Electronic Copy - RIBA Product Selector
Contents
1. gore 304 E 1 bar 5 t3 20 4 3 20 4 8 z 102 10 4 mixed water at 40 C mixed from 2 60 hot water at 60 C and 40 cold water at 10 C T T T T Q 10 20 30 40 50 O 10 20 30 40 50 60 flow available min at entry to system 1 flow rates shown apply to situations where the supply is capable of supplying an adequate dynamic pressure 70 8 bar 4 bar 3 bar 2 bar 1 bar 4 5 The data shown in Tables 3 and 4 of this Detail Sheet represent the results of tests carried out Table 3 Heating reheating and water draw off temperature by the BBA Slight variations in the results occur ith ch mah i Indirect heating with changes in the water mains supply pressure A B C D System Primary Heatup Percentage and Mean Reheating re flow time quantity heated to draw off time 5 Hot water storage and supply within 10 C of set temperature litres per temperature Hot water storage minute minutes 76 litres C minutes 5 1 The capacities of the system range are ONE ie oy pi ze Ch125 15 25 75 94 60 18 comparable with conventional systems see Cll45 15 27 74 107 60 21 Table 1 When heated to 60 C the system can C70 15 27 73 124 60 22 lv ZOY of the st TNR CI210 15 29 74 155 60 24 supply U o ot the storage capacity at the mean CI250 15 34 75 187 60 30 temperature given in Table 3 Cl300 15 41 72 216 60 36 Direct heating A B C D System Immersion2. pressure lt 7 bar volume of air gap lt 5 volume of water gt 95 cold feed open hot tap open water level drops to stage 1 level no cold water fed into cylinder water hot pressure 3 bar volume of air gap 5 volume of water 95 Table 2 labels General electrical controls 3 Manufacturer s name 4 Product code number 5 Unique serial number 6 The system is an unvented system Design Maximum water supply pressure bar 2 Operating pressure bar 3 Pressure control valve setting bar valve bar 5 Immersion heater Power voltage Type BS Length 6 Storage capacity litres 7 Weight of system full kg Safety warnings conditions l1 Installation to be carried out only by a competent person 2 The removal replacement o Limited in accordance with their instructions The BBA identification mark incorporating the number of this Certificate 2 The system uses BEAB British Electrotechnical Approvals Board approved 4 Expansion system relief via the combined temperature and pressure relief any component must be carried out only by a competent person using components supplied by Heatrae Sadia Heating 3 Any malfunction of the system such as that resulting in discharge of water to o any further use of the system 4 The installation o orthern Ireland Order 1978 where appropriate Installer details 1 Space for Nam
3. BOARD OF AGR MENT For technical or additional information tel 01923 670844 For information about Agr ment Certificate validity and scope tel Hotline 01923 662900 Electronic Copy BRITISH BOARD OF AGREMENT ASSESSMENT OF PRODUCTS FOR CONSTRUCTION Heatrae Sadia Heating Limited CI SIB 433 X Certificate No 95 3094 DETAIL SHEET 4 MEGAFLO INDIRECT UNVENTED HOT WATER STORAGE SYSTEM e HIS DETAIL SHEET RELATES TO THE MEGAFLO INDIRECT UNVENTED HOT WATER STORAGE SYSTEM WITH A RANGE OF CAPACITIES FROM 70 TO 300 LITRES A NOMINAL OPERATING PRESSURE OF 3 BAR AND FITTED WITH ONE OR TWO 3 kW IMMERSION HEATERS e The system is for use with mains or other suitable potable water supply pressures up to and including 12 bar e The system is for use with gas electric or oil fired boilers and a maximum primary pressure of 3 bar e Satisfactory outlet flow rates can only be achieved where the flow rate available at the entry to the system is adequate see section 5 e It is essential for reasons of safety and performance that the product is installed and maintained in accordance with the requirements of this Detail Sheet by a competent person see section 12 regarding Maintenance and section 15 for the definition of a competent person This Detail Sheet must be read in conjunction with the Front Sheet and Detail Sheet 1 which give Conditi
4. C outlet connection iting to BS 864 Part 2 1983 Drain valve to BS 2879 1980 1988 emperature of 65 C and cutout designed to operate when Tundish 22 mm compression inlet and 1 BSP female thread Hot water draw off 22 mm diameter stainless steel tube to BS 1449 Part 2 1983 grade 316 to suit compression A J cod feed p bit g 57 js isolating valve connection for balanced cold supply Wy Electronic Copy Figure 2 Expansion system system commissioning operating cycle air gap c aC uos cad cold cylinder at 1 bar illing cold feed open hot tap open as system fills water flows out of hot tap walter cold pressure O bar cold feed open hot tap closed water cold pressure bar volume of air gap 10 volume of water 90 stage cylinder at cold supply pressure cold feed open hot tap closed water cold pressure lt 3 bar max controlled by pressure control valve volume of air gap 5 volume of water 95 aC Bos all stage 2 stage 3 er water heated hot water drawn off to stage 1 level cold feed open hot tap closed water heated to 60 C and expands in cylinder cylinder air bubble compresses
5. 4 insulation to satisfactorily limit the energy loss from the stored water and meets the requirements described in the Building Regulations 1991 as amended 1994 England and Wales Section 3 2 of Approved Document L1 the Building Standards Scotland Regulations 1990 as amended Regulation 22 Standard J3 4 and Technical Booklet F Paragraph 3 3 of the Building Regulations Northern Ireland 1994 5 11 The heat loss of each system while maintaining the temperature of the stored water at 65 C is shown in Table 4 Table 4 Standing energy losses System ref Heat loss Energy loss maximum daily W kWh D70 76 1 82 D125 85 2 04 DD145 90 2 16 DD170 95 2 28 DD210 98 2 35 DD250 107 2 57 DD300 118 2 83 1 See section 4 5 2 These figures relate to a 45 C differential between the stored water and ambient temperature Connections 5 12 The system is designed to be connected to copper tube conforming to BS 2871 Part 1 1971 Tables X Y and Z using conventional plumbing fittings see Table 1 for details of connection sizes and threads The connections are of adequate size 6 Safety Excessive temperature Prevention of 79 3M explosion Safe discharge of hot water 6 1 The safety devices provided to ensure that the temperature of the stored water will not exceed 100 C and safeguard the operation of the system are a the combined temperature and pressure relief valve and b t
6. storage cylinder see Figure 3 Where balanced pressures are required the cold water draw off is connected as shown in Figure 3 using components supplied by Heatrae Sadia Heating Limited 17 2 The discharge pipe is connected to and from the tundish to a safe and visible termination point see section 16 2 The air gap at the tundish must remain clear 17 3 The appropriate electrical connections are made 18 Commissioning 18 1 The system is filled with water in the sequences set out in the Megatlo Installation Manual 18 2 When the commissioning instructions are followed an air gap at the top of the storage cylinder is formed see Figure 2 For the system to work safely it is important that this air gap is formed 18 3 The system is checked for watertightness The combined temperature and pressure relief valve is manually operated to ensure water discharge from the valve runs freely through the tundish to the discharge point The valve is visually checked to ensure that it re seats satisfactorily Heat is applied to the system and is allowed to reach normal working temperature The operation of the thermostat s is checked and an examination carried out to ensure that no water has discharged from the combined temperature and pressure relief valve during the heatup 18 4 On completion of the commissioning process the competent person completes the label attached to the system stating that the installation complies wi
7. undertaken by a competent person defined as one holding a current Registered Operative Identity Card for the installation of unvented domestic hot water storage systems issued by the Construction Industry Training Board CITB the Institute of Plumbing the Association of Installers of Unvented Hot Water Systems Scotland and Northern Ireland or an equivalent body 15 3 In Scotland it is the requirement of the deemed o satisty provision to Technical Standard P3 1 Unvented Hot Water Storage System for compliance with Regulation 28 of the Building Standards Scotland Regulations 1990 as amended that such systems be in the form of a proprietary unit or package which is the subject of a BBA Certificate The Standard contains no specific requirements for installers but the Certificates referred to state that installation must be undertaken by a competent person as defined in section 15 2 15 4 In Northern Ireland it is the requirement of Regulation P Deemed to satisfy provision for an unvented hot water storage system that systems with a capacity not greater than 500 litres and a heat input not greater than 45 kW be manufactured and installed in compliance with Certificates issued by the BBA under MOAT No 38 1986 Agr ment Eu will refer to a need for installation by a competent person as defined in section 15 2 16 Conditions The following conditions abstracted from the manufacturer s instructions must
8. E OF CAPACITIES FROM 70 TO 300 LITRES A NOMINAL OPERATING PRESSURE OF 3 BAR AND SUPPLIED WITH ONE TWO OR THREE 3 kW IMMERSION HEATERS e The system is for use with mains or other suitable potable water supply pressures up to and including 12 bar e Satisfactory outlet flow rates can only be achieved where the flow rate available at the entry to the system is adequate see section 5 e It is essential for reasons of safety and performance that the product is installed and maintained in accordance with the requirements of this Detail Sheet by a competent person see section 12 regarding Maintenance and section 15 for the definition of a competent person This Detail Sheet must be read in conjunction with the Front Sheet and Detail Sheet 1 which give Conditions of Certification and the product s position regarding the Building Regulations respectively 1 Description 1 1 The Megoflo Direct Unvented Hot Water Storage System is for use in domestic commercial and public buildings for connection to domestic hot and cold water services to BS 6700 1987 and comprises the components shown in Figure 1 The storage capacities and main dimensions are listed in Table 1 1 2 The system generally comprises a stainless steel storage cylinder supplied with one two or three immersion heaters The system is for free standing installation and connects to a cold feed supp
9. Electronic Copy Bis C 433 X Heatrae Sadia Heating Limited BRITISH Hurricane Way iri BOARD OF Norwich AGR MENT Norfolk NR6 6EA No 95 3094 ASSESSMENT OF PRODUCTS FOR CONSTRUCTON Tel 01603 424144 Fax 01603 409409 Designated by Government to issue MEGAFLO UNVENTED HOT WATER STORAGE SYSTEMS European Technical nn im Approvals Syst me d eau chaude sanitaire PP Heifiwasserbereiter Regulations Legislation and Byelaws e THIS CERTIFICATE REPLACES 1 The Building Regulations England and Wales CERTIFICATE NO 92 2743 a2 The Secretary of S E i ry of State has agreed with the British Board of Agr ment AND RELATES TO MEGAFLO b the aspects of performance to be used by the BBA in assessing the UNVENTED HOT WATER compliance of unvented hot water storage systems with the Building STORAGE SYSTEMS Regulations In the opinion of the BBA the position of Megaflo Unvented Hot e The systems are for use in Water Storage Systems under the Regulations if used in accordance with the domestic commercial and provisions of this Certificate is as stated in Detail Sheet 1 ee dba 2 The Building Standards Scotland Regulations BS 6700 1987 4 In the opinion of the BBA the position of Megaflo Unvented Hot 752 x Water Storage Systems under the Regulations if used in accordance e The systems are for connection A m R y with the provisions of this Certificate is as stated in Detail Sheet 1 to mains water sup
10. Heatup Percentage and Mean Reheating re heater time quantity heated to draw off time within 10 C of set temperature temperature kW minutes 76 litres fac minutes CL 7O 3 86 72 50 59 65 CL125 3 144 75 94 60 108 CL145 3 160 74 107 60 131 CL170 3 191 75 127 60 149 CL210 3 209 73 153 60 174 CL250 3 263 73 182 60 207 CL300 3 292 72 210 59 270 1 These heatup times assume a boiler of adequate output is connected to the system Primary flows of 15 litres per minute can normally be attained with a standard domestic circulating pump Flow rates 5 2 The flow rates achieved at the hot water draw off point will depend on all the normal factors including the layout of the pipework from the tap to the cylinder the cold water supply pressure and the flow rate available at the supply to the system 5 3 For design purposes the graphs in Figure 4 show the relationship between flow available mains supply pressure and the maximum hot water flow rate out of the system Flow characteristics shown in the graphs reflect the worst combination of cold water control components that may be installed see Detail Sheet 2 of this Certificate 5 4 The hot cold mixed flows are for draw off temperatures of 40 C assume 60 at 60 C and 40 at 10 C Heating re heating and hot water draw off temperature 5 5 The heatup and reheot times are comparable with conventional systems supplying hot water 5 6 The coil heat
11. ail Sheet 2 of this Certificate 5 4 The hot cold mixed flows are for draw off temperatures of 40 C assume 60 at 60 C and 4076 at 10 C Heating re heating and hot water draw off temperature 5 5 The heatup and reheat times are comparable with conventional systems supplying hot water 5 6 The immersion heater will heat the stored water from 15 C to 60 C in the time listed in column A of Table 3 5 7 The amount of water that can be drawn off within 10 C of the set temperature is listed in column B of Table 3 the mean temperature of 70 of the water drawn off immediately after reaching 60 C in column C and the time taken to re heat the stored water to 60 C in column D 4 Temperature control 5 8 The direct thermostat wired to the 5 immersion heater is satisfactory for controlling the temperature of the stored water Pressure control 5 9 The pressure control valve is satisfactory for controlling the pressure of the water supplied from the water mains or other suitable potable supply However during the heatup period from cold to 60 C the water expands and compresses the air gap at the top of the storage cylinder causing an increase in pressure to a maximum of 7 bar see Figure 2 Under failure conditions the combined temperature and pressure relief valve ensures the pressure will not exceed 10 bar Each storage cylinder is factory tested to 15 bar Insulation 5 10 The system is provided with adequate
12. al that the motorized valve supplied with the system is installed and is not substituted by any other motorized valve which may exist and be in service at the site of installation eg a motorized valve installed in a central heating circuit 17 Procedure Summary of installation procedure 17 1 The storage cylinder is located in position see the Megatlo Installation Manual and the plumbing connections made to the inlet and outlet pipes in the same manner as for a conventional storage cylinder except that the water supply pipe is taken directly from the mains or other suitable potable supply via the line strainer and cold water control valves ensuring the arrow markings on the components are pointing downstream to the cold water inlet of the storage cylinder see Figure 3 Where balanced pressures are required the cold water draw off is connected as shown in Figure 3 Electronic Co using components supplied by Heatrae Sadia Heating Limited 17 2 The discharge pipe is connected to and from the tundish to a safe and visible termination point see section 16 2 The air gap at the tundish must remain clear 17 3 The appropriate electrical connections are made 18 Commissioning 18 1 The system is filled with water in the sequences set out in the Megatlo Installation Manual 18 2 When the commissioning instructions are followed an air gap at the top of the storage cylinder is formed see Figure 2 For the system to work sa
13. arried out using the Megatlo Installation Manual by a competent person see section 15 of each system Detail Sheet or by Heatrae Sadia Heating Limited under their responsibility as the product manufacturer including that required by their warranty using components supplied by Heatrae Sadia Heating Limited Readers are advised to check the validity of this Detail Sheet by either referring to the Index of Current BBA Publications or contacting the BBA direct Telephone Hotline O1923 662900 Electronic Copy m BRITISH BOARD OF NT ASSESSMENT OF PRODUCTS FOR CONSTRUCTION On behalf of the British Board of Agr ment f _ Nets ea Date of Second issue 4th February 1997 Director Original Detail Sheet issued 22nd February 1995 This amended version includes changes to components list indirect thermal cut out and thermostat British Board of Agr ment n ee a IOS 44 P O Box No 195 Bucknalls Lane AN Fk information abod Agr ment Garston Watford Herts WD2 ZNG RITEN Certificate validity and scope tel Fax 01923 662133 1997 BBA Hotline 01923 662900 CI SIB Electronic Copy 433 X Certificate No 95 3094 DETAIL SHEET 3 Heatrae Sadia Heating Limited BRITISH BOARD OF AGREMENT ASSESSMENT OF PRODUCTS FOR CONSTRUCTION MEGAFLO DIRECT UNVENTED HOT WATER STORAGE SYSTEM e HIS DETAIL SHEET RELATES TO THE MEGAFLO DIRECT UNVENTED HOT WATER STORAGE SYSTEM WITH A RANG
14. aste of water The system is listed by the Water Byelaws Scheme 9 Watertightness The storage cylinder remains watertight at 1 5 times the design pressure ie factory tested to 15 bar 10 Noise The system is quiet in normal operation the flow of water being via conventional water pipe fittings and compares favourably with a vented hot water storage system 11 Physiological effects The insulation used is a conventional material It will not encourage vermin or bacteria and is not susceptible to damage from moisture 12 Maintenance 12 1 It is recommended that annually a competent person inspects and cleans the line strainer 12 2 The replacement or servicing of components must be carried out by a competent person using the Megatlo Installation Manual or by Heatrae Sadia Heating Limited under their responsibility as the product manufacturer including that required by their warranty using components supplied by Heatrae Sadia Heating Limited 12 3 The system may be drained through the drain valve 12 4 When the system is used in buildings subject to the Health and Safety at Work etc Act 1974 an inspection of the system must be carried out every six months 13 Site checks On site the following should be checked By the Client 1 The installer is a competent person by reference to his her identity card 2 The system being installed is BBA Certificated by reference to the label 3 That the i
15. be observed 1 The system is for connection to oil electric or gas fired boilers 2 The combined temperature and pressure relief valve tundish must be in a clearly visible position within 500 mm of the cylinder and in the same compartment as the cylinder The discharge pipe to and from the tundish must be of metal and laid to fall It must terminate at a visible safe place such as a gully where there is no risk of contact with the hot water by persons in or about the building Further details are given in the BBA Information No 33 1989 Unvented Hot Water Storage Systems Hot Water Discharges from Safety Devices BBA Requirements and Guidance 3 The system must be connected to a water supply with a pressure not exceeding 12 bar and of a quality supplied by a water undertaker under the Water Byelaws and Water Regulations as appropriate 4 The system is installed in locations similar to those for storage cylinders used in a conventional vented system or in other locations advantageous to the building designer see Table 1 for load weight of the system when full It is important to ensure there is adequate clearance for the removal of the immersion heater see Table 1 5 Electrical wiring must be carried out in accordance with the IEE Wiring Regulations The immersion heater circuit must be protected by a suitably rated fuse eg 13 A and an isolating switch with double pole disconnection 6 lt is essenti
16. competent person electrical safety effect on water quality and prevention of waste of water properties in relation to fire practicability and adequacy of maintenance requirements durability of materials used 20 Other investigations The manvfacturing and assembly process was examined including the methods adopted for quality control and details were obtained of the quality and composition of materials used Electronic Co BS 864 Capillary and compression tube fittings of copper and copper alloy Part 2 1983 Specification for capillary and compression fittings for copper tubes BS 1449 Steel plate sheet and strip Part 2 1983 Specification for stainless and heatresisting steel plate sheet and strip BS 2871 Specification lor copper and copper alloys Tubes Part 1 1971 Copper tubes for water gas and sanitation BS 2879 1980 1988 Specification for draining faps screw down pattern BS 3456 Specification for safety of household and similar electrical appliances Section 2 21 1972 Electric immersion heaters BS 3955 1986 Specification for electrical controls for household and similar general purposes BS 5449 1977 Code of practice for central heating for domestic premises Forced circulation hot water systems 6282 py with moving parts for the prevention of contamination of water by backflow Part 1 1982 Specification for check valves of nominal size up to and including DN 54 BS 6283 Safety and
17. control devices for use in hot water systems Part 3 1982 Specification for combined temperature and pressure relief valves for pressures up fo and including 10 bar Part 4 1982 Specification for drop tght pressure reducing valves of nominal size up to and including DIN 54 for supply pressures up to and including 12 bar BS 6700 1987 Specification for design installation testing and maintenance of services supplying water for domestic use within buildings and their curtilages BS 7671 1991 Requirements for electrical installations IEE Wiring Regulations Sixteenth edition MOAT No 38 1986 The assessment of unvented hot water storage systems and the approval and surveillance of installers Electronic Copy Electronic Copy p BRITISH BOARD OF AGREME ASSESSMENT OF PRODLCTS FOR CONSTRUCTION On behalf of the British Board of Agr ment Ko Hec et Date of issue 22nd February 1995 Director British Board of Agr ment P O Box No 195 Bucknalls Lane Garston Watford Herts WD2 ZNG Fax 01923 662133 Electronic Copy 1995 eZ BBA BRITISH BOARD OF AGREMENT For technical or additional information tel 01923 670844 For information about Agr ment Certificate validity and scope tel Hotline 01923 662900
18. d from damage 2 3 The system must be carefully handled and kept in the delivery carton until required for siting in position The weight of each system empty and full is stated in Table 1 and on the label attached to each oylinder 3 Labelling marking The system carries a label or labels bearing the information set out in Table 2 and is supplied with a comprehensive installation user manual Readers are advised to check that this Detail Sheet has not been withdrawn or superseded by a later issue by either referring to the Index of Current BBA Publications or contacting the BBA direct Telephone Hotline O 1923 662900 Electronic Copy Table 1 Storage capacities and dimensions Manufacturer s system reference D7O D125 DD145 DD170 DD210 DD250 DD300 DDD250 DDD300 water storage capacity litres at 1 bar 84 130 145 170 187 223 267 at 3 bar 92 140 155 182 199 236 283 cylinder size mm height 7 7 1023 1149 1306 1407 1659 1973 diameter 450 450 450 450 450 450 450 overall height 886 1192 1318 1475 1576 1828 2142 overall diameter 525 525 525 525 525 525 525 weight of unit kg emply 25 29 31 36 42 49 58 at 3 bar full operating 117 169 186 218 24 285 34 pressure capacity connection sizes mains water supply to 22 22 22 22 22 22 22 control valves mm control vlaves BSP inches 34 34 34 34 34 3A 3A temperature and pressure relief valve 34 34 34 34 34 3A 3A discharge BSP inches female immersion heater ra
19. d separately for fitting by the installer e The BBA has assessed each of the components as suitable for purpose This Detail Sheet must be read in conjunction with the Front Sheet and the relevant Detail Sheets Component Manuvfacturer supplier Setting Size and component number Line strainer Reliance Water Controls S75 3A Pressure control valve Honeywell DO7 3 bar 34 Desbordes 9BisFX 3 bar 34 Reliance Water Controls 312 3 bar 34 Check valve Reliance Water Controls SC75 22 mm Combined control valve set Reliance Water Valves 2014 expansion valve set at 8 bar Combined temperature and Flamco 90 C 10 bar 34 pressure relief valve Reliance 90 C 10 bar 34 Tundish Reliance Water Controls 22 mm to 1 Immersion heater Megaflo 90105151 134 BSP Direct non selfresetting Cotherm Type TUS 0228 77 to 83 C thermal cutout Direct thermostat Cotherm Type TUS 0228 10 to 70 C Indirect non self resetting Cotherm Type GTLHR 038 75 to 85 C thermal cutout Indirect thermostat Cotherm Type GTIH 3101 10 to 70 C Motorized valve Honeywell V4043 Danfoss DMV2C Sunvic SZV 2212 F t is essential on indirectly heated systems that the motorized valve supplied with the system is installed and is not substituted by any other motorized valve which may exist and be in service at the site of installation eg a motorized valve installed in a central heating circuit Note The replacement or servicing of any components must be c
20. d to a competent person after switching off the heat source and prior o any further use of the system the system is subject to approval under the Building Regulations Water Byelaws and Regulations the Health and Safety at Work etc Act 1974 where appropriate and the Health and Safety at Work orthern Ireland Order 1978 where appropriate Installer details 1 2 Space for a Name Address Telephone number Registration No declaration that installation has been in accordance with BBA Certificate o 95 3094 with space for the signature of the installer b c d Completion date e A The installer must meet the definition of a competent person as defined in section 15 2 4 General 4 1 The Megatlo Indirect Unvented Hot Water Storage System see Figure 3 has been assessed in accordance with MOAT No 38 1986 When used in accordance with this Detail Sheet the system will perform in a safe and satisfactory manner 4 2 The hot water system capacity etc should be selected in accordance with the recommendations of BS 6700 1987 to meet the demands made upon the installation The primary circuit pipework associated with indirect heating systems should be designed in accordance with BS 6700 1987 and BS 5449 1977 Particular consideration should be given fo the inclusion of a primary circuit by pass to prevent excessive pressure on the motorized valve and also safeguard against nuisance tri
21. e Address Telephone number Completion date Registration No aonga he tundish from the combined temperature and pressure relief valve to be reported to a competent person after switching off the heat source and prior the system is subject to approval under the Building Regulations Water Byelaws and Regulations the Health and Safety at Work elc Act 1974 where appropriate and the Health and Safety at Work 2 A declaration that installation has been in accordance with BBA Certificate o 95 3094 with space for the signature of the installer The installer must meet the definition of a competent person as defined in section 15 2 4 General 4 1 The Megatlo Direct Unvented Hot Water Storage System see Figure 3 has been assessed in accordance with MOAT No 38 1986 When used in accordance with this Detail Sheet the system will perform in a safe and satisfactory manner 4 2 The hot water system capacity etc should be selected in accordance with the recommendations of BS 6700 1987 to meet the demands made upon the installation 4 3 The pressure and flow available from the water mains should be obtained from the local water undertaker or by testing existing supplies to establish the likely performance of the system at peak periods 4 4 lt is essential for reasons of safety and performance that installation of the system is undertaken only by a competent person working in accordance with this Detail She
22. e compresses pressure lt 7 bar volume of air gap lt 5 volume of water gt 95 cold feed open hot tap open water level drops to stage 1 level no cold water fed into cylinder water hot pressure 3 bar volume of air gap 5 volume of water 95 Table 2 Labels General ONAN Safety warnings conditions 2 3 4 The installation ol The BBA identification mark incorporating the number of this Certificate The system uses BEAB British Electrotechnical Approvals Board approved electrical controls Manufacturer s name Product code number Unique serial number The system is an unvented system Design Maximum water supply pressure bar Operating pressure bar Pressure control valve setting bar Expansion system relief via the combined temperature and pressure relief valve bar Immersion heater Power voltage Type BS Length Storage capacity litres Weight of system full kg Maximum primary circuit pressure bar nstallation to be carried out only by a competent person The removal replacement of any component must be carried out only by a competent person using components supplied by Heatrae Sadia Heating Limited in accordance with their instructions Any malfunction of the system such as that resulting in discharge of water to he tundish from the combined temperature and pressure relief valve to be reporte
23. e to and from the tundish must be of metal and laid to fall It must terminate at a visible safe place such as a gully where there is no risk of contact with the hot water by persons in or about the building Further details are given in the BBA Information No 33 1989 Unvented Hot Water Storage Systems Hot Water Discharges from Satety Devices BBA Requirements and Guidance 3 The system is installed in locations similar to those for storage cylinders used in a conventional vented system or in other locations advantageous to the building designer see Table 1 for load weight of the system when tull It is important to ensure there is adequate clearance for the removal of the immersion heater see Table 1 4 OPT os must be carried out in accordance with the IEE Wiring Regulations The immersion heater circuit must be protected by a suitably rated fuse eg 13 A and an isolating switch with double pole disconnection 17 Procedure Summary of installation procedure 17 1 The storage cylinder is located in position see the Megatlo Installation Manual and the plumbing connections made to the inlet and outlet pipes in the same manner as for a conventional storage cylinder except that the water supply pipe is taken directly from the mains or other suitable potable supply via the line strainer and cold water control valves ensuring the arrow markings on the components are pointing downstream to the cold water inlet of the
24. et 4 5 The data shown in Tables 3 and 4 of this Detail Sheet represent the results of tests carried out by the BBA Slight variations in the results occur with changes in the water mains supply pressure Electronic Copy Figure 3 Schematic layout direct combined temperature and pressure relief valve cold water control valves hot drawoff m expansion valve pressure isolating control valve valve tundish cold feed immersion heater sirainet nonsselfresetting L d thermal cutout E and thermostat balanced pressure discharge pipe cold draw off io safe position see section 16 2 drain valve Figure 4 Flow rates flow available Z min at entry to system Notes static supply pressures of incoming water supply 70 7 hot cold mixed S bart ar 60 4 4 bar 3 bar E 2 bar 504 50 hot 8 bar T E S 4 bar 1 bar e NS 3 bar o 40 4 a E 2 bar e 5 304 i wos T 1 bar 5 S 20 4 E 20 4 8 c z 10 4 10 mixed water at 40 C mixed from c9 60 hot water at 60 C and 40 cold water at 10 C l O 10 20 30 40 50 O 10 20 30 40 50 60 70 flow available min at entry to system 1 flow rates shown apply to situations where the supply is capable of supplying an adequate dynamic pressure 2 the graph represents the results of tests carried out by the BBA 3 where static water supplies are less than 1 bar consult Heatrae Sadia Heating L
25. exchanger with a primary flow at 80 C 2 C or the 3 kW immersion heater will heat the stored water from 15 C to 60 C in the time listed in column A of Table 3 5 7 The amount of water that can be drawn off within 10 C of the set temperature is listed in column B of Table 3 the mean temperature of 70 of the water drawn off immediately after reaching 60 C in column C and the time taken to re heat the stored water to 60 C in column D Temperature control 5 8 The indirect thermostat supplied with 4 every system and connected via the wiring loom to the motorized valve provides adequate control of the stored hot water 5 9 The direct thermostat wired to the immersion heater is satisfactory for controlling the temperature of the stored water when this form of heating is used Pressure control 5 10 The pressure control valve is satisfactory for controlling the pressure of the water supplied trom the water mains or other suitable potable supply Electronic Copy However dufing the heatup period from cold to 60 C the water expands and compresses the air gap at the top of the storage cylinder causing an increase in pressure to a maximum of 7 bar see Figure 2 Under failure conditions the combined temperature and pressure relief valve ensures the pressure will not exceed 10 bar Each storage cylinder is factory tested to 15 bar Insulation 5 11 The system is provided with adequate 4 insulation to satisfactorily lim
26. fely it is important that this air gap is formed 18 3 The system is checked for watertightness The combined temperature and pressure relief valve is manually operated to ensure water discharge from the valve runs freely through the tundish to the discharge point The valve is visually checked to ensure that it re seats satisfactorily Heat is applied to the system and is allowed to reach normal working temperature The operation of the indirect and direct thermostats and motorized valve is checked and an examination carried out to ensure that no water has discharged from the combined temperature and pressure relief valve during the heatup 18 4 On completion of the commissioning process the competent person completes the label attached to the system stating that the installation complies with the Certificate see section 3 The following is a summary of the technical investigations carried out on the Megatlo Indirect Unvented Hot Water Storage System 19 Tests and investigations 19 1 Tests were carried out in accordance with MOAT No 38 1986 to determine capacity of storage cylinder dimensional accuracy mean supply temperature outlet flow rate at various supply flow rates and pressures time taken to heat to 60 C reheat time to 60 C standing energy loss adequacy of insulation watertightness resistance of the storage cylinder to an internal hydrostatic pressure of 1 5 times the design pressure 15 bar factor
27. ge pipework are correctly located and fitted 14 Durability The system is manufactured from durable materials and conventional plumbing components and will have a life equal to that expected of a vented system It may be necessary to replace some of the system components for example the immersion heater s thermostat s etc see section 12 2 and Detail Sheet 2 of this Certificate 15 The installer 15 1 It is essential for reasons of safety and performance that the installation commissioning and maintenance of the system is carried out by a person with suitable training and practical experience However the assessment of training arrangements and continuing competence of installers falls outside the scope of this Certificate 15 2 It is the view of the Department of the Environment and stated in its Approved Document G3 that to meet the requirements of the Building Regulations 1991 as amended 1994 England and Wales concerned with unvented Electronic Co hot water storage systems installations should be undertaken by a competent person defined as one holding a current Registered Operative Identity Card for the installation of unvented domestic hot water storage systems issued by the Construction Industry Training Board CITB the Institute of Plumbing the Association of Installers of Unvented Hot Water Systems Scotland and Northern Ireland or an equivalent body 15 3 In Scotland it is the requi
28. he non selFresetting thermal cutout fitted to the immersion heater 6 2 The system has a safety warning label attached to the storage cylinder bearing an explanation of the action to be taken in the case of any malfunction of the system It is essential that these instructions are followed 6 3 The system has adequate provision for safe disposal of discharges to a tundish from the combined temperature and pressure relief valve see also section 16 2 Physical contact 6 4 The surfaces of the storage cylinder are protected by the insulation In normal use the temperatures of the surfaces of the various parts of the system are comparable with those in a conventional vented hot water storage system Strength and stability 6 5 The system has adequate resistance to internal pressures and does not visibly deform when subjected to a vacuum of O 1 bar absolute 6 6 The system s pressure control devices will ensure that the operating pressure will be controlled to a nominal 3 bar and that the design pressure of 10 bar is not exceeded Each storage cylinder has Electronic Copy been satisfactorily pressure tested to 15 bar at the factory and no permanent deformation or leakage occurred 6 7 The weight of the system is stated on the label attached see also Table 1 the support arrangements appropriate to a conventional system apply 6 8 Care must be taken to avoid damage to the system during handling and installation Elec
29. imited or the BBA 5 Hot water storage and supply Hot water storage 5 1 The capacities of the system range are comparable with conventional systems see Table 3 Heating reheating and water draw off temperature A B e D E F System Immersion Heatup Percentage Mean Reheating Top Volume Table When heated to 60 C the system can ref heater time and quantity drawoff time immersion available supply 7095 of the storage capacity at the mean heated to within temperature is up above n 10 C of set time 40 C temperature given in Table 3 buon FI t kW minutes 75 litres c minutes minutes litres ere Tals D70 3 86 72 50 59 65 n a n a 5 2 The flow rates achieved at the hot water DI25 3 M4 75 94 60 10 wa ma draw off point will depend on all the normal factors D145 3 160 74 107 60 183 WO 60 including the layout of the pipework from the tap to V MEE ME NS MEC E ee e DD210 3 209 73 153 60 174 85 42 the cylinder the cold water supply pressure and bacas eet Cm ae AO sor coe rad the flow rate available at the supply to the system Dp300 3 292 72 20 59 270 7 45 Electronic Copy 5 3 For design purposes the graphs in Figure 4 show the relationship between flow available mains supply pressure and the maximum hot water flow rate out of the system Flow characteristics shown in the graphs reflect the worst combination of cold water control components that may be installed see Det
30. indirect cylinder non seltresetting thermal cutout fitted to the system and wired into the motorized valve For the direct immersion heater a the combined temperature and pressure relief valve and Electronic Copy b the direct non seltresetting thermal cutout fitted to the immersion heater The motorized valve is fitted to the primary flow and appropriate electrical connections made see section 16 6 6 2 The system has a safety warning label attached to the storage cylinder bearing an explanation of the action to be taken in the case of any malfunction of the system It is essential that these instructions are followed 6 3 The system has adequate provision for safe disposal of discharges to a tundish from the combined temperature and pressure relief valve see also section 16 2 Physical contact 6 4 The surfaces of the storage cylinder are protected by the insulation In normal use the temperatures of the surfaces of the various parts of the system are comparable with those in a conventional vented hot water storage system Strength and stability 6 5 The system has adequate resistance to internal pressures and does not visibly deform when subjected to a vacuum of O 1 bar absolute 6 6 The system s pressure control devices will ensure that the operating pressure will be controlled to a nominal 3 bar and that the design pressure of 10 bar is not exceeded Each storage cylinder has been satisfactorily pres
31. it the energy loss from the stored water and meets the requirements described in the Building Regulations 1991 as amended 1994 England and Wales Section 3 2 of Approved Document L1 the Building Standards Scotland Regulations 1990 as amended Regulation 22 Standard J3 4 and Technical Booklet F Paragraph 3 3 of the Building Regulations Northern Ireland 1994 5 12 The heat loss of each system while maintaining the temperature of the stored water at 65 C is shown in Table 4 Table 4 Standing energy losses System ref Heat loss Energy loss maximum daily IW KWh CL O 76 1 82 CL125 85 2 04 CL145 90 2 16 CL170 95 2 28 C1210 98 2 35 CL250 107 2 57 CL300 118 2 83 1 See section 4 5 2 These figures relate to a 45 C differential between the stored water and ambient temperature Connections 5 13 The system is designed to be connected to copper tube conforming to BS 2871 Part 1 1971 Tables X Y and Z using conventional plumbing fittings see Table 1 for details of connection sizes and threads The connections are of adequate size 6 Safety Excessive temperature Prevention of 133 explosion Safe discharge of hot water 6 1 The safety devices provided to ensure that the temperature of the stored water will not exceed 100 C and safeguard the operation of the system are For the indirect coil exchanger a the combined temperature and pressure relief valve and b the
32. lectrical appliances Section 2 21 1972 Electric immersion heaters BS 3955 1986 Specification for electrical controls for household and similar general purposes BS 6282 Devices with moving parts for the prevention of contamination of water by backflow Part 1 1982 Specification for check valves of nominal size up to and including DN 54 BS 6283 py and control devices for use in hot water systems Part 3 1982 Specification for combined temperature and pressure relief valves for pressures up to and including 10 bar Part 4 1982 Specification for drop ight pressure reducing valves of nominal size up fo and including DN 54 for supply pressures up to and including 12 bar BS 6700 1987 Specification for design installation testing and maintenance of services supplying water for domestic use within buildings and their curtilages BS 7671 1991 Requirements for electrical installations IEE Wiring Regulations Sixteenth edition MOAT No 38 1986 The assessment of unvented hot water storage systems and the approval and surveillance of installers Electronic Copy Electronic Copy La BRITISH BOARD OF MENT AGRE ASSESSMENT OF PRODUCTS FOR CONSTRUCTION On behalf of the British Board of Agr ment e term em Date of issue 22nd February 1995 Director British Board of Agr ment P O Box No 195 Bucknalls Lane Garston Watford Herts WD2 7NG Fax 01923 662133 Electronic Copy 1995 eA BRITISH
33. lves to include pressure control valve to BS 6283 Part 4 1982 check valve to BS 6282 Part 1 1982 combined temperature and pressure relief valve to BS 6283 Part 3 1982 line strainer immersion heater to BS 3456 Section 2 21 1972 immersion heater s thermostat non self resetting thermal cutout to BS 3955 1986 19 5 An examination was made of existing data relating to adequacy of installation instructions practicability of installation by the competent person electrical safety effect on water quality and prevention of waste of water properties in relation to fire practicability and adequacy of maintenance requirements durability of materials used 20 Other investigations The manvfacturing and assembly process was examined including the methods adopted for quality control and details were obtained of the quality and composition of materials used Electronic Co BS 864 Capillary and compression tube fittings of copper and copper alloy Part 2 1983 Specification for capillary and compression fittings for copper tubes BS 1449 Steel plate sheet and strip Part 2 1983 Specification for stainless and heatresisting steel plate sheet and strip BS 2871 Specification for copper and copper alloys Tubes Part 1 1971 Copper tubes for water gas and sanitation BS 2879 1980 1988 Specification for draining taps screw down pattern BS 3456 Specification for safety of household and similar e
34. ly as indicated in Table 1 1 3 The cylinder is insulated with polyurethane PU hard foam and covered in a white polyvinyl chloride PVC coated galvanized steel outer casing 1 4 For safety of the system electrical control devices and the combined temperature and pressure relief valve are factory fitted Other components including additional safety devices are supplied separately for fitting on site see Figure 1 and section 2 1 by a competent person see section 15 1 5 Factory production control is exercised during the manufacture and assembly of each of the components including visual examination dimensional checks and performance tests Each storage cylinder is pressure tested and examined for leaks during manufacture and prior to dispatch 1 6 When the system is commissioned an air gap is trapped at the top of the storage cylinder to accommodate expansion of the heated water see Figure 2 2 Delivery and site handling 2 1 The complete system is delivered to site boxed The following components see also Detail Sheet 2 of this Certificate are supplied separately with each storage cylinder for fitting on site by a competent person all other components are factory fitted cold water control valves to include pressure reducing valve strainer check valve and expansion relief valve tundish immersion heater s 2 2 When the system is required to be stored it must be stored in a dry environment and protecte
35. m compression inlet and 1 BSP female thread E rd outlet connection 1g 154 Hot water draw off 22 mm diameter stainless steel tube to BS 1449 Part 2 1983 grade 316 to suit compression fitting to BS 864 Part 2 1983 Stainless steel coil heat exchanger stainless steel to B5 1449 Part 2 1983 grade 316 Primary flow to suit 22 mm diameter compression fitting to BS 864 Pat 2 1983 Primary return to suit 22 mm diameter compression fitting to BS 864 Part 2 1983 Compression tee 22 X 15 x 22 mm to BS 2879 1980 Drain valve to BS 2879 1980 1988 Electronic Copy Figure 2 Expansion system operating cycle system commissioning ZA air gap h stage 2 stage 3 hos atl eem cold filling cylinder at 1 bar cylinder at cold water heated hot water drawn off to supply pressure stage level cold feed open hot tap open as system fills water flows out of hot tap water cold pressure O bar cold feed open hot tap closed water cold pressure bar volume of air gap 10 volume of water 90 water cold cold feed open hot tap closed pressure lt 3 bar max controlled by pressure control valve volume of air gap 5 volume of water 95 cold feed open hot tap closed water heated to 60 C and expands in cylinder cylinder air bubbl
36. nd must be maintained to this standard during the period of validity of this Certificate This Certificate will remain valid for an unlimited period provided that a the specification of the products is unchanged and b the manufacturer continues to have the products checked by the BBA 6 2 Where reference is made in this Certificate to any Act of Parliament Regulation made thereunder Statutory Instrument Code of Practice British Standard manufacturer s instruction or similar publication it shall be construed as reference to such publication in the form in which it is in force at the date of this Certificate 6 3 In granting this Certificate the BBA makes no representation as fo the presence or absence of patent rights subsisting in these products and or as to the legal right of Heatrae Sadia Heating Limited to market install or maintain these products 6 4 It should be noted that any recommendations relating to the safe use of these products which are contained or referred to in this Certificate are the minimum standards required to be met when the products are used They do not purport in any way to restate the requirements of the Health and Safety at Work etc Act 1974 or of any other statutory or Common Law duties of care or of any duty of care which may in the future exist nor is conformity with such recommendations to be taken as satistying the requirements of the 1974 Act or of any other present or future statut
37. ned an air gap is trapped at the top of the top of the storage cylinder to accommodate expansion of the heated water see Figure 2 2 Delivery and site handling 2 1 The complete system is delivered to site boxed The following components see also Detail Sheet 2 of this Certificate are supplied separately with each storage cylinder for fitting on site by a competent person all other components are factory fitted cold water control valves to include pressure reducing valve strainer check valve and expansion relief valve tundish immersion heater s motorized valve indirect thermal cutout wiring centre 2 2 When the system is required to be stored it must be stored in a dry environment and protected from damage 2 3 The system must be carefully handled and kept in the delivery carton until required for siting in position The weight of each system empty and full is stated in Table 1 and on the label attached to each cylinder 3 Labelling marking The system carries a label or labels bearing the information set out in Table 2 and is supplied with a comprehensive installation user manual Readers are advised to check that this Detail Sheet has not been withdrawn or superseded by a later issue by either referring to the Index of Current BBA Publications or contacting the BBA direct Telephone Hotline O 1923 662900 Table 1 Electronic Copy Storage capacities and dimensions Manufacturer s system
38. nstallation complies with the BBA Certificate by reference to the installers signature on the label attached to the cylinder By the Building Control Officer or Approved Inspector 1 1 2 and 3 as above Electronic Co 2 The combined temperature and pressure relief valve thermostats non selfresetting thermal cutouts motorized valve and immersion heater are as described in the Certificate 3 The tundish and discharge pipework are correctly located and fitted 14 Durability The system is manufactured from durable materials and conventional plumbing components and will have a life equal to that expected of a vented system It may be necessary to replace some of the system components for example the immersion heater thermostat etc see section 12 2 and Detail Sheet 2 of this Certificate 15 The installer 15 1 It is essential for reasons of safety and performance that the installation commissioning and maintenance of the system is carried out by a person with suitable training and practical experience However the assessment of training arrangements and continuing competence of installers falls outside the scope of this Certificate 15 2 It is the view of the Department of the Environment and stated in its Approved Document G3 that to meet the requirements of the Building Regulations 1991 as amended 1994 England and Wales concerned with unvented hot water storage systems installations should be
39. ons of Certification and the product s position regarding the Building Regulations respectively 1 Description 1 1 The Megatlo Indirect Unvented Hot Water Storage System is for use in domestic commercial and public buildings for connection to domestic hot and cold water services to BS 6700 1987 and comprises the components shown in Figure 1 The storage capacities and main dimensions are listed in Table 1 1 2 The system generally comprises a stainless steel storage cylinder complete with factory fitted stainless steel coil heat exchanger and immersion heater The system is for free standing installation and connects to a cold feed supply as indicated in Table 1 1 3 The oylinder is insulated with polyurethane PU hard foam and covered in a white polyvinyl chloride PVC coated galvanized steel outer casing 1 4 For safety of the system electrical control devices and the combined temperature and pressure relief valve are factory fitted Other components including additional safety devices are supplied separately for fitting on site see Figure 1 and section 2 1 by a competent person see section 15 1 5 Factory production control is exercised during the manufacture and assembly of each of the components including visual examination dimensional checks and performance tests Each storage cylinder is pressure tested and examined for leaks during manufacture and prior to dispatch 1 6 When the system is commissio
40. ory or Common Law duties of care In granting this Certificate the BBA does not accept responsibility to any person or body for any loss or damage incurred in respect of personal injury arising as a direct or indirect result of the use of these products La BRITISH BOARD OF ENT ASSESSMENT OF PRODUCTS FOR CONSTRUCTION In the opinion of the British Board of Agr ment Megaflo Unvented Hot Water Storage Systems are fit for their intended use if used as set out in this Certificate Certificate No 95 3094 is accordingly awarded to Heatrae Sadia Heating Limited On behalf of the British Board of Agr ment Date of issue 22nd February 1995 British Board of Agr ment P Box No 195 Bucknalls Lane Garston Watford Herts WD2 7NG Fax 01923 662133 1995 e Herm ee Director For technical or additional information tel 01923 670844 LAT For information about Agr ment Certificate validity and scope tel BBAZzs Hotline 01923 662900 Electronic Copy T dh 439 X Heatrae Sadia Heating Limited Certificate No 95 3094 BRITISH DETAIL SHEET 2 A MEGAFLO UNVENTED HOT WATER Pm vli ASSESSMENT OF PRODUCTS FOR CONSTRUCTION STORAGE SYSTEMS e THIS DETAIL SHEET LISTS THE COMPONENTS APPROVED FOR USE ON MEGAFLO UNVENTED HOT WATER STORAGE SYSTEMS e Each product Detail Sheet lists the components that are required to be factory fitted and others which are supplie
41. ply at pressures up to 12 bar 3 The Building Regulations Northern Ireland e It is essential for reasons of 42 In the opinion of the BBA the position of Megaflo Unvented Hot safety and performance that Water Storage Systems under the Building Regulations if used in the systems are installed and accordance with the provisions of this Certificate is as stated in Detail maintained in accordance with Sheet 1 this Certificate VEM d 4 The Health and Safety at Work etc Act 1974 and the Health and Safety at Work Northern Ireland Order 1978 EIQ In the opinion of the BBA the position of Megaflo Unvented Hot Water S Storage Systems under the Act and Order if used in accordance with the provisions of this Certificate is as stated in Detail Sheet 1 5 Water Byelaws and Regulations In the opinion of the BBA the position of Megaflo Unvented Hot Water Storage Systems under the Byelaws and Regulations if used in accordance with the provisions of this Certificate is as stated in Detail Sheet 1 Readers are advised to check that this Certificate has not been withdrawn or superseded by a later issue by either referring to the Index of Current BBA Publications or contacting the BBA direct Telephone Hotline 01923 662900 Electronic Copy 6 Conditions 6 1 The quality of materials and the method of manufacture have been examined and found satisfactory by the BBA a
42. pping of the non seltresetting thermal cutout 4 3 The pressure and flow available from the water mains should be obtained from the local water undertaker or by testing existing supplies to establish the likely performance of the system at peak periods 4 4 lt is essential for reasons of safety and performance that installation of the system is undertaken only by a competent person working in accordance with this Detail Sheet Electronic Copy Figure 3 Schematic layout indirect combined temperature and pressure relief valve cold water control valves hot draw off F expansion valve Caan pressure isolating control valve bs e B cylinder thermostat cold feed primary return ne arainer check H immersion heater L valve j norselfresetting iS thermal cutout and thermostat Cx es O balanced pressure primary flow cold drawoff discharge PRS H to safe position see section 16 2 T motorized valve indirect nonselkresetting thermal cutout drain valve Figure 4 Flow rates flow available 2 min at entry to system Notes 2 the graph represents the results of tests carried out by the BBA 3 where static water supplies are less than 1 bar consult Heatrae Sadia Heating Limited or the BBA static supply pressures of incoming water supply 70 7 hot cold mixed 60 4 5 50 5 50 4 hot 8 bar A E 4 bar X e Bus 3 bar 5 40 22 2 bar Te
43. referenc CL O CL125 CL145 CL170 CL210 CL250 CL300 water storage capacity litres at 1 bar 84 27 145 166 183 218 267 at 3 bar 92 137 155 178 195 233 283 cylinder size mm height 717 1023 1149 1306 1407 1659 1973 diameter 450 450 450 450 450 450 450 overall height 886 1192 1318 1475 1576 1828 2142 overall diameter 525 525 525 525 525 525 525 weight of unit kg empty 26 31 34 39 47 54 64 at 3 bar full operating 118 168 189 217 242 287 347 pressure capacity connection sizes mains water supply to control valves mm 22 22 22 22 22 22 22 control valves BSP inches 34 34 34 34 34 34 34 emperature and pressure relief valve 3A 3A 3A 3A 3A 3A 3A discharge BSP inches immersion heater ating at 240 V kW 3 3 3 3 3 3 3 heater length mm 280 280 280 280 280 280 280 clearance for removal mm 280 280 280 280 280 280 280 primary coil ube diameter mm 22 22 22 22 22 22 22 heating surface area m 0 39 0 52 0 59 0 72 0 78 0 78 0 78 Figure 1 General layout Key to Figure 1 1 Storage vessel manufactured from 1 mm thick stainless steel to BS 1449 Part 2 1983 grade 316S12 or duplex 2304 2 Heater flange stainless threaded boss welded to the storage cylinder to accept the immersion heater 3 Insulation expanded polyurethane foam 35 mm thick injected between cylinder and outer casing 4 Outer casing whi
44. rement of the deemed to satisfy provision to Technical Standard P3 1 Unvented Hot Water Storage System for compliance with Regulation 28 of the Building Standards Scotland Regulations 1990 as amended that such systems be in the form of a proprietary unit or package which is the subject of a BBA Certificate The Standard contains no specitic requirements for installers but the Certificates referred to state that installation must be undertaken by a competent person as defined in section 15 2 15 4 In Northern Ireland it is the requirement of Regulation P Deemed to satisfy provision for an unvented hot water storage system that systems with a capacity not greater than 500 litres and a heat input not greater than 45 kW be manufactured and installed in compliance with Certificates issued by the BBA under MOAT No 38 1986 Agr ment Certificates will refer to a need for installation by a competent person as defined in section 15 2 16 Conditions The following conditions abstracted from the manufacturer s instructions must be observed 1 The system must be connected to a water supply with a pressure not exceeding 12 bar and of a quality supplied by a water undertaker under the Water Byelaws and Water Regulations as appropriate 2 The combined temperature and pressure relief valve tundish must be in a clearly visible position within 500 mm of the cylinder and in the same compartment as the cylinder The discharge pip
45. sed is a conventional material It will not encourage vermin or bacteria and is not susceptible to damage from moisture 12 Maintenance 12 1 It is recommended that annually a competent person inspects and cleans the line strainer 12 2 The replacement or servicing of components must be carried out by a competent person using the Megatlo Installation Manual or by Heatrae Sadia Heating Limited under their responsibility as the product manufacturer including that required by their warranty using components supplied by Heatrae Sadia Heating Limited 12 3 The system may be drained through the drain valve 12 4 When the system is used in buildings subject to the Health and Safety at Work etc Act 1974 an inspection of the system must be carried out every six months 13 Site checks On site the following should be checked By the Client 1 The installer is a competent person by reference to his her identity card 2 The system being installed is BBA Certificated by reference to the label 3 That the installation complies with the BBA Certificate by reference to the installer s signature on the label attached to the cylinder By the Building Control Officer or Approved Inspector 1 1 2 and 3 as above 2 The combined temperature and pressure relief valve thermostat s non seltresetting thermal cut out s and the immersion heater s are as described in the Certificate 3 The tundish and dischar
46. sure tested to 15 bar at the factory and no permanent deformation or leakage occurred 6 7 The weight of the system is stated on the label attached see also Table 1 the support arrangements appropriate fo a conventional system apply 6 8 Care must be taken to avoid damage to the system during handling and installation Electrical safety 6 9 The indirect thermostat non seltresetting thermal cutout and motorized valve and the direct thermostat and non self resetting thermal cutout are approved by BEAB to BS 3955 1986 The immersion heater is approved by BEAB to BS 3456 Section 2 21 1972 To ensure safety it is essential that the electrical wiring is carried out in accordance with BS 7671 1992 7 Properties in relation to fire 7 The expanded polyurethane foam insulant is covered with a steel outer casing and only a small area of the insulant will be exposed at connection boxes In the pressure of a source of ignition such as a plumber s blowlamp the foam will flame locally and emit toxic fumes Flaming and fume emission will stop when the source of ignition is removed 7 2 In service the steel outer casing encloses the foam and risk of ignition will be minimal During installation care should be exercised when using a blowlamp to make soldered joints on pipework adjacent to the cylinder Installation does not require soldered joints to be made direct fo the system 8 Effect on water quality and prevention of w
47. te PVC coating over galvanized mild steel sheet ba ares 5 Cold water control valves to include pressure reducing valve yp roan voe p g set at 3 bar strainer check valve and expansion relief valve set at 8 bar Supplied separately for fitting by a competent person connection hot see Detail Sheet 2 of this Certificate for balanced supply 6 Cold water feed cylinder connection 22 mm diameter i cold supply a ete 13 compression fitting to BS 864 Part 2 1983 cold 7 Combined temperature and pressure relief valve The valve has feed yf P a set temperature of 90 C and a set pressure of 10 bar 7 Factory fitted 7 f 3 8 Immersion heater s to BS 3456 Section 2 21 1972 Heater i unit incorporates a thermostat and non selfresetting thermal cutout to BS 3955 1986 Thermostat set to a temperature of 65 C sd and cutout designed to operate when the stored water 54 12 l6 reaches 80 C 9 Indirect ones tog thermal cutout to BS 3955 1986 to i ROT 14 designed to operate when primary flow temperature reaches Q discharge 11 a 87 C to 93 C housed in a wiring centre for connection to a N SSS motorized valve jy umm 7 wg SSS O Motorized valve fitted to the primary flow 22 mm diameter En TEL N 4 compression fitting to BS 864 Part 2 1983 Supplied separately 10 8 for fitting by a competent person see section 16 6 M S if TW 1 Indirect heating cylinder thermostat Qo GB b 2 Tundish 22 m
48. th the Certificate see section 3 Electronic Copy The following is a summary of the technical investigations carried out on the Megatlo Direct Unvented Hot Water Storage System 19 Tests and investigations 19 1 Tests were carried out in accordance with MOAT No 38 1986 to determine capacity of storage cylinder dimensional accuracy mean supply temperature outlet flow rate at various supply flow rates and pressures time taken to heat to 60 C reheat time to 60 C standing energy loss adequacy of insulation watertightness resistance of the storage cylinder to an internal hydrostatic pressure of 1 5 times the design pressure 15 bar factory tested to 15 bar flow capacity of the tundish and discharge pipework 19 2 Other tests were carried out to determine variations of storage capacities with variations in supply pressure satistactory performance of the air gap 19 3 Tests were carried out to confirm satisfactory operation of the following components when fitted in a system cold water control valves to include pressure control valve check valve strainer expansion relief valve combined temperature and pressure relief valve immersion heater s thermostat and non self resetting thermal cut out 19 4 An examination was made of existing data in relation to the performance requirements of the relevant British Standards etc to determine the suitability and performance of cold water control va
49. ting at 240 V kW 3 3 3 3 3 3 3 heater length mm 280 280 280 280 280 280 280 clearance for removal mm 280 280 280 280 280 280 280 D prefix refers to systems with one immersion heater DD prefix refers to systems with two immersion heaters and DDD prefix to systems with three immersion heaters Figure 1 General layout Key to Figure 1 1 Storage cylinder manufactured from 1 mm thick stainless steel to BS 1449 Part 2 1983 grade 316 S12 or duplex 2304 Heater flange stainless steel threaded bosses welded to storage cylinder to accept the immersion heater s the Insulation expanded polyurethane foam 35 mm thick injected between storage cylinder and outer casing Outer casing white PVC coating over galvanized mild steel sheet Cold water control valves to include pressure reducing va lve set at 3 bar strainer check valve and expansion valve set at 8 bar Supplied separately for fitting by a competent person see Detail Sheet 2 of this Certificate Cold water feed cylinder connection to suit a 22 mm diameter compression fitting to BS 864 Part 2 1983 Combined temperature and pressure relief valve The valve has a set temperature of 90 C and a set pressure of 10 bar Factory titted mmersion heater s to BS 3456 Section 2 21 1972 Heater unit incorporates a thermostat and non selfresetting hermal cutout to BS 3955 1986 Thermostat set to a he stored water reaches 80
50. trical safety 6 9 The thermostat and nonselfresetting thermal cuFout are approved by BEAB to BS 3955 1986 The immersion heater is approved by the BEAB to BS 3456 Section 2 21 1972 To ensure safety it is essential that the electrical wiring is carried out in accordance with BS 7671 1992 7 Properties in relation to fire 7 1 The expanded polyurethane foam insulant is covered with a steel outer casing and only a small area of the insulant will be exposed at connection boxes In the presence of a source of ignition such as a plumber s blowlamp the foam will flame locally and emit toxic fumes Flaming and fume emission will stop when the source of ignition is removed 7 2 ln service the steel outer casing encloses the foam and risk of ignition will be minimal During installation care should be exercised when using a blowlamp to make soldered joints on pipework adjacent to the cylinder Installation does not require soldered joints to be made direct to the System 8 Effect on water quality and prevention of waste of water The system is listed by the Water Byelaws Scheme 9 Watertighiness The storage cylinder remains watertight at 1 5 times the design pressure ie factory tested to 15 bar 10 Noise The system is quiet in normal operation the flow of water being via conventional water pipe fittings and compares favourably with a vented hot water storage system 11 Physiological effects The insulation u
51. y tested to 15 bar flow ied tundish and discharge pipework 19 2 Other tests were carried out to determine variations of storage capacities with variations in supply pressure satisfactory performance of the air gap 19 3 Tests were carried out to confirm satisfactory operation of the following components when fitted in a system cold water control valves to include pressure control valve check valve strainer expansion relief valve combined temperature and pressure relief valve indirect cylinder thermostat and non selfresetting thermal cutout immersion heater thermostat and non seltresetting thermal cutout motorized valve 19 4 An examination was made of existing data in relation to the performance requirements of the relevant British Standards etc to determine the suitability and performance of cold water control valves to include pressure control valve to BS 6283 Part 4 1982 check valve to BS 6282 Part 1 1982 combined temperature and pressure relief valve to BS 6283 Part 3 1982 line strainer immersion heater to BS 3456 Section 2 21 1972 indirect cylinder thermostat and non selfresetting thermal cutout to BS 3955 1986 direct immersion heater thermostat non selFresetting thermal cutout to BS 3955 1986 motorized valve to BS 3955 1986 19 5 An examination was made of existing data relating to adequacy of installation instructions practicability of installation by the
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