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Summary of Contents for REMEHA 94110301
- Page 1 36006247_issue_08 Installation Manual Unvented Indirect Water Heaters Installation & Servicing Instructions...
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Page 3: Table Of Contents
IMPORTANT Please read & understand all these instructions before commencing installation. Please leave this manual with the customer for future reference. page 1 Contents 1. Introduction 1.1 General 1.2 Symbols used 1.3 Abbreviations 1.4 Liabilities 2. Safety 2.1 General safety warnings 2.2 Recommendations 2.3 Specific safety instructions 3. -
Page 4: Introduction
6. Installation 6.1 General 6.2 Water connections 6.3 Electrical connections 6.4 Filling the installation 7. Commissioning 7.1 General 7.2 Checklist before commissioning 7.3 Commissioning procedure 8. Operation 8.1 General 9. Maintenance 9.1 General 9.2 Standard inspection & maintenance operations 10. Troubleshooting 10.1 Fault finding 11. -
Page 5: Symbols Used
The installation must be carried out by a competent plumbing and electrical installer in accordance with Building Regulation G3 (England and Wales), Technical Standard P3 (Scotland) or Building Regulation P5 (Northern Ireland) and the Water Fitting Regulations (England and Wales) or Water Byelaws (Scotland). - Page 6 Our products are manufactured in compliance with the requirements of the various applicable European Directives. This appliance complies with the requirements of the CE marking directive. In the interest of UK customers, we are continuously endeavouring to make improvements in product quality. All the specifications stated in this document are therefore subject to change without notice.
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Page 7: Safety
page 3 2. Safety 2.1 General safety warnings DANGER This cylinder is unvented and as such becomes pressurised when in operation. The combination of pressurisation and hot water could lead to serious physical injury if the safety instructions in this manual are not adhered to. WARNING Only competent persons having received adequate training are permitted to work on the appliance and the installation. -
Page 8: Technical Specifications
Do not tamper with any of the safety valves fitted to the system. If a fault is suspected contact a competent installer. DO NOT bypass the thermal cut-out(s) in any circumstances. page 4 3. Technical specifications 3.1 Immersion allocation Table 1: Immersion allocation table Element 94110301 94110302 94110303 94110304 94110305 94110306 94110307... - Page 9 Coil surface area m2 15 l/min 29.4 28.7 31.3 32.9 35.0 30.1 40.2 37.5 Coil rating (kW) 30 l/min 43.6 41.8 52.7 51.4 63.6 61.2 98.4 86.4 60l/miin 59.7 55.8 76.9 76.5 97.9 91.7 132.2 126.4 15 l/min Indirect heat time (mins) 30 l/min 60l/miin 15 l/min...
- Page 10 1.25" (1.5 - 6 bar) or (5 -10 bar) 1" x 1.25" (8 bar) or (13 bar) 1.25" 1000 1.25" (1.5 - 6 bar) or (5 -10 bar) 1" x 1.25" (8 bar) or (13 bar) 1.25" 1250 - 1450 1.5"...
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Page 12: Electrical Diagrams
Figure 2: General dimensions Table 4: General dimensions table - Indirect Item Connection 400I 500I Connection 800I 1000I Connection 1250I 1450I Connection 2000I 2500I 1500 1800 1906 2301 1937 2253 2011 2416 ½" BSP 1499 1897 ½" BSP 1411 1719 ½"... - Page 13 Figure 3: Indirect wiring diagram 1 Thermostat Option 2...
- Page 14 Figure 3a: Indirect wiring diagram 2 - volt free option NOTE: Option 2 utilises control thermostat to provide volt free control circuit. page 8...
- Page 15 Figure 4: Single phase wiring schematic...
- Page 16 Note: The 2 external contactors must be approved components certified for 10,000 cycles of operation for the contactor controlled by the thermostat and at least 30 for the contactor controlled by the non-self-resetting thermal cut-out.
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Page 17: Description Of The Product
Figure 5: 3 phase wiring schematic page 9 4. Description of the product 4.1 General description This product is a purpose designed unvented water heater. The unit has a stainless steel inner vessel, which ensures an excellent standard of corrosion resistance. The outer casing is a combination of resilient thermoplastic mouldings and soft jacket. - Page 18 # 2 port zone valve...
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Page 20: Before Installation
Figure 6: Main connections Note: This is an indirect unit and shows the general position of components but these will change depending on the model. 5. Before installation 5.1 Installation regulations WARNING Installation of the appliance must be carried out by a qualified engineer in accordance with prevailing and national regulations as listed below. Building Regulations The Building Standards (Scotland) The Building Regulations (Northern Ireland) -
Page 21: Choice Of Location
# Solid fuel boilers or any other boiler in which the energy input is not under effective thermostatic control, unless additional and appropriate safety measures are installed. # Ascending spray type bidets or any other class 1 back syphonage risk requiring that a type A air gap be employed. # Steam heating plants unless additional and appropriate safety devices are installed. -
Page 22: Transport
Figure 7: Siting the unit # Access to associated controls and immersion heaters must be available for the servicing and maintenance of the system. Where these controls are installed against a wall a minimum distance of 600mm must be left. # Ensure that the floor area for the cylinder is level and capable of permanently supporting the weight when full of water (see table 2 for weights). -
Page 23: Installation
6. Installation 6.1 General After reading the previous sections in this booklet and choosing a good location for the unit please install, paying attention to the following hydraulic, electrical and commissioning sections. Boiler selection # The boiler should have a control thermostat and non self-resetting thermal cut-out and be compatible with unvented storage water heaters. - Page 25 Figure 9: Installation schematic page 12 # The location of the expansion vessel should allow access to recharge the pressure as and when necessary. # A suitable draining tap should be installed in the cold water supply to the cylinder between the expansion valve and the heater at as low a level as possible.
- Page 26 Figure 10: Cold water combination valve (400 & 500ltr) page 13 Secondary circulation If secondary circulation is required it is recommended that it be connected to the cylinder as shown (see fig 11, below).
- Page 27 # The secondary return pipe should be in 28mm 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.
- Page 28 Water may drip from the discharge pipe of the pressure relief device. This pipe must be left open to the atmosphere. The pressure relief device is to be operated regularly to remove lime deposits and to verify that it is not blocked. G3 REQUIREMENT "..there shall be precautions...
- Page 29 (b) other material that has been demonstrated to be capable of safely withstanding temperatures of the water discharged and is clearly and permanently marked to identify the product and performance standard (e.g. as specified in the relevant part of BS 7291). 3.58 The discharge pipe (D2) should be at least one pipe size larger than the nominal outlet size of the safety device unless its total equivalent hydraulic resistance exceeds that of a straight pipe 9m long, i.e.
- Page 30 3.63 The discharge would consist of high temperature water and steam. Asphalt, roofing felt and non-metallic rainwater goods may be damaged by such discharges. Worked example of discharge pipe sizing Fig 11: shows a G1/2 temperature relief valve with a discharge pipe (D2) having 4 No. elbows and length of 7m from the tundish to the point of discharge.
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Page 32: Electrical Connections
Figure 11: Typical discharge pipe arrangement (extract from Building Regulation G3 Guidance Section 3.50) page 16 6.3 Electrical connections In case of difficulty contact service support. WARNING Disconnect from the mains electrical supply before removing any covers. Never attempt to replace the immersion heater(s) other than with the recommended immersion heater(s). DO NOT bypass the thermal cut-out(s) in any circumstances. -
Page 33: Checklist Before Commissioning
After filling the installation with water in the previous section please follow the following steps to complete the installation of the unit. WARNING DO NOT operate the immersion heaters or primary circuit until the cylinder has been filled with water. 7.2 Checklist before commissioning # Check all water connections for leaks and rectify as necessary. - Page 34 The cylinder is covered by the Benchmark Scheme which aims to improve the standards of installation and commissioning of domestic heating and hot water systems in the UK and to encourage regular servicing to optimise safety, efficiency and performance. Benchmark is managed and promoted by the Heating and Hotwater Industry Council. For more information visit www.centralheating.co.uk. Please ensure that the installer has fully completed the Benchmark Checklist and that you have signed it to say that you have received a full and clear explanation of its operation.
- Page 35 Figure 12: Auxiliary controls...
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Page 36: Operation
Figure 13: Indirect controls page 18 8. Operation 8.1 General... - Page 37 WARNING If water discharges from the temperature/pressure relief valve on the cylinder shut down the heat source. Do not turn off any water supply. Contact a competent installer for unvented water heaters 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. DO NOT bypass the thermal cut-out(s) in any circumstances.
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Page 38: Maintenance
9. Maintenance 9.1 General Maintenance requirements Unvented hot water systems have a continuing maintenance requirement in order to ensure safe working and optimum performance. It is essential that the relief valve(s) are periodically inspected and manually opened to ensure no blockage has occurred in the valves or discharge pipework. -
Page 39: Troubleshooting
# Remove the 8 nuts and withdraw the immersion heater. Take care when lifting the immersion heater out of the cylinder and work within safe working practices. # Carefully remove any scale from the surface of the immersion. CAUTION 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. -
Page 40: Fault Finding
WARNING Do not tamper with any of the safety valves or controls supplied with the cylinder as this will invalidate any guarantee. 10.1 Fault finding Important # After servicing, complete the relevant Service Interval Record section of the Benchmark Checklist. # Servicing should only be carried out by competent persons in the installation and maintenance of unvented water heating systems. -
Page 41: Decommissioning
Intermittently Expansion vessel charge pressure has See Maintenance section for re-charging of expansion vessel procedure reduced below 3.5 bar, or set too high Water discharges from expansion valve Continually Check pressure from cold water combination valve. Cold water combination valve pressure reducer not working If greater than 3.5 bar replace pressure reducing valve cartridge. - Page 42 Table 7: Spares DESCRIPTION SPARES NUMBER IMMERSION HEATER GASKET 95611025 BLANKING PLATE KIT 95607396 EXPANSION VESSEL 60L 6 BAR 95607445 EXPANSION VESSEL 100L 6 BAR 95607458 EXPANSION VESSEL 150L 6 BAR 95607461 EXPANSION VESSEL 200L 6 BAR 95612723 EXPANSION VESSEL 300L 6 BAR 95612724 1"...
- Page 43 7031588 ACTUATOR 240V 7035971 32 CONNECTION 7031595 40 CONNECTION 7031596 page 22 12.2 Accessories Table 8: Accessories Accessory Part number 6kW Element Assembly 94110301 9kW Element Assembly 94110302 12kW Element Assembly 94110303 18kW Element Assembly 94110304 24kW Element Assembly 94110305...
- Page 44 30kW Element Assembly 94110306 36kW Element Assembly 94110307 45kW Element Assembly 94110308 54kW Element Assembly 94110309 Destratification loop kit - 400-500 litre 95970140 Destratification loop kit - 800 - 1450 litre 95970157 Destratification loop kit - 2000 - 2500 litre 95970158 Temperature gauge 95970141...
- Page 45 Part No: See table Part No: 95:605:176 9 -12 Part No: See table Part No: 95:605:182...
- Page 46 Part No: 95:607:367 Part No: 95:607:425 16-18 19-21 Part No: See table Part No: See table...
- Page 47 22-23 Part No: 95:605:192 & 95:605:194 Part No: 95:605:103 Part No: 7033371 Part No: 95:612:650...
- Page 48 Part No: 95:612:652 Part No: 95:605:884 29-30 Part No: 7031564 & 7031565 Part No: 95:607:690...
- Page 49 Part No: 95:607:691 Part No: 95:980:025 35-36 Part No: 95:980:009 Part No: 95:607:366 & 95:607:404...
- Page 50 38-39 Part No: 95:605:177 Part No: 7031586 & 7031587 41-42 Part No: 7031588 & 7035971 Part No: 7031595 & 7031596 page 24 page 25 page 26...
- Page 51 page 27 page 28 page 29 MAINS PRESSURE HOT WATER STORAGE SYSTEM COMMISSIONING CHECKLIST...
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Page 53: Service Records
page 30 SERVICE RECORD It is recommended that your hot water system is serviced regularly and that the appropriate Service Record is completed. Service Provider Before completing the appropriate Service Record below, please ensure you have carried out the service as described in the manufacturer's instructions. -
Page 55: Guarantee
Consequential damages or profit loss which may arise from a defect. Warranty claims have no delaying effect on the payment dates and other demands Your Remeha warranty covers you for a equivalent replacement and labour in the event that the unit fails prematurely as a result of a proved manufacturing defect. - Page 56 Fax: 0118 978 6977 Email: boilers@remeha.co.uk 36006247_issue_08 page 32 emeha UnveRemeha Unvented Flexistor Water Heaters Installation (7038477_issue _01) Pre Serial No 1831nted Flexistor Water Heaters Installation (7038477_issue _01) Pre Serial No 1831...
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