Technical and Installation manual All Models
Contents
1. 27 5 2 Handing Over 28 6 SERVICING gt Section 6 Servicing 6 1 Routine Service 29 7 FAULT FINDING gt Section 7 Fault Finding 7 1 Fault Finding 30 IMPORTANT BEFORE STARTING THE INSTALLATION OF THE DUALSTREAM CHECK ALL COMPONENTS HAVE BEEN DELIVERED AND ARE IN SATISFACTORY CONDITION Dua ream Introduction Note It is recommended to obtain the nominal mains pressure and flow rate before installing a Dualstream system this will enable the optimum system to be configured to suit conditions Note Direct cylinder heated by immersion heater Indirect cylinder heated by boiler also has immersion heater Note For components supplied with system refer to page 24 This Handbook has been compiled to assist in the Installation and Operation of GAH HEATING PRODUCTS LIMITED Dualstream domestic hot and cold water system After installation the Installer of the system should give full operating instructions to the householder for the Dualstream System 1 1 1 The Dualstream System The Dualstream systems by GAH Heating Products have been developed as an advanced solution for domestic hot and cold water installations A Dualstream system will increase the water volume and maintain the mains pressure to both the hot and cold supplie2. INTRODUCTION 1 1 2 3 Typical Twin Coil Cylinder Layout SOLAR COLLECTORS Ir SOLAR SYSTEM CONTROL Ql lt 5 AUXILIARY HEAT TNN GOIL m SOURCE BOILER ACCUMULATOR CYLINDER V TYPICAL SOLAR W ATER HEATING SYSTEM Q QC AUXILIARY HEAT lt 7 SOURCE BOILER RETURN r PRIMARY HEAT GAH Heating Products Ltd supply a range of Solar Water Heating Systems that compliment the GAH Dualstream System For further details consult GAH AUXILIARY HEAT SOURCE BOILER UNVENTED TWIN COIL CYLINDER T HOT WATER HTPV SLEY M BALANCED COLD SUPPLY JE T 0 TAPS LS SOURCE SOLAR FLOW All installations must comply with relevant regulations refer to section 4 1 A x Fig 1 2 Twin Coil Cylinder Application System Requirements Note The accumulator model is designated as its gross volume the actual water content of the accumulator is up to 65 of its gross volume 1 3 1 Sizing of System The size of the Dualstream system is determined by the capacity of the accumulator and cylinder models selected As the accumulator provides the pressure for the system it is important that this is of adequate size The accumulator water content is up to 65 of its gross volume When sizing the Dualsteam system close consideration should
3. Duabtrea Specifications TECHNICAL INFORMATION 3 3 1 1 Cylinder Maximum Water Supply Pressure 6 0 Bar Operating u iia has enna 3 5 Bar HTPR Valve tenete tnnt nennen 7 0 Bar 90 C Cylinder Thermostat range 30 C to 85 C Recommended Setting sss 60 C max Thermal Cut Qut au isesi nuitia sassa fixed 90 C Immersion Heater nn aaa aaa VONAGE 240V Direct 125 150 210 300 nettes 2 x 3kW Indirect 125 150 210 30l eee 1x3kW PVC T 1x6kW Thermal UL r u taie fixed 90 C Motorised Valve V4303 Protech Anti corrosion unit TDI 500 amp TDD 500 only non stainless steel only 240V 3amp 3 1 2 Accumulator MEmMDrANE 5 Butyl for potable water Maximum preSSul ir e t bene erbe eee ees 7 0 Bar Minimum 0 5 0 8 Factory set pressure z u un u 2 Bar 3 1 3 Pipes All pipes should be sized to suit application 3 1 4 Electrics All systems are supplied for 240V SINGLE PHASE On 500 Cylinders the Immersion Heaters can be converted to 3 Phase consult GAH HEATING PRODUCTS LIMITED for further information 12 Direct Indirect Cylinder model ed x a 2 el TDD2
4. WATER CONTROL setting the standards Technical and Installation manual All Models Duabtream CONTENTS Section 1 Introduction 1 1 Introduction 1 2 System Layout q 1 3 System Requirements Section 2 Operator Controls 2 1 Hot Water Temperature Heating System 2 2 Hot Water Temperature Immersion Heater 2 3 Hot Water Overheating 2 4 Shut Off Valves 2 5 Expansion Relief 11 2 6 Servicing 11 2 7 Protech Anti corrosion System 11 Section 3 Technical Information 3 1 Specifications 12 3 TECHNICAL INFORMATION gt 3 2 Dimensions 13 3 3 Wiring 15 4 INSTALLATION gt Section 4 Installation 4 1 Building Control 17 4 2 Installation 17 4 3 Expansion Discharge 20 4 4 Larger SySlemS q 22 n pee s s 2 5 COMMISSIONING gt 4 6 Parts Supplied 24 Section 5 Commissioning 5 1 Commissioning Checks
5. k the stop cock and any valves on the mains supply are fully open k the combination valve line strainer is not blocked clean if required k line strainers and any other fittings are not blocked clean if required k there is power to the indirect heating system boiler and or the cylinder immersion heater Chec Chec k fuses for indirect heating system and or the cylinder immersion heater k cylinder thermostat is installed and set correctly Please consult your installer In the unfortunate event of a water leak from the Dualstream cylinder or accumulator TURN OFF ELECTRIC SUPPLY then turn off the mains water supply to the house via the stop cock Make allowance to store some cold water for necessities Open both cold and hot taps to drain the cylinders of water thus preventing any further leaks and consult your installer Poe qo SS Chec Chec Chec Chec Chec 4 4 Chec k to ensure combination valve filter is not blocked k all isolation valves are fully open k accumulator charge pressure is not too high refer to 4 4 k pipework from accumulator is of adequate size k accumulator charge pressure is not set too high Re set pressure as section k to make sure there is air in the accumulator If air is not present suspect faulty accumulator consult GAH HEATING PRODUCTS Chec Chec Indirect cylinder coils may be fractured consult GAH Heating Products k mains supply it may have been interru
6. 150 210 300 Fig 4 2e Splitting Combination Valve Cylinders 500 4 2 4 Expansion Vessel As the Dualstream Accumulator acts as the system expansion vessel an independent expansion vessel system is not normally required However if the alternative Dualstream configuration shown in 1 2 2 is adopted or an independent expansion vessel not supplied by GAH is specified it should be fitted to the domestic hot water system It is recommended to connect the expansion vessel to the Combination Valve which has a BSP port provided for this The expansion vessel must always be open to the system with NO shut off or isolation valves in the connection pipe b BSP PORT FOR EXPANSION VESSEL BSP PORT FOR L EXPANSION VESSEL Fig 4 2f Expansion Vessel Connection Cylinders 125 150 210 300 L Fig 4 2g Expansion Vessel Connection Cylinders 500 Duabtream Note As Dualstream is a sealed system the pressure at the taps is not affected by the height of the cold water storage GAH offer a range of quality Water Softeners for information contact GAH Heating Products 20 4 2 5 Accumulator The accumulator may be installed at any convenient location within the dwelling outhouse garage loft or basement In normal circumstances the accumulator should be installed vertically Where this is not possible accumulators up to 240 can be installed horizontally by supporting it in
7. 210 amp 300 CYLINDERS Capacity 125 litres Coil Surface 45 TPRV HOT WATER TO TAPS 22mm COLD MAINS SUPPLY YT IN 22mm D I 1 3 1 cH 2 e 8 1 4 L BOILER FLOW 22mm EXPANSION DISCHARGE de EN D Taps 22mm a x 4 RETURN 22mm U U m Y 4 ror water TAPS 28mm COLD MAINS SUPPLY 28mm 500 maximum R FLOW 28mm EXPANSION A DISCHARGE BOILER RETURN 28mm 500 CYLINDERS TDI 150 150 litres TDI 210 210 litres TDI 300 300 litres S Inn 2s dem TDI 500 TDD 125 495 litres 125 litres TDD 150 150 litres TDD 210 210 litres TDD 300 300 litres TDD 500 495 litres Fig 3 2b Standard Cylinder Dimensions 14 Duabtream TECHNICAL INFORMATION 3 2 3 Indirect Twin Cylinder Dimensions 2 COMPRESSION FITTINGS ARE SUPPLIED TO ADAPT THE CYLINDER TAPPINGS TO THE PIPE SIZES SHOWN TWIN COIL CYLINDER ARE USED FOR SOLAR WATER HEATING APPLICATIONS SEE 1 2 3 BOILER FLOW 22mm HOT WATER TO o 2 TAPS 22mm COLD MAINS SUPPLY IN 22mm 500 maximum BOILER RETURN 22mm lt DISCHARGE PRIMARY HEAT SOUCE FLOW SOLAR COLD TO TAPS 22mm PRIMARY HEAT
8. 500 Cylinder DOMESTIC HOT WATER 28mm FROM MAINS 28mm DOMESTIC COLD WATER 28mm i ACCUMULATOR SECONDARY DOMESTIC COMBINATION HOT WATER E PLUGGED TUNDISH DISCHARGE BOILER FLOW 28mm e 9 MOTORISED VALVE CYLINDER THERMOSTAT INTO CYLINDER NN CYLINDER DRAIN COCK TO ACCUMULATOR 28mm ACCUMULATOR DRAIN COCK TO BE FITTED BOILER RETURN 28mm Domestic Hot Water 28mm Fit 28mm ball valve supplied Domestic Cold Water 28mm Fit 28mm ball valve supplied Mains supply 28mm Fit28mm ball valve supplied Tundish Discharge to be arranged and sized to comply with Building Regulations Boiler Flow 28mm Indirect only 28 x 3 4 Coupler supplied Fit Motorised Valve supplied Boiler Return 28mm Indirect only 28 x 34 Coupler supplied Fig 4 6b Typical Dualstream Connections 27 Duabtrea Commissioning Checks 28 m amp ARISTON Benchmark The code of practice for the Inst Wi amp servicing of mains pressure hot water storage Installation Commissioning and Service Record Log Book IMPORTANT It is the responsibility of the installer to ensure that the Dualstream System is properly commissioned Should the commissioning not be carried out then the manufacturers guarantee and any extended warranty will become null and void The Guarantee For
9. SOUCE FLOW SOLAR Cylinder DIMENSIONS Model D ITS 210 ITS 300 Cylinder Capacity Autom Sol Top ol Weight Weight Model Surface Rating Surface Rating Empty Full ITSI 210 200litres 0 75m 20 5kW 0 75m 20 5kW 44kg 244kg ITSI 300 300 litres 0 90m 26 7kW 0 75m 20 5kW 60kg 360kg Fig 3 2c Twin Cylinder Dimensions TECHNICAL INFORMATION EEJ Wiring 3 3 3 1 Immersion Heater 125 150 210 and 300 Cylinders EARTH green yellow HEAT SN RESISTANT E CABLE LIVE brown p lo NEUTRAL blue THERMOSTAT IMMERSION HEATER ADJUSTMENT N HEAT RESISTANT CABLE DOUBLE POLE SWITCH Fig 3 3a Immersion Heater Wiring Diagram 125 150 210 and 300 Cylinders 3 3 2 Immersion Heater 500 Cylinders JM 500 CYLINDER IMMERSION HEATERS ARE SUPPLIED L WIRED FOR SINGLE PHASE THERMOSTAT CONVERSION TO PHASE PARALLEL IS POSSIBLE With Thermal Safet CONSULT GAH HEATING PRODUCTS LIMITED ermal Safety L N Bi B2 B3 O ol ol icu BOTH PHIALS ARE INSERTED IN THIS HOLE brown 3 4 violet 900000009 Q OTTO HEATING HEAT RESISTANT CABLE ELEMENTS DOUBLE POLE SWITCH green yellow blue Fig 3 3b Immersion Heater Wiring
10. a basement providing that the expansion relief discharge pipe is plumbed to a metal receptacle with a suitable pump and switch arrangement current Building Regulations give details of this An alternative is to use a Hepworth 0 Self Sealing Waste Valve this must be installed to the manufacturers specification and building regulations 4 2 2 Cylinder Thermostat The combined Cylinder Thermostat and Thermal Cut Out Thermostat supplied should be inserted into the socket provided in the cylinder A screw is provided to clamp the unit in place Wire the unit as wiring diagram 3 3c Duabtream 4 2 3 Combination Valve The Combination Valve is supplied pre assembled with pipework to the unvented cylinder For standard configurations as shown in 1 2 1 this should remain in situ N 7 22mm SUPPLY 28mm SUPPLY FROM MAINS FROM MAINS 3 5 PRESSURE 3 5Bar PRESSURE REDUCING VALVE REDUCING VALVE EXPANSION RELIEF Set at 6 bar 22mm SUPPLY TO 0 owe 28mm SUPPLY TO CYLINDER et at 6 bar AND ACCUMULATOR Fig 4 2b Combination Valve Cylinders 125 150 210 300 Fig 4 2c Combination Valve Cylinders 500 M For alternative systems as shown in 1 2 2 it is recommended to split the Combination Valve and fit the 3 5 Bar Reducing Valve section onto the incoming mains supply as shown in fig 1 2b MAINS SUPPLY Fig 4 2d Splitting Combination Valve Cylinders 125
11. and the combination valve PRV should be plumbed to the tundish supplied installation must comply with building regulations Three full bore lever valves are supplied it is recommended to install these one each incoming mains to combination valve hot supply from cylinder cold supply from accumulator Duabtream SPLI TAP HEATING SYSTEM CHEN FILL K COLD TAP WATER INCOMING m SOFTENER MAINS SUPPLY INTRODUCTION 1 1 2 2 Alternative Layout All installations must comply with relevant regulations refer to section 4 1 UNVENTED CYLINDER HOT WATER HTPV SUPPLY TO TAPS x L VAEN i expansion 0 TAPS VESSEL v DOUBLE CHECK VALVE 3 5 Bar PRESSURE REDUCING VALVE i D RAIN D BOILER w RETURN EXPANSION DISCHARGE Fig 1 2b Schematic Installation Alternative Arrangement Note The expansion vessel is not supplied with the Dualstream system GAH Heating Products can supply expansion vessels if ordered with the Dualstream system Fig 1 2b shows a typical configuration of a Dualstream system when the accumulator has to be installed at a distance away from the hot water cylinder The Combination valve is supplied factory assembled to the unvented hot water cylinder For this configu
12. be given to the following 1 Incoming mains supply pipe size Incoming mains flow and static pressure House type building height and number of occupants Typical daily water usage and peak demands Number of bathrooms and total number hot and cold water outlets Types of shower taps and baths and the volume and pressure of water to operate them Ome co n5 Size of Dwelling Flat Smaller House The following chart is given as a guide only Small House Medium House Larger House Large House Usage Kitchen 1 2 Bedrooms 1 Bath amp Shower Kitchen Cloakroom 2 3 Bedrooms 1 Bath amp Shower Kitchen Cloakroom 4 5 Bedrooms 2 Baths amp Showers Kitchen Cloakroom Utility Room 4 6 Bedrooms 2 Baths amp Showers Kitchens Cloakrooms Utility Rooms Multiple Beds 4 5 Baths amp Showers Preferred Accumulator Model 100 200 240 200 240 300 240 300 500 300 500 500 2 x 500 Preferred Cylinder Size Note 125 The accumulator model is designated as its gross volume the actual water content of the accumulator is up to 65 of its gross volume GAH offer a range of quality Water Softeners for information contact GAH HEATING PRODUCTS 150 GAH offer full techn system to be contig 210 are considered a problem 1 3 2 Central Heating System The Dualstream system does not affect the central heating installation However
13. black Immersion Heater cover The temperature range is 30 C to 85 C Recommended setting is 60 C Fig 2 2a shows the approximate setting position for 60 C The Immersion Heater has a Thermal Cut Out refer to 2 3 1 WARNING ALWAYS ISOLATE THE IMMERSION HEATER BEFORE REMOVING COVER When the cover is removed electrical live terminals are exposed Fig 2 2b 500 Immersion Heater Adjustment 2 2 2 Hot Water Control 500 Cylinders When the hot water is heated by the electric water at the taps is controlled by the Immers adjusting knob located on top of the plastic The temperature range is 30 C to 85 C Recommended setting is 60 C Immersion Heater the temperature of the hot ion Heater Thermostat which has an mmersion Heater cover MANUAL RESET BUTTON Fig 2 3a Thermal Cut Out Thermostat 2 3 1 Water Heated by Heating System When the hot water is heated by the heating system a Thermal Cut Out Thermostat prevents the water within the cylinder overheating In the event of the water temperature within t trip and close the motorised valve shutting o 2 34 The Thermal Cut Out Thermostat is a manua he cylinder reaching 90 C the thermostat will ff the flow from the heating system see fig reset type this means it has a button that pops out when the thermostat has been tripped by overheating To reset the system after overheating allow ti m
14. installed disconnect from the Dualstream components and flush all pipework thoroughly When connecting to existing pipework remove all unwanted components create new pipe runs then flush thoroughly before connecting to the Dualstream components 4 2 8 Dualstream Components All Dualstream components and pipework are checked at the factory prior to dispatch however always check the connections for leaks on commissioning as transportation and installation can cause joints to move Duabtream Expansion Discharge gt AIR BREAK DISCHARGE PIPE Fig 4 3a Tundish Note The TPRV and PRVs must not be used for any other purpose WARNING Scalding water and steam can be blown out of the discharge pipe Position the discharge so that it is not a hazard to property or people especially children 4 3 1 Tundish The Tundish must be vertical and fitted within 500mm of the temperature and pressure relief valve and must be located with the cylinder The tundish must also be in a position visible to the occupants and positioned away from any electrical devices The discharge pipe from the tundish should terminate in a safe place where there is no risk to persons in the vicinity of the discharge and to be of metal 4 3 2 Expansion Discharge Self Sealing Valve A Hepvo Self Sealing Valve is available as an option this enables alternative discharge arrangements to be used however its use and ins
15. or accumulators must have frost protection when they are installed where low temperatures could be a potential problem Cylinders can be protected by a frost thermostat To comply with Building Regulations all necessary pipework must be suitably lagged Duabtream OPERATOR CONTROLS 2 Hot Water Temperature Heating System Note For 500 Cylinders see 2 2 2 2 1 1 Hot Water Control Heating System When the hot water is heated by the heating system the temperature of the hot water at the taps is controlled by the Cylinder Thermostat This controls a motorised valve that opens and closes the flow from the heating system The temperature range is 30 C to 85 C Recommended setting is 60 C LOWER eg HIGHER MOTORISED VALVE CYLINDER 05 SHOWN 60 APPROX THERMAL CUT OUT SAFETY THERMOSTAT FLOW FROM HEATING SYSTEM z L IMMERSION HEATER T DOUBLE POLE SWITCH Fig 2 1a Typical Hot Water Control Hot Water Temperature Immersion Heater Fig 2 2a Immersion Heater Thermostat N 2 2 1 Hot Water Control 125 150 210 amp 300 Cylinders When the hot water is heated by the electric Immersion Heater the temperature of the hot water at the taps is controlled by the Immersion Heater Thermostat This is located under the
16. 10 TDI210 TDD300 TDI300 Immersion Heater Size 240V 2x3kW 240V 1 x 3kW 240V 6kW Recommended Fuse Rating 2 x 13 amp 13 amp 30 amp Recommended Cable Size 2 x 2 5mm 2 5mm 6 0mm Protech N A N A 240v Protech Recommended Cable Size N A N A 1 5mm Protech Recommended Fuse Rating N A N A 3 amp Dual Dimensions 3 2 1 Accumulator Dimensions 100 PRE CHARGE VALVE SCHRAEDER H2 H TEE 28 28 28 COMPRESSION FITTING c P SEES COMPRESSION FITTINGS BASE VENTED TO PREVENT CONDENSATION amp FLOOR FIXING Accumulator Size Maximum H Model Gross Capacity Water Content 00 i bp Weight Empty 100 100 up to 65 litres 410mm 890mm 990mm 16 3kg 200 170 up to 110 litres 535mm 940mm 1040mm 30 4kg 240 240 up to 156 litres 535mm 1215mm 1315mm 37 2kg 300 310 up to 198 litres 535mm 1500mm 1600mm 44 5kg 500 450 up to 292 litres 668mm 1530mm 1630mm 69 5kg Water content is up to 65 of the accumulator volume Total weight weight empty water content 1kg litre Fig 3 2a Accumulator Dimensions Duabtream 3 2 2 Standard Direct and Indirect Cylinder Dimensions COMPRESSION FITTINGS ARE SUPPLIED TO ADAPT THE CYLINDER TAPPINGS TO THE PIPE SIZES SHOWN AX 699 Cylinder Model TDI 125 aa niu TO X 125 150
17. 28mm compression 4 Motorised Valve 1 For boiler flow to cylinder Cylinder Stat amp 5 Thermal Overload 1 For cylinder Stat 2 for cylinder boiler Flow and 1 for cold feed to cylinder 7 1 For incoming mains Valve 9 1 for domestic hot water 8 28 Ball Valves 3 1 for domestic cold water 1 for cold feed to the cylinder 25 Dua ream 4 6 3 Connections to Dualstream 125 150 210 and 300 Cylinders UNVENTED CYLINDER HTPR VALVE HOT WATER SECONDARY DOMESTIC HOT WATER PLUGGED TUNDISH DISCHARGE Domestic Hot Water Domestic Cold Water Mains supply Tundish Boiler Flow Boiler Return DOMESTIC COLD WATER 22mm ACCUMULATOR COMBINATION VALVE MOTORISED VALVE BOILER FLOW 22mm 22mm 22mm 22mm 22mm 22mm CYLINDER THERMOSTAT BOILER RETURN 22mm TO ACCUMULATOR 22mm pls DRAIN COCK TO BE FITTED COLD INTO CYLINDER Fit 22mm ball valve supplied Fit 22mm ball valve supplied Fit 22mm ball valve supplied Discharge to be arranged and sized to comply with Building Regulations Indirect only 22 x 34 Coupler supplied Fit Motorised Valve supplied Indirect only 22 x 34 Coupler supplied Fig 4 6a Typical Dualstream Connections 26 Duabtream 4 6 4 Connections to Dualstream
18. Diagram 500 Cylinder Duabtream TECHNICAL INFORMATION 3 3 3 3 Cylinder Thermostats HIGH LIMIT CYLINDER THERMOSTAT THERMOSTAT ormally Closed Normally Closed HONEYWELL V4043H Normally Closed gt H e FLOW FROM BOILER orange Not required NOT USED Can be used for or PUMP hot water heated light depending on System NEUTRAL orange SWITCHED LIVE from 1 BOILER HEATING CONTROLS Fig 3 3 Cylinder Thermostats Wiring Diagram 125 150 210 and 300 Cylinders 3 3 4 Protech Anti corrosion System 500 non stainless steel only 240V 3amp PERMANENT SUPPLY Fig 3 3d Protech Anti corrosion System Wiring Diagram Dua ream Building Control Note some areas it is a criminal offence to install an unvented hot water storage system without notifying the local authority or without the relevant licence Note GAH offer full unvented training packages contact GAH HEATING PRODUCTS installation To install a Dualstream System the installer must be fully competent suitably qualified and hold a relevant unvented certificate and any applicable licence that may be required by the local inspectorate for installation of an unvented hot water storage system In some areas the Local Authority may require notificati
19. G PRODUCTS LIMITED reserve the right to change any boiler part or design without notice therefore certain details included in this manual may not be correct at the time of printing Any modification and improvements detailed in this manual does not commit GAH to update any system previously supplied Manual Part No 015 15011 Manual Ref DS06 9 Date Dec 2006 Patents GB 2349908 2006 GAH HEATING PRODUCTS LTD Dualstream is a Trademark of GAH HEATING PRODUCTS LTD HTS REF HDUALO6 0206 23 02 06 Manual by Harber Technical Services Tel Fax 01986 781605 E mail info harbertech co uk www harbertech co uk OTHER MATERIALS SEALANTS ADHESIVES AND PAINTS Sealants Adhesives and Paints are used in the construction of the Dualstream components When used in the manner for which they are intended they do not present any known hazard ELECTRIC All cylinders have electrical supply of 240V enough to endanger life connected to the Immersion Heater Always isolate before adjustment servicing and repair All electrical installation and maintenance of the Dualstream must be carried out by a competent qualified installer All electrical work must be installed to the requirements of these User and Installation Instructions GAH HEATING PRODUCTS LIMITED will not accept responsibility for any damage or
20. MITED jnoke7 NNW 2210 1 ep p Bly Nun 13H 831108 G d31l08 c jj 39uvHsId INA C NOISNVdX3 03H29 902 qignod 4015 2 H3ONITAO X L H3dNITA9 I KlddflS s T dvi f TSS 0109 NS 15 6 N3HOLDI 9NLLV3H dvi 3019110 SdV1 OL AlddNS 0102 GAONVIVE L T3SS3A NOISNVdX3 L 13SS3A NOISNVdX3 X X SdV1 OL AlddNS LOH A 140d NYNLIY 0235 T J VIA Q3193NNOO SH3QNITAO KINO 39N3H333H 803 23 Dual System Pressure Es INCOMING MAINS SUPPLY MAINS PRESSURE gt SYSTEM PRESSURE BALANCED COLD SUPPLY TO TAPS UNVENTED CYLINDER HOT WATER SUPPLY TO TAPS PRESSURE REDUCING VALVE set at 3 5 Bar INTEGRAL NON RETURN VALVE lt BOILER FLOW 5 5 PRESSURE BOILER RETURN DRAIN Fig 4 5a Pressure Diagram 24 Notes on Pressures 1 The additional pressure reducing valve is not normally required on standard systems The Combination Valve has an integral pressure reducing valve fixed at 3 5 bar therefore th
21. OW SINK COLD 2 Je WATER INCOMING S SOFTENER MAINS SUPPLY DOUBLE CHECK EXPANSIO VALVE DISCHARGE If required Fig 1 2a Schematic Installation Standard Arrangement SJ Fig 1 2a shows a typical configuration of a Dualstream system when the accumulator and hot water cylinder can be installed within close proximity of each other This installation method allows for the accumulator to take up expansion from the Note unvented cylinder no further expansion vessels are required This layout will in practice be found to be the most efficient The incoming mains supply is connected to the Combination Valve which is factory assembled to the unvented hot water cylinder The Combination Valve has an integral check valve A Double Check Valve is supplied this is only required to be fitted if back syphonage is possible from any item fitted prior to the Combination Valve Provision must be made as applicable for outside tap boiler heating system fill and water softener The Combination Valve limits the incoming pressure to 3 5 bar it has an integral non return valve and pressure relief valve PRV Once passed the Combination Valve the incoming mains water supplies the accumulator and the cylinder Supply to all the cold taps and outlets is taken from the Tee fitting at the base of the accumulator Supply to the hot taps and outlets is taken from the cylinder in the traditional manner The cylinder HTP Valve
22. a cradle and ensuring provision is made to make it fully drainable The floor must give adequate support to the filled accumulator The accumulator must be protected from frost particularly when it is sited in a loft uthouse or garage 0 Note that space is required to the top of the vessel to access the pressure valve Provision must be made to enable the accumulator to be drained when required IMPORTANT The accumulator is supplied at 2 Bar pressure It is recommended to set the pressure at 1 5 Bar below the mains pressure with a minimum of 0 5 0 8 Bar see 4 5 and 5 5 1 4 2 6 Scale Protection IMPORTANT All installations should have a scale protection device fitted and in areas known to have hard water a water softening device is strongly recommended GAH recommend and promote the use of scale prevention devices and water softeners in areas that are known to have hard water Installed correctly they prolong the life of equipment and help prevent lime scale formation in the pipework Water Softeners provide the advantages of soft water as well as preventing scale build up on taps and shower heads Water softeners and any mains fed system must be of adequate capacity and should be installed with suitably sized hoses to prevent any possibility of flow reduction The location and position of the scale protection device or Water Softener should be as the manufacturers recommendations 4 2 7 Pipework When all pipework has been
23. arge Minimum size of discharge pipe to Tundish D1 from Tundish D2 The equivalent hydraulic resistance of discharge pipework needs to be calculated where the length of D2 exceeds 9m maximum for one step up in pipe size including resistance of elbows or bends The following table can be used 4 3 4 Hydraulic Resistance of Discharge Pipework Table 1 Maximum resistance allowed expressed as a length of straight pipe i e no elbows or bends Resistance created by each elbow or bend 22 up to 9m 0 8m 28 up to 18 n 1 0m 35 up to 27 n 1 4m 28 up to 9 1 0m 35 up to 18 n 1 4m 42 up to 27 n 1 7m 35 up to 9 1 4m 42 up to 18 n 1 7m 54m up to 27 n 23m 4 3 5 Worked Example G 1 2 temperature and pressure relief valve with a discharge pipe D2 having four elbows and length of 7m from the tundish to the point of discharge From Table 1 Maximum resistance allowed for a straight length of 22mm copper discharge pipe D2 from G 1 2 temperature and pressure valve is 9m Subtract the resistance for four 22mm elbows at 0 8m each 3 2m Therefore the maximum permitted length equates to 5 8m as 5 8m is less than the actual length of 7m therefore pipe D2 must be 28mm 4 e 9 A EE Larger Systems For larger systems two or more accumulators and cylinders can be linked together For more information consult GAH HEATING PRODUCTS LI
24. consideration has to be given to the best method of connection and control of the heating system to the indirect cylinder 1 3 4 Scale Protection 300 500 2 x 500 ical assistance and design service to enable the optimum Dualstream ured to overcome situations where poor mains supply and pressure IMPORTANT All installations should have a scale protection device fitted and in areas known to have hard water a water softening device is strongly recommended GAH recommend and promote the use of scale prevention devices and water softeners in areas that are known to have hard water Installed correctly they prolong the life of equipment and help prevent lime scale formation in the pipework Water Softeners provide the advantages of soft water as well as preventing scale build up on taps and shower heads Water softeners and any mains fed system must be of adequate capacity and should be installed with suitably sized hoses to prevent any possibility of flow reduction 1 3 5 Frost Protection When planning the installation location of both the accumulator and the unvented cylinder consideration must be given to the risk of frost and the use of frost protection The design of the accumulator gives it a degree of frost protection enabling it to be located within the dwelling loft space or garage without further protection The cylinder can also be installed within the dwelling or loft space without further protection Cylinders
25. d by loss of air pressure in the accumulator In the event of water steam being seen at the discharge pipe or Tundish do the following 1 Tum ON a hot tap to relieve the pressure 2 OFF the Electric Immersion Heater 3 Turn OFF the Heating System 4 Investigate possible cause for high pressure e g i Cylinder Thermostat is set too high ii Restriction in hot water pipework ii 1055 of air pressure in the accumulator resulting in no expansion 5 Contact the installer before restarting the system It is recommended the system is inspected by an approved engineer once per year The service procedure is included in section 6 1 1 Protech Anti corrosion System 500 only gt Fig 2 7a Protech Unit Fitted to TDI 500 amp TDD 500 non stainless steel cylinders only The Protech unit is an electronic anti corrosion protection system which improves the life of the cylinder The Protech unit must be permanently connected to a 240V supply at all times The unit has a RED and a GREEN light on the front The GREEN light should be on at all times this indicates proper operation When the RED light is on it indicates improper operation which could be 1 A short circuit between the electrode and the cylinder 2 Oneofthe electrodes is not connected 3 There is no water in the cylinder Consult the installer if the RED light is on
26. d clean the expansion relief valve in the combination valve replace if required Close all drain cocks and refill system Check that no water is passing through the Combination Valve or the Pressure Relief Valves this will be evident at the Tundish Switch on the heating system Check operation of motorised valve by setting heating system to call for hot water The valve should open Then turn hot water off the valve should close Wait for the system to heat up Check temperature of tap water adjust as required max 60 C Check operation of cylinder thermostat When turned down below tank temperature the motorised valve should open When turned up above tank temperature the motorised valve should close Check for leaks again when the system is up to temperature Enter details of service into the Benchmark Logbook Duabtr Am FAULT FINDING 7 Fault Finding also see www gah co uk No COLD Water Supply Reduced Pressure No Hot Water Water Leaks Poor Flow Rate at Taps Good volume which falls away too quickly Cold water discoloured Hot water discoloured 1 2 3 Check the mains supply has not been interrupted from the main Check the stop cock and all valves on the mains supply are correctly installed Chec Chec Chec Chec Chec k the stop cock and any valves on the mains supply are fully open
27. der Thermostat and Thermal Cut Out Thermostat 3 accumulator cold water storage and associated fittings which can be positioned anywhere in the dwelling outhouse or garage refer to 4 2 6 4 AMotorised Valve for connection to the heating systems flow to cylinder 1 4 Dualstream System Features All taps and showers are at maximum System Pressure 1 1 2 Provide increased water flow rate to both hot and cold water outlets 3 Suitable for properties with very low mains flow rates 9 litres per minute 4 Balanced Hot and Cold water supply pressures 5 Minimum pressure drop when more than one tap is in use 6 than 25 less pipework than traditional systems T No loft storage tank no risk of water stagnation 8 Completely sealed system wholesome water to all cold taps 9 No tank filling noise 10 Dualstream utilises GREEN TECHNOLOGY Duabtream System Layout INTRODUCTION 1 1 2 1 Standard System ge All installations must comply with relevant regulations refer to section 4 1 HOT WATER en BALANCED UNVENTED COLD SUPPLY CYLINDER TO TAPS HTPV iD ACCUMULATOR m NN f 3 VALVE a 2 HECK VALVE wi TUNDISH L Riez rb HEATING PRV SYSTEM BOILER KITCHEN FILL R
28. e System Pressure will be 3 5 bar maximum If the Mains Pressure is less than 3 5 bar then the System Pressure will be at maximum Mains Pressure The Accumulator Pressure is factory set at 2 Bar The recommended Accumulator Pressure is 1 5 Bar below the mains pressure with an absolute minimum of 0 5 0 8 Bar consult GAH Heating Products for further information Also refer to 5 1 1 The Combination Valve has a Pressure Relief Valve PRV set at 6 Bar The unvented cylinder has a Temperature and Pressure Relief Valve PRV set at 6 Bar Duabtrea Parts Supplied 4 6 1 All models except 500 Item Part Qty Notes 1 Cylinder Pre plumbed c w Immersion Heater 2 Cylinder Feet 3 Complete with 6 screws 3 Accumulator 1 Pre plumbed 28mm compression 4 Motorised Valve 1 For boiler flow to cylinder Cylinder Stat 5 Thermal Overload Stat V Coupler 6 29mm x 34 BSP 2 For cylinder boiler Flow and Return 7 22mm Double Check 1 For incoming mains Valve 9 1 for domestic hot water 8 22 Ball Valves 3 1 for domestic cold water 1 for cold feed to the cylinder 4 6 2 500 Only Item Part Qty Notes Pre plumbed 1 Cylinder 1 c w Immersion Heater 2 Cylinder Feet 3 Supplied fitted to Cylinder 3 Accumulator 1 Pre plumbed
29. e for the water to cool or run off some hot water then remove the plastic cap and press the Thermal Cut Out Thermostat manual reset button If the Thermal Cut Out Thermostat trips more than once switch off the heating system and Immersion Heater and contact your installer 2 3 2 Water Heated by Immersion He When the hot water is heated by the Immersi Thermostat prevents the water within the cyli The Immersion Heater Thermal Cut Out Ther ater on Heater its integral Thermal Cut Out nder overheating mostat is a manual reset type this means it has a small button that pops up when the thermostat has been tripped by overheating To reset the system after overheating switch water to cool or run off some hot water off the Immersion Heater allow time for the ALWAYS ISOLATE THE IMMERSION HEATER BEFORE REMOVING COVER When the cover is removed electrical live terminals are exposed OPERATOR CONTROLS 2 If the Immersion Heater Thermal Cut Out Thermostat trips more than once switch off the Immersion Heater and contact your installer To reset 125 150 210 amp 300 Cylinders Isolate the Immersion Heater THERMAL CUT OUT RESET BIPOLAR SAFETY Fig 2 3b 125 150 210 amp 300 Immersion Heater Thermal Cut Out Remove the Immersion Heater cover and using a small screwdriver press the Bipolar Safety reset button see fig 2 3b To reset 500 Cylinder Isolate the Immersion Heater Remove the Imme
30. e valve sticking Shuts off the mains water supply to the dwelling K 2 4 3 Cold Water Shut Off Valve Normally located in the cold feed close to the accumulator Shuts off the cold water to the taps CLOSED 2 4 4 Supply Water Shut Off Valve Normally located where the cold supply connects to the combination valve on the a cylinder A Shuts off the cold supply to the Dualstream system OPEN Fig 2 4b Valves 2 4 5 Hot Water Shut Off Valve Normally located where the Domestic Hot Water feed comes from the cylinder Shuts off the hot water to the taps 10 Duabtream Expansion Relief Note At least the Tundish or discharge pipe should remain in view do not box in or cover up either AIR BREAK DISCHARGE PIPE Fig 2 5a Tundish Note For more information see 4 3 Servicing The Dualstream installation has a TPR Valve normally mounted on the cylinder In the event of the pressure within the system becoming too high the TPR Valve will vent A Tundish will be fitted in the system this should be located in the same space or compartment as the hot water cylinder This device provides an air break when pressure is being vented When pressure is being vented water steam will be evident at the Tundish and from the discharge pipe of the Tundish Water will normally only discharge when there is an increase in pressure cause
31. f the tap hot water 2 The function of the Pressure Relief Valve and Combination Valve and that over pressure will cause steam and scalding water to be emitted from the discharge pipe 3 Tundish is supplied as a visual identification for over pressure 4 procedure to follow in the event of over pressure Refer to 2 5 This manual and supplements must be left with the householder together with a copy of the completed Guarantee Form 29 Duabtream Routine Service amp ARISTON benchmark gt The code of practice for t ning amp servicing of mains Installation Commissioning and Service Record Log Book IMPORTANT Also carry out any service requirements of specific components as specified by the manufacturers instructions Note If heavy scaling is evident then descaling the system is recommended Ensure system is fully flushed following descaling 30 The Dualstream system should have a routine service at least once in 12 months IMPORTANT Always turn off the heating system and electricity supply to the Dualstream before working on the Dualstream System 6 1 1 Service Procedure 18 19 20 2 22 22 24 25 26 2f 28 Confirm with customer service history and locate Benchmark Logbook Check cylinder model and serial number is listed in the Benchmark Logbook Visually inspect cylinder s for damage metal failure and signs of leaks Visua
32. ge pipe clearly visible tundish visible or not or onto a roof capable of withstanding high temperature discharges of water 3m from any plastic guttering systems that would collect such a discharge tundish visible 4 Where a single pipe serves a number of discharges such as in blocks of flats the number served should be limited to not more than 6 systems so that any installation can be traced reasonably easily The single common discharge pipe should be at least one pipe size larger than the largest individual discharge pipe to be connected If unvented hot water storage systems are installed where discharges from safety devices may not be apparent i e in dwellings occupied by blind infirm or disabled people consideration should be given to the installation of an electronically operated device to warn when discharge takes place Note The discharge will consist of scalding water and steam Asphalt roofing felt and non metallic rainwater goods may be damaged by such discharges 21 FIXED GRATING TRAPPED GULLY L METAL DISCHARGE PIPE D1 TO TUNDISH 15mm CN EGHBRHROR u VALVE 8 L JG 8 TUNDISH B 5 CONTINUOUS FALL DISCHARGE PIPE D2 METAL FROM TUNDISH INSTALLATION 4 TPR VALVE Fig 4 30 Typical Expansion Discharge Arrangement 22 Valve outlet size Minimum size of disch
33. inder Thermostat to 60 C not required on 500 Cylinders The Boiler and heating system should be checked before continuing 19 20 21 22 23 24 25 26 2 Indirect Check heating system has correct type of motorised valve fitted and wired correcly to the cylinder flow Set Motorised Valve to Manual open and allow the heat coil to fill Set the Motorised Valve to Auto Switch on the heating system Wait for the system to heat up Check temperature of hot tap water max 60 C Check operation of cylinder thermostat When turned down below tank temperature the motorised valve should open When turned up above tank temperature the motorised valve should close Check for leaks again when the system is up to temperature Fill in details in the Benchmark Logbook Duabtream CAUTION The main supply must be turned OFF and water drained from the Accumulator before lowering the charge pressure failure to do so could result in damage to the diaphragm Also refer to 4 2 5 and 4 5 If in doubt consult GAH Heating Products Handing Over 5 1 1 Accumulator Pressure Accumulators are supplied by GAH with a preset air charge of 2 Bar 28 30psi The Combination Valve supplied with the Dualstream system has an integral pressure reducing valve fixed at 3 5 Bar Therefore there is a pressure differential of 1 5 bar between the system pressure and the air charge of the Accumulator When the incoming ma
34. ins pressure is less than 3 5 Bar the pressure differential will be higher than 1 5 Bar and the Accumulator will not fill sufficiently therefore it may be necessary to lower the Accumulator air charge pressure The procedure for changing the Accumulator pressure is given below this can be done before the system has been filled It may be done after the system has been filled and tested providing the incoming main has been turned OFF and the water drained from the Accumulator Failure to do this may result in false pressure reading and damage to the butyl diaphragm If mains pressure is 3 5 Bar or above changing the Accumulator charge pressure will not be necessary Adjusting Air Pressure 1 Record mains pressure 2 Tur main supply OFF 3 Turn on cold outlets to empty Accumulator 4 Remove black cap from top of Accumulator check confirm Accumulator pressure with pressure gauge Lower air charge so that is 1 to 1 5 Bar below mains pressure Minimum Accumulator pressure is 0 5 bar to 0 8 Bar CHARGE VALVE SCHRADER BUTYL DIAPHRAM Fig 5 1a Accumulator Complete the Guarantee Form the top sheet of this MUST be sent to GAH HEATING PRODUCTS LIMITED Complete the Benchmark Logbook The Installer should re check the system and ensure it is completely satisfactory before demonstrating to the householder The householder should be aware of the following 1 Howto set the temperature o
35. lly inspect accumulator for damage metal failure and signs of leaks When applicable visually inspect expansion vessel and its pipework for damage metal failure and signs of leaks Visually inspect all Dualstream pipework for damage metal failure and signs of leaks Record mains pressure and system pressure Turn the Heating System OFF Turn the electrical supply to the Dualstream OFF Momentarily open the combination TPR Valve and check that the water drains freely and safely to and from the tundish Open cylinder TPRV for 15 seconds and close valve should shut off Repeat if valve sticks If valve will not shut off replace valve Open combination PRV for 15 seconds and close valve should shut off Repeat if valve sticks If valve will not shut off replace valve Close the Stop Cock Open the hot and cold taps attach a hose to the cylinder and accumulator drain cocks and empty the system Check the pressure of the accumulator this should be 1 5 Bar below the mains pressure with an absolute minimum of 0 5 0 8 Bar Remove Immersion Heater remove limescale and examine the element In hard water areas it is probably better to replace the Immersion Heater if heavily scaled Refit Immersion Heater with gasket Most glass lined cylinders will have at least one magnesium anode remove and inspect all anodes replace if required Clean and check the line strainer in the combination valve replace if required Check an
36. m MUST be completed and returned to GAH HEATING PRODUCTS in the prepaid envelope provided 5 1 1 Commissioning Procedure il NO Rc n Check accumulator pressure is 1 5 Bar below the mains pressure minimum 0 5 Bar Check the Tundish is correctly installed to conform to the Building Regulations G3 Check all pipe connections are tight and no joints have been left unsoldered Check ALL drain cocks are closed Check ALL wiring connections have been made Check the required earth continuity conductors have been fitted C heck the Immersion Heater has its cover and gasket fitted and is tight in the cylinder Check the Immersion Heater is set to 60 C If fitted check that the Scale Protection device or Water Softener has been fitted according to manufacturers instructions Open all shut off valves on Mains Stop Cock and allow the system to fill Open all domestic taps in turn to purge air Check system for leaks including around the Immersion Heater Check the installation of the tundish complies with the Building Regulations Check no water is discharging from the Pressure Relief Valve or the TPR valve this will be evident at the Tundish Test the operation of the TPR Valve by turning the manual test cap and ensure the water flows freely and safely to waste Test the operation of the Combination Valve by turning the manual test cap and ensure the water flows freely and safely to waste Set Cyl
37. on by means of a building notice or by the submission of full plans for the proposed installation of an unvented hot water Storage system 4 1 1 Regulations The Water Byelaws and Current Building Regulations paying particular attention to G3 and Part L 1 amp 2 and HSE requirements should be considered when installing a Dualstream System 4 1 2 Electrical Regulations All wiring should carried out to and comply with the current IEE Wiring Regulations All electrical work must comply with any relevant regulations that apply at the time of the installation 4 1 3 Electrical Work All electrical installation and maintenance of the Dualstream must be carried out by a competent qualified installer All electrical work must be installed to the requirements of these User and Installation Instructions Fig 4 2a Cylinder Thermostat 18 4 2 1 Unvented Hot Water Cylinder The cylinder may be installed at any convenient above ground location within the dwelling As Dualstream is a sealed system the cylinder is equally effective on any floor The cylinder must always be installed vertically Avoid positioning the cylinder where it may be subjected to frost The floor must give adequate support to the filled cylinder Cylinders with legs are supplied with self tapping screws for floor fixing For maintenance purposes leave at least 500mm at the front of the cylinder The cylinder may be installed below ground i e in
38. personal injury caused by not giving due consideration to the above safety recommendations GAH Heating Products Ltd Building 846 Bentwaters Parks Rendlesham Woodbridge Suffolk IP12 2TW Tel 01394 421160 Fax 01394 421170 email mail gah co uk www gah co uk Duabtream WATER CONTROL HEATING GAR PRODUCT GAH Heating Products Ltd Building 846 Bentwaters Parks Rendlesham Woodbridge Suffolk IP12 2TW Tel 01394 421160 Fax 01394 421170 email mail gah co uk www gah co uk
39. pted k water softener when fitted is operating correctly 31 Duabtream mar Notes 32 Dual ream Important Health and Safety Information for Installers and Service Engineers Health and Safety at Work Act 1974 Consumer Protection Act 1987 COSHH Regulations 1988 The following information is given as a requirement of the above legislation Great care is taken by GAH HEATING PRODUCTS LIMITED to ensure that Dualstream systems are designed and manufactured to meet general safety requirements when properly used and installed as recommended in this manual It is the responsibility of Users and Engineers to ensure that adequate protective clothing and glasses are worn when working with the Dualstream system SEALS AND INSULATION Insulation and sealing materials are used in the construction of the Dualstream cylinders Units are sealed and when used in the manner for which they are intended the insulating and sealing materials do not present any known hazard However always observe the following recommendations 1 Avoid inhalation of fibres or dust wear face mask 2 Avoid eye contamination by fibres or dust wear eye protection 3 As far as possible avoid any skin contact with Fibreglass Insulation Glass Rope Mineral Wool Insulation Pads and Ceramic Fibre In pursuance of a policy of constant development GAH HEATIN
40. ration it is recommended to split this valve and fit the 3 5 bar pressure reducing part of the valve on the incoming mains supply immediately after the double check valve The PRV non return valve part should be re fitted to the cylinder as supplied This installation method does not allow for the accumulator to take up expansion from the unvented cylinder therefore a Suitably sized independant expansion vessel must be fitted This should be connected to the 6 Bar port of the PRV non return valve part of the combination valve at the cylinder The incoming mains supply is connected to the accumulator Provision must be made between the double check valve and the accumulater for outside tap boiler heating system fill and water softener as applicable The cold supply from the accumulator is connected to the PRV non return valve once passed this the incoming water supplies the accumulator and cylinder Supply to all the cold taps and outlets is taken from the T fitting located under the PRV non return valve Supply to the hot taps and outlets is taken from the cylinder in the traditional manner The cylinder HTP Valve and the combination valve PRV should be plumbed to the tundish supplied installation must comply with building regulations Three full bore lever valves are supplied it is recomended to install these one each incoming mains to the PRV non return valve hot supply from cylinder cold supply to taps Duabin
41. rsion Heater cover and using a small screwdriver press the S reset button see fig 2 3c CUT OUT RESET S Fig 2 3c 500 Immersion Heater Thermal Cut Out Duabtream OPERATOR CONTROLS 2 Shut Off Valves The Dualstream installation will have a number of shut off valves the location of these will be dependent on the installation fig 2 4a shows a typical layout BALANCED UNVENTED COLD SUPPLY CYLINDER TO TAPS HOT WATER SHUT OFF ACCUMULATOR VALVE 46 R um WATER SHUT OFF VALVE OUTSIDE Co TAP i HEATING A SYSTEM E KITCHEN sNKcop LL WATER icv C SOFTENER 8 1 MAIN SUPPLY lt gt 2 Ses STOP DOUBLE rap RETURN A COCK CHECK EXPANSION 2 VALVE DISCHARGE a wave EU COLD WATER SHUT OFF VALVE Fig 2 4a Typical Shut Off Valve Locations IMPORTANT Before closing ANY valve 1 Switch OFF the Electric Immersion Heater 2 Turn OFF the Heating System 2 4 1 Stop Cock Normally located at the point where the mains supply enters the dwelling Shuts off the mains water supply to the dwelling Note When opening the stop cock turn the valve 2 4 2 Double Check Valve i fitted fully open then close 72 turn this prevents Normally located after the Stop Cock Prevents water backfeeding to main th
42. s even when more than one outlet is in use at the same time Dualstream has been designed to function on the minimum standard for domestic water supply as provided by local water authorities which is 1 Bar at 9 litres per minute GAH offer full technical assistance and design service to enable the optimum Dualstream system to be configured to overcome situations where poor mains supply and pressure are considered a problem 1 1 2 How the Dualstream system works The system mainly comprises an unvented direct or indirect cylinder an accumulator cold water storage vessel a combination valve and an expansion relief valve The accumulator has an internal controlled butyl diaphragm incoming cold water is stored within this diaphragm at mains pressure The air space between the diaphragm and the accumulator case is pressurised this balances the supply and maintains pressure to the unvented hot water cylinder and cold outlets When hot and cold water outlets are turned on the stored water from the accumulator supplements water from the incoming main this results in consistent pressure and flow to all taps showers and baths even when outlets are used simultaneously Pressure will be sustained for as long as the accumulator is holding suffficient volume of water 1 1 3 System Comprises 1 Anunvented hot water cylinder pre plumbed with all valves and controls with easy access pipe connections for quick trouble free installation 2 Cylin
43. tallation must be approved by the local building control 4 3 3 Expansion Discharge Pipe To Gully See Fig 4 3b Discharge pipes from the temperature TPRV and PRV may be joined together The pipe diameter must be at least one pipe size larger than the nominal outlet size of the safety device this is adequate when the hydraulic resistance does not exceed that of a straight pipe 9m long Bends must be taken into account in calculating the flow resistance Minimum pipe sizes are given in Table 1 The discharge pipe must have a vertical section of pipe at least 300mm in length below the tundish before any elbows or bends in the pipework The discharge pipe must be installed with a continuous fall The discharge must be visible at both the tundish and the final point of discharge but where this is not possible or practically difficult there should be clear visibility at one or other of these locations Examples of acceptance are 1 Ideally below a fixed grating and above the water seal in a trapped gully 2 Downward discharges at a low level i e up to 100mm above external surfaces such as car parks hard standings grassed areas etc These are acceptable providing that where children may play or otherwise come into contact with discharges a wire cage or similar guard is positioned to prevent contact whilst maintaining visibility 3 Discharges at high level i e into a metal hopper and metal downpipe with the end of the dischar
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