Home

Electronic Copy - RIBA Product Selector

1. OSO Hotwater UK Limited Certificate No 94 3022 BRITISH DETAIL SHEET 3 fA conc or OSO DIRECT UNVENTED HOT WATER AT TECHNICAL APPROVALS FOR CONSTRUCTION STORAGE SYSTEM t e THIS DETAIL SHEET RELATES TO THE OSO DIRECT UNVENTED HOT WATER STORAGE SYSTEM WITH A RANGE OF CAPACITIES FROM aD 100 TO 330 LITRES A NOMINAL OPERATING PRESSURE OF 2 BAR ii AND FITTED WITH ONE OR TWO IMMERSION HEATERS s P e The system is for use with mains or other suitable potable water supply a 4 5 pressures up to and including 12 bar aa 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 perk that th duct i 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 Sheets and Detail Sheet 1 which give Conditions of Certification and the product s position regarding the Building Regulations respectively 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 heate
2. 2 Delivery and site handling 2 1 The complete system is delivered to site protected by a cardboard box The following items 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 combined pressure reducing valve and line strainer combined expansion and check valve secondary return commissioning fitting drain valve motorized valve Readers are advised to check the validity of this Detail Sheet by either referring to the BBA s website www bbacerts co uk or contacting the BBA direct Telephone Hotline 01923 665400 tundish tee piece and flexible hose 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 cardboard box until required for siting in Figure 1 General layout Electronic Copy position The Weight of each system empty and full is stated in Table 1 and on the label attached to each system 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 Key to Figure 1 1 Storage cylinder manufactured from stainless steel Uginox F 18 MT to BS EN 10088 2 1995 2 Insulation 100 litres to 250 litres cylinders polyurethane foam and 330 litres cylinde
3. 1 The system complies with the Low Voltage Directive 73 23 EEC 2 The system when installed correctly will comply with the Electromagnetic Compatibility Directive 89 336 EEC 3 ACE mark applied to these products by the manufacturer relates only to the Low Voltage and Electromagnetic Compatibility Directives In the opinion of the BBA the application of the CE mark does not infer compliance with the requirements of the applicable Building Regulations 1 The installer must meet the definition of a competent person as defined in section 15 2 Figure 2 Expansion system Electronic Copy system commissioning cold filling cold feed open hot tap closed commissioning valve open when water comes out of commissioning valve 2 close valve cylinder at 1 bar cold feed open hot tap closed water cold pressure bar volume of air 25 volume of water 75 stage cylinder at cold supply pressure cold feed open hot tap closed water cold max pressure 2 bar volume of air 17 volume of water 83 operating cycle stage 2 water heated cold feed open hot tap closed water heated cylinder air bubble compresses pressure lt 3 5 bar volume of air 15 stage 3 hot water drawn off to stage 1 level cold feed open hot tap open water level drops to stage 1 level no cold water fed into cylinder water hot water cold pressure O bar volume of air 50 volume
4. 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 Heat up re heating and hot water draw off temperature 5 5 The heatup and reheat times are comparable with conventional systems of a similar size supplying hot water 5 6 The coil heat exchanger with a primary flow at 80 C 2 C or the immersion heater will heat listed in columns A and D of Table 3 5 7 The amount of water that can be drawn off within 10 C of the set temperature is shown 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 The average temperature of a 55 litre draw off after using the immersion heater to achieve 60 C is given in column E Temperature control 5 8 The indirect thermostat is fitted to the 4 system and connected via the wiring loom to the motorized valve and provides adequate control of the stored water The direct thermostat wired fo the immersion heater is satisfactory for controlling the temperature of the stored water when this form of heating is used 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 cylind
5. Design 1 Maximum water supply pressure bar 2 Operating pressure bar 3 Pressure control valve setting bar 4 Expansion system relief via the expansion valve bar 5 Storage capacity litres 6 Weight of system full kg Safety warnings conditions 1 Installation to be carried out only a competent person 2 The removal replacement of any component to be carried out only by a competent person using components supplied by OSO Hotwater UK Limited in accordance with their instructions 3 Any malfunction of the system such as that resulting in discharge of water to the tundish from the combined temperature and pressure relief valve to be reported to a competent person after switching off the heat source and prior to any further use of the system 4 The installation of 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 Northern Ireland Order 1978 where appropriate 5 If water discharges from the expansion valve the system must be recommissioned in accordance with the manufacturer s instructions Installer details 1 Space for a Name b Address c Telephone number d Completion date le Registration No 2 A declaration that installation has been in accordance with BBA Certificate No 94 3022 with space for the signature of the installer CE mark
6. 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 thermostats nonrself resetting thermal cut out and the immersion heater s are as described in the Certificate Electronic opy 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 4 15 2 n England and Wales it is the view of 5 the DETR and stated in its Approved Document G3 that to meet the requirements of the Building Regulations concerned with unvented hot water storage systems installation should be undertaken by a competent person defined as one holding a current Registered Operative Identity Card for the installation o
7. 5 5 The heatup and reheat times are comparable with conventional systems supplying hot water 5 6 The immersion heaters will heat the stored water from 15 C to 60 C in the time listed in columns A and E of Table 3 5 7 The amount of water that can be drawn off within 10 C of the set temperature is listed in of the water draw off immediately after reaching 60 C in column C and the time taken to reheat the stored water to 60 C in column D The average temperature of a 55 litre draw off after using the upper immersion heater to achieve 60 C is given in column F Temperature control 5 8 The direct thermostat wired to the 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 fo a maximum of 3 5 bar see Figure 2 Under failure conditions the expansion valve ensures the pressure will not exceed 8 bar Each storage cylinder is factory tested to 16 bar Insulation ff 5 10 The system is provided with adequate 4 insulation to satisfactorily limit the energy loss from the stored water and meets the requirements described in the national Building Regulations Elect
8. 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 n England and Wales it is the view of Fn the DETR and stated in its Approved Document G3 that to meet the requirements of the Building Regulations concerned with unvented hot water storage systems installation 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 k 15 3 In Scotland it is the requirement 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 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 4 15 4 In Northern Ireland it is the A requirement of Regulation P5 Unvent
9. 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 take off is provided on the pressure reducing valve assembly see Figure 3 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 OSO installation instruction leatlet Electronic Cop 18 2 When y commissioning instructions are followed an air gap at the top of the storage cylinder is formed see Figure 2 It is important to ensure that the air gap is formed properly by adopting the following procedure 1 All hot water taps are closed and the commissioning valve on the secondary return fitting opened The cold water supply valve is opened 2 When water issues from the commissioning valve the valve is closed 3 10 to 15 minutes is allowed for the system to stabilise 4 To slowly release trapped air the nearest hot water tap fo the cylinder is gradually opened 5 To ensure all
10. installation of 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 Northern Ireland Order 1978 where appropriate 5 If water discharges from the expansion valve the system must be recommissioned in accordance with the manufacturer s instructions Installer details 1 Space for a Name b Address c Telephone number d Completion date le Registration No 2 A declaration that installation has been in accordance with BBA Certificate No 94 3022 with space for signature of the installer CE mark 1 The system complies with the Low Voltage Directive 73 23 EEC 2 The system when installed correctly will comply with the Electromagnetic Compatibility Directive 89 336 EEC 3 ACE mark applied to these products by the manufacturer relates only to the Low Voltage and Electromagnetic Compatibility Directives In the opinion of the BBA the application of the CE mark does not infer compliance with the requirements of the applicable Building Regulations 1 The installer must meet the definition of a competent person as defined in section 15 2 Electronic Copy Figure 2 Expansion system operating cycle system commissioning cold filling cold feed open hot tap closed commissioning valve open when water comes out of commissioning valve 2 close valve cylinde
11. pressure relief valve are factory fitted Other components including additional safety devices are supplied separately for fitting on site see Figure 1 and sections 2 1 by a competent person see section 15 2 3 The system must be caretully handled and kept in the cardboard box 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 1 5 Factory production control is exercised during the manufacture and assembly of each of the The system carries a label or labels bearing the components including visual examination information set out in Table 2 and is supplied with dimensions checks and performance tests Each a comprehensive installation user manual Readers are advised to check the validity of this Detail Sheet by either referring to the BBA s website www bbacerts co uk or contacting the BBA direct Telephone Hotline 01923 665400 Figure Electronic Copy General layout Key to Figure 1 1 NOOR WD Storage cylinder manufactured from stainless steel Uginox F 18 MT to BS EN 10088 2 1995 Insulation 100 litres to 250 litres cylinders polyurethane foam and 330 litres cylinder glass wool 40 mm thick Combined pressure reducing valve set at 2 bar balanced cold take off 22 mm blanked and line strainer with a 22 mm diameter inlet compression fitting to BS 864 2 1983 Combine
12. resistance fo partial vacuum of O 1 bar absolute flow capacity of the tundish and discharge pipework Electronic Copy 19 2 Other tests were carried out to determine variations of storage capacities with variations in supply pressure satistactory performance of the expansion system 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 expansion valve line strainer combined temperature and pressure relief valve direct immersion heater thermostat and non selt resetting thermal cutout 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 4 1991 check valve to BS 6282 1 1991 expansion valve to BS 6283 1 1991 line strainer combined temperature and pressure relief valve to BS 6283 3 1991 immersion heater to BS EN 60335 2 73 1997 direct thermostat and non selfresetting thermal cut out to BS 3955 1986 5 An examination was made of existing data etic 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 practica
13. valve pressure primary flow control valve isolating valve expansion valve cold feed primary return discharge pipe to drain valve balanced safe position pressure cold see section 16 2 draw off check valve Table 3 Heatup reheating and water draw off temperature Indirect heating System Actual Primary A B Cc D ref capacity flow Heatup Percentage of Mean Re heating litres time draw off within draw off time per 10 C of set temperature minute temperature litres litres minutes litres C minutes 100 98 3 25 64 63 57 22 125 123 5 32 85 104 60 28 170 165 5 33 79 130 60 30 210 203 5 39 84 171 60 33 250 239 5 45 95 226 60 37 330 317 5 65 83 264 60 52 1 These heatup times assume a boiler of adequate output is connected to the system Primary flows of 15 litres per minute can be attained normally with a standard domestic circulating pump Direct heating System Actual Heat A B GC D E ref capacity source Heatup Percentage of Mean Re heating Average immersion time draw off within draw off time temperature of a heater 10 C of set temperature 55 litre draw off temperature litres kV minutes litres C minutes C 100 98 3 89 64 63 57 81 125 123 3 116 85 104 60 102 38 170 165 3 161 79 130 60 148 45 210 203 3 200 84 171 60 175 48 250 239 3 240 95 226 60 202 51 330 317 3 327 83 264 60 263 56 Electronic Copy Fi
14. Electronic Copy ee 53 3 X F Lim OSO Hotwater UK Limited 6 Defender Court BRITISH Sunderland Enterprise Park West Agr ment BOARD OF Sunderland Certificate AGR MENT amp Wear SR5 3PE No 94 3022 ASSESSMENT OF PRODUCTS FOR CONSTRUCTION Tel 0191 516 0374 Fax 0191 516 0647 Second re Designated by Government fo issue OSO UNVENTED HOT WATER STORAGE SYSTEMS uropean Technical e a Approval e Regulations Legislation and Byelaws Detail Sheet 1 e THIS CERTIFICATE RELATES 1 The Building Regulations 1991 as amended England and Wales TO OSO UNVENTED HOT erame Snel d with the Briti ry of State has agreed with the British Board of Agr ment WATER STORAGE SYSTEMS n the aspects of performance to be used by the BBA in assessing the e The systems are for use in compliance of unvented hot water storage systems with the Building domestic commercial and Regulations In the opinion of the BBA OSO Unvented Hot Water Storage public buildings with domestic Systems if used in accordance with the provisions of this Certificate will meet hot and cold water services to the relevant requirements BS 6700 1987 Requirement G3 Hot water storage e The systems are for Comment See sections 6 and 15 2 of each system Detail Sheet conneclioh mains waler Requirement L1 Conservation of fuel and power hiat f Comment See the marked parts of section 5 of each system Detail PPY AN PISSI
15. Hotline 01923 665400 Electronic Copy ive A _N AES OSO INDIRECT UNVENTED AGREMENT HOT WATER STORAGE SYSTEM TECHNICAL APPROVALS FOR CONSTRUCTION OSO Hotwater UK Limited 53 3 X Certificate No 94 3022 DETAIL SHEET 4 Fourth issue e THIS DETAIL SHEET RELATES TO THE OSO INDIRECT UNVENTED HOT WATER STORAGE SYSTEM WITH A RANGE OF CAPACITIES FROM 100 TO 330 LITRES A NOMINAL OPERATING PRESSURE OF 2 BAR AND FITTED WITH ONE IMMERSION HEATER 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 e The system can be used with a vented or pressurised primary with a maximum primary pressure of 3 5 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 Sheets and Detail Sheet 1 which give the Conditions of Certification and the product s position regarding the Building Regulations respectively 1 Description 1 1
16. S UPTO Sheet Systems with a capacity of more than 150 litres that y pacity 12 bar are not heated by off peak electricity should be fitted with a e It is essential for reasons of time switch safety and performance that Requirement Regulation 7 Materials and workmanship f Comment The systems are acceptable the systems are installed and maintained in accordance with 2 The Building Standards Scotland Regulations 1990 as amended this Certificate k In the opinion of the BBA OSO Unvented Hot Water Storage Systems if used in accordance with the provisions of this Certificate will satisfy or contribute to satisfying the various Regulations and Technical Standards listed below Regulation 10 Fitness of materials Standard B2 1 Selection and use of materials and components Comment The systems comply with the requirements of this Standard Regulation 22 Conservation of fuel and power Standard J5 2 Controls for hot water storage vessels Comment The systems are fitted with a thermostat which meets the requirements of Standard J5 2a Systems having a capacity of more than 150 litres and where the water is not heated by offpeak electricity require a time switch that can start up and shut off the supply of heat See the marked parts of section 5 of each system Detail Sheet Standard BS Insulation of hot water storage vessels Comment The storage vessels have a heat loss of not more than 90 Wm and th
17. The OSO 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 a factorytitted stainless steel coil heat exchanger and one immersion heater All models are free standing and connect to a cold feed supply as indicated in Table 1 1 3 The 100 litres to 250 litres cylinders are insulated with polyurethane foam the 330 litres cylinder is insulated with glass wool The cylinders have an external casing of epoxy coated mild steel sheets 1 4 For safety of the system electrical control devices and the combined temperature and pressure relief valve are factory fitted Other components 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 air is trapped at the top of the storage cylinder to accommodate expansion of the heated water see Figure 2
18. USE ON OSO UNVENTED HOT WATER STORAGE SYSTEMS e Each system Detail Sheet lists the components that are required to be factory fitted and others which are supplied 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 Manufacturer supplier Setting Size and component number Combined pressure reducing valve Reliance PRED 510012 2 1 bar 22 mm Line strainer E Pressure control valve Reliance DA75 2 1 bar y Reliance PRED 510503 2 1 bar y Honeywell DO72F 2 1 bar 4 Desbordes 9BisFX 2 1 bar fa Combined check and expansion relief valve Reliance PRED 214008 8 bar 22 mm and balanced draw off Reliance CORE 214 8 bar y Combined temperature and pressure relief valve Reliance PEM 550010 90 C 10 bar y2 Reliance ZTPR 550803 90 C 10 bar Yo Tundish Reliance TUN 218008 Y x1 Reliance TUN 219002 _ 15 mm x 22 mm Braided hose 220 mm Reliance hose 202108 15 mm Combined indirect thermostat and non self Thermodisc 59T 66T A5 C to 75 C resetting thermal cutout 85 C 3 C Combined direct thermostat and non self Thermodisc 591 667 45 C to 75 C resetting thermal cutout 85 C 3 C Motorized valvet Honeywell V4043 H 1056 3 4 ACL Drayton 679H30B 30L1 a flt is essential on indirectly heated systems that the motorized valve supp
19. air is expelled from the system the remaining taps are opened in turn 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 direct thermostat is checked and an examination carried out to ensure that no water has discharged from the combined temperature and pressure relief valve during the heat up 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 OSO 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 fo 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 16 bar
20. bility and adequacy of maintenance requirements durability of materials used 19 6 An evaluation of tests in accordance with MOAT No 38 1986 and existing data relating to standing energy loss with polyurethane foam insulations 20 Other investigations The manufacturing 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 BS 864 2 1983 Specification for capillary and compression fittings for copper tubes BS 2879 1980 1988 Specification for draining taps screw down pattern 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 BS 6282 1 1991 Specification for check valves of nominal size up to and including DN 54 BS 6283 Safety and control devices for use in hot water systems BS 6283 1 1991 Specification for expansion valves for pressures up to and including 10 bar BS 6283 3 1991 Specification for temperature and pressure relief valves for pressures up to and including 10 bar BS 6283 4 1991 Specification for droptight pressure reducing valves of nominal size up to and including DN 54 for supply pressures up to and including 12 bar BS 6700 PY Specification for design
21. d 1991 6 The Electrical Equipment Safety Regulations 1994 and the Electromagnetic Compatibility Regulations 1994 These Regulations implement the Low Voltage Directive 73 23 EEC as amended by the CE Marking Directive 93 68 EEC and the Electromagnetic Compatibility Directive 89 336 EEC and require manufacturers to carry out assessment of their products against the criteria given in the Directives Declarations of Conformity have been provided by OSO Hotwater UK Limited The BBA has not assessed the product for compliance with these Directives Electronic Cop 7 Conditions 7 1 This Certificate a relates only to the product that is described installed used and maintained as set out in this Certificate b is granted only to the company firm or person identified on the front cover no other company firm or person may hold or claim any entitlement to this Certificate c has to be read considered and used as a whole document it may be misleading and will be incomplete to be selective d is copyright of the BBA 7 2 References in this Certificate to any Act of Parliament Regulation made thereunder Directive or Regulation of the European Union Statutory Instrument Code of Practice British Standard manufacturers instructions or similar publication shall be construed as references to such publication in the form in which it was current at the date of this Certificate 7 3 This Certificate wil
22. d check valve and expansion valve Expansion valve set at 8 bar Combined temperature and pressure relief valve The valve has a set temperature of 90 C and a pressure of 10 bar Factory itted Tundish 22 mm connection mmersion heater to BS EN 60335 2 73 1997 wired to 7A Thermostat set to a temperature of 60 C and the cutout is designed to operate when the stored water reaches 85 C Hot water draw off connection 22 mm diameter Combined secondary return commissioning connection Yo BSP female Drain valve to BS 2879 1980 1988 Cold supply connection 3 4 BSP female elbow 3 4 BSP male by 22 mm compression fitting to BS 864 2 1983 Cable entry glands Electrical boxes Tee piece Flexible hose Discharge pipe Cold feed pipe ltems 3 4 6 10 11 14 and 15 are supplied separately for ting by a competent person see Detail Sheet 2 of this Certificate 580 hermostat non selfresetting thermal cutout to BS 3955 1986 8 t jo 3 T 4 4 15 5 t3 2 o J 6 9 3 0 el 16 k gt oea S 4 gt i 17 12 amp 11 S Pavan ON Ste Electronic Copy Table Storage capacities and dimensions 100 1250 170 210 250 3301 storage capacity litres at 2 bar 98 123 165 203 239 317 cylinder size mm height 670 850 1100 1350 1550 2040 diameter 500 500 500 500 500 500 ove
23. d water see Figure 2 1 Description 1 1 The OSO 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 2 Delivery and site handling comprises the components shown in Figure 1 The nae 2 1 The complete system is delivered to site storage capacities and main dimensions are listed protected by a cardboard box The following in Table 1 components see also Detail Sheet 2 of this 1 2 The system generally comprises a stainless Certificate are supplied separately with each steel storage cylinder complete with one or two storage cylinder for fitting on site by a competent factorytitted immersion heaters All models are free person all other components are factory fitted standing and connect to a cold feed supply as pressure reducing value and line strainer indicated in Table 1 combined expansion and check valve 1 3 The 100 litres to 250 litres cylinders are tundish tee piece and flexible hose insulated with polyurethane foam the 330 litres secondary return commissioning fitting drain valve cylinder is insulated with glass wool The cylinders have an external casing of epoxy coated mild steel sheet 2 2 When the system is required to be stored it must be stored in a dry environment and protected from damage 1 4 For safety of the system electrical control devices and the combined temperature and
24. e is connected to and from the tundish to a sate 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 OSO Installation and Operating Instructions 18 2 When commissioning instructions are followed an air gap at the top of the storage cylinder is formed see Figure 2 It is important to ensure that the air gap is formed properly by adopting the following procedure 1 All hot water taps are closed and the commissioning valve on the secondary return fitting opened The cold water supply valve is opened 2 When water issues from the commissioning valve the valve is closed 3 10 to 15 minutes is allowed for the system to stabilise 4 To slowly release trapped air the nearest hot water tap fo the cylinder is gradually opened 5 To ensure all air is expelled from the system the remaining taps are opened in turn 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 allowed to reach normal working temperature The operation of the indirect and direct thermostats and moto
25. e 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 on 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 2 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 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 4 Electrical wiring must be carried out in accordance with BS 7671 1992 IEE Wiring Regulations The immersion heater circuit must be protected by a suitably rated fuse eg 13A and an isolating switch with a double pole disconnection 17 Procedure 17 1 The storage cylinder is located in position see the OSO installation instruction leaflet and the plumbing connections made to the inlet and outlet pipes in the same manner
26. ed hot water storage systems that systems with a capacity not greater than 500 litres and a heat input not greater than 45 kW be manufactured Electronic Copy 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 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 fo 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 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 locatio
27. er causing an increase in pressure to a maximum of 3 5 bar see Figure 2 Electronic Cop Under failure conditions the expansion valve ensures the pressure will not exceed 8 bar Each storage cylinder is factory tested to 16 bar Insulation 5 10 The system is provided with adequate 4 insulation to satisfactorily limit the energy loss from the stored water and meets the requirements described in the Building Regulations England and Wales Approved Document L Section 3 2 Scotland Standard J5 3 Northern Ireland Technical Booklet F Paragraph 3 3 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 Heat loss Energy loss ref W kWh 24h 100 73 1 75 125 74 1 78 170 85 2 04 210 102 2 45 250 118 2 83 330 200 4 80 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 EN 1057 1996 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 5 of 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 a
28. es to include pressure control valve check valve expansion valve combined temperature and pressure relief valve indirect cylinder thermostat and non selfresetting thermal cutout motorized valve Copy 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 4 1991 check valve to BS 6282 1 1991 expansion valve to BS 6283 1 1991 line strainer combined temperature and pressure relief valve to BS 6283 3 1991 immersion heater to BS EN 60335 2 73 1997 indirect cylinder thermostat and 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 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 19 6 An evaluation of tests in accordance with MOAT No 38 1986 and existing data relating to standing energy loss with polyurethane foam insulations 20 Other investigations The manufacturing and assembly process was examined including the methods adopted for quality control and details were obta
29. f 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 A deemed o satisfy provision to Technical Standard P3 1 Unvented Hot Water Storage System for compliance with Regulation 28 of the Building Standards Scotland Regulations 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 4 15 4 In Northern Ireland it is the a requirement of Regulation P5 Unvented hot water storage systems that systems with a capacity not greater than 500 litres and a heat input not greater than 45 kW be certified as meeting the relevant requirements of Regulation P5 by a member body of EOTA operating a Technical Approvals Scheme eg 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 combined temperature and pressure relief valve tundish must be in a clearly visibl
30. gure 4 Flow rates 70 hot cold mixed m mixed water at 40 C mixed from 8 bar 60 60 hot water at 60 C and 4 bat hot E 40 cold water at 10 C 3 bar 50 2 50 2 bar E 8 bar K m 2 40 ot 5 40 1 bar 2 2 bar E 5 30 3 30 T 1 oS 1 bar Z 8 20 20 2 3 z 10 10 34 values 3 4 values O 10 20 30 40 50 O 10 20 30 40 50 60 70 flow available litres min at entry to system flow available litres min at entry to system Notes Flow rates shown apply to situations where the supply is capable of supplying an adequate dynamic pressure The graph represents the results of tests carried out by the BBA Where static water supplies are less than 1 bar consult OSO Hotwater UK Limited or the BBA 1 Static supply pressures of incoming water supply Flow rates the stored water from 15 C to 60 C in the time 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 1 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
31. ined of the quality and composition of materials used Electronic Co BS 864 Capillary and compression tube fittings of copper and copper alloy BS 864 2 1983 Specification for capillary and compression fittings for copper tubes BS 2879 1980 1988 Specification for draining taps screw down pattern 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 BS 6282 Devices with moving parts for the prevention of contamination of water by backflow BS 6282 1 1991 Specification for check valves of nominal size up to and including DN 54 BS 6283 Safety devices for use in hot water systems BS 6283 1 1991 Specification for expansion valves for pressures up to and including 10 bar BS 6283 3 1991 Specification for combined temperature and pressure relief valves for pressures from l bar to 10 bar BS 6283 4 1991 Specification for drop tight pressure reducing valves of nominal size up to and including DN 50 for supply pressures up to and including 12 bar BS 6700 PY Specification for design installation testing and maintenance of services supplying water for domestic use within buildings and their curtilages BS 7671 1992 Requirements for electrical installations IEE Wiring Regulations Sixteenth edition BS EN 1057 1996 Copper and copper alloys Seamle
32. installations testing and maintenance of services supplying water for domestic use within buildings and their curtilages BS 7671 1992 Requirements for electrical installations IEE Wiring Regulations Sixteenth edition BS EN 1057 1996 Copper and copper alloys Seamless round copper tubes for water and gas in sanitary heating applications BS EN 10088 Stainless steels BS EN 10088 2 1995 Technical delivery conditions for sheet plate and strip for general purposes BS EN 60335 Specification for satety of household and similar electrical appliances BS EN 60335 2 Particular requirements BS EN 60335 2 73 1997 Fixed immersion heaters MOAT No 38 1986 The assessment of unvented hot water storage systems and the approval and surveillance of installers La BRITISH BOARD OF AGREMENT TECHNICAL APPROVALS FOR CONSTRUCTION On behalf of the British Board of Agr ment Date of Fourth issue 7th June 2001 e Herm ee Chief Executive Original Detail Sheet 3 issued 6th June 1994 This revised version includes update of Standards reference to Slimline cylinders and additional connection details Electronic Copy British Board of Agr ment 2001 tot Saat or aramona 5300 P O Box No 195 Bucknalls Lane TF NS For information about Agr ment Garston Watford Herts WWD25 9BA email mail bba star co uk Certificate validity and scope tel ITISH Fax 01923 665301 website www bbacerts co uk BBA ta
33. l remain valid for an unlimited period provided that the product and the manufacture and or fabricating process es thereof a are maintained at or above the levels which have been assessed and found to be satisfactory by the BBA b continue Y checked by the BBA or its agents and c are reviewed by the BBA as and when it considers appropriate 7 4 In granting this Certificate the BBA makes no representation as to a the presence or absence of any patent or similar rights subsisting in the product or any other product b the right of the Certificate holder to market supply install or maintain the product and c the nature of individual installations of the product including methods and workmanship 7 5 Any recommendations relating to the use or installation of this product which are contained or referred to in this Certificate are the minimum standards required to be met when the product is used They do not purport in any way to restate the requirements of the Health amp Satety at Work etc Act 1974 or of any other statutory common law or other duty which may exist at the date of this Certificate or in the future nor is conformity with such recommendations to be taken as satisfying the requirements of the 1974 Act or of any present or future statutory common law or other duty of care In granting this Certificate the BBA does not accept responsibility to any person or body for any loss or damage inc
34. lied 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 carried out using the OSO installation instruction leaflet by a competent person see section 15 of each system Detail Sheet or by OSO Hotwater UK Limited under their responsibility as the product manufacturer including that required by their warranty using components supplied by OSO Hotwater UK 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 01923 665400 Electronic Copy La BRITISH BOARD OF ENT ASSESSMENT OF PRODUCTS FOR CONSTRUCTION On behalf of the British Board of Agr ment fo pete Date of Third issue 30th March 1999 Director Original Detail Sheet 2 issued 6th June 1994 This amended version includes additional alternative components for use with the system British Board of Agr ment 1999 toms Eco cae Fe esas P O Box No 195 Bucknalls Lane DAAN Fo information about Agr ment Garston Watford Herts WD2 ZNG email mail bba star co uk Certificate validity and scope tel BBA Hotline 01923 665400 Fax 01923 665301 http www bbacerts co uk Electronic Copy ive A 53 3 X
35. luding personal injury arising as a direct or indirect result of the installation and use of this product La BRITISH BOARD OF AGREMENT ASSESSMENT OF PRODUCTS FOR CONSTRUCTION In the opinion of the British Board of Agr ment OSO Unvented Hot Water Storage Systems are fit for their intended use if installed used and maintained as set out in this Certificate Certificate No 94 3022 is accordingly awarded to OSO Hotwater UK Limited On behalf of the British Board of Agr ment Date of Second issue 30th March 1999 Ko Metre Director Original Front Sheets and Detail Sheet 1 issued 6th June 1994 This amended version issued to include reference to the revised national Building Regulations revised Conditions of Certification and Certificate format Electronic Copy ai F For technical or additional British Board of Agr ment 1999 tot information tel 01923 665300 P O Box No 195 Bucknalls Lane CZaN For information about Agr ment Garston Watford Herts WD2 ZNG email mail bba star co uk Certificate validity and scope tel Fax 01923 665301 http www bbacerts co uk BBA 22 Hotline 01923 665400 Electronic Copy sive Lo 53 3 X OSO Hotwater UK Limited Certificate No 94 3022 BOARD DETAIL SHEET 2 PA cence or OSO UNVENTED HOT WATER STORAGE TAIA iUe ASSESSMENT OF PRODUCTS FOR CONSTRUCTION SYSTEMS e THIS DETAIL SHEET LISTS THE COMPONENTS THAT ARE APPROVED FOR
36. nd safeguard the operation of the system are For the indirect coil heat exchanger a the combined temperature and pressure relief valve and b the indirect non seltresetting thermal cutout wired fo the motorized valve For the direct immersion heater a the combined temperature and pressure relief valve and b the direct non self resetting thermal cutout fitted to the system and wired to the immersion heater 6 2 The system has a satety warning label attached to the storage cylinder bearing an explanation AA 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 surtaces 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 the vacuum relief valve is effective in preventing reduced pressure within the system 6 6 The system s pressure control devices will ensure that the operating pressure will be controlled fo a nominal 2 1 bar and that the design pressure of 10 bar is not exceeded Each storage cylinder has been sa
37. ns advantageous to the building designer see Table 1 for load weight of the system when tull It is important to ensure there is an adequate clearance for the removal of the immersion heater 5 Electrical wiring must be carried out in accordance with BS 7671 1992 IEE Wiring Regulations The immersion heater circuit must be protected by a suitably rated fuse and an isolating switch with a double pole disconnection 6 It is essential 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 OSO installation instruction leaflet 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 take off is provided on the pressure reducing valve assembly see Figure 3 using components supplied by OSO Hotwater UK Limited 17 2 The discharge pip
38. ns supply pressure 5 Hot water storage and supply Hot water storage 5 1 The capacities of the system range are comparable with conventional systems see Table 1 When heated to 60 C the system can supply 70 of the storage capacity at the mean temperature given in Table 3 Electronic Copy Figure 3 Schematic layout direct hot draw off combined temperature and pressure relief valve cold water control valves pies a Soe expansion valve l l 1 l pressure I isolating l eni I valve valve i l cold feet gt drain valve discharge pipe to balanced ld safe position pressure CO draw off check valve ee secon ioe cold feed Table 3 Heatup reheating and water draw off temperature System Actual Heat A B C D E F ref capacity source Heatup Percentage of Mean Reheating Upper Average immersion time draw off within draw off time immersion temperature of a heater O C of set temperature heatup time 55 litre draw off temperature litres kV minutes litres C minutes minutes C 100 98 3 89 64 63 37 8 a 125 123 3 116 85 104 60 102 36 38 170 165 3 16 79 130 60 148 64 45 210 203 3 200 84 171 60 175 68 48 250 239 3 240 95 226 60 202 72 51 330 317 3 327 83 264 60 263 77 56 Electronic Copy Figure 4 Flow rates 70 hot cold mixed m mixed water at 40 C mixed from 8 bar 60 60 hot water at 60 C and 4 bar hot 40 cold water a
39. ntional 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 a inspects and cleans the line strainer b recommissions the system in accordance with the manufacturer s instructions see section 18 12 2 The replacement or servicing of components must be carried out by a competent person using the OSO installation instruction leaflet or by OSO Hotwater UK Limited under their responsibility as the product manufacturer including that required by their warranty using components supplied by OSO Hotwater UK Limited 12 3 The system may be drained through the drain valve 12 4 After maintenance it is important to recommission the system correctly see section 18 12 5 When the system is used in buildings subject to the Health and Satety 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
40. o the system Electronic Cop 8 Effect on water quality and prevention of waste of water The system is manufactured from materials and components listed in VWRc s Water Fittings and Materials Directory and will have no detrimental effect on water quality Under normal operating conditions the system will remain watertight and the integral expansion system will prevent expansion to waste provided adequate maintenance is carried out see section 12 9 Watertightness The storage cylinder remains watertight at pressures in excess of 1 5 times the design pressure ie factory tested to 16 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 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 a inspects and cleans the line strainer b recommissions the system in accordance with the manufacturer s instructions see section 18 12 2 The replacement or servicing of components must be carried out by a competent person using the OSO installation instruction leaflet or by OSO Hotwater UK Limited under their responsibility as the product manufacturer including that required by their warranty using components sup
41. of water 50 volume of water 85 pressure lt 2 bar volume of air 17 volume of water 83 4 General 4 1 The OSO 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 The water supply should be capable of maintaining a minimum cylinder pressure of 0 5 bar during draw off To maintain this dynamic pressure and adequate availability of hot water to each draw off point it is recommended that when the static pressure is less than 2 bar at least metre of 15 mm diameter pipe be incorporated in the pipe run to each draw off point 4 4 Itis 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 4 5 The data shown in Table 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 mai
42. ollowed 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 1 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 the vacuum relief valve is effective in preventing reduced pressure within the system 6 6 The system s pressure control devices will ensure that the operating pressure will be controlled to a nominal 2 bar and that the design pressure is not exceeded Each storage cylinder has been satisfactorily pressure tested to twice the design pressure ie 16 bar 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 Electrical safety 6 9 The direct thermostat and the non selt resetting thermal cutout are approved by BEAB to BS 3955 1986 The immersion heater is approved by BEAB to BS EN 60335 2 73 1997 To ensure safety it is essential that the electrical wiring is carried out in accordance with BS 7971 1092 7 Properties in relation to fi
43. plied by OSO Hotwater UK Limited 12 3 The system may be drained using the drain valve 12 4 When the system is used in buildings subject to the Health and Satety 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 thermostats non selfresetting thermal cutouts motorized valve and the immersion heater s 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
44. r at 1 bar cold feed open hot tap closed water cold pressure bar volume of air 25 volume of water 75 stage cylinder at cold supply pressure cold feed open hot tap closed water cold max pressure 2 bar volume of air 17 volume of water 83 stage 2 water heated cold feed open hot tap closed water heated cylinder air bubble compresses pressure lt 3 5 bar volume of air 15 stage 3 hot water drawn off to stage 1 level cold feed open hot tap open water level drops to stage 1 level no cold water fed into cylinder water hot water cold pressure O bar volume of air 50 volume of water 50 volume of water 85 pressure lt 2 bar volume of air 17 volume of water 83 4 General 4 The OSO 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 required from 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 to the inclusion of a primary circuit by pass to prevent excessive pressure on the moto
45. r glass wool 40 mm thick 3 Combined pressure reducing value set at 2 bar balanced cold take off 22 mm blanked and line strainer with a 22 mm diameter inlet compression fitting to BS 864 2 1983 4 Combined check valve and expansion valve Expansion valve set at 8 bar 5 Combined temperature and pressure relief valve The valve has a set temperature of 90 C and a pressure of 10 bar Factory itted 6 Tundish 22 mm connection 7 Immersion heater to BS EN 60335 2 73 1997 wired to ZA thermostat non self resetting thermal cutout to BS 3955 1986 Thermostat set to a temperature of 60 C and the cutout is designed to operate when the stored water reaches 85 C 8 Hot water draw off connection 22 mm diameter 9 Combined secondary return commissioning connection Yo BSP female O Drain valve to BS 2879 1980 1988 Cold supply connection 3 4 BSP female elbow 34 BSP male by 22 mm compression fitting to BS 864 2 1983 Cable entry glands Primary flow connection 34 BSP female Primary return connection 34 BSP female A KR WN Motorized valve 22 mm diameter compression fittings to BS 864 2 1983 wired to the non self resetting thermal cut out designed to operate when the stored water reaches 85 C 6 Electrical box 7 Tee piece 8 Flexible hose 9 Discharge pipe 20 Cold feed pipe NB Items 3 4 6 10 11 15 17 and 18 are supplied separately for fitting by a competent per
46. rall height 720 900 1150 1400 1600 2090 overall diameter 580 580 580 580 580 580 weight of cylinder kg emply 34 40 48 60 64 82 full maximum 150 187 243 303 349 462 connection sizes mains water supply to control valves mm 22 22 22 22 22 22 cold water inlet to unit 22 22 22 22 22 22 hot water draw off mm 22 22 22 22 22 22 expansion valve discharge mm 15 15 15 15 15 15 tundish outlet 22 22 22 22 22 22 immersion heater rating at 240 V kW 3 3 3 3 3 3 number of heaters 1 2 2 2 2 2 heater length mm 480 480 480 480 480 480 1 The 100L and 125L capacity are also available as Slimline cylinders The 2ORD 100SL and 125SL Slimline cylinders are fitted with 2 kW immersion heaters and will take 50 longer to heat than the standard units listed in Table 3 columns A D and E 2 The 250L and 330L cylinders can also be supplied with 1 BSP cold inlet and hot supply connections The 20RD 250FI and 330FI cylinders will deliver approximately 50 more water per minute than the standard cylinders shown in Figure 4 Flow rates Table 2 Labels General 1 The BBA identification mark incorporating the number of this Certificate 2 The system uses BEAB British Electrotechnical Approvals Board or CE approved electrical controls 3 UKWEBS United Kingdom Water Fittings Byelaws Scheme list number Manufacturer s name Produce code number Order number and year of manufacture The system is an unvented system NOURA
47. re 7 1 The rigid polyurethane foam insulation applied to the cylinder is combustible but is difficult to ignite When installing the system care should be exercised in the presence of a source of ignition such as plumber s blowlamp as the foam will flame locally and emit toxic fumes Flaming and fume emission will stop when the source of ignition is removed 7 2 The glass wool insulation material and outer casing are not easily ignited and will not contribute significantly to any fire 7 3 In service normally the cylinder will be enclosed 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 manufactured from materials and components listed in VVRc s Water Fittings and Materials Directory and will have no detrimental effect on water quality Under normal operating conditions the system will remain watertight and the integral expansion system will prevent expansion to waste provided adequate maintenance is carried out see section 12 9 Watertightness The storage cylinder remains watertight at pressures in excess of 1 5 times the design pressure ie factory tested to 16 bar 10 Noise The system is quiet in normal operation the flow of water being via conve
48. res and where the water is heated by means other than offpeak electricity must be used in conjunction with a time switch to shut off the supply of heat when the building is not occupied See the marked parts of section 5 of each system Detail Sheet Regulation F6 Insulation of pipes ducts and hot water storage vessels Comment The systems will satisfy the requirements of this Regulation Regulation P5 Unvented hot water storage systems Comment The systems incorporate suitable safety devices to meet the requirements of Regulation P5 See sections 6 and 15 4 of ach system Detail Sheet Regulation P6 Deemed o satisty provisions for an unvented hot water storage system Comment When installed in accordance with this Certiticate the systems will meet the deemed to satisty provisions of Regulation P 4 The Health and Safety at Work etc Act 1974 and the Health and Safety at Work Northern Ireland Order 1978 In buildings subject to this Act and Order regular maintenance is a requirement See section 12 of each system Detail Sheet 5 Water Byelaws England Wales and Scotland and the Water Regulations Northern Ireland England and Wales The hot water storage systems satisfy the current requirements of the Water Byelaws Scotland The hot water storage systems satisfy the Water Byelaws issued by the Regional Authorities Northern Ireland The hot water storage systems satisfy the Water Regulations Northern Irelan
49. rized valve and also safeguard against nuisance tripping 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 The water supply should be capable of maintaining a minimum cylinder pressure of 0 5 bar during draw off To maintain this dynamic pressure and adequate availability of hot water to each draw off point it is recommended that when the static pressure is less than 2 bar at least metre of 15 mm diameter pipe be incorporated in the pipe run to each draw olf point 4 4 It 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 4 5 The data shown in Tables 3 and 4 of the Detail Sheet represent the analysis of tests carried out by the BBA Slight variations in the results occur with changes in the water mains supply pressure 5 Hot water storage and supply Hot water storage 5 1 The capacities of the system range are comparable with conventional systems see Table 1 When heated to 60 C the system can supply 70 of the storage capacity at the mean temperature given in Table 3 Electronic Copy Figure 3 Schematic layout hot draw off combined temperature and pressure relief valve and anti vacuum
50. rized 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 Electronic The following is a summary of the technical investigations carried out on the OSO 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 and expansion vessel to an internal hydrostatic pressure of 1 5 times the design pressure 15 bar factory tested to 16 bar resistance fo partial vacuum of O 1 bar absolute 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 integral expansion system 19 3 Tests were carried out to confirm satisfactory operation of the following components when fitted in a system cold water control valv
51. ronic Copy England and Wales Approved Document L Section 3 2 Scotland Regulation 22 Standard J5 3 Northern Ireland Technical Booklet F paragraph 3 3 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 Heat loss Energy losst ref W kWh 24h 100 73 1 75 125 74 1 78 170 85 2 04 210 102 2 45 250 118 2 83 330 200 4 80 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 EN 1057 1996 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 4 Excessive temperature Prevention of 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 the direct nonself resetting thermal cut out fitted to the immersion heaters 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 f
52. son see Detail Sheet 2 of this Certificate volume H 100 720 125 900 170 1150 210 1400 250 1600 330 2090 SY Weary ten 2A STRE OF Table 1 Storage capacities and dimensions Electronic Copy Manufacturer s system reference 100 1250 170 210 250121 33012 storage capacity litres at 2 bar 98 123 165 203 239 317 cylinder size mm height 670 850 1100 1350 1550 2040 diameter 500 500 500 500 500 500 overall height 720 900 1150 1400 1600 2090 overall diameter 580 580 580 580 580 580 weight of cylinder kg emply 34 40 48 60 64 82 ull maximum 150 187 243 303 349 462 connection sizes mains water supply to control valves mm 22 22 22 22 22 22 cold water inlet mm 22 22 22 22 22 22 hot water draw off mm 22 22 22 22 22 22 expansion valve discharge mm 15 15 15 15 15 15 undish outlet mm 22 22 22 22 22 22 immersion heater rating at 240 V kW 3 3 3 3 3 3 number of heaters heater length mm 480 480 480 480 480 480 primary coil connection size BSP inches 34 3 3 3 34 3 heating surface area m 0 47 0 47 0 71 0 71 0 71 0 71 1 The 100L and 125L capacity units are also available as Slimline cylinders The 2ORI 1OOSL and 125SL Slimline cylinders are fitted with one 2 kW immersion heater and will take 50 longer to heat than the standard uni
53. ss round copper tubes for water and gas in sanitary and heating applications BS EN 10088 Stainless steels BS EN 10088 2 1995 Technical delivery conditions for sheet plate and strip for general purposes BS EN 60335 Specification for satety of household and similar electrical appliances BS EN 60335 2 Particular requirements BS EN 60335 2 73 1997 Fixed immersion heaters MOAT No 38 1986 The Assessment of Unvented Hot Water Storage Systems and the Approval and Surveillance of Installers La BRITISH A TECHNICAL APPROVALS FOR CONSTRUCTION On behalf of the British Board of Agr ment Date of Fourth issue 28th June 2001 e Hern ee Chief Executive Original Detail Sheet 4 issued 6th June 1994 This revised version includes update of Standards reference to Slimline cylinders and addtional connection details Electronic Copy British Board of Agr ment 2001 tot Saat or aramona 5300 P O Box No 195 Bucknalls Lane TF NS For information about Agr ment Garston Watford Herts WWD25 9BA email mail bba star co uk Certificate validity and scope tel ITISH Fax 01923 665301 website www bbacerts co uk BBA ta Hotline 01923 665400
54. t 10 C 3 bar 50 2 50 2 bar 2 8 bar a n E J Nbr a 2 bar g 5 30 3 30 n 1 bar 20 20 2 3 5 10 10 a 34 values values O 10 20 30 40 50 O 10 20 30 40 50 60 70 flow available litres min at entry to system flow available litres min at entry to system Notes Flow rates shown apply to situations where the supply is capable of supplying an adequate dynamic pressure The graph represents the results of tests carried out by the BBA Where static water supplies are less than 1 bar consult OSO Hotwater UK Limited or the BBA 1 Static supply pressures of incoming water supply Flow rates column B of Table 3 the mean temperature of 70 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 pressure and the maximum hot water flow rate out of the system 1 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 Heat up re heating and hot water draw off temperature
55. tisfactorily pressure tested to twice the design pressure ie 16 bar 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 Electrical safety 6 9 The indirect thermostat non seltresetting thermal cutout and motorized valve and the direct thermostat and non seltresetting thermal cutout are approved by BEAB to BS EN 60335 2 73 1997 To ensure safety it is essential that the electrical wiring is carried out in accordance with BS ZOZ 1992 7 Properties in relation to fire 7 1 The rigid polyurethane foam insulation applied to the cylinder is combustible but is difficult to ignite When installing the system care should be exercised in the presence of a source of ignition such as plumber s blowlamp as the foam will flame locally and emit toxic fumes Flaming and fume emission will stop when the source of ignition is removed 7 2 The glass wool insulation material and outer casing are not easily ignited and will not contribute significantly to any fire 4 7 3 In service normally the cylinder will be enclosed 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 t
56. ts listed in the direct heating of Table 3 columns A and D 2 The 250L and 330L cylinders can also be supplied with 1 BSP cold inlet and hot supply connections The 2ORI 250FI and 330FI cylinders will deliver approximately 50 more water per minute than the standard cylinders shown in Figure 4 Flow rates Table 2 Labels General 1 The BBA identification mark incorporating the number of this Certificate 2 The system uses BEAB British Electrotechnical Approvals Board or CE approved electrical controls 3 UKWEBS United Kingdom Water Fittings Byelaws Scheme list number 4 Manufacturer s name 5 Product code number 6 Order number and year of manufacture 7 The system is an unvented system Design 1 Maximum water supply pressure bar 2 Operating pressure bar 3 Expansion valve setting bar 4 Storage capacity litres 5 Weight of system full kg Safety warnings conditions 1 Installation to be carried out only by a competent person 2 The removal replacement of any component to be carried out only by a competent person using components supplied by OSO Hotwater UK Limited in accordance with their instructions 3 Any malfunction of the system such as that resulting in discharge of water to the tundish from the combined temperature and pressure relief valve to be reported to a competent person after switching off the heat source and prior to any further use of the system 4 The
57. us satisfy this Standard Regulations 27 and 28 Miscellaneous hazards Standard P2 6 Discharge of steam or hot water Comment When installed in accordance with the recommendations of this Certificate the systems will satisfy the requirements of this Standard See section 6 of each system Detail Sheet Standard Peil Unvented hot water storage system Comment The systems are constructed so as to prevent the temperature of the stored water at any time exceeding 100 C and to provide adequate protection from malfunction of the system See section 15 3 Readers are advised to check the validity of this Certificate by either referring to the Index of Current BBA Publications or contacting the BBA direct Telephone Hotline 01923 665400 Electronic Copy 3 The Building Regulations Northern Ireland 1994 as amended 4 In the opinion of the BBA the position of OSO Unvented Hot Water 345 Storage Systems if used in accordance with the provisions of this Certificate will satisfy the various Regulations as listed below Regulation B2 Fitness of materials and workmanship Comment The systems are acceptable Regulation F4 Control of space heating and hot water supply systems Comment The systems are fitted with a thermostat meeting the requirements of this Regulation To comply with the deemed o satisfy provisions set out in Technical Booklet F 1991 Conservation of fuel and power Section 2 systems having a capacity of more than 150 lit

Electronic Copy - RIBA Product Selector

Contents

Download Pdf Manuals

Related Search

Related Contents