maintenance & Warranty
7
2.1.8.
General Requirements
8
2.1.9.
Provisional Sums
8
2.1.10
Programme
9
Section Two
Description of the Works
10
2.2.
Description of the Works
10
2.2.1.
Air Conditioning
10
2.2.1.1
General
10
2.2.1.2
Material Specification
13
2.2.1.3
System Pressure and Leak Test.
14
2.2.1.4
Pipework
15
2.2.1.5
Condensate Drains
18
2.2.1.6
Commissioning
18
2.2.1.7
Controls
19
2.2.2.
Ventilation
19
2.2.2.1
General
19
2.2.3
Electrical Works
20
2.2.3.1
General
20
Particular Specification
Page:
1
September 2010
Section Three
Appendices.
2.3.1
Drawing Schedule
15
2.3.2.
Technical Equipment Schedule
17
2.3.3
Tender Breakdown
18
Document Tracking.
Issue:
Details:
Date:
Checked By:
001
Tender Issue
21/09/10
GM
Particular Specification
2
September 2010
Section One -General
2.1.
General.
2.1.1. Scope of the Works.
This scope of works, drawings, and specifications relates to the supply, delivery,
installation, setting to work, commissioning, testing and handing over to the client
of a complete mechanical & electrical engineering services installation
associated with the replacement air conditioning to the Restaurant, shop, soft
seating area, coffee lounge,
also replace the R22 refrigerant system in the
following areas: 
Room 1023A

Room 1023

Room 1027

Room 2100

Room 3014

Room 3015

Room 3021

Room 3025
All at Office for National Statistics [ ONS ] at Titchfield.
The mechanical engineering services works will generally be comprised of the
following:
1.
Supply & Installation of new air conditioning equipment to provide heating and
cooling to the restaurant, shop and lounge seating areas.
2.
Condensate drainage.
3.
Associated electrical modification works from existing electrical
supplies.
4.
Installation of air conditioning controls systems linked to the new
AG 150 controller system.
5.
Modification to existing fresh air ventilation system.
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September 2010
6.
De-Gasing (FGas Regs) and Removal and disposal of existing
systems.
7.
Testing and Commissioning.
8.
Craning of plant to and from roof level etc.
9.
Protection of the occupied space during the works.
10.
Maintenance of systems during 12 months defects liability period.
The mechanical engineering services contractor shall recognise and allow for in
their tender the need for close liaison with MITIE’S Facilities Team.
It is the responsibility of the tenderer to visit the site by appointment prior to
submitting his tender. No claim for variation to the tender sum shall be accepted
subsequent to failure to visit site and omission from the tender.
The mechanical engineering services contractor shall include within his tender for
attendance at all meetings required by the client whether on site or at any other
location specified by the client.
The mechanical engineering services contractor shall within his tender make due
allowance for the provision of samples. All samples shall be forwarded to the
client's representative for approval, prior to any orders being placed. This shall
include all items of the mechanical engineering services contractors scope of
works and as a minimum all items that will be visible at the completion of the
works, (including but not limited to: condense pumps, grilles, diffusers, etc.).
The mechanical engineering services contractor should be aware that despite
the detailed nature of the tender drawings, these do not relieve the mechanical
engineering services contractor from the requirements for the provision of fully
coordinated working drawings. These should be of such detail that the
requirements of any structural openings can be confirmed and detailed with the
structural engineers prior to the installation of the ductwork, pipework, etc.
The mechanical engineering services contractor should make themselves fully
conversant with the mechanical services drawings. In particular the mechanical
engineering services contractor shall allow for providing full working drawings
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September 2010
and in addition any required schematics, diagrammatic’s etc, together with
plant rooms, risers and any particular engineering "pinch points", that occur.
The mechanical engineering services contractor is required to allow in his tender
bid for the preparation of working drawings and to keep these drawings
updated for the complete duration of the contract period, as and when revisions
are received by the mechanical engineering services contractor from the
professional team.
These drawings shall then be used to provide the ''As Fitted" documentation and
information, which shall be provided at the completion of the contract, in
accordance with the relevant clauses of the Standard Specification MI.
2.1.2. Basis of Design.
The following documentation has been utilised to form the basis of design:
1) Current CIBSE Standards
2) Heating and Ventilating Contractors Association.
3) Statutory Acts.
4) British Standards and British Standards Codes of Practice.
5) Local Authority Building Regulations.
6) Health and Safety at Work Act.
7) The Gas Safety (Installation and Use) Regulations.
8) Water supply Regulations.
9) F Gas Regulations.
2.1.3. Site Visit.
It is a requirement that the contractor visits the site and inspects the vertical and
horizontal distribution routes, and all areas described within the design pack
during the tender period. All such visits must be arranged via the Project
Manager.
2.1.4. Professional Team.
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September 2010
The contractor should be aware of the following members and details of the
design team.
The Employer:
The Office for National Statistics.
Segensworth Road,
Titchfield,
Fareham.
PO15 5RR.
The Project Manager
Mitie Facilities Services Ltd.
Room 1000.
The Office for National Statistics.
Segensworth Road,
Titchfield,
Fareham.
PO15 5RR.
Tel: 01329 447840
Contact Emran Mannan
M&E Designer:
MITIE Facilities Services Ltd
Room 1.201
Government Buildings
The Office for National Statistics
Cardiff Road,
Newport,
NP10 8XG.
Tel: 01633 456310
Contact: John Davies
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September 2010
2.1.5. Form of Contract.
Details of all contract clauses and conditions, along with other preliminary
information of the main contract are as contained in the separate documents
prepared and issued by Project Manager / Contract Administrator; These
documents shall take precedence where conflicts may occur.
2.1.6. Standard Specification.
Issued with this scope of works and drawings, is a standard specification,
(Reference Mech 1), for materials and workmanship which the contractor will be
required to comply with in full. This document forms part of the complete
contractual documentation package.
Where any of the preliminary sub-clauses conflict with the quantity surveyors or
project managers’ contractual documentation or standard forms of contract,
then the latter will be deemed to take precedence and be included. Any
conflicts shall be notified in writing and issued with the tender return together with
a list of any subcontractor the contractor intends to use on this contract.
The contractor shall ensure that he is fully conversant with the standard
mechanical specification and its contents and requirements.
Any part of the installation provided by the contractor found not to comply with
either this particular specification or scope of works or the standard mechanical
specification will be rectified by the contractor at no extra cost to the project.
Any variations from either this document or the standard mechanical
specification shall be verified and confirmed in writing by the M&E Services
Consultant prior to the commencement of the variant works.
Please note that where reference is made in any of the contract specifications or
drawings to the consulting engineer or the engineer or the professional team this
shall taken to refer to the Project Manager or Contract Administrator once the
contractor has been appointed.
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September 2010
2.1.7. Maintenance & Warranty.
The contractor is required to include in the tender submission a price for the
provision of full maintenance facilities, for all of the engineering services installed
by him for a period of 12 months from the date of practical completion. This will
then run concurrently with the 12 month warranty period provided for all new
equipment and systems.
During this period, the contractor will be required to bear all charges for the
maintenance other than those associated with normal wear and tear.
The contractor will be required to make service visits in accordance with the
requirements and the recommendations of the manufacturer of each particular
piece of equipment installed. A full maintenance agreement shall include the
number of visits and a schedule of equipment to be serviced, as would be
contained in a normal maintenance agreement. The successful contractor shall
provide this document, no later than one month after receiving his appointment.
2.1.8. General Requirements.
The contractor shall allow in the submission of his tender for all of the necessary
sets or diversions, to the new services installation, so as to facilitate a complete
and coordinated installation. No claims for additional costs will be accepted for
local sets, etc.
The contractor shall identify and allow in his tender submission, for all of the
necessary equipment to be installed to complete the works. All mechanical
details and functional details for all of the component parts used to make up any
part of or the complete mechanical installation shall be provided within the
tender submission including literature, such that an advised decision can be
given by the employer / consulting engineer, during the tender analysis. No
changes to the specified manufacturers that will be utilised after the tender
analysis will be allowed.
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September 2010
The contractor shall be responsible for the coordination of the new mechanical
and electrical engineering services installation with the existing structure, services,
false ceilings, risers, and voids, etc. as well as each other.
The contractor will be required to take specific design responsibility in respect of
this contract.
This responsibility includes, but is not limited to the following:
a) All necessary builders work.
b) All brackets and supports.
c) All detailed working and fabrication drawings including coordination
d) The selection and suitability of all materials and equipment specified
by performance.
e) The sizing of the various cable carrying systems.
Where equipment is specified it is the mechanical engineering services
contractors’ responsibility to ensure that the equipment specified meets the
performance criteria.
No changes to the specified manufacturers to be used will be entertained.
The contractor is to confirm the electrical loading and space requirements of the
mechanical services installation. Any revision that may affect the installation of
the proposed services needs to be identified to the Project Manager at tender
stage.
The contractor shall also provide all the information detailed in the standard
specification.
2.1.9. Provisional Sums.
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September 2010
Contained in the ‘Tender Analysis’ within the accompany document is a list of
Provisional Sums. No guarantee is given or is implied that the expenditure of such
sums will be authorised in whole or in part. No claim for loss of profit for any
provisional sums not expended will be entertained.
2.1.10 Programme.
The current programme proposes that the works are to commence 5th November
2010 with all the of the works complete by the end the 24th December 2010. The
contractor is to provide comment on the programme with estimated completion
dates with their tender return.
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September 2010
Section Two - Description of the Works.
2.2. Description of the Works.
2.2.1. Air Conditioning.
2.2.1.1 General.
Restaurant, Shop, Soft Seating Area
The existing main air conditioning system in the restaurant (room 1030) is an IMI
Marstair system of duty around 28KW using R22 as a refrigerant. Current
legislation makes the use of this refrigerant redundant and the systems will have
to be replaced. The Annex or soft seating area to the Canteen uses a single split
Mitsubishi PUH model unit of 8KW capacity using R417A refrigerant.
The contractor is to remove the existing air conditioning system in the restaurant,
shop and soft seating area. The units from the shop and soft seating area are to
be saved to be re-utilised in the gym and the dance studio,
The contractor shall supply and install 4 new Mitsubishi PEFY-P63VMA-ER2 ducted
fan coils in the ceiling void in the restaurant as shown on drawing QL392/M/002.
The contractor shall supply and install 1 new Mitsubishi PEFY-P63VMA-ER2 ducted
fan coil in the ceiling void in the shop as shown on drawing QL392/M/002.
The contractor shall supply and install 1 new Mitsubishi 5kW ceiling mounted
cassette in the soft seating area as shown on drawing QL392/M/002.
The contractor shall supply and install 2 new Mitsubishi 5kW ceiling mounted
cassettes in the coffee lounge area as shown on drawing QL392/M/002.
Room 1023A
Strip out existing air conditioning unit and supply and install 1No. new Dimplex
1.5kW electric panel heater with timer and integral thermostat wired to local
13amp fused spur.
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September 2010
Room 1023
Strip out existing air conditioning unit and supply and install 2No. new Dimplex
1.5kW electric panel heater with timer and integral thermostat wired to local
13amp fused spur.
Room 1027
Strip out existing air conditioning unit knock down wall between 1027 & 1037,
build a new partition wall with 30 minutes minimum fire protection with 30 minute
fire rated beech laminate door with vision panel with pyrostop glass (not
Georgian wire) assembly, ‘Cypher’ code lock and supply and install 2 number
new Mitsubishi Mr Slim PKA-RP35HAL R410A wall mounted air conditioning units as
shown on drawing QL392/M/002. Install perimeter electrical dado rail trunking to
perimeter. Allow for extra over price for new ceiling grid, tiles and 6 no. ceiling
grid light units supply and fit.
Room 2100
Strip out existing air conditioning cassettes 10 no. and all associated equipment,
blank off openings in ceiling with MDF panels painted in RAL9010 eggshell white.
Provide alternative price for ‘de gas’ only leaving units and all associated
equipment in situ
Room 3014 & 3031
Strip out existing air conditioning cassettes and install ceiling mounted cassettes
salvaged from the Shop as shown on drawing QL392/M/004.
Room 3015
Strip out existing floor standing air conditioning units and install 12 number new
Mitsubishi PSA-RP125 GA floor standing units as shown on drawing QL392/M/004.
Provide alternative price for ‘drop in’ gas only
Room 3021
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September 2010
Remove two number wall mounted existing R22 units and install 2 number new
Mitsubishi Mr Slim PKA-RP35HAL R410A wall mounted air conditioning units as
shown on drawing QL392/M/004.
Provide alternative price for strip out and make good only
Room 3025
Remove existing wall mounted existing R22 units and install 1 number new
Mitsubishi Mr Slim PKA-RP35HAL R410A wall mounted air conditioning units as
shown on drawing QL392/M/004.
Provide alternative price for strip out and make good only
Installation
The Restaurant is to remain operational throughout the installation and therefore
the contractor shall have limited access to the site during the normal working
day. Work on the roof shall be permitted during the working day however noisy
operations that could cause disruption will not be permitted. All work shall be
agreed with PM prior to undertaking. Full area protection is required in this area
to ensure that normal service can resume for all restaurant processes including
early morning food preparation, with all furniture replace as per original layout at
the start of each day.
Restaurant - Existing roof lights
It is anticipated that we shall utilise 7 no. roof lights to provide natural lighting in to
the restaurant area with each light dome receiving a UV filming to reduce the
ingress of ultra violet light to the current standard. Please also price for extra over
for the replacement of the domes with ‘Pyramid’ type roof lights from
http://www.glazing-vision.co.uk/hingedpyramid.php
(contact
Chris
Gamble
07538
370256), allow for all flat roof works to ensure weather tightness.
Restaurant lighting
A new lighting system is required to replace the existing, to meet the current standards.
Please allow for –
Grazer LED lighting for each roof light
Ceiling grid lighting to supplement natural lighting
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September 2010
Smart controls including PIR, timer linked to BMS
Restaurant – other systems
Please allow for the installation of –
Broadcast speakers fitted in the ceiling grid – 7 No. (Installed by A IIlingworth – Tel:
01329 823872)
Smoke detectors – replace existing 5000 series with 6000 series (installed by ‘Protec’ –
Tel: 084 54565392 Contact Ricky Mark)
Existing ceiling features are to be protected during works and left ‘in situ’
Please allow PC sum for ‘Air curtain’ over restaurant entrance door, as part of the overall
air conditioning system
Working hours
Working Day Monday to Friday 4PM to 5AM
Weekend – Friday 4 PM to Monday 5AM
The contractor shall have full access to the site from Friday 16.00pm until Monday
5.00am which it is envisaged that the majority of the installation works will be
taking place.
The contractor is to include for full protection of the workspace to ensure that
dust and dirt is not is not left for the occupants during their occupation of the
space. This shall therefore include plastic sheeting as well as dust sheets together
with any cleaning required before occupation of the client.
The works will involve removal of areas of existing ceiling tiles, it is therefore
proposed that these are removed at the beginning of the works and stored
safely, these will then be replaced once access is no longer required. The lighting
and smoke detectors will need to remain fully functional in the correct locations
and therefore these will need replacing prior to any occupation by the client.
The contractor is to allow for the replacement of 200No matching ceiling tiles
(Assume Armstrong Dune for pricing purposes.) to replace any damaged ones,
these shall be used at their discretion and any tiles that are not used are to be
handed to the Project Manager.
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September 2010
Each unit shall have a suitable acoustically lined plenum box fitted to the front
with circular spigots as required. Each spigot shall have its own VCD from which
ridged spiral duct shall run to the diffuser connection. The last 300mm should be
run in acoustic flex to allow some flexibly so that it can be lined up with the
ceiling grid.
Return air to the units shall be via perforated face egg crate type grilles within
the ceiling, these shall allow air to return into the ceiling and back to the rear of
the fFan coils units.
The supply air and return air grilles are to be powder coated, each grille is to
have plenum box or baffle painted black to prevent light entering the space
and so that the ceiling void can not be viewed from below.
Each unit is to be provided with its own remote temperature sensor in order to
provide accurate room temperature control.
All external condenser’s are to be situated in the areas shown on drawing
QL392/M/001 the units are to be supported on purpose built supports on the
original paving slabs.
Each unit is to be fitted with a peristaltic Hi Flow tank type condensate pump as
manufactured by Aspen. The pumps shall be mounted adjacent to the fan coil
unit and pump the condensate to the existing location of the redundant ceiling
cassette unit condensate.
The air conditioning equipment is to be as manufactured by Mitsubishi Electric
and is to be supplied complete with a five year warranty.
The air conditioning works shall comprise of the following:
i) Supply and fixing of all equipment.
ii) Supply and installation of all refrigeration and condensate pumps &
pipework.
iii) All control and communication cabling between the indoor and
outdoor units.
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September 2010
iv) Supply and fixing of controllers and associated cabling.
v) All power wiring for both the indoor and outdoor units together with all
associated electrical works.
vi) Testing and Commissioning.
vii) Protection of the work space during the works.
The contractor shall include for positioning all equipment including crane hire
associated with lifting the outdoor units onto and off of the roof. Where there is a
possibility of any noise or vibration from the equipment passing into the structure
then suitable attenuation measures shall be taken to eradicate this. i.e. the
installation of anti vibration pads or mounts.
The installation of all internal and external units, refrigerant pipework,
interconnecting wiring, commissioning and testing shall be carried out by an
approved Mitsubishi air conditioning installer.
The fixing of all air conditioning equipment, installation of all refrigerant pipework
and full commissioning shall be performed by a specialist refrigerant installer who
has been authorised to install Mitsubishi Electric equipment (certificate of
approval must be submitted prior to commencement on site).
The installer shall clearly state on his/her tender submission any specialist subcontractors he/she intends to employ to carry out the work if not in their direct
employment.
Full access shall be afforded to site during the installation stage of the project to
allow Mitsubishi to verify that installation methods are fully in accordance with
Mitsubishi Electric requirements and that the equipment warranties will not be
invalidated.
All works including labour, materials, plant, tools and equipment will comply with
BS EN378.
Furthermore all of the following points should be adhered to:
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September 2010
The installer retains the responsibility to advise of any aspects which, based upon
experience, would appear to be inappropriate and or likely to lead to
operational problems.
The installer will adhere to the Health & Safety at Work Act and all other relevant
attendant legislation, particularly the management of Health & Safety at Work
Regulations 1992,
Personal Protective Equipment at Work Regulation 1992 and the Construction,
Design and Management (CDM) Regulations.
The installer will ensure that all personnel are in possession of the appropriate
personal protective equipment comply with the Personal Protective Equipment
Regulations.
The installer will ensure that all personnel are fully competent in the work they are
tasked to perform and any claim to stated qualifications are valid.
The installer will ensure that all personnel are instructed to comply with the
prevailing site rules / directions.
All installer will use calibrated and regularly checked tools. Electrical tools will be
calibrated and checked annually.
Upon completion of the works the Contractor will ensure that all debris is
removed and the site is left clean and tidy to the satisfaction of the contract
administrator.
Witnessing of the commissioning of the refrigerant system and final inspection
shall be carried out by both the specialist refrigeration installers and Mitsubishi
prior to offering to the contract administrator.
2.2.1.2 Material Specification.
All refrigeration pipework, interconnecting wiring, condensate pipework, etc.
Between the air conditioning units and outdoor heat pumps shall be installed,
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September 2010
and tested in accordance with the manufacturer's recommendations and the
following codes / standards.
i)
B.S. 4434 . Requirements for refrigeration safety: Part I General.
ii)
Safety code for refrigerating systems utilising chlorofluorocarbons.
Part I. design and construction, published by the Institute of
refrigeration.
iii)
Safety code for refrigerating systems utilising chlorofluorocarbons.
Part II Commissioning.
iv)
Guide to good practice. Unit air conditioning including heat
pumps, published by the Heating and Ventilating Contractors
Association.
The latest edition of the I.E.E. Regulations.
Supply and installation of all interconnecting refrigeration pipework should be
carried out by a Mitsubishi Electric Business Solutions Partner or Accredited
Installer (certificate of approval must be submitted prior to installation
commencement) in accordance with Section 4, Part 1, of the ‘Safety Code for
Refrigerating Systems Utilising HFC’s’ published by the Institute of Refrigeration,
and to BS EN 378 Specification and Mitsubishi Electric Air Conditioning design and
installation instructions. All pipework must be suitable for R410A/R407C as
applicable.
2.2.1.3 System Pressure and Leak Test.
Before the systems are put into service they shall be leak tested and tested for
mechanical strength.
Five Step Strength and Leak Test.

3.0 bar (N2) Minimum of 3 minutes.

15.0 bar (N2) Minimum of 3 minutes.

32.0 bar (N2) Minimum 15 minutes.

41.5 bar (N2) Strength test for a period of time that is acceptable to show
any signs of deformation to the pipework.

33.0 bar (N2) After step 4, drop pressure to 33 bar for final leak test for
minimum 24 hours.
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September 2010
Pressure testing signage will be clearly visible on site during testing periods.
All completed R410A systems will be, leak tested with dry nitrogen as per the
Mitsubishi Electric Commissioning Log Book method statements as below and BS
EN 378. If the system is found to be leak free. The final pressure readings for both
strength and leak testing are to be witnessed and entered into the Mitsubishi
Electric Commissioning Log Book (Method Statement 1).
Three Step Leak Test.

3.0 bar (N2) Minimum of 3 minutes.

15.0 bar (N2) Minimum of 3 minutes.

3. 32.0 bar (N2) Minimum 24 hours. Pressure testing signage will be clearly
visible on site during testing periods.
On completion of strength/leak testing an evacuation is to be carried out to
2mm Hg (2 Torr). This will eliminate the risk of any moisture being present within
the pipework installation. It is recommended that a triple evacuation process be
carried as below and as per the method statement in the relevant
Commissioning Logbook (Method Statement 2). This should then be followed by
a pressure rise test.
Six Step Evacuation.
Evacuate the system to 10 Torr from both service valves. System manifold gauges
‘must not’ be used to measure a vacuum. A Torr gauge must be used at all
times.
Break the vacuum with OFN (N2) into ‘suction’ service valve to 1 bar.
Evacuate to 5 Torr from ‘discharge valve’
Repeat step 2
Evacuate to lowest pressure vacuum pump will achieve (2 Torr for 1 hour
minimum)
Pressure rise test to be carried for a minimum of 30 minutes
2.2.1.4 Pipework.
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September 2010
Longest possible lengths of copper pipe should be utilised to minimise joints on
site. Furthermore all of the following points should be adhered to.
All copper pipe up to 1 1/8’ (28 mm) outside diameter (O/D) shall be fabricated
from refrigerant quality tube to BS EN 12449:1999. Tube shall be fully annealed up
to 7/8’ (22 mm) outside diameter (O/D) only. Tube shall be delivered to site
internally degreased and shall be stored in clean dry conditions with ends sealed
until required for installation.
All due consideration and allowances shall be taken to keep pipework clean
and dry during the installation works. Ensuring that all pipework unfinished ends
are capped off at all times.
The number of joints, bends and sets are to be kept to a minimum. Butt joints will
not be accepted, properly swaged joints must be formed. Bends and sets are to
be machine pulled to an approved radius where possible.
Flared joints must only be used when connecting to the manufacturers
equipment.
Pipework to properly fixed and supported using a recognised and approved
Mitsubishi Electric Partner Programme support system.
Pipe work shall be suitably identified and labelled with Mitsubishi Electric Partner
Programme labels in order to identify each of the systems.
Brazing shall be carried out in accordance with British Refrigeration Association
Specification for Brazing and BS 14324:2004. Brazing rods shall be cadmium free
and conform to BS EN 1044:1999. At all times, when brazing, a small amount of
dry nitrogen must be purged through the pipe to prevent oxidation and scaling
internally. Any component susceptible to heat during the brazing process that
may be damaged must be protected. Soft solder shall never be used for jointing
of refrigeration pipework.
All completed R410A systems will be, strength and leak tested with dry nitrogen
as per the Mitsubishi Electric Commissioning Log Book method statements as
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September 2010
below and BS EN 378. If the system is found to be leak free. The final pressure
readings for both strength and leak testing are to be witnessed and entered into
the Mitsubishi Electric Commissioning Log Book (Method Statement 1).
At all times, when brazing, a small amount of dry nitrogen must be purged
through the pipe to prevent oxidation and scaling internally. Any component
susceptible to heat during the brazing process that may be damaged must be
protected. Soft solder shall never be used for jointing of refrigeration pipework.
The Contractor shall supply, install, test and commission all interconnecting
refrigeration pipework between the condensing units and the connected indoor
units.
The pipes shall be clipped using an approved pipe clamp, in vertical risers
supports such as "Hydrazorb" or similar, which incorporates a synthetic insulating
collar clamped by a plated steel clamp to a corrosion protection (galvanised or
similar) steel or aluminium rail such that the pipe is positively located at each
clamping point. Clamping of pipework over its own insulation shall not be
allowed within vertical risers. The pipework shall be clipped at intervals such that
the pipework cannot sag or distort and at a maximum of 2 meter centres.
Supporting of pipework using tiewraps shall not be acceptable.
Refrigerant pipework shall not be doublebanked or clustered useless space
restrictions necessitate otherwise.
Where located external to the building pipework supports shall be carried on
heavy duty external quality galvanised cable tray supported on galvanised
steels, or Unistrut type corrosion protection supports (all cut ends protected with
Galvafroid paint). A galvanised sheet steel cover (ridged in the centre to provide
rain runoff) shall be provided, framed as necessary in galvanised angle to
provide rigidity and bolted down over any horizontally mounted external cable
tray to provide mechanical protection and rain runoff.
Pipe supports shall not restrict expansion or contraction of the pipe and restraint
shall not be applied to joints or headers.
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September 2010
All pipework (suction and liquid) shall be insulated with slip on close cell
elastometric pipe insulation (as manufactured by Armaflex or equal and
approved), fire rated to Class "0" Building Regulations 1985, with a wall thickness
of not less than 13mm. External pipework insulation shall be protected with
Armaflex paint and shall be covered by a galvanised steel enclosure,
mechanically fixed complete with rain runoff facility. All insulation joints, after
pressure and leak testing, shall be properly glued to Armaflex recommendation
so as to provide a complete seal to prevent any condensation and shall be
clearly marked (yellow tape) for ease of identification.
All of the above works shall be carried out before electrical connection is made
to the fan coil units.
The
R410a
refrigerant
charge
shall
be
calculated
and
weighed
to
accommodate the actual installed and measured length of pipework all in
accordance to Mitsubishi’s recommendations and instructions.
Insulation Identification Thermal insulating material used within any building shall,
when tested in accordance with BS 4764:1970, be classified as non-combustible
also free from substances which in the event of a fire would generate
appreciable quantities of smoke or toxic fumes. Insulating materials of Class ‘O’
rating, as defined by the Building Regulations
Thermal insulation will be fitted to all the pipework installations detailed herein. All
materials used will be ‘non-combustible’ Class ‘O’. All insulation materials,
adhesives and finishes, will be suitable in all respects for continuous use without
degradation throughout the range of operating temperatures and within the
environment indicated.
The materials and method of installation will comply with all relevant British
Standards Codes of Practice.
The material will consist of flexible CFC free, elastomeric black foam with a
closed cell structure. The outer surface of the foam will be an inherent vapour
barrier.
In all cases where pipes pass through fire compartment walls, fire resistant and
nonflammable insulation/foam will be packed between the pipe sleeve and the
pipe. All insulation will be supplied at the thickness specified in HVCA standards.
Particular Specification
22
September 2010
The Mitsubishi Electric Business Solutions Partner or Accredited Installer will apply
identification banding in all instances. Labelling will include the wording
‘Refrigerant under pressure’
2.2.1.5 Condensate Drains.
All condense drains from the indoor units shall be run in either plastic or in
copper, in the case of the latter they will need to be insulated. All condensate
drains to run at a 1:80 min fall and connect to existing. Where it is not practical to
obtain the required fall then suitable low noise condensate pumps of the Aspen
peristaltic type shall be used. For tendering purposes the contractor should allow
for a condensate pump on each unit. This is to be approved by the consultant /
contract administrator before ordering to ensure it is low noise.
A condensate line shall be installed to each fan coil unit. This shall be installed
(and insulated if copper) as per the standard specification. Minimum size of
condensate pipes to be 22mm copper or 20mm plastic, insulated and pumped
or by gravity from each fan coil/cassette,
Pipework will be adequately supported in such a manner as to permit free
movement due to expansion and contraction. Pipework should be graded to fall
throughout, run to waste and should also be fitted with cleanable traps. On
completion, a leak and function test must be carried out.
Gravity drains will be installed whenever possible.
The mechanical engineering services contractor shall include for all sets, joints,
bends and diversions necessary to install the pipework in the ceiling void. No
claims for additional costs in this respect will be considered.
2.2.1.6 Commissioning.
The Subcontractor shall fully commission all equipment and refrigeration systems
to provide the design and performance standards stated in this specification.
The subcontractor shall demonstrate that the systems fully meet the requirements
of this specification to the reasonable satisfaction of the Engineer before the
agreed date of handover of the installation. The final commissioning of the
Particular Specification
23
September 2010
systems however shall be carried out by Mitsubishi, however full attendance shall
be required by the contractor.
2.2.1.7 Controls.
The contractor is to provide a central controller which incorporate 7 day control
per system together with individual controllers for each fan coil on the system.
The central controller is to be situated in the lockable riser as shown on the
drawing, a Modbus interface is also to be included for connection in the future
when the current BMS is replaced.
The VRF Installer shall be responsible for the interconnection control wiring and
containment between the indoor and outdoor units and the control wiring
centralised controllers and all other relevant components.
All control wiring shall be carried out in 2 core 0.5mm 1.5mm PVC non screened
CY flexible control cabling to BS6141 and BS6500 (to comply with CE Regulations
1995) colour coded and separately marked at 3 metre intervals for ease of
identification and maintenance.
Where required control wiring containment shall be steel conduit or cable
trunking. All containment located externally shall be galvanised.
Where the mechanical engineering services contractor requires additional holes
through the steel beams or any other structural element including any holes
through the floor slab the mechanical engineering services contractor must
detail the requirements on builderswork drawings and submit them for approval
by the structural engineer before proceeding.
2.2.2. Ventilation.
2.2.2.1. General.
The mechanical contractor is to allow for all necessary fire stopping / fire
dampers etc. where ductwork passes through fire compartments. The contractor
to ensure this is all ventilation items are coordinated into the building structure.
Particular Specification
24
September 2010
Ductwork, grilles and diffusers unless specified otherwise all sheet metal ductwork
will be manufactured and installed in accordance with HVCA specification
DW/144. Ductwork systems will be designed to give a maximum air velocity of 6.0
m/s on main ducts and 2.5m/s on branch ducts. The ductwork system design is to
take into account the equipment’s characteristics in terms of static pressure
generation and acoustic properties.
The mechanical engineering services contractor shall include for all sets, joints,
bends and diversions necessary to install the ductwork in the ceiling void. No
claims for additional costs in this respect will be considered.
2.2.3. Electrical Works.
2.2.3.1. General.
The electrical requirements in respect of the mechanical services are to be
provided by the contractor by means of local isolators etc. adjacent to the
mechanical items of plant. The contractor shall allow for all extending all existing
supplies
interconnecting
electrical
supplies
from
these
isolators
to
the
mechanical equipment. Although the contractor is not responsible for the
existing electrical supplies it shall be tested prior to connecting equipment to
ensure that the feeds are correct and that no damage occurs.
The contractor shall include for the installation (unless otherwise specified).
including connecting all items of mechanical equipment. The Contractor shall
provide and install all wiring, cables, conduit, trunking, cable trays, termination
points, local means of isolation, control wiring etc., to mechanical plant items to
ensure that all items of equipment and controls fully function in accordance with
manufacturers’ recommendations and the current IEE Wiring Regulations, CIBSE
Codes of Practice, British Standards and UK Building Regulations.
All electrical cables used for power distribution will comply with 17th Edition IEE
Regulations. All cables used for data/control must be greater than 1.25 mm 2core screened. Appropriate glands will be fitted to each item of equipment in
accordance with environmental conditions.
Particular Specification
25
September 2010
The whole installation will be in full accordance with the IEE Wiring Regulations in
every respect with particular attention to clipping, earthing of equipment,
glanding off, final connections and isolating. Earth bonds on refrigeration, cold
water and drainage pipework to be applied, throughout. Equipotential bonding
between exposed conductive parts and extraneous conductive parts at the
same potential, to be applied throughout.
On completion the installation should be tested in accordance with the
requirements of inspection and testing section of the IEE Wiring Regulations.
Inspection shall include physical check that all equipment has been securely
fixed and that all electrical connections are mechanically sound.
Where necessary to prevent damage to components of equipment, the
equipment shall be disconnected for the duration of the relevant tests. Heat
resisting cable should be used in all locations where wiring is subjected to
ambient temperatures in excess of 400C (1040F). A suitable means of isolating
the electricity supply shall be fitted adjacent to and within reach and sight of the
equipment with over current protections.
When running interconnecting control wiring it is essential to avoid the risk of
electronic control signals being corrupted. Care should therefore be taken to
avoid running control cables too close to power cables.
Particular Specification
26
September 2010
Section 3 Appendix 1. 3.1. Drawing Schedule.
Drawing No.
Title:
Rev.
Scale:
QL392/M/001 Site Plan.
T
N.T.S
QL392/M/002 Restaurant Layout.
T
1:100
QL392/M/003 Room 2100.
T
1:100
QL392/M/004 Rooms 3014, 3015, 3021 & 3025.
T
1:100
Particular Specification
27
September 2010
Section 3 Appendix 2.
3.2. Technical Equipment Schedules.
Particular Specification
28
September 2010
Section 3 Appendix 3. 3.3. Tender Breakdown.
QL 392 Replacement Air Conditioning.
Item.
Description of works.
Value £.
Mechanical Services.
1.
Strip out and removal of existing air conditioning systems.
£
Supply and installation of new Mitsubishi fan coils to Restaurant, shop, soft seating
2.
area and coffee lounge as shown on drawing QL392/M/002 & as per description of
£
works.
Room 1023, 1023A Strip out existing air conditioning units, supply
3.
and install 2 number new Dimplex 1.5kW electric panel heater with
timer and integral thermostat wired to local 13amp fused spur.
£
Room 1027, Strip out existing air conditioning unit knock down wall
between 1027 & 1037 and supply and install 2 number new
4.
Mitsubishi
Mr
Slim
PKA-RP35HAL
R410A
wall
mounted
air
£
conditioning units & as per description of works.
Room 2100, Strip out existing air conditioning cassettes and all
5.
associated equipment, blank off openings in ceiling with MDF
panels painted in RAL9010 eggshell white.
£
Room 3014 & 3031, Strip out existing air conditioning cassettes and
6.
install ceiling mounted cassettes salvaged from the Shop.
£
Room 3015, Strip out existing floor standing air conditioning units
7.
and install 12 number new Mitsubishi PSA-RP125 GA floor standing
units.
£
Room 3021, Remove two number wall mounted existing R22 units
8.
and install 2 number new Mitsubishi Mr Slim PKA-RP35HAL R410A
wall mounted air conditioning units as shown on drawing
£
QL392/M/004.
Room 3025, Remove existing wall mounted existing R22 units and
9.
10.
install 1 number new Mitsubishi Mr Slim PKA-RP35HAL R410A wall
mounted air conditioning units as shown on drawing QL392/M/004.
Installation of air conditioning controls system.
Particular Specification
29
£
£
September 2010
11.
Connection to existing condensate drainage including pumps.
£
12.
Protection and cleaning of office environment throughout the works.
£
13.
Testing and Commissioning.
£
14.
Associated electrical works.
£
15.
Craning of plant on and off of roof level.
£
16.
O&M manuals & Record Drawings.
£
17.
Any item considered necessary but not mentioned above.
£
18.
Modifications to smoke detectors and recommissioning of fire alarm system by
£ 5,000.00
Protec.
£ 1,500.00
19.
20.
21.
22.
Replace ceiling grid & Tiles in Restaurant area only.
£ 21,600.00
Replace & up grade lighting in Restaurant area only
£ 11000.00
LED Lighting to Apertures
£ 5000.00
Provisional sums:• Build Upstands to Apertures
£ 6500.00
23.
Provisional sum for entrance door air curtain
24.
Extra over for 7 no. Pyramid roof lights to current regulations standard
25
Alternative price for ‘drop in’ gas only to room 3015 system
26
Alternative price for system ‘de gas’ only to room 2100
27
Alternative price to strip out and make good system in room 3021
28
Alternative price to strip out and make good system in room 3025
29
Extra over for open able hinged pyramid roof light 7 no.
30
Alternative price for introducing air ventilation system in to shop area
31
Maintenance of the systems during the 12 month defects period.
32
Total: Fixed Sum
Particular Specification
£ 3000.00
£
£
£
£
£
£
£
£
£
30
September 2010