Howard Cottage Heating Contract

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Howard Cottage Heating Contract
Howard Cottage Heating Contract
Preambles &
Standard Specification
For The
Installation and maintenance of
Individual
Domestic Heating
And
Hot Water Systems
Notice
Information and data quoted in this document are typical and must be specifically confirmed in writing by HC before they become applicable to any particular
order or contract. The company reserves the right to make alterations or amendments to the detailed specification at its discretion. The publication of
information in this document does not imply freedom from patent or other protective rights of HC or others.
© Copyright HC 2013
Gas Ins Spec/1
Gas Ins Spec/2
1. Preface
1.1.
1.1. Authorisation & Approval
Name
Title
Alan Dulson
Operations Director
1.2.
Date
Author
Change
Draft A
02/02/17
Alan Dulson
1.3.
Date
Change History and Distribution Control
Issue
Abbreviation
BS
PM
CRB
CWDS
O&M
RDSAP
SAP
DLP
HC
GSIUR
LGSR
CSR
HWS
LSV
M&E
SoW
TMV
TRV
Review
Stage
Final
of Revision Description
Formatting
Glossary of Terms
Description
British Standards
Project Manager
Criminal Record Bureau
Cold Water Down Service
Operations & Maintenance
Reduced Data Standard Assessment Procedure
Standard Assessment Procedure
Defects Liability Period
HC
Gas Safety (Installation & Use) Regulations
Landlords Gas Safety Record
Corporate Social Responsibilities
Hot Water Services
Lock Shield Valve
Mechanical & Electrical
Schedule of Works
Thermostatic Mixer Valve
Thermostatic radiator Valve
Gas Ins Spec/3
Recorded
Receipt
Required
NO
Contents
1.0
Preface
1.1
1.2
1.3
2.0
Introduction
2.1
2.2
2.3
2.4
3.0
Purpose
Application
Objectives
Scope
Preliminaries
3.1
3.2
4.0
Authorisation and Approval
Change History and Distribution Control
Glossary of Terms
Project Particulars
Particular Specification/ Schedule of Works
Description of Works
4.1
4.2
4.3
4.4
4.5
4.6
4.7
4.8
4.9
4.10
4.11
4.12
4.13
4.14
Contractor Operative Qualification and Competency
Gas Operative Qualification and Competency
Electrical Operative Qualification and Competency
Site Operative Safety Competency
Operative Competency – Employers Right of Sanction
Scope of Works – Mechanical Installation
Omit
Condition Surveys
Design Calculations
Omit
Voids Installations
Omit
Works Completion Certification and Documentation
Resident Demonstration and Residents Manual
5.0
Site Survey
6.0
Builders Work
7.0
Tendering and Sub-letting
8.0
Quality Standards and Quality Control
8.1
Principles and Approved Items of Equipment
Gas Ins Spec/4
8.2
8.3
8.4
8.5
8.6
9.0
Operation/Maintenance of the Finished Works
9.1
9.2
9.3
9.4
10.0
Dimensions
Standards, Statute and Regulations
Inspection of Completed Works
Test Certificates
Testing and Commissioning of Services – General Requirements
Omit
Omit
Presentation of the Operating and Maintenance Manuals
Data Format
Alterations – Spot Items
10.1
10.2
10.3
System/Performance Objectives
Temporary Supplies
Omit
11.0
Formal Handover Meetings
12.0
Defects Liability Period and Reporting of Warranty Issues
13.0
Hot and Cold Water Systems
13.1
13.2
13.3
13.4
13.5
13.6
13.7
14.0
Plant and Equipment Technical Specification
14.1
14.2
14.3
14.4
14.5
14.6
14.7
14.8
14.9
14.10
15.0
Contract Procedure
System Requirements – General
Mains Water Services
Cold Water Systems
Design Parameters Cold Water Storage
Design Parameters Hot Water Storage
Hot Water Control Requirements
Boilers Serving Hot Water and Heating Systems
HWS Secondary Circulating Pump
Instantaneous Water Heaters
Cisterns
Hot Water Storage Cylinders
Combined Plumbing Units
Thermal Store Units (Indirect)
Direct Thermal Store – HWS and Heating
Un-vented Hot Water Storage Units
Water Meters
Natural Gas
Gas Ins Spec/5
15.1
15.2
15.3
16.0
Pipe Work and Pipe Work Fittings
16.1
16.2
16.3
16.4
16.5
16.6
16.7
16.8
16.9
16.10
16.11
17.0
Appearance
Isolation and Regulation
Spacing of Pipe Work
Gradients
Expansion and Contraction
Bends, Springs and Offsets
Pipes Through Walls and Floors
Temporary Plugs and Caps
Capillary Joints
Compression Joints
Pipe Rings and Clips
Pipe Supports
Low Temperature Hot Water Heating
18.1
18.2
18.3
18.4
18.5
18.6
18.7
18.8
18.9
18.10
19.0
General Requirements
Plastic Pipes and Fittings
Copper Pipe Work and Fittings
Stop Valves
Check Valves
Pressure Reducing Valves
Radiator Valves
Drain Cocks
Pressure Relief Valves
Pressure Vessels
Pressure Gauges
Pipe Work Installation Standards
17.1
17.2
17.3
17.4
17.5
17.6
17.7
17.8
17.9
17.10
17.11
17.12
18.0
Natural Gas – General Requirements
System Objectives
Gas Pipe Work – Particular Requirements
Contract Requirement
General Requirements
Design Parameters
Domestic Boilers
Radiator Pipe Work
Radiators
Control Requirements
Chimneys and Flues
Use of Existing Flue
Fan Convector Heaters
General Ventilation
Gas Ins Spec/6
19.1
19.2
20.0
Electrical Supply
20.1
21.0
Thermal Insulation to Pipelines
Thermal Insulation Workmanship
Testing and Commissioning of Mechanical Services
22.1
22.2
22.3
22.4
22.5
22.6
23.0
Electrical Installations General Requirements
Thermal Insulation
21.1
21.2
22.0
General ventilation Requirements
Grilles/Diffusers
Pressure Testing
External Cleaning of Pipe Work
System Flushing and Chemical Cleaning
Disinfection of Pipe Work
Commissioning of Heating Systems
Gas Safety Commissioning
Handover of Systems – Physical Condition
Appendices A
Gas Ins Spec/7
2.0 Introduction
2.1
Purpose
2.1.1
The purpose of this specification is to define a standard design and the associated
installation criteria for domestic heating and hot water services carried out for and on
behalf of HC in the execution of the Works Contract.
2.1.2
This specification is to ensure that all deliverables will follow the same requirements
irrespective of dwelling type or layout. Works carried out at the design, installation,
testing and commissioning stages shall follow and provide these consistent
standards .
2.2
Application
2.2.1
This standard specification is to be followed by all HC employees, Contractors,
Installation Companies and those organisations acting under instruction from HC
directly or indirectly as sub-contractors or Service Agents.
2.3
Objectives
2.3.1
This specification describes the procedure for developing designs, material type,
installation and post installation deliverables to achieve the following objectives:
 A common and standard specification with consistency of output and quality,
 A controlled documentation process with an audit trail through the lifecycle of
the installation,
 Improved production and delivery efficiency.
2.4
Scope
2.4.1
The scope of this specification provides the following information:
 A standard to be followed for all partial or full system designs
 A set of standards for contract works delivery
 A template, identifying the completion and handover documentation
standards that the contractor will need to achieve as part of contract
completion
 A system for identifying and controlling revisions of design.
3.0 Preliminaries
3.1
Project Particulars
3.1.1
Definitions:
Any references within this specification to the “contractor” shall be deemed to be a
reference to the “principal, main, term or service contractor.”
Any references to the contract works shall be deemed to be a reference to the works
and deliverables.
3.2
Particular Specification /Schedule of Works
Gas Ins Spec/8
3.2.1
The Contractor shall carry out all necessary surveys and provide a detailed working
design for the installation works. The detailed design which shall be submitted as
CAD drawings shall be periodically reviewed and approved by the Contract
Administrator.
3.2.2
The Contractor shall include for pilot installations. These installations shall be subject
to inspection and approval by the Contract Administrator and will set benchmarks for
minimum standards of installation configuration and quality.
4.0 Description of Works
4.1
Contractor Operative Qualification and Competency
4.1.1
The Contractor shall employ qualified, experienced and competent operatives at all
times in the execution of the works.
4.2
Gas Operative Qualification and Competency
4.2.1
The Contractor's attention is drawn to the requirement that all work in connection with
central heating installations, gas work or gas related work activities and appliance
installations must be carried out by suitably qualified operatives.
4.2.2
The Contractor shall be responsible for all costs related to a failure to provide suitably
qualified operatives in order to commence the works to the Contract programme.
4.2.3
The Contractor shall prior to commencement of the Works and throughout their
duration provide information for the Gas Operative Register. The Register shall be
constantly updated to reflect any changes of gas operatives undertaking the works.
The Gas Operative Register must be presented to the Contract Administrator during
the project review meetings to ensure that gas operative qualifications are valid and
have not expired or are due to expire within the Works Contract period. The Gas
Operative Register shall be maintained on site and shall be held by Contractor’s Site
Representative. The Gas Operative Register shall be available for inspection at all
times as a condition of the Works Contract.
4.2.4
The Contractor shall ensure that all work in connection with domestic gas or gas
related work activity within dwellings shall be compliant to Regulation 3 and 4 of the
GSIUR.
4.2.5
The Contractor shall ensure that suitably qualified and experienced gas operatives
are employed that are able to inspect and test existing gas systems, equipment and
appliances that will be incorporated and connected into new installation works. This
is regarded as a common occurrence for the Works and shall be allowed for by the
contractor in the pricing of the Tender.
4.2.6
The gas competency qualifications for the Contractor’s operatives shall include but
not be limited to:
CCN1 – ACS Core Qualification
CEN1 - Boilers (Will evolve into CENWAT1)
Gas Ins Spec/9
HTR1 – Fires
WAT1 – Water Heaters (Will evolve into CENWAT1)
CPA1 – Combustion Analyser
CKR1 – Cookers
EEDH – Energy Efficiency Domestic Heating
The following qualifications are not mandatory but should be covered by the Principal
/ Main Contractor across their engineering level:
DAH1 – Warm Air Heating
MET1 – Gas Meters
UVHW – Un-vented Hot water
Part P - Electrical
4.3
Electrical Operative Qualification and Competency
4.3.1
The Contractor shall ensure that electrical works are carried out by suitably qualified
operatives. The contractor shall provide evidence of competency certification prior to
any works being carried out. The Client reserves the right to request the immediate
submission of any competency certification for any operative engaged by the
Contractor upon electrical works for the duration of the Contract
4.4
Site Operative Safety Competency
4.4.1
The Contractor shall employ operatives with the necessary site safety training and
qualifications for the site construction works.
4.4.2
The Contractor shall also employ site management and operative supervision with
the associated enhanced levels of site safety qualification and certification.
4.4.3
The Contractor shall provide evidence of safety certification (e.g. CSCS cards) on
request.
4.5
Operative Competency – Employers Right of Sanction
4.5.1
The Contract Administrator shall have the authority to require immediate removal
from the site of any Contractors operative that lacks the qualification, experience or
competency to deliver the works to the required terms and conditions of the Works
Contract. The Employers representative shall confirm in writing, within 24 hours, the
reasons for removal to the Contractor. The Contractor shall be responsible for any
costs consequent to removal of an operative from the site.
4.6
Scope of Works – Mechanical Installation
4.6.1
The contractor shall supply, install, test and commission and set to work the
complete mechanical installation.
4.6.2 The following is the summary of the various stages within the contractor’s scope of
works:

Condition surveys of each property, the property types and their respective
layouts
Gas Ins Spec/10

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



4.7
Set up procedures for the development and production of the O&M
Manuals. The draft O&M Manual will be kept on site as the works progress
Supply and install the main works
Test and commission the Works
Issue the O&M manual that has been approved by the Employers representative
Demonstrate operation of the working installation to the permanent occupants
with reference to the relevant O&M information
Provide a service during the 12 month defect liability and maintenance service
period following formal acceptance of the Works by the Employers
representative.
Omit
4.7.1
4.8
Condition Surveys
4.8.1
The Contractor shall undertake suitable pressure and flow rate testing of the gas and
water services to confirm that adequate pressures and flow rates are available to
meet the proposed full load conditions. The Contractor shall verify with the Contract
Administrator the method of testing, duration of test period and provide results
obtained.
4.8.2
The Contractor shall include the costs of any temporary works that are necessary in
order to carry out these tests.
4.8.3
The Contractor shall issue a drawing of the existing services with the survey report to
the Employers representative.
4.8.4
The Contractor shall ensure that the survey provides all of the necessary information
to proceed with the detailed working design and production of any associated
calculation. No variations will be issued by the Employer that are consequent on the
Contractor’s insufficient knowledge of the site.
4.9
Design Calculations
4.9.1
The contractor will be required to provide RDSAP and/or SAP ratings on all new
installations.
4.9.2
All heating systems shall be classified as per the Central Heating
Specifications (CHeSS) Basic practice or Best practice, unless instructed otherwise
by the Employers representative.
4.10
Omit
4.10.1
4.11
Voids Installation
Gas Ins Spec/11
4.11.1 The Contractor shall establish whether there are gas, electrical and water supplies
available to enable the installations to be carried out.
4.11.2 The Contractor shall take meter readings prior to, and after completion, of the
installation in order to ensure that responsibility for energy costs are allocated before
the site works commence and on their completion and acceptance.
4.11.3 Where the gas supply has been cut off, the contractor shall carry out the installation,
but carry out a hot flush, dose etc., to the completed water system installation. The
contractor shall then allow for final commissioning immediately before a new resident
moves in and the gas supply is re-established.
4.11.4 The Contractor shall provide temporary connections, as necessary, to enable these
interim works to be tested and commissioned, leaving the system in a safe condition,
including capping off of the gas supply.
4.11.5 The Contractor shall label the boiler with a contact name and telephone number for
completion of the commissioning and also confirm this to the Employers
Representative
4.12
Omit
4.12.1
4.13
Works Completion Certification and Documentation
4.13.1 On completion of the works and demonstration of the installed systems following
commissioning, the Contractor shall supply for each dwelling a copy of the following:






“Benchmark Book” for the Boiler. This book will contain specific information
relating to serial numbers, installer, test parameters and measurements
“Benchmark Book” for the HWS Storage Vessel.
LGSR completed as per requirements.
Chemical Cleaning and Dosing – Sample test certificate.
Building Regulations Compliance/Boiler Notification Certificate.
Disclaimer, exception and waiver letters on issues agreed on site – signed by the
Employers Representative and Property Resident.
4.13.2 The fully completed certificates and documentation shall be delivered to the
Employers representative as part of the hand-over pack.
4.13.3 A "Summary/Warranty Schedule" shall be maintained by the Contractor, who shall
issue the latest up-date/revision of this at each progress meeting with the
Employers Representative. The completed schedule shall be issued prior to handover to the Employers Representative and be included in the O&M manuals and the
project Health and Safety Plan.
4.13.4 The Contractor shall provide the hand-over pack that has been accepted by the
Employers Representative as part of the process of final inspection and handover of
a property.
Gas Ins Spec/12
4.13.5 The Employers Representative reserves the right under the Contract to decline
acceptance and handover where the hand-over pack has not been signed off as
complete irrespective of whether the physical installation is complete and operational.
4.13.6 The Contractor shall note that further details of the O&M Manuals are contained in
section 9.0 of this document.
4.14
Resident Demonstration & Residents Manual
4.14.1 The Contractor shall provide a combination of detailed written and verbal instructions
to the residents regarding operation where appliances and/or equipment have been
renewed or installed. This shall consist of the Contractor providing residents with
manufacturer’s instructions (in spoken language if possible) and giving demonstration
on the correct operation & effective use of all user equipment relevant to the
installation as per the appropriate Approved Document Part L section of the
Building Regulations 2010.
4.14.2 Witten instructions and manuals and certificates shall be placed in a properly sized,
new, labelled folder that will be in an agreed location within the dwelling.
5.0 Site Survey
5.1
The Contractor shall survey the site and existing services including dwellings and
common areas and shall assess how these existing conditions impact on the
proposed works. No variations will be issued on the basis of the contractor’s
insufficient knowledge of the site.
6.0 Builders Work
6.1
The Tender is deemed to include for all builders work required in connection with the
contract. The contractor shall ascertain the extent of stripping out required from the
details contained within the specification, the schedule of rates and by site survey
during the tender period.
6.2
Builders work shall (in accordance with current standards and regulations) include
but shall not be limited to

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







fire stopping
provision of fire barriers at each floor level of vertical ducts
investigations of structure
trenching
ducting
reinstatement
removal and reinstatement of suspended ceilings, ducts etc
cut outs to ceilings etc.
holes through structure, walls, floors, etc.,
making good
lifting and reinstatement of floors, floor coverings
painting of all surface containment systems
dust sheeting, movement of furniture etc.
Gas Ins Spec/13
6.3
Builders Work in relation to Back Boilers
6.3.1
Where an existing back boiler is installed within a property, the Contractor shall
remove the back boiler including draining down, disconnection and builders work.
The builder’s work shall include for the removal of the back boiler and reinstatement
of the chimney. The reinstatement of the chimney shall include for bricking up,
plastering, making good and installing a suitably sized vent within the chimney and
painting.
6.3.2
Where an existing fire surround is in place a suitable board and vent
arrangement will be considered to a decorative finish and vented to current Building
Regulations. The Contractor shall agree this design detail with the Employers
Representative
If vulnerability issues are identified in terms of the resident’s requirements, HC will
look to install an ‘Electric Fire’ in place of a gas fire replacement
6.4
Builders Work in relation to relocation of floor standing/wall mounted boilers
6.4.1
Where the proposed Works indicate that the existing boiler shall be relocated,
the Contractor shall allow in the Tender sum for the repositioning of the boiler
of up to 3.0 Metres from its original position, as well as pipe work
replacement/modification and a boiler flue extension kit/plume kit. Where
necessary, a further allowance for boxing in (including inspection panels) the
flues/plume kits traversing the balcony shall also be deemed to be included in the
tender.
6.5
Builders Work in relation to relocation of radiators
6.5.1
The contractor on surveying a property shall note the location of the radiators.
Where the radiators are not located under the windows the Contractor shall
relocate and resize the radiator(s) under the windows.
6.5.2
The Contractor shall also allow for builders works in association with the
relocation of the radiators. This builder’s work shall include for filling in, plastering
and decorating the area where the radiators were removed.
6.5.3
The Contractor shall co-ordinate with the Employers Representative to ensure that
any specific resident preferences are incorporated into the detailed design
6.6
Builders Work in relation to three or more pipes
6.6.1
The tender shall be deemed to include for the encasing of three or more pipes in
parallel runs. The pipe work shall first be hydraulically pressure tested and insulated
(refer to later section for insulation detail) before applying the casings. The casings
shall be of suitably sized, pre-formed, pre-finished MDF or plywood construction, with
a white melamine finish.
Gas Ins Spec/14
6.6.2
Casing manufacturer, make, model and type shall be selected from the HC Asset
Management approved list.
6.7
Builders Work in relation to Flues running across the balconies
6.7 1
The tender shall be deemed to include for the encasing (including inspection panels)
of the flues running across the balconies terminating with a stop end. The flues shall
first be tested before applying the boxing. The casings shall be of external use
quality, suitably sized, pre-formed, pre-finished MDF or plywood construction, with a
white melamine finish. The casings must be constructed in such a manner as to
allow for the flue to be easily inspected throughout its length at a later date but
with particular emphasis on inspection of all flue joints and connections.
6.8
Builders Work in relation to the threshold at balcony doors
6.8.1
The tender shall be deemed to include for extending the threshold at low level and
boxing in pipe work at high level of balcony doors to accommodate the route of pipework. The pipe-work shall first be pressure tested and insulated before covering the
threshold.
7.0 Tendering/Sub-letting/Supply
7.1
Selection of Manufacturers/Suppliers/Subletting
7.1.1
The Contractor shall prior to commencement provide details of all companies that are
providing either labour or materials in the delivery of the Works
7.1.2
Refer to Condition of Contract with regard to Sub-letting
8.0 Quality Standards and Quality Control
8.1
Principles and Approved Items of Equipment
8.1.1
The Contractor shall only install items of equipment approved by the Contract
Administrator. The Contractor shall be responsible for all costs relating to the
replacement of non-approved items of equipment installed by the Contractor in the
first instance
8.1.2
Approved list of appliances and materials to be used on Domestic Heating
Replacement Project can be found within the Appendices section A of this document.
8.1.3
Where manufacturers, suppliers or installers of products are NOT identified by name,
they are to be selected from the HC Asset Management approved list. Selected
products must comply in all respects with the specification; as and when requested
must demonstrate such compliance.
8.1.4
Where the approved list does not provide a suitable manufacturer, supplier or
installer of products, instruction shall be sought from the Employers Representative.
8.2
Dimensions
Gas Ins Spec/15
8.2.1
The Contractor shall indicate on detailed drawings and survey information any critical
dimensions that relate to the Works.
8.2.2
The Contractor shall not take dimensions by scaling from an existing drawing, but is
to establish this information from actual site survey
8.3
Standards, Statute and Regulations
8.3.1
The Contractor shall execute the whole of the works using materials,
components and accessories to fully comply in all respects with the HC Approved Lists, relevant industry standards, statutory requirements, regulations,
byelaws and in particular the current Gas Safety (Installation and Use)
Regulations.
8.3.2
The Contractor shall provide all materials and works in accordance with the
appropriate British Standard (BS) or Code of Practice (CoP) and where no BS or
CoP is applicable the Agreement Certificate for the particular item.
8.3.3
The Contractor shall comply with the requirements of the Local Authority Building
Control including attendance for visits to site by their Officers and their instructions
with regard to the works installation and its associated approval by them.
8.4
Inspection of Completed Works
8.4.1
The Contractor shall inspect all works before offering them to the Employers
Representative.
8.4.2
The Contractor shall ensure that the Works offered to the employers Representative
are complete and free of all snagging items.
8.4.3
The Contractor shall if required, before inspection by the Employers Representative,
provide documentary evidence of the Contractors inspection and that all deficiencies
have been completed
8.5
Test Certificates
8.5.1
Where testing specific to the project is required the Contractor shall provide test
certificates including
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8.6
Project title.
Address.
Details and date of test.
Instruments used, serial numbers, calibration dates.
Signature of those witnessing test.
Contractor's name.
Specific location of the item in the Works.
Testing and Commissioning of Services - General Requirements (see also
Section 22.0 )
Gas Ins Spec/16
8.6.1
The Contractor (or approved specialist sub-contractor) shall provide a programme for
pre-commissioning checks, setting to work, commissioning and performance testing,
and allow for all costs incurred.
8.6.2
Where required by the Employers Representative the Contractor shall provide formal
method statements supported by risk assessments detailing commissioning
procedures.
8.6.3
The Contractor shall give notice to the Employers Representative and state any
requirements for the attendance and co-operation of others in the testing and
commissioning of the installation or parts thereof. The period of notice shall not be
less than 7 calendar days
8.6.4
The Contractor shall provide all necessary facilities to enable tests to be
witnessed and inspections carried out either on site or at the manufacturer's
works.
8.6.5
The Employers Representative will only witness tests, confirm recorded results and
determine if the specified test requirements have already been achieved.
8.6.6
If following test or inspection any plant or part thereof is shown to be
defective or not conforming to the specification the Employers Representative will
reject such defective parts by written notice, within reasonable time, indicating area
of dispute.
8.6.7
The Contractor shall employ a competent and experienced engineer to supervise the
whole of the testing, commissioning, performance testing and notification of
Employers staff. The scope includes providing all specialised personnel (including
manufacturer's representatives) and the co-ordination of their activities.
8.6.8
The Contractor shall not paint, cover, encase or enclose any system component until
associated testing is complete where test failure would require removal of such
protection.
8.6.9
The Contractor shall use calibrated test instruments with certificates to test and
commission the Works.
8.6.10 The Contractor shall complete the testing of individual system components before
proceeding to whole system functional and performance testing. As part of whole
system testing the Contractor shall ensure that the system is in a safe, clean and
permanent configuration that accurately represents the permanent operational
environment.
8.6.11 The Contractor shall maintain the testing and commissioning file on site for
inspection when required by the Employers Representative
9.0 OMIT
9.1
9.2
OMIT
OMIT
Gas Ins Spec/17
9.3
Presentation of the Hand-over Pack
9.3.1
The Hand-over pack shall be presented in the format of a CD disc record document,
with copies of ALL certificates etc. (see above) scanned in PDF format and various
schedules etc. The Format of how the records are saved on the disc is to mirror
format & contents as described below in Section 9.4. A minimum of 2 copies of the
disc shall be provided and these shall have full labelling of the disc and
case/jewel cover.
9.4
Data Format
9.4.1
The format of data should be produced in an excel/csv format
9.4.2
The following general principles/format applies to both planned and completed
major works:
UPRN (in column 1), Address, Central Heating* (e.g. Manufacturer / Model / GC
Number), Date of Completion (format dd/mm/yyyy), and Warranty period (in days
with start & end date).
9.4.3
Document Attachments
File names should be recorded in the following format:
UPRN.address.docname.pdf/jpg etc. To ensure we minimise data growth,
photographic images should be no more than 3mp (preferably lower if resolution
detail is not required). Reports which contain photos and diagrams etc. should
generally be exported into the PDF format to keep file size down to a minimum
10.0 Alterations – Spot Items
10.1
System / Performance Objectives
10.1.1 The Contractor shall disconnect, strip out and dispose of those parts of the
existing mechanical installations made redundant by the new installation. Any
existing mechanical installations to be retained shall be left in a safe, operational and
satisfactory condition.
10.1.2 The Contractor shall allow for carrying out of survey work on site to identify the
condition and use of existing equipment prior to stripping out works commencing.
The survey to all dwellings and external works shall be carried out at the start of the
contract.
10.1.3 The Contractor shall agree the exact extent of stripping out work with the Employers
Representative before works commence.
10.2
Temporary Supplies
10.2.1 The Contractor shall include within the Tender for the provision of all
necessary temporary supplies required in connection with the works.
10.2.2 These temporary supplies shall include temporary power supplies, relocations
of existing supplies and temporary relocations of existing equipment necessary in
Gas Ins Spec/18
order to carry out the works and all temporary supplies necessary to maintain
tenant’s emergency equipment.
10.2.3 No dwelling shall be left without power, heating or water services for a period
exceeding 7 hours during a single calendar day.
10.3
OMIT
11.0 Formal Handover Meetings
11.1
Prior to Practical Completion being awarded, there will be a formal handover meeting
with the Asset Management Team. The “Final Approved” hand-over packs will be
issued prior to that meeting and a review of the installations, and the subsequent
Defects Liability Period Procedures will be agreed as part of the agenda.
12.0 Defects Liability Period and Reporting of Warranty Issues
12.1
During the 12 month Defect Liability Period (DLP) the contractor MUST report
all notified defects and warranty call requests made to the manufacturers – via an
agreed process/format to HC Asset Management. In addition, this information MUST
be sent via e-mail to the Employers Representative within 24-hours of the report
being logged.
12.2
All works shall be guaranteed for a period of twelve months from completion
against all material and labour defects. Appliance manufacturers extended
warranties may apply.
12.3
The ultimate responsibility for all defects for the complete system remains with
the Contractor. Therefore the Contactor is responsible for managing and
rectifying all defects and shall report and log in an agreed format. Where the
Contractor uses the manufacturer’s warranty i.e. a manufacturer’s engineer, the
repairs must be attended within 48 hours and completed within 72 hours. If these
time limits cannot be adhered to, the Contractor shall attend, rectify the fault and
restore service within the time constraints given above.
13.0 Hot and Cold Water Systems
13.1
Contract Procedure
13.1.1 The Schedule of Works will be issued as an instruction by the Employer to the
Contractor for the elements of works to be carried out in each dwelling. Each
dwellings work will be individually dependant on the results of the individual property
survey findings combined with the Employers procedures and criteria for system
upgrade and hosing stock standards. Therefore, part or full system renewals may be
carried out by the Contractor as the final scope of works.
13.1.2 The price for the works for each dwelling shall be agreed by the Contract
Administrator and the Contractor before the installation works commence.
Gas Ins Spec/19
13.1.3 The Contractor shall not start work without the issue and receipt of an order number
from IBS.
13.1.4 The tender schedule will therefore be used as a pricing document for either the parts
or whole system replacement
13.2
System Requirements - General
13.2.1 To provide and install new and replacement hot and cold water storage and
distribution for kitchen and bathroom purposes without leakage under working
conditions, including cold fill supply to heating boilers.
13.2.2 All connections to appliances and outlets shall be provided with
isolation/maintenance service valves. ALL valves to be full bore and full flow. Make,
type and model of valve to be agreed with the Employers Representative
13.2.3 Ensure all water fittings and materials are listed in the Water Fittings and Materials
Directory published by WRAS and comply with current Water Regulations.
13.3
Mains Water Services
13.3.1 Each dwelling shall be provided with a separate Local Water Authority cold water
main supply to provide drinking water to the kitchen sink and feed to cold-water
storage tank and cold feed to heating system/boiler. The Contractor shall check
space and tank support details before installation.
13.3.2 Where instructed by the Employers Representative single floor/bedroom dwellings
on lower floors (ground floor and first floor only dwellings) may be fitted with
combination type boilers, these boilers may be served via the properties cold
water main supply providing the cold water main pressure and flow rate etc. is
adequate to meet full load conditions. All works must be in accordance with the
current Water Regulations.
13.3.3 Drinking water shall be provided to each kitchen sink.
13.4
Cold Water Systems
13.4.1 For replacement systems the Contractor shall isolate incoming cold main, drain down
cold water system, dismantle storage tank, overflows and cold feed stop valves,
cut up tank and remove from site all redundant tank and pipe work. This
includes “dead-leg” and “Sub-ends” services that are also to be removed.
13.4.2 The Contractor shall supply, install and test, a replacement equivalent volume or
design parameter storage tank to comply with current regulations. The tank to be
complete with new-screened overflow/warning pipes, vents, tight fitting lid or raised
ball valve access covers, drain valves, stop valves, ball valves and down service
isolating valves. Clean, fill, flush and test tank, flush pipe work, disinfect system,
drain and refill.
13.4.3 Wall mounted tanks, where fitted, are to be provided with securely bolted galvanised
angle iron support frames.
Gas Ins Spec/20
13.4.4 The Contractor shall re-insulate all water services in the tank enclosure area
13.4.5 Sealed system boiler cold fill connections to are to be made with double check valve,
stop valve and flexible connection (filling loop). Flexible connections are to be
removed and valves capped-off upon completion of commissioning.
13.4.6 Generally the communal Cold Water Down Service (CWDS) shall be retained and
reused. The CWDS distribution pipe work installed within the property will be
replaced and the new pipe work shall be connected to the communal supply at point
of entry into the property.
13.4.7 Where instructed by the Employers Representative the dwelling may be converted to
an “all mains water supply”.
13.5
Design Parameters Cold Water Storage
13.5.1 Insulated tanks are to provide 45 litres per person and not less than 227 litres (50
Gallons), for the provision of hot and cold water supplies within a single dwelling.
However, if a dwelling is served via a communal CWDS, serving a HWS break tank
(with direct feeds via the CWDS to other CWS outlets), then the HWS break tank can
be 117 litres (25 Gallon) per dwelling.
13.5.2 Equipment shall be installed in accordance with the current Water Regulations
and be constructed of a material acceptable to the Employers Representative.
13.6
Design Parameters Hot Water Storage
13.6.1 At 35 litres per person and not less than 80 litres per dwelling. The minimum
size of indirect hot water storage cylinders shall not be less than 120 litres,
the minimum capacity of a thermal store shall be no less than 140 litres, or unless
agreed with the Employers Representative. Indirect HWS Storage Cylinders shall be
pre-insulated, fast recovery heat up (the recovery time should be as dictated
within Building Regulation 2010, Approved Document Part L1 ) cylinders served
from the heating boiler with stand-by electrical immersion heaters (3kW minimum).
13.6.2 HOT WATER TO BE STORED AT 60 DEGREES CELCIUS INCLUDING
CIRCULATING PIPE WORK WHERE APPLICABLE.
13.6.3 When selecting and sizing the hot water storage cylinder the Contractor shall
note the comments & issues by the Employers Representative concerning the
heating system selections and therefore the primary HWS supply design
temperatures.
13.6.4 The HWS storage shall be primarily via indirect hot water storage cylinders –
alternatives are listed below but must be confirmed and approved by the Employers
Representative before proceeding.
Gas Ins Spec/21
13.6.5 Where a new hot water storage cylinder is fitted to a supply fed from a communal
roof top tank, the open vent pipe shall terminate over a separate discharge tank or
system.
13.6.6 Design to BS6700: simultaneous demand, and Water Regulations. Also to include
issues covered with the Building Regulations 2010 e.g. Part L and also the HSE
ACoP Document L8.
13.7
Hot Water Control Requirements
13.7 .1 Control of hot water storage cylinders to be via suitably sized motorised valve, two
port on/off valves (5 wire model, including end-switching) via the dictates of
pocket immersion thermostats.
14.0 Plant and Equipment Technical Specification
14.1
Boiler Serving Hot Water and Heating System
14.1.1 Manufacturer, make, model and type shall be selected from the HC Asset
Management approved list (see Appendix A).
14.2
HWS Secondary Circulating Pump (where included)
14.2.1 Manufacturer, make, model and type shall be selected from the HC Asset
Management approved list (see Appendix A).
14.3
Instantaneous Water Heater(s)
14.3.1 Either gas or electric, where instructed on the schedule of works or particular
specification.
14.3.2 Manufacturer, make, model and type shall be selected from the HC Asset
Management approved list (see Appendix A).
14.4
Cisterns
14.4.1 Individual dwellings cold water storage cisterns are to be of GRP construction
(unless agreed otherwise with the Employers Representative).
14.4.2 Each tank shall be fitted with a float valve ≥ 15mm on the supply and an overflow one
size greater than the cold-water inlet pipe. This shall be extended to discharge
externally.
14.4 3 Isolation valves shall be fitted to the supply pipe and to all outlets except for the
overflow
14.4.4 Application for replacement tank in roof void, tanks to be GRP type. Redundant tank
to be removed through an enlarged ceiling access hatch. Where possible,
replacement tanks are not to be sited directly above a habitable area (bedroom,
lounge etc.).
Gas Ins Spec/22
14.4.5 Tanks to be provided with new, suitably dimensioned marine plywood support
sheet of suitable thickness (5 ply minimum), including sufficient access support to
the ball valve, from hatch.
14.4.6 Tanks sited at high level within a room shall be fitted with a canter-levered
angle iron, frame with a suitably dimensioned plywood support sheet.
14.4.7 Tanks mounted on flat roofs, to be provided with a suitable housing, suitably secured
to the roof, subject to roofing details and prior agreement with the Employers
Representative.
14.4.8 Where required on the heating systems a Feed and Expansion Tank of
suitable size and construction shall be provided. Each tank will incorporate an
isolation valve on the incoming supply and contain overflows as described above.
Valves shall not be fitted within the tank’s outlet pipe-work serving the heating
installation.
14.5
Hot Water Storage Cylinders
14.5.1 The application shall be as scheduled for new and replaced cylinders and
accessories, with calculation of capacity and design for the space available.
14.5.2 The Contractor shall isolate, drain and remove existing cylinder from site. Supply,
install, test and commission a new cylinder, mounted on 18mm nominal ply board (5
ply minimum) on 50x75mm timber bearers. Plywood base drilled to allow sufficient air
circulation around the base of the unit.
14.5.3 New hot water storage cylinders shall be fitted with new top/side 3 kW (unless
otherwise specified by the Employers Representative) stand-by immersion
heaters, with rod thermostat, incorporating a secondary high limit temperature
cut-out and new heat resistant flexible cable to local connection point or switch.
14.5.4 The immersion heater shall be protected by an easily accessible independent
fused connection unit with a neon indicator incorporated. The length of the
immersion heater shall be appropriate to the size and type of cylinder
installed. The immersion heater must be installed so that access for removal
and replacement is made easy without the need for removal of the cylinder.
14.5.5 All cylinders shall be pre-insulated (insulation specification and thickness to be
in accordance with the relevant section of Building Regulation 2010, Approved
Document Part L) and free from any defects in either cylinder or insulation.
Unless otherwise specified, the cylinder shall incorporate an immersion heater boss
complete with brass plug and sacrificial anode.
14.5.6 An open vent expansion pipe of no less than 22 mm diameter will be fitted to the
cylinder, and terminate over the cold water tank without obstruction.
14.5.7 Where a hot water cylinder has a pocket to accommodate an insertion type
cylinder thermostat, this pocket must be used to give greater control over the
temperature of the hot water and to prevent pitting corrosion.
Gas Ins Spec/23
14.5.8 Manufacturer, make, model and type shall be selected from the HC Asset
Management approved list (see Appendix A).
14.6
Combined Plumbing Units
14.6.1 Combined Plumbing Units Application shall only be used where specified and
instructed.
14.6.2 Combined plumbing units shall be supplied and installed as a complete integrated
unit constructed on a steel frame with all inter-connecting pipe work. This shall be
complete with an indirect hot water storage cylinder (as specified above). The cold
water storage tank shall be a black polythene cistern (as specified above) conforming
to WRC requirements and all ancillary fittings conforming to relevant standards
(including valves etc.).
14.6.3 An additional frame detail shall be incorporated to introduce a shelf above the
cylinder with a wire mess platform, to raise the CWS tank and maximize the static
head of the CWS from this unit. The contactor shall measure the available head
within the location area of the unit (when carrying out their condition surveys) and
add at least one shelf of 150mm or more if possible to achieve this.
14.6.4 The Contractor shall allow for suitably sized two port on/off valves (5 wire model,
including end-switching), to be supplied, mounted and pre-wired (with remote loose
items – programmer, programmable room stat, room stat as detailed within the
schedule of work).
14.6.5 The Contractor shall review access arrangements for service connections at the front
of the units with the Employers Representative, before placing orders for these types
of units.
14.6.6 Manufacturer, make, model and type shall be selected from the HC Asset
Management approved list (see Appendix A).
14.7
Thermal Store Units (Indirect)
14.7.1 The Contractor shall only install this type of equipment where specified by the
Employers Representative.
14.7.2 Indirect Thermal Store – HWS Only (As per manufactures definition)
14.7.3 All units shall be of a manufactured package type, i.e. all sundry parts and equipment
being covered within one CE Approval.
14.7.4 The thermal store unit shall be of the indirect combination type complete with an
integral feed and expansion tank. The integral feed and expansion tank shall be
capable of accommodating the expansion of a minimum 200 litres primary
circuit excluding the store (direct unit only).
14.7.5 The indirect thermal store shall be supplied with
indirectly by the boiler. The stored water in the
and separate from the primary water due to
exchanger mounted within the unit. In some
Gas Ins Spec/24
two coils and shall be heated
thermal store shall be static
the high recovery coil heat
instances, subject to Employer
Representative approval, a packaged unit may be used incorporating a plate
exchanger in lieu of a coil system.
14.7.6 The thermal store shall be compatible with a suitably sized 3 port mid-position
motorised valve control system.
14.7.7 The units shall be capable of a minimum secondary hot water flow rate of 25 litres
per minute at 2.0 bar pressure for single bathroom application and greater for larger
installations. Flow rates shall be controlled to reflect the performance of the
unit by being able to restrict the maximum hot water flow rate.
14.7.8 Indirect primary connections and potable connections shall be as per the
manufacturer’s instructions Tapings shall be within a 90 degree arc to assist
access on installation and maintenance. The units shall be capable of fitting
through a standard doorframe 600 mm (575mm actual) and shall have a minimum
foot print area of 650 mm x 600 mm.
14.7.9 The unit shall be supplied complete with ball valve and float fitted in static store cold
fill and expansion section with fitted lid, expansion vessel, blending valve and filter,
service valve for the cold water mains connection, 3 bar pressure reducing
valve, immersion thermostat, immersion heater boss, flow and return primary
connection, drain point and shall be supplied pre-plumbed.
14.7.10 The primary water circuit including the static store in the thermal store unit shall be
treated with suitable inhibitors (refer to HC Asset Management approved list for
detail). The contractor shall ensure that the guarantee is maintained by adhering to
the manufacturer’s instructions and recommendations.
14.7.11 The installation shall comply with the current Water Regulations, Building
Regulations and best industry practice and in accordance with manufacturer’s
guidelines. The Contractor shall ensure that the HWS temperature at each
outlet meets the temperatures detailed within the manufacturer’s instructions.
14.8
Direct Thermal Store – HWS and Heating
14.8.1 The Contractor shall only install this type of equipment where specified by the
Employers Representative.
14.8.2 Manufacturer, make, model and type shall be selected from the HC Asset
Management approved list (see Appendix A).
14.9
Un-vented Hot Water Storage Units
14.9.1 The Contractor shall only install this type of equipment where specified by the
Employers Representative.
14.9.2 The Contractor shall install equipment of this type with following specific attributes
 Water Authority approved system
 Standard - BS 7206.
 Duty
Hot water capacity
Gas Ins Spec/25



- BS 7206 (between 15L and 500L) (litres) 120L,150L &200L
Water supply pressure
- BS 7206 (less than 12 bar) (bar) 2.5
Maximum operating pressure
- Classification to BS 7206, Table 3,Type 3, 3 bar.
Heating system
- Indirect.
Construction to BS 7206
- Copper storage cylinders (Cu).
Installation
- Install in accordance with manufacturer's instructions and BS 6700 and
Building Regulation G3
.
14.9.3 Manufacturer, make, model and type shall be selected from the HC Asset
Management approved list (see Appendix A).
14.10 Water Meters
14.10.1
The Contractor shall only install water meters where specified and instructed
by the Employers Representative.
14.10.2
The incoming main to the isolating street valve and water meter shall be
provided by local Water Authority.
14.10.3 Water meter shall be located and positioned so that they can be read by the building
occupants without the need for means of access to height or special tools (grates
and covers)
14.10.4 Meters fitted by the Contractor shall have a facility for remote monitoring
14.10.5 Meter standard - BS ISO 7858-1.
15.0 Natural Gas
15.1
Natural Gas – General Requirements
15.1.1 The contractor shall provide gas installations supplying up to a maximum of16
m3/hour (U16 meters). All works shall be undertaken in full conjunction with the
current Gas Safety (Installation and Use) Regulations and IGE/ UP/1B.
15.2
System Objectives
15.2.1 Each premise shall be provided with a network registered gas meter and associated
distribution pipe work to serve all appliances.
15.2.2 The Contractor shall design, install, test and commission internal system.
15.2.3 Working drawings shall be approved prior to installation by the Employers
Representative.
15.3
Gas Pipe Work Particular Requirements
Gas Ins Spec/26
15.3.1 The sizing of the installation pipe work shall be determined from the maximum gas
rate of the appliances to be connected, regard being given to the likelihood of
future extensions. The minimum size pipe work running/connecting to the boiler
shall be no less than 22mm.
15.3.2 Where gas cooker points are indicated a suitably sized bayonet connector
(with back plate elbow) shall be provided.
15.3.3 All redundant gas pipe work services shall be removed and plugged and
capped; this includes all “dead-legs”.
15.3.4 If the works involve the removal and replacement of the tenants owned cooker, the
Contractor shall first visually inspect the cooker and test in position to ensure its safe
use and condition. If the cookers position is re-located, the contractor shall test the
cooker upon re-location and ensure the cooker is adequately restrained (e.g. suitable
chain).
15.3.5 Prior to starting works the contractor must check that the existing meters and
gas supplies are adequate for the works to be carried out.
15.3.6 Where adequately sized gas mains and meters exist no alteration to these are
required unless instructed by the Employers Representative.
15.3.7 Where new gas supplies are required in floor voids, ducts or beneath wooden
floors, they shall be run in mild steel tube unless otherwise specified.
15.3.8 Where new gas supplies are to be fitted in copper tube above floor level, all fittings
shall be of the capillary type and the final connection must be of compression
or union type.
15.3.9 No self-cleaning fluxes shall be used on gas pipe work.
15.3.10 Where a gas appliance has no means of gas isolation; a suitable isolating valve
must be installed adjacent to the gas appliance.
15.3.11 No gas supplies are to be run in unventilated voids.
15.3.12 Where the Contractor finds existing gas carcasses are installed in the floor screed
they must report this to the Employers Representative to approve replacement.
15.3.13 All gas pipe work installed underground, below internal floors and in service ducts
shall be heavy grade black or galvanized steel suitably wrapped and protected.
15.3.14 All gas pipe work shall be pressure tested to industry standard procedures and
certified
16.0 Pipe Work and Pipe Work Fittings
16.1
General Requirements
16.1.1 Manufacturer, make, model and type shall be selected from the HC M Asset
Management approved list (see appendix A).
Gas Ins Spec/27
16.1.2 All pipe work and fittings shall be selected and installed to comply with BS
6891:1988 and the current HSC recommendations, including the completion
certification.
16.1.3 All heating distribution pipe work shall be a minimum size of 15mm with maximum
load of 5kW.
16.1.4 Pipe work size to be calculated to achieve zero velocity noise
16.1.5 All new heating pipe work to be preferably installed exposed at low level or installed
below floorboards.
16.2
Plastic Pipes and Fittings
16.2.1 Plastic pipes and fittings shall be to BS 7291
16.2.2 Application - all WC overflows Tank warning and overflow to atmosphere.
16.2.3 Plastic pipe work to be Kite mark certified, UKWFBS, chlorinated polyvinyl chloride
(PVC-C), W classification and solvent cement jointed
16.3
Copper Pipe Work and Fittings
16.3.1 Copper pipe shall be to BS EN 1057 and kite mark certified, R250 half hard (table X)
with an uncoated finish. The pipe shall be non- arsenical and guaranteed free from
carbonaceous film
16.3.2 Compression fittings shall be to EN1254 – (formerly BS 864), kite marked and
dezincifiable resistant
16.3.3 Capillary fittings shall be to EN1254-1 to 4 (formerly BS 864), kite marked, solder ring
manufacture, dezincifiable resistant
16.4
Stop Valves
16.4.1 Stop valves shall be ball type
16.4.2 Application - Isolating valves fitted to boiler and cylinder, all connections to plant &
tanks, all final connections to draw-offs.
16.4.3 All valves shall be full bore and full flow
16.4.4 Valves shall be bronze or DZR copper alloy body; chrome or nickel plated sphere
with compression ends to BS EN 1254-2, or BS 864-2, lever operated on all
appliances & equipment but screwdriver operated on final connection to taps &
similar outlets.
16.5
Check Valves
16.5.1 Check valves shall be swing check type
Gas Ins Spec/28
16.5.2 Application – Double Check Valves (DCV) on mains connection after inlet stop cock
and boiler feed valved flexible connection.
16.6
Pressure Reducing Valves
16.6.1 Pressure reducing valves shall be integral sensor type with control spring and hand
wheel, integral sensor with an alphanumeric pressure set-point indicator and locking
facility.
16.7
Radiator Valves
16.7.1 Radiator Valves shall be to BS 2767
16.7.2 Material - bronze or brass body type 4.
Pattern - Angle or straight valves to suit application.
Ends - Compression joints to BS EN 1254-2, or BS 864-2.
Finish - Chromium plated.
16.8
Drain Cocks
16.8.1 Drain cocks shall be fitted to all low points in heating circuits
16.8.2 Drain cocks shall be, where approved by the Employers Representative
Throughway gland cock type incorporating Bronze or DZR copper alloy body
threaded male to BS 21.
Tapered plug with square shank for loose lever.
Bolted gland
Chain and blank cap screwed on hand tight
Outlet to accept loose hose union
Screw-down cock type to BS 2879 Type 1, incorporating Bronze or DZR copper
alloy body threaded male to BS 21
Screw down plug with square shank for loose lever
Serrated outlet to accept hose pipe, fixed or union pattern.
16.9
Pressure Relief Valves (sealed systems only)
16.9.1 If not already an integral part of the boiler, pressure relief valves specified by the
boiler manufacturer shall be fitted as close to the appliances on the flow pipe by a
horizontal or a vertically upward connection (as specified within the manufacturer’s
instructions). Only pressure relief valves set to operate at 3 bar or in
accordance with the manufacturer's instructions shall be used. They shall be so
positioned or any discharge pipe so arranged that discharge of water or steam from
the valve will not create a hazard to occupants of the premises or public, cause
any damage to electrical components, wiring or the appliance via the flue pipe.
The pressure relief valve pipe work must fall away from the valve to a safe visible
point of discharge.
16.10 Pressure Vessels (sealed systems only)
Gas Ins Spec/29
16.10.1
If not already an integral part of the boiler, a remote pressure vessel
will need to be installed. The size and position of the vessel within the
heating system must be in accordance with the manufactures instructions. In
certain situations, in addition to the pressure vessel installed within the boiler, an
additional vessel(s) may be required to accommodate the systems pressure
expansion requirement. This will need to be ascertained at the design stage and
be in accordance with the manufacturers’ instructions.
16.11 Pressure Gauges
16.11.1
Pressure gauges covering at least the range 0-4 Bar with visible increments
of not less than 0.25 Bar shall be fitted to the system in a visible position close to the
point of filling the system. A separate gauge shall be fitted where remote filling points
are out of sight of system boilers on all sealed systems.
17.0 Pipe Work Installation Standards
17.1
Appearance
17.1.1 All exposed pipe runs shall present a neat appearance, parallel with other pipe or
service runs and building structure, subject to gradients for draining or venting.
17.1.2 All vertical pipes shall be plumb or follow the building line.
17.2
Isolation and Regulation
17.2.1 The Contractor shall provide valves, cocks and stop taps for isolation and/or
regulation
 Where shown on drawings.
 On mains to isolate major sections of distribution
 The base of all risers and drops except in cases where one item of
apparatus only is served which has its own local valve or stop tap.
 At points of pipe connection of all items of apparatus and equipment except
where the item could conveniently be isolated or regulated by valves
provided for other adjacent items.
17.3
Spacing of Pipe Work
17.3.1 The Contractor shall space pipe runs in relation to one another, other services runs
and building structure, allow for thermal insulation and ensure adequate space for
access to pipe joints, etc.
17.3.2 The minimum clearances to pipe or pipe insulation shall be:FROM
MINIMUM CLEARANCE (mm)
Wall
25
Ceiling
50
Floor
150
Other pipes
25
Electrical cables, conduit, switchgear, etc. 150
17.4
Gradients
Gas Ins Spec/30
17.4.1 The Contractor shall install pipe work with gradients to allow drainage and air
release. Pipe work shall be run so that air is expelled through radiator or suitably site
manual air vents.
17.4.2 The Contractor shall provide a means of venting the pipe system at all high points.
17.5
Expansion and Contraction
17.5.1 The Contractor shall provide supports and fixings to accommodate pipe
movement caused by the thermal changes. Isolate pipes from structure to prevent
noise or abrasion due to thermal movement / changes in direction.
17.6
Bends, Springs and Offsets
17.6.1 The Contractor shall machine bend pipe work and ensure that machine guides and
formers are smooth and clean, free from any scores, or other damage. Deformed
bends will not be accepted.
17.7
Pipes through Walls and Floors
17.7.1 The Contractor shall enclose pipes passing through building elements, (walls, floors,
partitions, etc.) concentrically within purpose made sleeves. Services passing
through ANY wall shall be sleeved.
17.7.2 Pipe Sleeves shall be cut from material that is the same as the pipe and shall be one
or two sizes larger than pipe.
17.7.3 The pipe sleeve shall not be used as a means of support
17.7.4 The Contractor shall fire stop the space between the pipe and the sleeve
17.8
Temporary Plugs and Caps
17.8.1 The Contractor shall seal all open ends as installation proceeds by metal,
plastic or wooden plugs or caps, to prevent ingress of foreign matter.
17.9
Making Capillary Joints for Copper Pipe Work
Preparation
Ensure that plain ends are cut square. Ream out bore at plain ends to full bore size.
Clean plain ends with fine steel wool.
Making and sealing
Use specified flux ensuring no excess material used. Make joint in accordance with
manufacturer's instructions. Clean off traces of flux when joint is completed. Protect
building fabric from heat when forming joints.
Polyethylene sheathed pipe
Follow manufacturer’s recommendations to avoid damage to plastic coating. Make
good with PVC tape of matching colour.
17.10 Making Compression Joints for Copper Pipe Work
Gas Ins Spec/31
Preparation
Ensure that plain ends are cut square. Ream out bore at plain ends to full bore
size.
Clean plain ends with fine steel wool or fine sandpaper. Then if using:
Type 'A' fitting - no further preparation.
Type ‘B’ fitting – in accordance with manufacturer’s instructions
Making and Sealing
In accordance with fitting manufacturer's instructions
17.11 Pipe Rings and Clips
17.11.1
The Contractor shall select type according to the application and material
compatibility. All brackets and clips shall be of closed front design and securely fixed
in position.
17.12 Pipe Supports
17.12.1
The Contractor shall install supports and accessories for equipment,
appliances or ancillary fitments in pipe runs, so that no undue strain is imposed upon
pipes.
17.12.2
The Contractor shall ensure that materials used for supports are compatible
with pipeline materials.
17.12.3Pipeline supports shall be installed to the following tabulated standard
Pipe Bore (mm)
Nominal
15
22
28 and above
Maximum Support Spacing (mm)
Horizontal
Vertical
1200
1800
1400
2100
1800
2400
18.0 Low Temperature Hot Water Heating
18.1
Contract Requirement
18.1.1 The Contractor shall install complete or partial systems consequent to the condition
survey and the instructions of the Employers Representative to BS 5449
18.2
General Requirements
18.2.1
The Contractor shall install systems that generally consist of room sealed
system wall hung boilers with integral pumps, radiators/natural convectors, HWS
quick heat up cylinders and controls
18.3
Design Parameters
18.3.1 The Contractor shall meet all CIBSE recommendations and Building Regulations and
maintain room temperatures as listed below with an ambient outside temperature
of -3 Degrees Celsius with system flow and return temperatures of:
Gas Ins Spec/32
 70 to 50 Degrees Celsius within a condensing (Range Rated) boiler arrangement.
 Where a boiler is retained and radiators are renewed – radiator should be sized
for delta T of 20 Degrees Celsius (70 to 50)
All sized to provide heating in each room to maintain the following temperatures.
Location
Temperature (Degrees Celsius)
Lounge
Dining Room
Bedrooms
Hall
Bathroom
Toilets / WC
Kitchens
21
21
21
18
23
18
18
Air Changes per
Hour
1.5
1.5
1
1.5
4
2
4
18.3.2 Air change rates for rooms with open flue appliances are to be increased
accordingly.
18.3.3 Allowances for mechanical extract fans shall be considered and applied in the air
change rate allowances.
18.3.4 The following U values may be used for calculating loads, with the CIBSE Guides
and Building Regulations providing authoritative point of reference for methods of
calculation:
 Existing dwellings with 335mm solid walls @ 1.7 U value,
 Existing single glazed windows @ 5.6 U value,
 Existing double glazed windows @ 3.0 U value,
 Refurbished insulated roof @ 0.35 U value,
18.3.5 When requested by the Employers Representative, the Contractor shall be required
to prove a U Value. The Contractors calculation shall show a clear build-up of the
laminar elements of the structure being considered and the breakdown of R
(Resistance) i.e. L/K, thickness of material (length) and the co-efficient thermal
conductivity.
18.3.6 The Contractor shall allow for within the calculations any modifications proposed
to the structure under the main body of the works, for example, the renewal of
windows. An additional allowance shall be added to room loads for the possibility of
adjacent void / vacant properties. This shall be based on a 50% on the adjacent
properties being void/vacant at any one time – with a 10 Degree Celsius delta
Temperature.
18.3.7 Special Needs Residents
The Contractor shall allow, when instructed by the Employer Representative, for
calculations to take into account occupants known to be registered disabled or
elderly. In this instance the room temperature is to be raised by 3 Degrees Celsius
higher i.e. where premises are specifically identified as sheltered housing or similar.
Gas Ins Spec/33
18.4
Domestic Boilers
18.4.1 Boiler and pump units shall be sized to handle calculated heating load plus 10% to
20% depending on fabric type (combination boiler outputs shall be sized to ensure
adequate secondary hot water flow rates are achieved).
18.4.2 Combination and non-condensing boilers will only be installed when approved and
instructed by the Employers Representative.
18.4.3 Boilers shall be complete with circulating pump, by-pass valve, expansion vessel,
pressure relief valve, programmer, pressure gauge and temperature indication of the
fanned flue type, mounted on wall frame.
18.4.4. Where combination boilers have been instructed to be installed – they shall be of a
minimum rating of 28 kW providing a minimum hot water flow rate of 11.5 litres per
minute at a temperature difference of 35ºC).
18.4.5 To comply with the Building Regulations 2010, Approved Document part ‘L1’
amendment, all replacement boilers are to be SEDBUK Band ‘A’ units with
fully modulating, low Nox gas burners selected from the HC Asset Management
“Main Approved List of Appliances”. This will only contain appliances with a
SEDBUK band ‘A’ rating.
18.4.6 After chemical treatment is carried out samples are to be taken and sent for
independent testing as detailed under the cleaning and flushing procedures. The
boilers serial and model numbers and the date of accepted commissioning shall be
recorded on the treatment certificate and Benchmark booklet.
18.4.7 Burner condensate shall discharge into polythene pipe work, trapped tundish
and then connected to an adjacent waste pipe. All waste pipe-work shall be in
polythene tubing. All existing copper and lead waste pipe-work shall be removed and
replaced as part of the Works.
18.4.8 Where the removal of condensate is difficult, the installation of a suitable
condensate pump may be fitted to overcome the problem. Condensate pumps may
only be fitted with prior approval from the Employers Representative.
18.4.9 Where condense pipe needs to be run externally the pipe should be no less than
35mm in thickness to compensate for winter conditions. This should though in all
cases be avoided where possible.
18.4.10
If the boiler pressure gauge cannot be viewed from the system filling
point, a suitably sized and rated pressure gauge shall be installed which can be
viewed from the filling point.
18.5
Radiator Pipe work
18.5.1 All radiators shall be fitted with TRV’s on the flow connection and matching Lock
Shield Valves (LSV) on the return connection. Replacement or renewal of existing
TRV’s shall include the renewal of the LSV’s.
Gas Ins Spec/34
18.5.2 Pipe work shall be run so that air is expelled through radiator or suitably
sited manual air vents. Pipe work should generally be surface mounted to ease with
maintenance and repair and follow the contours of the room at low level. Where pipe
work has to transgress upwards to circumvent obstructions such as a door, any
inverted pipe work should be fitted with a manual air vent to aid the bleeding of the
system during filling and testing.
18.5.3 Where pipe work is installed under the floor, this shall be through floor joists on
suitable pads of insect and vermin proof material between the pipe and fabric to
minimise noise
18.5.4 Solid joists and studs up to 250mm in depth can be notched or drilled subject to the
written permission of the Employers Representative
18.5.5. Pipe work under floorboards shall be protected by metal plate.
18.5.6 In dwellings with known elderly or registered disabled occupants low level exposed
pipe work shall be encased within pre-formed, pre-finished casings
18.5.7 Un-insulated pipe work routed and secured to prevent contact with electrical cables.
18.5.8 Where pipe work in installed in solid concrete floors, removable cover pipe ducts, as
agreed by the Employers Representative shall be used, with pipe work insulated.
18.6
Radiators
18.6.1 A 10% margin shall be added to the radiator output selections (“intermittent usage”)
and the resultant output shall be used to calculate the pipe work sizing.
18.6.2 The correct pipe size shall be calculated and installed to achieve negligible velocity
noise etc. within the heating and hot water system (e.g. below 1.5 m/s).
18.6.3 Radiators shall be selected against the appropriate system design temperatures (as
per section 18.3). This shall also apply to the selection and sizing of HWS storage
cylinders where applicable.
18.6.4 The sizing & selection of the radiator located in the same room as the “controlling
room thermostat” shall be restricted to a limiting margin to ensure the resultant output
is below that of all the other radiators fitted with TRV sets – this will therefore result in
this radiator achieving maximum output once all other TRV’s are satisfied (the
system shall also be hydraulically balanced to suit). All TRV heads shall be removed
when balancing the system.
18.6.5 Radiators shall be manufactured and rated in accordance with BS EN 442.
18.6.6 Radiators shall be sited on external walls and under/central to the windows where
possible and span the width of the window. Where this is not possible and radiators
are to be sited on internal/adjacent walls they must be as close as possible to the
external wall. Any deviation from this will require the written approval of the
Employers Representative. Where exiting radiators are to be replaced and are
not in the above locations – the contractor shall allow for relocating these
radiators and modifying the connecting pipe work to suit.
Gas Ins Spec/35
18.6.7 All radiators shall be fitted with a minimum space of 150mm between floor and the
bottom edge of the radiator, and 100mm from any pipe case to the bottom edge of
the radiator.
18.6.8 No radiator valve spacers shall be permitted; all replacement radiators shall be repiped as necessary.
18.6.9 Bed-sit dwellings shall have at least 2 radiators in the main room, in the living and
sleeping zones.
18.6.10
Any room exceeding 5 metres in length or with a volume greater than 40 M³
or with dual aspect shall have more than one radiator fitted to give an even
distribution of heat to that space
18.6.11
Radiators shall be of steel panel construction, either single, double or
triple panel and single, double or triple convector to suit the output required
and be supported on approved fixing brackets. Connections to all radiators
shall be bottom opposite end with air release valves and plugs in the top tapings.
18.6.12
Manufacturer, make, model and type shall be selected from the HC
Asset Management approved list (see Appendices A).
18.6.13 Supply and install on the wall behind every radiator, radiator reflective insulation
panels.
18.6.14
Reflecting insulation panel material shall be vacuum-formed metallic coated
PVC sheet, with a density of 0.3 to 0.4 kg/m2. It shall be fire resistant to Class 1
surface spread of flame to BS476 Part 7 1971, Section 2 and self-extinguishing. Its
toxicity must be safe to use where accessible to children as determined in tests in
accordance with draft EEC document N71.The material must not become brittle
in use, and the metallisation shall not deteriorate or become detached during
normal use over a reasonable period of time. The profile shall be saw-toothed and
shall be such that a minimum of the area of the panel remains in contact with
the wall.
18.6.15
The reflecting panels shall be secured against the wall behind each
radiator as per the manufacturers recommendations using 12mm wide doublesided tape and UPVC bond adhesive as supplied and recommended by
manufacturer/supplier. The walls must be clean and clear of debris etc. before fixing.
The panels must be sized to cover the whole are behind the radiator with the
exception of 50mm at the top and both sides.
18.6.16
The Contractor shall note that 300mm flexible valve connectors may be fitted
only with the approval with the Employers Representative.
18.6.17
Radiators shall be installed in each room in each dwelling, sized to match the
fabric heat loss and physical space, preferably positioned under/central to the
windows to offset down drafts and assist convection to minimise the risk of
condensation. Where it is not practical/possible to site a radiator beneath a
window, the radiator should be sited on an adjacent wall, as close as possible
to the external wall.
Gas Ins Spec/36
18.6.18
Where residents refuse to have a radiator sited in a particular position
(either as part of a new installation or a retro-fit installation) written confirmation,
signed by the resident, shall be obtained, countersigned by the Employers
Representative and kept on file as part of the O&M manuals. The written
confirmation should also record the agreed position of the radiator.
18.6.19
No single radiators in excess of 3kW shall be installed
18.6.20
Where wall space is restricted in the kitchen and/or bathroom and approval is
given by the Employers Representative, the contractor may install wall mounted
(hydraulic) fan convector unit heaters at high level with remote on/off control
thermostats (refer section 18.10 for specification).
18.6.21
Kick board heaters can be installed in kitchens were wall space is
restricted and where approval is given by the Employers Representative.
18.6.22
With the exception of bathroom radiators, kick board heaters, fan convector
heaters and rooms with the boiler control thermostat, all radiators are to be fitted
with thermostatic flow control valves (TRV's) and lock-shield return valves (LSV).
18.6.23
Where a radiator is located in the same room as the controlling room
thermostat(s) the Contractor shall provide LSV’s on both the flow & return
connections of the main radiator in that space i.e. if a secondary radiator is
fitted within the same space that shall be provided with a TRV set of valves
18.6.24
The contractor shall allow for removing and re-fitting radiators once to permit
decorating
18.7
Control Requirements
18.7.1 All control equipment regarding Manufacturer, make, model and type shall be
selected from the HC Asset Management approved list (see Appendix A).
18.7.2 All control and power wiring and conduit work should be undertaken subject to the
relevant sections of the Works electrical specification.
18.7.3 Electrical isolation of the heating system is generally to be within the HWS
Storage vessel cupboard and is subject to the Employers Representative design
review and approval.
18.7.4 The preferred location for programmers/time-switch is adjacent to the boiler.
18.7.5 The system shall be designed to control via a HWS timer-switch (hot water)
and zoned programmable room thermostat (heating). As per the HRC HC6, CHeSS
Best Practice and the current TACMA Controls Guidance document.
18.7.6 Where instructed by the Employers Representative the system shall be
designed to control via a programmer. The programmer shall provide easily
adjustable time settings to provide once, twice, constant or off positions for
heating and hot water separately. The programmer must incorporate a provision
of a service interval shut off mechanism that can be adjusted to suit the service
Gas Ins Spec/37
programme, this to be installed non-enabled unless otherwise instructed by the
Employers Representative. The programmer shall be sited in an easily accessible
position, usually adjacent to the boiler location.
18.7.7 Elderly, registered disabled and visually impaired persons shall have the option
of a mechanical programmer or the electronic type suitable for their individual needs
to be agreed by the Employers Representative.
18.7.8 Programmable room thermostats and standard room thermostats shall be of
the heat anticipation (accelerator) type with a neutral electrical connection and
shall be sited in a position agreed by the Contract Administrator 1.5 metres from
floor level. In the case of programmable Room Thermostat Control (RTC), this shall
be the only means of time control for the heating unless the property is over 150 M²
and has multiple zoned heating. In such circumstances the hot water shall have a
localised separate time control.
18.7.9 In all cases where a combination boiler is fitted, a programmable room
thermostat shall be installed to provide the heating systems time and air
temperature control.
18.7.10
HWS storage cylinders shall be fitted with suitably positioned strap-on
cylinder thermostats set at 60ºC. If the HWS storage cylinder is incorporates a
suitably located thermostat pocket, this pocket is to be utilised with a suitable pocket
type immersion thermostat, again set at 60ºC.
18.7.11
The system heating and hot water thermostats shall control the
operation of a single, suitably sized, 2-port motorised valves (5 wire model,
including end-switching) or three port diverting valve (3 wire model, in case of
hot water priority design). In all cases the control valves shall be of ‘motor open and
spring return’ manufacture.
18.7.12
Where a wiring centre is required, it must be a ‘purpose made’ unit,
compatible with all the equipment and controls installed within the system. The wiring
centre shall incorporate an easy to follow wiring diagram, preferably embossed
upon its casing/cover during its manufacturer. The wiring centre shall be sited
in a position suitable to allow for future maintenance, generally within the HWS
storage cylinder cupboard.
18.7.13
If not already incorporated within the boiler, a suitably sized and rated
pressure by-pass valve shall be installed within the systems pipe network. This valve
shall be installed prior to the control valves and between the flow and return pipe
work.
18.7.14
Where a condensing boiler is instructed and installed, the boiler shall be
controlled via an outside weather compensation unit with a direct link to the boiler
burner modulation. This type of control shall only be installed if the correct or
suitable sensor position i.e. North or Northwest wall can be achieved.
18.8
Chimneys and Flues
Gas Ins Spec/38
18.8.1 All new heating system and replacement boilers shall be installed with
manufacturer’s standard twin, vertical or horizontal room sealed flue systems,
complete with supports, terminals, roof flashing plates and wall sleeve collars.
18.8.2 For replacement boiler units, the Contractor shall remove existing flue
arrangement and make good the hole to match the existing finish, then drill new
flue hole in fabric.to achieve a uniform and neat final finish of the flue penetration
18.8.3 Where any gas appliance uses an existing chimney the Contractor shall line the
chimney in accordance with British Standards
18.8.4 The Contractor shall ensure that the catchment area recess is impervious to any
escaping flue gases. Sealing plates shall be fitted with airtight joints to all flues.
Where problems have occurred with the catchment areas being damaged, where
specifically instructed by the Employers Representative a prefabricated flue box may
be fitted.
18.8.5 Where flexible flue linings are to be fitted they shall be of a single continuous length,
joints in the running length are not permitted. The minimum size shall be125 mm
diameter.
18.8.6 Before flue linings are installed an accredited chimney sweep shall clean the chimney
and remove all deposits.
18.8.7 Where flue terminal metal guards are required, only approved metal guards shall be
fitted.
18.8.8 The Contractor shall install boiler flues strictly in accordance with manufacturer's
instructions and recommendations, BS 4543, BS EN 1859 and BS 7566-3.
18.8.9 For boiler replacement only situation where the existing boiler is located internally
within the dwelling, the Contractor shall in all instances endeavour to relocate the
boiler closer to or on an external wall/roof position. Should this not be possible,
routing of the flues in ceiling voids, ducts or boxed in sections may be undertaken
with the express permission of the Employers Representative and compliance to the
current guidance provided by the HSE and Gas Safe Register
18.8.10
As a minimum, all flues in ceiling voids, ducts or boxed in sections should
contain removal inspection panels at every flue joint and transition point. Position and
size of inspection panels should be sought from the current guidance provided by
HSE and Gas Safe Register.
18.8.11
Flues should be fully self-supporting on manufacturer’s provided brackets and
shall not use the ceiling or duct fabric for any support.
18.8.12
Carbon Monoxide detectors shall be installed in all rooms that the flues are
located and pass through. Care should be taken in installing CO detectors in
bathrooms and the manufacture’s guidance should be sought to ensure that the
alarm is not accidentally triggered by steam or condensation. If no suitable CO
detector can be installed within the bathroom area, then this should be installed
directly outside of the bathroom. The Contractor shall identify the exact positions of
CO detectors in the hand-over pack and the resident handbooks
Gas Ins Spec/39
18.9
Use of existing flue
18.9.1 The Contractor shall clean and check for obstructions. Perform core ball and smoke
tests notifying appropriate persons before carrying out tests.
18.10 Fan Convector Heaters
18.10.1
Fan convectors shall be manufactured and rated in accordance with BS EN
442 and BS 4856.
18.10.2
The Contractor shall only install fan convectors when
Employers Representative
instructed
by the
18.10.3
The Contractor shall install wall mouthed (hydraulic) Fan Convector Unit
Heaters at high level with remote On/Off Control Stats. In Kitchens and/or Bathrooms
19.0 General Ventilation
19.1
General Ventilation Requirements
19.1.1 All bathrooms and kitchens provided with extract fans to control condensation
(see Appendix A for specification).
19.2
Grilles/diffusers
19.2.1 Living rooms with stand-by gas fires to be provided with permanent fresh air
inlets either via part of the window replacement or via a purpose made air-brick/core
vent. Permanent fresh air inlets shall be sized in compliance with the relevant British
Standard and manufacturer’s instructions.
20.0 Electrical Supply
20.1
Electrical Installations General Requirements
20.1.1 All electrical installations shall comply with the requirements of the Works Electrical
Specification issued as a separate document by the Employer
20.1.2 Field control wiring for heating systems shall be undertaken by the heating
contractor, using suitably qualified, experienced and competent operatives.
20.1.3 The entire heating installation shall be tested in accordance with the current edition of
the Electrical Regulations and Building Regulation 2010, Approved Document Part P.
20.1.4 Electrical connections between all electrical components shall be in hard wiring
and mechanically protected. Where applicable the final connection to an electrical
component will be via a flexible cable connection, with consideration to the use of
heat resistant flex where needed.
20.1.5 Wireless communication of control components shall only be allowed with the
express permission of the Employers Representative
Gas Ins Spec/40
20.1.6 All cables and flexible cable connections shall be sized in accordance with BS 7671
20.1.7 Wiring diagrams for the installation of control wiring shall be provided by the
Contractor and shall be in accordance with the manufacturer’s recommendations of
all component parts. The control wiring shall be functional to the exact
purposes it is serving. All wiring diagrams must be agreed with the Employers
Representative before any installation works commence.
20.1.8 The circuit wiring for controls shall consist of surface fixed heavy gauge (HIP)
UPVC plastic conduit, with single core low-smoke-and-fume (LSF) or lowsmoke-zero-halogen (LS0H) cable with copper conductors enclosed, each final
circuit shall incorporate a separate circuit protective conductor (CPC) colour green
and yellow.
21.0 Thermal Insulation
21.1
Thermal Insulations to Pipelines
21.1.1 All pipe work-installed external of the dwellings in the roof, floor voids, ducts etc. shall
be insulated using phenolic insulation or approved equivalent.
21.1.2 All pipe work within the dwelling not used as heating surface, e.g. installed
behind casings and under floor voids and within service cupboard e.g. cylinder
cupboards, boiler cupboards etc. shall be insulated.
21.1.3 Thermal Installation thickness according to pipe location or routing should follow the
recommendations set out with Building Regulations 2010, Approved Document Part
L.
21.1.4 The Contractor shall use closed cell nitrile rubber elastomeric preformed flexible
sections, all to be of Class ‘O’ rating, 22mm, 15mm pipe 13mm thickness, roof
voids prone to freezing shall be 25mm thickness.
21.1.5 Manufacturer and type shall be
approved list (see Appendices A).
21.2
selected
from
the
HC Asset Management
Thermal Insulation Workmanship
21.2.1 The Contractor shall not apply thermal insulation until installation has been fully
tested and all joints proved sound.
21.2.2 The Contractor shall ensure that all materials are kept dry, insulating each unit
separately.
21.2.3 The Contractor shall ensure clearance between insulated pipes.
21.2.4 The Contractor shall ensure that where protection is applied to insulation, the joints
fall blind side and that all joints are made to shed water. All joints to be sealed with
suitable manufacture approved, joint sealant, adhesive and tape where appropriate.
Gas Ins Spec/41
21.2.5 The Contractor shall install insulation, facings, coatings and protection strictly in
accordance with manufacturer's instructions, neatly finish joints, corners, edges and
overlaps and are parallel to circumferential and longitudinal joints.
21.2.6 Insulation of feed and expansion cistern shall allow removal of access covers.
21.2.7 Insulation shall not to be glued directly onto pipe work.
21.2.8 For insulation with canvas finish the Contractor shall apply two coats of class "O"
polymer solution.
22.0 Testing and Commissioning of Mechanical Services
22.1
Pressure Testing
22.1.1 The Contractor shall pressure test concealed or buried pipe work before any
permanent covering is applied.
22.1.2 The Contractor shall complete pressure testing before applying thermal insulation.
22.1.3 The Contractor shall thoroughly flush out whole systems, fill systems, vent all
air from systems and check for leaks, repair any leaks and re-check using potable
water
21.1.4 The Contractor shall pressure test at twice the working pressure for a minimum period
of one hour. The Contractor shall not exceed the pressure limits of any manufactured
item of equipment in the system where twice working pressure exceeds this limit
22.2
External Cleaning of Pipe Work
22.2.1 The Contractor shall remove flux, cement, and any debris and clean all pipe work
and brackets.
22.3
System Flushing and Chemical Cleaning:
22.3.1 All new systems, replacement boiler and major system component (e.g. radiators,
cylinders etc.) replacements shall be cleaned and any sludge or debris removed
22.3.2 Complete systems shall be cleaned via the addition of a proprietary chemical cleaner
and in strict accordance with cleaner and boiler manufacturer’s instructions. Upon
completion of the system clean a suitable chemical inhibitor shall be added to the
system, in accordance with the chemical inhibitor and the boiler manufacturer’s
instructions. The Contractor shall take into account the boiler manufacturer’s
requirements for cleaning that are part of the extended warranty provision.
22.3.3 The Contractor shall provide and issue a Chemical Cleaning and Dosing Certificate
as part of the hand-over pack.
22.3.4 The Contractor shall only use a system inhibitor that has been approved by the
Employers Representative.
Gas Ins Spec/42
22.3.5 The Contractor shall note that where a partial system replacement is completed a
magnetite water treatment device (See Appendix A) is to added following the
complete system clean. This is be recorded as an asset to ensure that HC adds it a
servicing regime.
22.4
Disinfection of Pipe Work
22.4.1 After flushing process for hot and cold water systems (not including heating) the
Contractor shall carry out disinfection in accordance with BS6700 and Health and
Safety Executive ACoP and Guidance - Legionnaires' disease - control of legionella
bacteria in water systems (L8).
22.4.2 The Contractor shall submit samples to registered laboratory for microbiological
analysis and report.
22.4.3 The Contractor shall carry out commissioning of installations in accordance with the
procedures, checks and tolerances given in the CIBSE Commissioning Codes and
BSRIA Application Guides.
22.5
Commissioning of Heating Systems
22.5.1 The Contractor shall commission the boiler in strict accordance with the
manufacturer’s instructions using competent and experienced operatives
22.5.2 Following commissioning of the boiler and heating system, the Contractor will be
required to take water samples from the heating system and send them for
independent analysis & certification. The results (only “pass” analysis results will be
accepted) will then be provided by the Contractor to the Employers
Representative.
22.5.3 The Contractor shall balance system to give approximately equal return temperatures
from all radiators.
22.5.4 The Contractor shall temporarily remove ALL thermostatic control heads on ALL
valves during the commissioning period and proportional balance the system using
the LSV balancing valves etc.
22.5.5 The Contractor shall carry out commissioning of installations in accordance with the
procedures, checks and tolerances given in the CIBSE Commissioning Codes and
BSRIA Application Guides.
22.6
Gas Safety Commissioning
22.6.1 The Contractor shall provide a Gas Safety Inspection document in accordance with
section 4.13 & 4.14.
23.0 Handover of Systems – Physical Condition
Gas Ins Spec/43
23.1
The Contractor shall hand over the completed works in ‘as new’ condition. The
installation and associated component parts shall be entirely free of any marks,
dents, scuffs, scratches, dust, dirt or debris and in a permanent operational state
unless agreed otherwise. The Contractor and the Employers Representative shall
record on the handover documentation the date and time of handover. The
signatories shall be clearly identified on the handover documentation
Appendices
A - Standard Schedule of HC Approved Appliance Product List
Gas Ins Spec/44
Appendix A
Approved Product List for Domestic Heating & Hot Water
Systems
Equipment
Manufacturer
Model
Condensing Boilers (SEDBUK-A)
Standard/Regular Boiler
Worcester Bosch
Greenstar
System Boiler
Worcester Bosch
Greenstar System Boiler
Combination Boiler
Worcester Bosch
Greenstar Classic CDi
IMPORTANT NOTE: Alternative Manufacturer’s boiler may be used to provide technical solution or other constraint that cannot be
met with the products listed above. Requests must be made to HC Asset Management for Approval at Design Stage and before installing
alternative product. Installation must only progress with alternative product when confirmation has been approved by Howard Cottage
Asset Management and Instructed by the Howard Cottage CA.
Electric Fires
R. Etchells & Sons Ltd
Tiffany Model
Main Heating
Multipoint BF (Balanced Flue)
Water Heaters
Multipoint
Multipoint FF (Fan Flue)
Hot Water Storage Vessels
Hot Water Cylinders (Vented)
Albion
Direct & Indirect High Recovery
Range
Direct & Indirect High Recovery
Gas Ins Spec/45
Plumbing Units *
Combination Units *
Thermal Stores *
Hot Water Cylinders (Un-vented) **
Albion
AquaPak
Range
Kernel
Albion
Direct & Indirect High Recovery
Range
Fortic
Albion
Mainsflow
Range
FlowMax
Albion
Ultrasteel –Direct & Indirect
Range
Tribune – Direct & Indirect
Domestic Heating Controls
Timer Control Units
Honeywell
Motorised Valves
Danfoss
Room Thermostat Control
Drayton
HW Cylinder Thermostat Control
Automatic Bypass Valves
Domestic Pumps
Circulating Pumps
Grunfoss
Domestic Radiators
Radiators
Barlo
Gas Ins Spec/46
Round Top
TRV’s
LSV’s
Honeywell
VT117E
Pegler
Terrier & Belmont
Pegler
Terrier & Belmont
Myson
Matchmaster & Full Flow
Armstrong
Armaflex
NMC
Insul-Tube
Pipework
Insulation
Pipe Clips
Talon
Important Note: All Clips must be of the closed type, no open type clips to be installed or used.
Expansion Vessels
CH Expansion Vessels
Flamco
Flexicon
Water Treatment
System Chemical Cleaner
Fernox
F3, F5 and DS40
System Inhibitor
Fernox
F1 and MB1
Magnetite Remover
Adey
Adey MagnaClean Professional
Shock Arresters
Varem
Model R1016828
Flue Guards
Gas Ins Spec/47
Boiler Terminal Guards
TFC Group
Circular
Rectangular
Smoke Detectors
Aico
Hard wired smoke detector.
Carbon Monoxide Detectors
Fire Angel
Carbon Monoxide Alarm 7yr
Life
Extractor Fan
Envirovent
Filterless Low Voltage
IMPORTANT NOTE:
* These Products can only be considered at Design Stage or Installation Stage with Approval of Howard Cottage Asset Management and
Instructed by CA.
** These Products should only be considered when all other options have been exhausted and must not form part of any initial design or
solution. These products can only be installed with the express permission and authority of Howard Cottage Asset Management.
Gas Ins Spec/48

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