Microgeneration Installation Standard: MIS

Transcription

1 Microgeneration Installation Standard: MIS REQUIREMENTS FOR CONTRACTORS UNDERTAKING THE DESIGN, SUPPLY, INSTALLATION, SET TO WORK, COMMISSIONING AND HANDOVER OF A HEATING SYSTEM CONTAINING AN ELECTRICITY LED MICRO- COGENERATION PACKAGE Issue 2.0 This Microgeneration Installation Standard is the property of Department of Energy and Climate Change (DECC), 3 Whitehall Place, London, SW1A 2HH. DECC 2009

2 This document was prepared by the Microgeneration Certification Scheme Working Group 9 Micro-CHP systems. This document has been approved by the Steering Group of the Microgeneration Certification Scheme. REVISION OF S Installation Standards will be revised by issue of revised editions or amendments. Details will be posted on the website at Technical or other changes which affect the requirements for the approval or certification of the product or service will result in a new issue. Minor or administrative changes (e.g. corrections of spelling and typographical errors, changes to address and copyright details, the addition of notes for clarification etc.) may be made as amendments. The issue number will be given in decimal format with the integer part giving the issue number and the fractional part giving the number of amendments (e.g. Issue 3.2 indicates that the document is at Issue 3 with 2 amendments). Users of this standard should ensure that they possess the latest issue and all amendments. Page 2 of 32

3 TABLE OF CONTENTS FOREWORD SCOPE DEFINITIONS REQUIREMENTS FOR THE CERTIFICATED CONTRACTOR Capability Quality management system Sub contracting Consumer code of practice DESIGN AND INSTALLATION, SET TO WORK, COMMISSIONING, HANDOVER AND EQUIPMENT REQUIREMENTS Regulations Design and installation Set to Work & Commissioning Handover Equipment COMPETENCE OF STAFF REGIONAL OFFICES PUBLICATIONS REFERRED TO APPENDIX A: QUALIFICATIONS OF STAFF APPENDIX B: ENVIRONMENTAL PERFORMANCE APPENDIX C: DOMESTIC HOT WATER ONLY METHODOLOGY AMENDMENTS ISSUED SINCE PUBLICATION Page 3 of 32

4 FOREWORD This document identifies the evaluation and assessment practices undertaken by certification bodies of the Microgeneration Certification Scheme (MCS) for the purposes of approval and listing of contractors undertaking the design, supply, installation, set to work, commissioning and handover of a heating system containing a micro-cogeneration package. The listing and approval is based on evidence acceptable to the certification body: that the contractor has staff, processes and systems in place to ensure that the system or service delivered will meet the requirements of this standard And on: periodic audits of the Contractor including testing as appropriate; and compliance with the contract for the MCS listing and approval including agreement to rectify faults as appropriate This standard shall be used in conjunction with document MCS 001 (see Ref. [7.1]). NOTES:- This Installation Standard makes use of the terms must, shall and should when prescribing certain requirements and procedures. In the context of this document: The term must identifies a requirement by law at the time of publication The term shall prescribes a requirement or procedure that is intended to be complied with in full and without deviation The term should prescribes a requirement or procedure that is intended to be complied with unless reasonable justification can be given Compliance with this Installation Standard does not of itself confer immunity from legal obligations. The Steering Group welcomes comments of a technical or editorial nature and these should be addressed to the Secretary at mcs@gemserv.com Listed products and services appear at The objective of Government's Micro-generation strategy is to create conditions under which Micro-generation becomes a realistic alternative or supplementary energy generation source for the householder, for the community and for small businesses. Page 4 of 32

5 1. SCOPE This standard specifies the requirements of the Microgeneration Certification Scheme (MCS) for the approval and listing of Contractors undertaking the design, supply, installation, set to work, commissioning and handover of a heating system containing a micro-cogeneration package. The micro-cogeneration packages covered by this standard are those described in the MCS Product Certification Scheme requirements MCS 015 (see Ref. [7.2]) 2. DEFINITIONS Co-generated heat The co-generated heat recovered left after system losses. Commissioning Contract Contractor Design Handover Installation The activities to ensure that the installed system operates within the boundaries and conditions of the design and the product manufacturers' claims. A written undertaking for the design, supply, installation, set to work, commissioning and handover of a heating system containing a microcogeneration package. An individual, body corporate or body incorporate, applying for or holding certification for the services detailed in the Scope, Clause 1, above. The formulation of a written plan including a specific list of products and fixings to form a completed heating system containing a defined electricity-led micro-cogeneration unit or package installation in a dwelling. The point in a Contract where commissioning and certification of the system have been satisfactorily completed to the Contract specification so enabling the installation to be formally handed over to the client. The activities associated with placement and fixing of a heating system containing an electricity-led micro-cogeneration package. Page 5 of 32

6 Set to work Sub-contract The activities necessary to make the heating system containing an electricity-led micro-cogeneration unit or package system function as a completed system. A written contract between a certificated contractor and another Firm for supply of products and services in connection with the fulfilment of a Contract. Page 6 of 32

7 3. REQUIREMENTS FOR THE CERTIFICATED CONTRACTOR 3.1 CAPABILITY The Contractor shall have the capability to undertake the design, supply, installation, set to work, commissioning and handover of the heating system containing the microcogeneration unit or package. Where Contractors do not engage in the design or supply of such systems, but work solely as an installer for a client who has already commissioned a system design; then the Contractor shall be competent to review and verify that the design will meet the design requirements set out in this scheme document and this should be recorded. 3.2 QUALITY MANAGEMENT SYSTEM Contractors shall operate a satisfactory quality management system which meets the additional requirements set out in the scheme document MCS SUB CONTRACTING In installations for private customers, any work within the scope of the scheme not undertaken by employees of the Contractor shall be managed through a formal subcontract agreement between the two parties in accordance with the policies and procedures employed by the certificated Contractor. These procedures shall ensure that the subcontractor undertakes the work in accordance with the requirements of this standard. In other situations (for example new build, or for commercial customers), it is permissible for the physical installation, setting to work and commissioning to be undertaken by others (i.e. not subcontracted to the Contractor) provided that: A contract between the Contractor and the commercial client details obligations on the client to include that evidence of skills and training of those employed by the client to do elements of work not undertaken by the Contractor are to be made available to the Contractor to ensure that the competence requirements of this standard are met and that access to the site for training and supervision in accordance with the following sections is agreed in advance The certificated Contractor provides additional product-specific training for those undertaking the work not undertaken by the certificated Contractor. Page 7 of 32

8 3.3.3 The certificated Contractor assesses a sample number of installations under the contract which is not less than the square root of the number of installations rounded up to the nearest whole number (e.g. a new build site of 50 installations then a minimum of 8 are assessed) The certificated Contractor assumes responsibility at handover that the installation is in full compliance with the standard. 3.4 CONSUMER CODE OF PRACTICE The Contractor shall be a member of and shall comply with, a code of practice (consumer code), which is relevant to the scope of their business in the Microgeneration sector and which is approved by the Office of Fair Trading (OFT), (e.g. REAL Assurance Scheme Consumer Code {see Ref. [7.4]}). Page 8 of 32

9 4. DESIGN AND INSTALLATION, SET TO WORK, COMMISSIONING, HANDOVER AND EQUIPMENT REQUIREMENTS 4.1 REGULATIONS All applicable regulations and directives must be met in full. It should be noted that regulations that must be applied may be different in England and Wales, Scotland and Northern Ireland. Some guidance on applicable regulations is given in the guidance document MCS 002 (see Ref. [7.5]). This guidance is not necessarily exhaustive and may change from time to time. Certificated contractors shall ensure they have a system to identify all applicable regulations and changes to them. All work, and working practices, must be in compliance with all relevant health and safety regulations and a risk assessment shall be conducted before any work on site is commenced. 4.2 DESIGN AND INSTALLATION The areas of competence relevant to the design and installation of electricity-led microcogeneration package systems in dwellings are included in Clause 5. The following principles shall be met when selecting, designing, specifying and installing such systems The environmental performance of the micro-cogeneration unit or package shall be equal or better than would be achieved by a boiler using the same fuel and grid supplied electricity. This shall be determined either by the method set out in Annex 1 of MCS 015 (for hot water only systems) or in Appendix B of this document (for heating systems) The design of the installation shall ensure that it complies with the following fundamental assumptions: a) The micro-cogeneration package is a standalone electricity led product system for the dwelling. b) Either water heating service throughout the year is the sole thermal function or it is acting as a boiler substitute and producing at least 50% of the annual heating and hot water demand; Page 9 of 32

10 c) The package is controlled by electric demand (i.e. it is electricity-led ); d) Heat is never wasted; and e) Electricity is never wasted, and any that is not used in the dwelling is always exported to the grid The design of the micro-cogeneration unit or package system shall be in compliance with the micro-cogeneration unit or package manufacturer s specification and shall be clearly documented so that such compliance may be demonstrated The micro-cogeneration unit or package system shall be installed such that all the manufacturer s instructions are followed The micro-cogeneration unit or package shall be connected to the domestic electrical installation (in parallel with the mains supply) by following the appropriate guidance contained in the Guide prepared by the Electrical Safety Council Connecting a microgeneration system to a domestic or similar electrical installation (in parallel with the mains supply) (see Ref. [7.9]) a) For new build the Contractor shall provide evidence of consultation and compliance with the requirements of the designers and installers of the building s energy system regarding specification and performance to ensure the correct and efficient operation of the system as a whole. This shall cover the selection of a micro-cogeneration package of appropriate output for the building, and the design of hot water and/or heat distribution systems and controls compatible with efficient operation. b) When replacing an existing heating system the Contractor shall provide evidence that the micro-cogeneration unit or package and associated components selected is of appropriate output for the building, (and/or hot water system if applicable), and that the design of the heat distribution systems and controls is compatible with efficient operation of the package and the system as a whole. 4.3 SET TO WORK & COMMISSIONING The micro-cogeneration package system shall be commissioned according to the manufacturer s requirements. Page 10 of 32

11 4.4 HANDOVER Contractors shall provide the client with a comprehensive document pack and that pack should contain at least: The system maintenance requirements and the maintenance services available; The micro-cogeneration or package manufacturer s User and Installation and Service Instructions; A certificate signed by the contractor containing at least the following: - a statement confirming that the micro-cogeneration package system installation meets the requirements of this standard; - Client name and address; - Site address (if different); - Contractors name, address etc.; - List of key components installed; and - A description of the system performance including those parameters applicable to the specific installation listed in All MCS Installations shall be registered to the MCS Licensee through the MCS Installation Database. A certificate shall be obtained from the MCS Installation Database for each installation showing that the installation has been registered with the scheme and shall be provided to the customer no later than 10 working days after the date of commissioning the system; on provision of the certificate the customer shall be instructed to include it within the handover pack. The generation of the certificate shall be undertaken in full compliance with the terms and conditions of use of the MCS Installation Database 1 and the registration of the system on the MCS installation database shall only be undertaken after the system has been fully installed and commissioned. A per installation fee is levied on installers for each registration added to the database. Details of any such fee will be advised from time to time through MCS Certification Bodies. 1 The terms and conditions of use can be found on the MCS Installation Database website. Page 11 of 32

12 4.5 EQUIPMENT When making installations in accordance with this standard the micro-cogeneration package used in installations shall be listed under the MCS ( All micro-cogeneration packages that are installed within the European Union must be CE marked in compliance with the relevant European Directives. These are listed in MCS COMPETENCE OF STAFF All personnel employed by, or sub-contracted to, the Contractor shall be able to demonstrate that they are trained and competent in the disciplines and skills, appropriate to the activities required for their role, in accordance with this standard. Complete records of training and competence skills of personnel shall be maintained by the certificated contractor, in particular: Design staff, carrying out full conceptual design, shall be able to demonstrate a thorough knowledge of the technologies involved and the interaction of associated technologies; All personnel engaged in the actual installation are expected to have technical knowledge and installation skills, to install components and equipment within the designed system, in accordance with all appropriate codes of practice, manufacturer s specifications and regulations; and All personnel engaged in the final inspection, commissioning, or repair shall have a comprehensive technical knowledge of the products, interfacing services and structures to complete the specified processes. Examples of qualifications that may be suitable for satisfying the training requirements are listed in Appendix A. Page 12 of 32

13 Note: Due to the current development of the Sector Skills Agreement and the review in progress of the National Occupational Standards for this technology, the indicated suggested scope in the Appendix A, may change. For personnel employed in the installation of micro-cogeneration packages assessments of training and competence will cover the following underpinning knowledge areas: Health and Safety knowledge and awareness including risk assessments; Energy conservation including the requirements of the Building Regulations Schedule 1 Part L for new and existing buildings; Assessment of the suitability of an electricity-led micro-cogeneration package system for the building and the efficient operation of its heating system (and hot water system if applicable); Calculation of building heating requirements (including heat losses and the effects of insulation); After-sales service and warranty; Awareness of different electricity tariffs; Fault diagnosis; Performance data to be supplied; Commissioning; Environmental considerations e.g. minimising risk of nuisance from noise and combustion products; How electricity-led micro-cogeneration packages work principles and components; Electrical connections e.g. Competent Persons Scheme Electrical Safety in dwellings (see Ref. [7.10]); Plumbing connections e.g. Competent Persons Scheme Heating and Hot Water Service Systems (Dwellings) see Ref. [7.10]); and 6. REGIONAL OFFICES Where the Contractor wishes to design, install and commission under the Certification Scheme in regional offices, then these offices shall meet the requirements of this standard to be eligible for Certification. Page 13 of 32

14 7. PUBLICATIONS REFERRED TO In the following list reference to undated publications implies the latest edition and amendments: [7.1] MCS 001- Microgeneration Certification Scheme Installer certification scheme document - Available from [7.2] MCS 015 MCS 015 Microgeneration Certification Scheme - Product certification scheme requirements Electricity-led micro-cogeneration packages in dwellings - Available from [7.3] PAS 67: 2008 (updated July 2010) or the latest available version thereof Publicly Available Specification 67 - Laboratory tests to determine the heating and electrical performance of heat-led and electricity-led micro-cogeneration packages primarily intended for heating dwellings Available from BSI Customer Services Tel: +44 (0) [7.4] REAL Assurance Scheme Consumer Code see [7.5] MCS 002 Guidance on regulations and directives for Microgeneration installations - Available from [7.6] The Product Characteristics Database see [7.7] Method to evaluate the annual energy performance of micro-cogeneration heating systems in dwellings, 9 October Prepared for Sustainable Energy Policy Division, Defra, by John Hayton and Bruce Young, BRE. Available from: [7.8] SAP - The Government s Standard Assessment Procedure for Energy Rating of Dwellings 2009 Edition (or latest available version thereof) see: Page 14 of 32

15 [7.9] Connecting a microgeneration system to a domestic or similar electrical installation (in parallel with the mains supply) Best Practice Guide produced by the Electrical Safety Council see [7.10] Competent Persons Scheme Electrical Safety in dwellings AND Competent Persons Scheme Heating and Hot Water Service Systems (Dwellings) see nsschemes/existingcompetentperson/ [7.11] IGE/UP/3 Edition 2 Gas fuelled spark ignition and dual fuel engines see [7.12] ACS Module CGFE1 (Commercial Gas Fired Engines) [7.13] Domestic Heating Design Guide published by CIBSE Page 15 of 32

16 APPENDIX A: QUALIFICATIONS OF STAFF The following qualifications may be suitable to satisfy the training requirements detailed under Clause 5: Accreditation from a relevant training course relevance of the course would require independent verification. Membership of a relevant Competent Person Scheme relevance of the Competent Person Scheme would require independent verification. Micro-cogeneration package manufacturer s product training Would be product specific and require independent verification. Experience gained through a mentoring process would require independent verification. Demonstrable track record of successful installation would require independent verification. Page 16 of 32

17 APPENDIX B: ENVIRONMENTAL PERFORMANCE B.1 Standard of comparison B.1.1 The environmental performance of the micro-cogeneration package shall be evaluated and compared with that of a boiler using the same fuel and grid supplied electricity. B.1.2 For a micro-cogeneration package fuelled by natural gas, LPG, or oil, the standard for comparison shall be a boiler using the same fuel with a SEDBUK efficiency SEDBUK %/SEDBUK %, representative of good quality products readily available in the market. B.1.3 For a micro-cogeneration package not covered by B.1.2, the standard for comparison shall be a boiler using the same fuel and compliant with building regulations in respect of energy performance. B.1.4 For heating systems performance shall be established by either the SAP method described in B.2 or the HPER method described in B.3. For new dwellings, the SAP method shall be used. For existing dwellings in which the micro-cogeneration package is fuelled by natural gas, LPG, or oil, either the SAP method or the HPER method may be used. For existing dwellings in which the micro-cogeneration package uses a fuel other than natural gas, LPG, or oil, the SAP method shall be used. For hot water only systems performance shall be established in accordance with the methodology described in Appendix C. The carbon emissions value (C) shall be less than that of the reference boiler. Page 17 of 32

18 B.1.5 When communicated to the client, the estimate of performance shall be accompanied by the following disclaimer: The performance of Micro-cogeneration systems is difficult to predict with certainty due to the variability of customer expectations and usage and the subsequent effect on both heat demand and electricity supply and demand. This estimate is based upon the best available information but is given as guidance only and should not be considered as a guarantee. B.2 The SAP method B.2.1 The measure of environmental performance is the Dwelling CO 2 Emission Rate (DER), expressed in units of kgco 2 /m 2 /year to two decimal places, as calculated by the current version of SAP (see Ref [7.8]). SAP assessments of the dwelling in which the micro-cogeneration package is to be installed shall be carried out by a qualified SAP assessor. B.2.2 The SAP assessment shall be carried out for the particular micro-cogeneration package (identified by manufacturer, brand, and model name) to be installed. This can be done only if the micro-cogeneration package has previously been registered in the [Product Characteristics Database (Ref. [7.6])] If the micro-cogeneration package is not intended to provide hot water service then the specification of the alternative hot water system to be installed in the dwelling should be used in the SAP assessment. If the specification of the hot water system to be installed in the dwelling is not known then an electric resistance heated hot water storage system of suitable size must be assumed. The DER produced by the SAP assessment shall be recorded. B.2.3 A second SAP assessment for the same building shall be carried out in which a boiler is substituted for the micro-cogeneration package, using the same fuel. The energy performance of the boiler shall meet the requirements of B.1.2 or B.1.3 as appropriate. The boiler, which may be a combi boiler, shall also be specified as providing hot water service. No other changes to the data for the SAP assessment are allowed. The DER produced by SAP shall be recorded. Page 18 of 32

19 B.2.4 If the DER for the SAP assessment with the micro-cogeneration package is less than or equal to the DER for the SAP assessment with the boiler, the environmental performance of the micro-cogeneration package may be regarded as acceptable for the purpose of the MCS Scheme. B.3 The HPER method B.3.1 The measure of environmental performance is the Heating Plant CO 2 Emission Rate (HPER) in units of kgco 2 /kwh. Calculation of the HPER requires: the design heat loss of the dwelling in Watts the nominal rated heat output of the micro-cogeneration package in Watts (and confirmed by PAS-67 tests). the plant size ratio (as calculated in B.3.3) the independently verified micro-cogeneration package annual energy data provided by the manufacturer, obtained from test results in accordance with PAS- 67 (Ref. [7.3]) and the annual performance method (Ref. [7.7]). Note - it is preferable to take the annual energy data from the Product Characteristics Database (Ref. [7.6]) as this has been independently verified by the Product Characteristics Database administrator. B.3.2 The design heat loss of the dwelling shall be estimated using one of the following procedures: (i) The Whole House Boiler Sizing Method for houses and flats. This is an interactive calculator available under Recommended boiler size at (Ref. [7.6]). It is also available in printable form at - search for publication reference CE54. The design heat loss in Watts shall be taken as the sum of boxes E and F only (the additional figure for water heating in section 7 is ignored). (ii) The Domestic Heating Design Guide published by CIBSE (Ref [7.13]). The design heat loss is calculated on Worksheet 1 in Appendix F as the sum of the heat losses from each room, with final adjustments for exposed location, high ceilings, etc. Page 19 of 32

20 (iii) The HHIC Heat loss calculator & Radiator Selector published by the Heating and Hotwater Industry Council. The design heat loss is calculated as the sum of the heat losses from each room. See: B.3.3 The plant size ratio shall be calculated as the nominal rated heat output of the micro-cogeneration package in Watts divided by the design heat loss in Watts. B.3.4 The HPER shall be determined for the particular micro-cogeneration package and plant size ratio. This shall be done either by: (i) Calculation by the annual performance method (Ref. [7.7]), using data from PAS-67 tests; or (ii) Finding the HPER from the relevant entry in the Product Characteristics Database for the nearest plant size ratio below, and nearest plant size ratio above, and linear interpolating for the plant size ratio that applies to the particular dwelling in which the micro-cogeneration package is to be installed. B.3.5 To be acceptable for the purposes of the Microgeneration Certification Scheme the HPER shall be kgco 2 /kwh. Note: A HPER of kgco2/kwh is considered to be equivalent to a gas boiler of SEDBUK efficiency of 86% with a plant size ratio of 1.5 and has been derived from a combination of experimental and analytical work. This figure has been calculated using CO 2 emission figures for gas and electricity taken from Table 12 of SAP 2005, and is subject to change in future versions of SAP. Page 20 of 32

21 APPENDIX C: DOMESTIC HOT WATER ONLY METHODOLOGY NOTE: The domestic hot water test (DHW) below has been taken from the draft version of PAS67:2012 and may be subject to change DHW only test NOTE This test is applicable to RegPK, CombiPK and DHWPK Producing 100 litres/day of DHW NOTE 1: The test for the production of DHW alone is a test of the package for 24 hours to only include DHW tapping cycle in accordance with Table 12. NOTE 2: This part of PAS 67 is based upon European Commission Mandate M/324 [8] and its further interpretation within BS EN although test conditions are restricted to tapping cycle No 2. The test shall be carried out using the 23 tappings shown in Table 12 and with the energy equivalent of a total volume of litres at 60 ºC per day at a cold feed T coldwater 10±2 C. The laboratory shall use the minimum flow rates defined in Table 12 or a single higher flow rate of D which shall be 6 litres/min or higher, as declared by the manufacturer, whilst still meeting the temperature criteria as shown in Table 12. The flow rate used shall be recorded in Results Table 1 in Clause 13. NOTE 3: The definition of D in PAS 67 is slightly different to the definition in BS EN since it is expected that most micro-cogeneration packages will draw hot water from a store. The energy content of the DHW drawn off QDHW (MJ) is given by the formula: Page 21 of 32

22 Where: n is the number of tappings; d i is the water rate delivered in litre per minute; t i is the tapping duration of the useful water, in minutes; T i is the instantaneous temperature rise during the tapping, in Kelvin from a T coldwater of 10 ±2 C; spht water is the specific heat of water. NOTE 4: The above approach is consistent with BS EN Alternatively, QDHW can be evaluated using a real time calculation of instantaneous water enthalpies employing the approach embodied with The useful energy of the DHW drawn off is set against the values given in Table 12. All patterns define a 24 hour measurement cycle and within that cycle the starting times and the total energy content (in MJ equivalent of hot water tapped) of each tapping are defined. When these tapping rates result in a tapping period of less than 15 seconds the flow rate shall be decreased such that the tapping period is (15±1) s. If, by design of the appliance, the test cannot be carried out with these low flow rates, the minimum flow rate for the ignition of the appliance shall be taken. For each individual delivery, the allowable deviation is 0.018MJ for each litre/min of flow rate for that individual delivery (tapping). The required accuracy for each draw off is ±0.036MJ or ±2%, whichever is the greater, with a tolerance on the total energy content of the DHW drawn off, Q DHW of ±3 %. All data shall be measured and reported over the full 24 hours (see Clause 11). The minimum ΔT shall be met where required. Page 22 of 32

23 RegPK All times reported are EU tapping cycle clock times as indicated by Table 12. The micro-cogeneration package shall be filled with cold water and then started. The time at which it is started shall be noted as event 1. The time at which the cylinder thermostat ceases to call for heat shall be noted as event 2. Event 3 shall be noted as the earlier of: a) the time at which the micro-cogeneration package stops burning fuel after event 2; b) one hour after event 2. Immediately after event 3, a shower draw off shall be carried out as for i=23 in Table 12. The conclusion of the draw off shall be noted as event 4. The first test period of 24 hours shall commence at 2½ hours after event 4. This is time 00:00 for the purposes of the draw off schedule defined in Table 12. The test shall be carried out according to the demand schedule given in Table 12. T ContentDHW shall be calculated at 00:00 and 24:00 for the first test period. The 2nd test period of 24 hours shall immediately follow the first period. For the purposes of the draw off schedule defined in Table 12, time 00:00 of the second period is defined as time 24:00 of the first period. The 2nd 24 hour test shall be completed according to Table 12. T ContentDHW shall be calculated at 00:00 and 24:00 for the 2nd test period. At the option of the manufacturer, 3rd and subsequent 24 hour test periods may be carried out in like manner, each test period following the last with no interval between. The test shall be considered valid if the difference between T ContentDHW at 00:00 and 24:00 of the final 24 hour test period does not exceed 2K. The data for the final 24 hour test period shall be reported as the DHW test results in Results Table 3 in Clause 13 and a Page 23 of 32

24 chart of T ContentDHW vs. time for each 24 hour test period for reporting in accordance with Clause 13. NOTE In the event of difficulties in meeting the criteria it may be useful for the manufacturer to compare the records of the individual DHW tank temperatures during recovery following successive 21:30 shower draw-offs. It may be that the tank thermostat specified by the manufacturer has excessive differential. Table Cycle M324 Relevant table in PAS 67 MJ/day litres/day a b c Producing alternative quantities of DHW per day Subject to agreement between the manufacturer and the test laboratory the package may additionally be tested at other daily DHW demands as defined within EU Mandate M324 and BS EN A summary of the daily DHW demand for each tapping cycle is listed in this clause and also are shown in more detail in Tables 12, 12a, 12b and 12c. Products submitted within the category DHWPK (i.e. tested for DHW production alone) shall be tested according to at least three of the above draw off patterns (Table 12a being mandatory with the manufacturer selecting two of the other tapping cycles from the table above). NOTE: This is to allow accurate prediction of package performance under a range of conditions. The data shall be reported using additional sheets of Table 3 (for RegPK) and Table 4 (for CombiPK and DHWPK). Page 24 of 32

25 DHW test for CombiPK and DHWPK The micro-cogeneration package shall be filled with cold water and then started. A sufficient interval shall be allowed to elapse for any internal hot water store to be heated to the upper temperature limit at which it is controlled. If there is no visible indication of the time at which the micro-cogeneration package becomes ready to offer a full hot water delivery service then the advice of the manufacturer should be sought to establish an adequate heating up time. The micro-cogeneration package shall be operated to undertake a shower draw off as for i=23 in Table 12. The conclusion of the shower draw off shall be noted as event 1. The shower draw off as in Table 12 (i=23), is applicable only to the M324 tapping cycle 2 (which is the same as the Table 12) in the table in above. If different tapping cycles are requested by the manufacturer the initial draw is different for each cycle type, and event 1 shall be the last draw off from the previous day i.e. For Table 12a (cycle 1) = Large (1.890MJ), Table 12b (cycle 3) = Small (0.378 MJ) and Table 12c (cycle 4) = Bath (15.912MJ). The first test period of 24 hours shall commence at 2½ hours after event 1. This is time 00:00 for the purposes of the draw off schedule defined in Table 12. The test shall be carried out according to the demand schedule given in Table 12 or selected tapping cycle demand schedule as selected from The 2nd test period shall immediately follow the first period. For the purposes of the draw off schedule defined in Table 12, time 00:00 of the 2nd period is defined as of the first period. The second 24 hour test shall be completed according to Table 12 or selected tapping cycle demand schedule as selected from In the event of the temperature anywhere within the tank exceeding 95 C the package shall cease operation at least to such an extent that the transfer of heat from the microgeneration unit to the tank shall cease. a) Packages with a water content of less than 15 litres Page 25 of 32

26 The procedure detailed within shall be repeated for a third day. The test shall be considered valid if between 00:00 and 24:00 on the second day (penultimate day) and the same times on the third day (final day), none of the quantities of Q fuel, Q DHW, E out and E in differ by more than 2.5% (of the larger value) between the two days. If this difference is exceeded the tests may be repeated for a fourth day (an additional day). If the level of repeatability is still not within 2.5%, the micro-cogeneration package under test shall be considered incompatible with this test procedure and the DHW test results shall not be entered in Results Table 2 in Clause 13. b) Packages with a water content of greater than 15 litres The procedure detailed within shall be repeated for a third and successive days. The test shall be considered valid if all the following conditions are met: 1) between 00:00 and 24:00 on the second day (penultimate day) and the same times on the third day (final day), none of the individual quantities of Q fuel, Q DHW, E out and E in differ by more than 2.5% (of the larger value) between the two days. If this difference is exceeded the tests may be repeated for a fourth or further successive day. This process may be repeated until two days do not vary by more than 2.5%. NOTE: This requirement ensures no gross discrepancy in system heat content. 2) the instantaneous temperatures at the start and end of the first and last draw off's of the day do not vary by more than ±2.0 0 C C, between successive days. NOTE: Requirement ensures no gross temperature difference between the top of the tank on successive days. This requirement also ensures no gross change in tank stratification from day to day. 3) between 00:00 and 24:00 on the second day (penultimate day) and the same times (and at the same instantaneous fuel combustion rates) on the third day (final day), the temperature of the return (TprimretDHW) of any heat transfer fluid between the microgeneration unit and any heat store as determined within shall be within ±3 C. If this difference is exceeded the tests may be repeated for a 4th or further successive Page 26 of 32

27 day. This process may be repeated until two days do not vary by more than this figure. It is appreciated that even at equilibrium there could be slight differences in the timings of firing of the microgeneration unit between successive days; in this instance the similarity of rate of fuel combustion may take priority. NOTE: This requirement ensures no gross temperature difference between the bottom of tank on successive days nor the level of convective heat transfer to the tank contents. This effectively ensures that the tank contents are under comparable conditions. If these levels of repeatability are not demonstrated the micro-cogeneration package under test shall be considered incompatible with this test procedure and the DHW test results shall not be entered in Results Table 2 in Clause 13. NOTE: This test option allows mchp package manufacturers to test and place on the market a closely integrated bespoke system to optimise the performance of the mchp unit, hot water storage and optionally the production of central heating water. Page 27 of 32

28 Table 12 EU reference tapping cycle number 2 i hr:min start Energy (MJ) Type (ref M324) ΔT desired (K), to be achieved during tapping Minimum ΔT (K), = start of counting useful energy Flow rate for individual tapping, di (litre/min) 1 07: Small N/A : Shower N/A : Small N/A : Small N/A : Small N/A : Small N/A : Small N/A : Small N/A : Small N/A : Floor cleaning : Small N/A : Small N/A : Dish washing : Small N/A : Small N/A : Small N/A : Small N/A : Household Cleaning N/A : Household Cleaning N/A : Small N/A : Dish washing : Small N/A : Shower N/A 30 6 Total N/A = not applicable Page 28 of 32

29 Table 12a EU reference tapping cycle number 1 i hr:min start Energy (MJ) Type (ref M324) ΔT desired (K), to be achieved during tapping Minimum ΔT (K), = start of counting useful energy Flow rate for individual tapping, di (litre/min) 1 07: Small N/A : Small N/A : Small N/A : Small N/A : Small N/A : Small N/A : Dish washing : Small N/A : Household cleaning N/A : Dish washing : Large N/A 30 4 Total N/A = not applicable Page 29 of 32

30 Table 12b EU reference tapping cycle number 3 i hr.min start Energy (MJ) Type (ref M324) ΔT desired (K), to be achieved during tapping Minimum ΔT (K), = start of counting useful energy Flow rate for individual tapping, di (litre/min) 1 07: Small N/A : Shower N/A : Small N/A : Small N/A : Bath : Small N/A : Small N/A : Small N/A : Small N/A : Small N/A : Floor cleaning : Small N/A : Small N/A : Dish washing : Small N/A : Small N/A : Small N/A : Small N/A : Household cleaning N/A : Household cleaning N/A : Small N/A : Dish washing : Bath : Bath N/A 15 3 Total N/A = not applicable Page 30 of 32

31 Table 12c EU reference tapping cycle number 4 i hr.min start Energy (MJ) Type (ref M324) ΔT desired (K), to be achieved during tapping Minimum ΔT (K), = start of counting useful energy Flow rate for individual tapping, di (litre/min) 1 07: Small N/A : Shower N/A : Small N/A : Bath : Small N/A : Small N/A : Small N/A : Small N/A : Small N/A : Small N/A : Small N/A : Floor cleaning : Small N/A : Small N/A : Small N/A : Dish washing : Small N/A : Small N/A : Small N/A : Small N/A : Small N/A : Small N/A : Small N/A : Household cleaning N/A : Household cleaning N/A : Small N/A : Dish washing : Bath : Small N/A : Bath Total N/A = not applicable Page 31 of 32

32 AMENDMENTS ISSUED SINCE PUBLICATION Document Number: Amendment Details: Date: 1.0 First Issue 16/11/ Extension to include electricity-led microchp providing domestic heating 30/01/ Definition of cogenerated 25/05/2012 heat added. Updated references to read or latest available version thereof Updated boiler efficiency database to read product characteristics database Revision to 4.2 Design and Installation. Updated references in Section 7 Publications referred to and Appendix B Environmental Performance. Addition of Appendix C for domestic hot water test Page 32 of 32