Hot Water Cylinder Installation UK
Contents
1. AIR TO WATER HEAT PUMP SYSTEM HOT WATER CYLINDER INDIRECT HEATING METHOD CLOSED OUTLET UNVENTED INSTALLATION AND SERVICE MANUAL HWS 1501CSHM3 UK HWS 2101CSHM3 UK HWS 3001CSHM3 UK 36006030 Issue H INSTALLATION AND SERVICING INSTRUCTIONS FOR AIR TO WATER HEAT PUMP SYSTEM WATER CYLINDER PLEASE LEAVE THIS MANUAL WITH THE UNIT FOR FUTURE REFERENCE CONTENTS SECTION CONTENT 1 INTRODUCTION 2 GENERAL REQUIREMENTS 3 INSTALLATION GENERAL 4 INSTALLATION INDIRECT UNITS 5 COMMISSIONING 6 MAINTENANCE 7 FAULT FINDING AND SERVICING 8 USER INSTRUCTIONS 9 GUARANTEE 1 0 INTRODUCTION IMPORTANT THIS APPLIANCE IS NOT INTENDED FOR THE USE BY PERSONS INCLUDING CHILDREN WITH REDUCED PHYSICAL SENSORY OR MENTAL CAPABILI TIES OR LACK OF KNOWLEDGE AND EXPE RIENCE UNLESS THEY HAVE BEEN GIVEN SUPERVISION OR INSTRUCTION CONCERN ING THE USE OF THE APPLIANCE BY A PER SON RESPONSIBLE FOR THEIR SAFETY This unit for use with the ESTIA air to water heat pump system is a purpose designed unvented water cylinder The unit has a stainless steel inner vessel which ensures an excellent standard of corrosion re sistance The outer casing is a combination of resilient thermoplastic mouldings and plastic coated corrosion proofed steel sheet Table 1 Operational Summary Maximum water supply pressure to PRV Operating pressure of unit Expansion vessel charge pressure Expansion val2. tify the model installed and ensure the correct part Refit the cylinder heater wiring links by inserting the male terminations into the female terminals on the ele ment tails in accordance to Figure 6 Check all wiring terminations are tight and secure Replace and secure the terminal cover is ordered 6 5 EXPANSION VESSEL CHARGE PRESSURE Description Remove the dust cap on top of the vessel Check the Cylinder heater 95606967 charge pressure using a tyre pressure gauge The pres Cylinder heater gasket 95611012 sure with system de pressurised should be 0 35MPa_ Cylinder heater backnut 95607118 3 5bar If it is lower than the required setting it Cylinder heater key spanner 95607119 should be re charged using a tyre pump Schrader Tundish 95605062 valve type DO NOT OVER CHARGE Re check the Expansion valve cartridge 6bar 95605063 pressure and when correct replace the dust cap Expansion valve complete 6bar 95605064 Cold water combination valve complete 95605065 6 6 RE COMMISSIONING Cold water combination valve body 95605066 Check all electrical and plumbing connections are se Check valve housing 95605067 cure Close the drain cock With a hot tap open turnon Pressure reducing valve cartridge 3 5bar 95605068 the cold water supply and allow unit to refill DO NOT Pressure reducing valve housing 95605069 switch on the air to water heat pump system until the Temperature Pressure Relief Valve 95605070 unit is full When water flows from the
3. valve with a discharge pipe D2 having 4 No elbows and length of 7m from the tundish to the point of dis charge From Table 4 Maximum resistance allowed for a straight length of 22mm copper discharge pipe D2 from a G1 2 tempera ture relief valve is 9 0m Subtract the resistance for 4 No 22mm elbows at 0 8m each 3 2m Therefore the permitted length equates to 5 8m 5 8m is less than the actual length of 7m therefore calcu late the next largest size Maximum resistance allowed for a straight length of 28mm pipe D2 from a G1 2 temperature relief valves equates to 18m Subtract the resistance of 4 No 28mm elbows at 1 0m each 4 0m Therefore the maximum permitted length equates to 14m As the actual length is 7m a 28mm D2 copper pipe will be satisfactory 3 9 WARNINGS e No control or safety valves should be tampered e Under no circumstances should the factory fitted with Temperature Relief Valve be removed other than by e The discharge pipe should not be blocked or used an authorised installer To do so will invalidate any for any other purpose guarantee or claim e The tundish should not be located adjacent to anv e The Cold Water Combination Valve must be fitted electrical components to the mains water supply to the unit Valve outlet size Minimum size of Minimum size of Maximum Resistance discharge pipe discharge pipe resistance created by each D1 D2 from tundish allowed elbow or bend expressed
4. cylinder heater backnut A key spanner is provided with the unit for easy removal tightening of the backnut Remove the cylinder heater from the unit NOTE Over time the cylinder heater gasket may become stuck to the mating surface to break the seal insert a round bladed screwdriver into one of the pockets and gently lever up and down Carefully remove any scale from the surface of the element DO NOT use a sharp implement as damage to the element surface could be caused Ensure sealing surfaces are clean and seals are undamaged If in doubt fit a new gasket Replace the cylinder heater ensuring the element tails are in the vertical plane see Fig 6 Secure in place by re fitting cylinder heater backnut and tightening Replace the element tail insulating shroud by carefully pushing it over the element tails until it sits flush with the face of the element mounting plate Replace the thermal cut out into the left hand pocket of the cylinder heater Ensure it is fully inserted and that the capillary tube is not kinked Ensure the capillary tube is routed such that it does not come into contact with the ele ment tails Replace the thermal sensor in the left hand pocket of the cylinder heater Ensure it is fully inserted behind the thermal cut out and the securing grommet is pushed into the open end of the pocket 7 2 SPARE PARTS A full range of spare parts are available for the range Refer to the Technical Data label on the unit to iden
5. discharged may be very hot Repeat the above procedure for the Expansion Valve 6 3 STRAINER Turn off the cold water supply air to water heat pump system and cylinder heater The lowest hot water tap should then be opened to de pressurise the system Remove the Pressure Reducing Valve Cartridge by unscrewing from the housing Pull the Reducing Valve cartridge from the housing to access the strainer mesh Wash any particulate matter from the strainer under clean water Re assemble ensuring the seal is correctly fitted DO NOT use any other type of seal ant Ensure the Pressure Reducing Valve Cartridge is fully tightened 6 4 DESCALING CYLINDER HEATER Before removing the cylinder heater the unit must be drained Ensure the water and electrical supply and air to water heat pump are OFF before draining Attach a hose pipe to the drain cock having sufficient length to take water to a suitable discharge point below the level of the unit Open a hot tap close to the unit and open drain cock to drain unit ISOLATE FROM MAINS BEFORE REMOVING TERMINAL COVER Open the terminal cover Disconnect the link wires connecting the thermal cut out to the cylinder heater Carefully remove the thermal sensor from its pocket on the cylinder heater by pulling outwards Care fully remove the thermal cut out sensing bulb from its pocket by pulling outwards Remove the element tail insulating shroud by pulling it outwards from the element Unscrew the
6. 5MPa 3 5bar 2 CONTINUALLY a Cold Water Combination Valve Pressure Reducer not working correctly b Expansion Valve seat damaged 1 Thermal control failure NOTE water will be very hot DO NOT TAMPER WITH ANY OF THE SAFETY VALVES OR CONTROLS SUPPLIED WITH THE UNIT AS THIS WILL INVALI DATE ANY GUARANTEE 1 Check and turn on mains water supply 2 Turn off water supply Remove filter and clean in accordance with manufacturers instructions 3 Check and refit as required 1 Check setting 2 Check operation of Heat Pump If a fault is suspected consult the Heat Pump manual 3 Check sensor operation Replace if necessary 1 Check Reset by pushing button on cut out 2 Check sensor operation Replace if necessary 1 Check and adjust as required 2 Check sensor operation Replace if necessary 1 See Section 6 5 for re charging procedure a Check pressure from Cold Water Combination Valve If greater than 0 35MPa 3 5bar replace Pressure Reducer cartridge b Remove Expansion Valve cartridge Check condition of seat If necessary fit new Expansion Valve cartridge 1 Switch off power to cylinder heater and shut down Hydro Unit DO NOT turn off water supply When discharge stops check all thermal controls replace if faulty 8 0 USER INSTRUCTIONS 8 1 WARNINGS IF WATER ISSUES FROM THE TEMPERA TURE PRESSURE RELIEF VALVE ON THE UNIT SWITCH OFF ELECTRICAL SUPPLY TO THE AIR TO WATER HEA
7. However at these values outlet flowrates may be poor if several outlets are used si multaneously The higher the available pressure and flowrate the better the system performance The unit has an operating pressure of 0 35MPa 3 5 bar that is controlled by the Cold Water Combination Valve The Cold Water Combination Valve can be connected to a maximum mains pressure of 1 6MPa 16 bar 2 4 OUTLET TERMINAL FITTINGS TAPS ETC The unit can be used with most types of terminal fit tings It is advantageous in many mixer showers to have balanced hot and cold water supplies In these instances a balanced pressure cold water connection should be placed between the Cold Water Combination Valve and the water cylinder Outlets situated higher than the unit will give outlet pressures lower than that at the cylinder a 10m height difference will result in a 0 1MPa 1 bar pressure reduction at the outlet 2 5 LIMITATIONS The unvented water cylinder should not be used in association with any of the following e Ascending spray type bidets or any other class 1 back syphonage risk requiring that a type A air gap be employed e Situations where maintenance is likely to be neglected or safety devices tampered with e Water supplies that have either inadequate pres sure or where the supply may be intermittent e Situations where it is not possible to safely pipe away any discharge from the safety valves e In areas where the water consiste
8. ING CONNECTIONS The water cylinder requires the following pipework connections e Cold water supply to and from inlet controls e Outlet to hot water draw off points e Discharge pipework from valve outlets to tundish e Connection to the primary circuit Refer to the Hydro Unit Installation Instructions for details Primary connections are 22mm compression How ever 3 4 BSP parallel threaded fittings can be fitted to the primary coil connections if required 4 2 ELECTRICAL SUPPLY FIG 6 All units are fitted with a 2 75kW 230V cylinder heater and a thermal cut out to supplement the Air to Water heat pump primary heating The unit MUST be earthed All wiring to the unit must be installed in accordance with the latest IEE Wiring Regulations and the sup ply circuits must be protected by a suitable fuse and double pole isolating switch with a contact separation of at least 3mm in both poles ISOLATE FROM MAINS SUPPLY BEFORE REMOVING ANY COVERS DO NOT BYPASS THE THERMAL CUT OUT IN ANY CIRCUM STANCES Ensure the thermal sensor and thermal cut out sensing bulbs are pushed fully into the pockets on the element plate assembly All wiring to the unit must be via the controls housing on the Hydro Unit Direct connection of the cylinder heater to the mains electrical supply will invalidate the guarantee and may result in a dangerous instal lation Refer to the wiring details in the Hydro Unit Installation Manual The supply c
9. N BWP 2 2 SITING THE UNIT The unit must be installed vertically Although loca tion is not critical the following points should be considered e The unit should be sited to ensure minimum dead leg distances particularly to the point of most frequent use e Avoid siting where extreme cold temperatures will be experienced All exposed pipework should be insulated e The discharge pipework from the safety valves must have minimum fall of 1 200 from the unit and terminate in a safe and visible position e Access to associated controls and cylinder heater should be possible to allow for periodic servicing and maintenance e Ensure that the base chosen for the unit is level and capable of permanently supporting the weight when full of water see Table 2 Table 2 Unit weights Model Nominal Weight of capacity unit full rae aa GW 1501CSHM3 UK aa HWS 2101CSHM3 UK 2101CSHM3 UK 251 2 3 WATER SUPPLY Bear in mind that the mains water supply to the property will be supplying both the hot and cold wa ter requirements simultaneously It is recommended that the maximum water demand is assessed and the water supply checked to ensure this demand can be satisfactorily met NOTE A high mains water pressure will not always guarantee high flow rates Wherever possible the mains supply pipe should be 22mm We suggest the minimum supply requirements should be 0 15MPa 1 5 bar pressure and 20 litres per minute flowrate
10. T PUMP SYSTEM DO NOT TURN OFF ANY WATER SUPPLY CONTACT A COMPETENT INSTALLER FOR UNVENTED WATER CYLINDERS TO CHECK THE SYSTEM DO NOT TAMPER WITH ANY OF THE SAFETY VALVES FITTED TO THE SYSTEM IF A FAULT IS SUSPECTED CONTACT A COMPETENT INSTALLER 8 2 TEMPERATURE CONTROL The water storage temperature at the air to water heat pump water cylinder is set at the control panel of the Hydro Unit This can be set to give temperatures in the range of 40 C to 75 C 60 C is recommended Refer to the Air to Water Owners Manual for details of how to adjust the temperature if necessary The water cylinder is fitted with an over temperature thermal cut out that will operate should the thermo static control fail DO NOT bypass the thermal cut out in any cir cumstances 8 3 FLOW PERFORMANCE When initially opening hot outlets a small surge in flow may be noticed as pressures stabilize This is quite normal with unvented systems In some areas cloudiness may be noticed in the hot water This is due to aeration of the water is quite normal and will quickly clear 8 4 OPERATIONAL FAULTS Operational faults and their possible causes are de tailed in Section 7 0 It is recommended that faults should be checked by a competent installer The air volume within the expansion vessel will peri odically require recharging to ensure expanded water is accommodated within the unit A discharge of water INTERMITTENTLY from the Expansion Valve will in
11. able to the cylinder heater must be routed through the right hand cable gland provided and the outer sheath of the cable firmly secured by tightening the cable gland Connection must be to the terminal block marked TB03 230V The recommended cable type is 2 5mm7 3 core heat resistant sheathed The thermal sensor connection cable must be routed through the left hand cable gland provided and the outer sheath of the cable firmly secured by tightening the cable gland Connection must be to the terminal block marked TB06 TTW The sensor cable should be 0 75mm 2 core and shield ground with a maxi mum current rating of 100mA The cable shielding wire must be connected to the terminal marked on the sensor terminal block Thermal control of the water cylinder is managed by the Heat Pump controls on the Hydro Unit Refer to the Hydro Unit Installation Manual for details of how to set up the thermal control The electrical supply from Hydro Unit to the cylinder heater incorporates an over temperature thermal cut out that will switch off the heater in the event of a thermal control failure The thermal cut out must not be bypassed in any circumstances 5 0 COMMISSIONING Warning Water that is left standing in a stainless steel water cylinder for long periods without draw off will become de oxygenated and potentially cor rode the vessel material If the installation is to be left unused following installation and commission ing t
12. alve Complete 6 bar Check Valve Housing Pressure Reducing Valve Housing Housing Securing Screws 4 off Pressure Reducing Valve Cartridge 3 5 bar Cold Water Combination Valve Complete FIG 8 Cold Water Combination Valve Exploded view Strainer Mesh 7 3 FAULT FINDING The Fault Finding chart below will enable operational faults to be identified and their possible causes rectified Any work carried out on the unvented water cylinder and its associated controls MUST be carried out by a WARNING competent installer for unvented water heating systems In case of doubt contact installer TABLE 5 Fault Finding Chart FAULT POSSIBLE CAUSE REMEDY No hot water flow water supply Water from hot taps is cold Water from hot taps is only warm Water from hot taps is too hot Water discharges from Expansion Valve Water discharges from T amp P Relief Valve 1 Mains supply off 2 Mains water filter if fitted blocked 3 Cold Water Combination valves fitted incorrectly 1 Controller on Heat Pump Hydro Unit set to space heating only 2 Heat Pump not working 3 Faulty water cylinder temperature sensor 1 Cylinder heater thermal cut out has operated 2 Faulty water cylinder temperature sensor 1 Water storage temperature on Hydro Unit controller is set too high 2 Faulty water cylinder temperature sensor 1 INTERMITTENTLY Expansion Vessel charge has reduced below 0 3
13. asa length of straight pipe l e no elbows or bends up to 9m up to 18m up to 27m up to 9m up to 18m up to 27m up to 9m up to 18m up to 27m Table 4 Sizing of copper discharge pipe D2 for common temperature relief valve outlet Safety device e g Temperature relief valve Metal discharge pipe D1 from Temperature relief valve to tundish A 300mm Discharge below minimum fixed grating y Building Regulation G3 section 3 9d gives alternative points of discharge Discharge pipe D2 from tundish with continuous fall See Building Fixed grating Regulation G3 section 3 9d i iv Table 4 and worked example FIG 4 Typical discharge pipe arrangement extract from Building Regulation G3 Guid ance section 3 9 T amp P RELIEF VALVE ELEMENT CONTROLS HOUSING PRIMARY RETURN i gt PRIMARY FLOW FIG 5 Typical installation schematic GREEN YELLOW SENSOR BEE TO HYDRO UNIT EXPANSION VESSEL H i j sI1A H COLD WATER COMBINATION BALANCED VALVE COLD WATER CONNECTION IF REQUIRED MAINS WATER SUPPLY ISOLATING VALVE NOT SUPPLIED TUNDISH SECONDARY RETURN TAPPING IF REQUIRED DISCHARGE PIPE DRAIN COCK NOT SUPPLIED INLET DOUBLE POLE THERMAL CUT OUT TBO3 230V 230V MAINS SUPPLY FROM HYDRO UNIT 1 5mm MIN CABLE SIZE FIG 6 Electrical Connections Schematic 4 0 INSTALLATION INDIRECT UNITS 4 1 PLUMB
14. dicate the air volume has reduced to a point where it can no longer accommodate the expansion 9 0 GUARANTEE For warranty details please contact your ESTIA Heat Pump supplier This product is guaranteed provided that e The unit has been installed in accordance with the Installation and Service instructions and all relevant Codes of Practice and Regulations in force at the time of installation and that all necessary inlet controls and safety valves have been fitted correctly e Any valves and controls are of the recommended type and specification e It has only been used for the storage of potable water Max 250mg I chloride e The unit has not been modified or tampered with in any way and has been regularly maintained as detailed in the Installation and Service instructions e The unit has not been subjected to high chloride levels in the water supply or incorrect disinfection methods e Following commissioning the unit is put into service within a period of 7 days If this is not the case it must either be drained or regularly flushed as required in the section Commissioning Warning The unit is not guaranteed against damage by frost and the inner container with integral cylinder heater is not guaranteed against excessive scale build up Periodic loss of charge pressure from the Expan sion Vessel is normal indicated by an intermittent discharge of water from the Expansion Valve and is not covered under th
15. e place where there is no risk to persons in the vicinity of the discharge preferably be of metal and a be at least one pipe size larger than the nominal outlet size of the safety device unless its total equiva lent hydraulic resistance exceeds that of a straight pipe 9m long i e discharge pipes between 9m and 18m equivalent resistance length should be at least two sizes larger than the nominal outlet size of the safety device between 18 and 27m at least 3 sizes larger and so on Bends must be taken into account in calculating the flow resistance Refer to Diagram 1 Table 1 and the worked example An alternative approach for sizing discharge pipes would be to follow BS 6700 1987 Specification for design installation testing and maintenance of services supplying water for domestic use within buildings and their curtilages Appendix E section E2 and table 21 b have a vertical section of pipe at least 300mm long below the tundish before any elbows or bends in the pipework c be installed with a continuous fall d have discharges visible at both the tundish and the final point of discharge but where this is not possible or is practically difficult there should be clear vis ibility at one or other of these locations Examples of acceptable discharge arrangements are i ideally below a fixed grating and above the water seal in a trapped gully ii downward discharges at low level i e up to 100mm above external surfaces suc
16. e product guarantee Refer to Section 6 5 for details on how to restore the Expansion Vessel charge pressure This guarantee DOES NOT cover the ESTIA Air to Water Heat Pump Outdoor Unit or ESTIA Hydro Unit This guarantee does not affect your statutory rights ENVIRONMENTAL INFORMATION These products are manufactured from many recyclable materials At the end of their useful life they should be disposed of at a Local Authority Recycling Centre in order to realise the full environmental benefits Insulation is by means of an approved CFC HCFC free polyurethane foam with an ozone depletion factor of Zero NOTES CONTACT DETAILS TCUK Ltd Porsham Close Belliver Ind Est Plymouth Devon PL6 7DB Our policy is one of continuous product development and as such we reserve the right to change specifications without notice
17. h as car parks hard standings grassed areas etc 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 jii discharges at high level e g into a metal hopper and metal down pipe with the end of the discharge pipe clearly visible tundish visible or not or onto a roof capable of withstanding high temperature discharges of water and 3m from any plastics guttering system that would collect such discharges tundish visible iv 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 instalation discharging can be traced reasonably eas ily The single common discharge pipe should be at least one pipe size larger than the largest individual discharge pipe D2 to be connected If unvented hot water storage systems are installed where discharges from safety devices may not be apparent i e in dwell ings 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 Worked example of discharge pipe sizing The example below is for a G1 2 temperature relief
18. he water cylinder should be drained or regu larly once per week flushed through with fresh mains water 5 1 FILLING THE UNIT WITH WATER e Check Expansion Vessel pre charge pressure The vessel is supplied pre charged to 0 35MPa 3 5 bar to match the control pressure of the Pressure Reducing Valve The pre charge pressure is checked using a car tyre gauge by unscrewing the plastic cap opposite the water connection e Check all connections for tightness including the cylinder heater A cylinder heater key spanner is supplied for this purpose e Ensure the drain cock is CLOSED e Open a hot tap furthest from the water cylinder e Open the mains stop cock to fill the unit When water flows from the tap allow to run for a few min utes to thoroughly flush through any residue dirt or swarf then close the tap e Open successive hot taps to purge the system of air 5 2 SYSTEM CHECKS e Check all water connections for leaks and rectify as necessary e Remove the Pressure Reducing Valve headwork to access the strainer mesh clean and re fit e Manually open for a few seconds each relief valve in turn checking that water is discharged and runs freely through the tundish and out at the discharge point e Ensure that the valve s reseat satisfactorily 5 3 PRIMARY CIRCUIT Fill the primary circuit following the procedure de tailed in the Hydro Unit Installation Manual Vent any trapped air by opening the air bleed point or aut
19. hot tap allow to flow for a short while to purge air and flush through Expansion vessel 12 litre 150 litre models Expansion vessel 18 litre 210 litre models 95607127 95607128 any disturbed particles Close hot tap and then open Expansion vessel 25 litre 300 litre models 95607129 successive hot taps in system to purge any air T amp P valve insulation set 95607130 Thermal sensor 95612037 When completely full and purged check system for Thermal cut out cylinder Heater 95612038 leaks The air to water heat pump system can then be Terminal cover 95614109 switched on Terminal block cylinder heater connection 95607113 Terminal block thermal sensor connection 95607114 Element tail insulating shroud 95607115 7 0 FAULT FINDING AND Set of compression nuts and olives 95607116 Secondary re circulation connection plug 95607117 SERVICING Expansion Valve 7 1 IMPORTANT Cartridge e Servicing should only be carried by Service Engineers or Agents or by competent installers in the installation and maintenance of unvented water heat ing systems e Any spare parts used MUST be authorised parts e Disconnect the electrical supply before removing any electrical equipment covers e NEVER bypass any thermal controls or operate system without the necessary safety valves e Water contained in the unit may be very hot es pecially following a thermal control failure Caution must be taken when drawing water from the unit Expansion V
20. is arequirement of Building Regulation G3 that any discharge from an unvented system is conveyed to where it is visible but will not cause danger to persons in or about the building The tundish and discharge pipes should be fitted in accordance with the require ments and guidance notes of Building Regulation G3 The G3 Requirements and Guidance section 3 9 are reproduced in the following sections Information Sheet No 33 available from the British Board of Agrement gives further advice on discharge pipe installation For discharge pipe arrangements not covered by G3 Guidance or BBA Info Sheet No 33 advice should be sought from either your local Build ing Control Officer G3 REQUIREMENT there shall be precautions to ensure that the hot water discharged from safety devices is safely conveyed to where it is visible but will not cause danger to persons in or about the building G3 GUIDANCE SECTION 3 9 The discharge pipe D1 from the vessel up to and including the tundish is generally supplied by the manufacturer of the hot water storage system Where otherwise the installation should include the discharge pipe s D1 from the safety device s In either case the tundish should be vertical located in the same space as the unvented hot water storage system and be fitted as close as possible and within 500mm of the safety device e g the temperature relief valve The discharge pipe D2 from the tundish should terminate in a saf
21. ntly contains a high proportion of solids e g suspended matter that could block the strainer unless adequate filtration can be ensured Table 3 Standing heat losses Nominal capacity Standing Heat Loss per day per year litres kWh 24h kWh 365d 150 1 45 529 3 210 1 91 697 2 300 2 52 919 8 Based on an ambient air temperature of 20 C and a stored water temperature of 65 C 3 0 INSTALLATION GENERAL 3 1 PIPE FITTINGS All pipe fittings are made via 22mm compression fittings directly to the unit The fittings are threaded 3 4 BSP male parallel should threaded pipe connec tions be required 3 2 COLD FEED A22mm cold water supply is recommended however if a 15mm 1 2 supply exists which provides suf ficient flow this may be used although more flow noise may be experienced Astopcock or servicing valve should be incorporated into the cold water supply to enable the unit and its associated controls to be isolated and serviced 3 3 COLD WATER COMBINATION VALVE FIG 1 The Cold Water Combination Valve can be connected anywhere on the cold water mains supply prior to the Expansion Vessel see Fig 5 The Cold Water Com bination Valve is installed as a complete one piece unit The valve incorporates the Pressure Reducer Strainer Expansion Valve and Check Valve Ensure that the valve is installed with the direction of flow arrows pointing in the right direction No other valves sho
22. omatic air vent Ensure the water cylinder is full of water before switching on the Air to Water heat pump System Switch on the electrical supply to the heat pump and ensure the programmer is set to HOT WATER mode Check that any motorised valves or primary pumps are working and allow the unit to heat TERMINAL BRACKET RESET BUTTON LOCATED ON THIS FACE THERMAL CUT OUT SENSOR TERMINAL BLOCK MAINS TERMINAL BLOCK NOTE THE COVER AND ELEMENT ASSEMBLY HAVE BEEN REMOVED FROM THIS VIEW FOR CLARITY FIG 7 Thermal cut out 6 0 MAINTENANCE 6 1 MAINTENANCE REQUIREMENTS Unvented hot water systems have a continuing main tenance requirement in order to ensure safe working and optimum performance It is essential that the Relief Valve s are periodically inspected and manu ally opened to ensure no blockage has occurred in the valves or discharge pipework Similarly cleaning of the strainer element and replacement of the air in the Expansion Vessel will help to prevent possible operational faults The maintenance checks described below should be performed by a competent installer on a regular basis e g annually to coincide with the air to water heat pump maintenance 6 2 SAFETY VALVE OPERATION Manually operate the Temperature Pressure Relief Valve for a few seconds Check water is discharged and that it flows freely through the tundish and discharge pipework Check valve reseats correctly when released NOTE Water
23. uld be placed between the Cold Water Combination Valve and the unit The Expansion Valve connection must not be used for any other purpose EXPANSION VALVE EXPANSION VALVE OUTLET 15mm COLD MAINS CONNECTION PRESSURE REDUCING VALVE HOUSING OUTLET CONNECTION 22mm PRESSURE REDUCING VALVE CARTRIDGE 3 5 bar FIG 1 Cold Water Combination Valve 3 4 DRAIN TAP A suitable draining tap should be installed in the cold water supply to the unit between the Cold Water Combination Valve and the cylinder at as low a level as possible It is recommended that the outlet point of the drain pipework be at least 1 metre below the level of the cylinder this can be achieved by attaching a hose to the drain tap outlet spigot 3 5 EXPANSION VESSEL The Expansion Vessel accommodates expansion that results from heating the water inside the unit The unit is pre charged at 0 35MPa 3 5 bar The Expansion Vessel must be connected between the Cold Water Combination Valve and the water cylinder see Fig 5 The location of the Expansion Vessel should allow access to recharge the pressure as and when necessary this can be done using a normal car foot pump It is recommended that the Expansion Vessel is adequately supported An Expansion Vessel wall mounting bracket is supplied for this purpose 3 6 SECONDARY CIRCULATION If secondary circulation is required it is recommended that it be connected to the cylinder as sho
24. ve setting Nominal storage capacity of units Max primary working pressure Opening temperature of T amp P Relief Valve Opening pressure of T amp P Relief Valve PAGE 10 11 13 14 The unit is supplied complete with all the necessary safety and control devices needed to allow connec tion to the cold water mains All these components are pre adjusted This appliance complies with the requirements of the CE marking directive and is KIWA approved to show compliance with Building Regulations Section G3 and UK Water Regulations The following instructions are offered as a guide to installation which must be carried out by a competent plumbing and electrical installer in accordance with Building Regulation G3 The Building Standards Scotland Regulations Section 4 standard 4 9 or The Building Regulations Northern Ireland Part P Section P5 NOTE Prior to installation the unit should be stored in an upright position in an area free from excessive damp or humidity IMPORTANT PLEASE READ ALL THESE INSTRUCTIONS BEFORE COMMENCING INSTALLATION 2 0 GENERAL REQUIREMENTS 2 1 COMPONENTS SUPPLIED Unvented water cvlinder incorporating cylinder heater and thermal controls Factory fitted Temperature Pressure Relief Valve T amp P Valve insulation and housing Cold Water Combination Valve Expansion Vessel and mounting bracket Tundish Compression nuts and olives Cylinder heater key spanner ANNM
25. wn in Fig 2 via a swept tee joint into the cold feed to the unit The secondary return pipe should be in 15mm pipe and incorporate a check valve to prevent backflow A suitable WRAS approved bronze circulation pump will be required On large systems due to the increase in system water content it may be necessary to fit an additional expansion vessel to the secondary circuit this should be done if the capacity of the secondary circuit exceeds 10 litres Pipe capacity copper 15mm o d 0 13 1 m 10 litres 77m 22mm o d 0 38 I m 10 litres 26m 28mm o d 0 55 1 m 10 litres 18m COLD COLD SUPPLY CHECK VALVE INLET CONNECTION SECONDARY SECONDARY CIRCULATION FIG 2 Secondary circulation connection 3 7 OUTLET The hot water outlet is a 22mm compression fitting located at the top of the cylinder Hot water distribu tion pipework should be 22mm pipe with short runs of 15mm pipe to terminal fittings such as sinks and basins Pipe sizes may vary due to system design NOMINAL CAPACITY litres A mm B mm C mm D mm SURFACE AREA sq m HOT WATER OUTPUT AT 60 C litres MIXED HOT WATER OUTPUT AT 40 C litres HEAT LOSS kWh 24h HEATING TIME 15 C TO 60 C USING ELECTRIC CYLINDER HEATER ONLY mins CAPACITY HEATED USING ELECTRIC CYLINDER HEATER ONLY litres FIG 3 General Dimensions and Performance 3 8 DISCHARGE PIPEWORK It
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