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Comet Combination Unit INSTALLATION & TECHNICAL MANUAL Unit 40 block 5 Third Road Blantyre Glasgow G72 0UP Tel: 01698 820533 Fax: 01698 825697 email: info@electric-heatingcompany.co.uk 3 Contents Page 1. Introduction 4 2. Contents 4 3. Safety 5 4. Installation: Dimensions 6 5. Installation: General 7 6. Hydraulic schematic 10 7. Installation: Plumbing 11 8. Installation: discharge arrangement 13 9. Electrical Connection 15 10. Connection of external appliances & Controls 16 11. Electrical Schematic 17 12. Commissioning 18 13. Control panel - default settings 19 13. Control panel- optional settings with OS 24 14. Annual Servicing 29 15. Guarantee 30 16. Troubleshooting 30 17. Technical data 31 18. Benchmark Service Record 32 4 Thank you for specifying the Comet Combination Unit (hereafter reffered to as the Comet Combi) from The Electric Heating Company. The Comet Combi is an electrically heated direct acting self modulating boiler that is designed for domestic heating purposes, The Comet Combi consists of an electric heating boiler and an indirect unvented hot water cylinder with the necessary safety devices. The Comet Combi Boiler also has an inbuilt programmer that allows you to set your heating and hot water times to suit your life style. This appliance is not intended for use by persons (including children with reduced physical, sensory or mental capabilities, or lack of experience and knowledge) unless they have been given supervision or instruction concerning use of the appliance by the person responsible for their safety. Children should be supervised to ensure they do not play with the appliance. • The Electric Heating Company reserve the right to make minor changes to the specification or design when necessary. • All boilers come with a 24 month warranty that covers all defects originating from faulty materials and workmanship in the manufacture of the boilers. • The warranty covers the replacement of any faulty parts and labour costs. • The warranty will not cover any damage to the boiler from poor or incorrect installation work. • The warranty will not cover any call out charges that have not been authorised by the Electric Heating Company Ltd. • The warranty will not cover water leaks into the boiler. All plumbing joints must be checked. • The warranty card must be completed and sent back to The Electric Heating Company as soon as possible for registration. • An internal Magnetic Filter is fitted to the Boiler and it must be cleaned at least annually. • Failure to clean the Magnetic Filter may result in boiler shut-down, this will not be covered under warranty. • Take care when handling the boiler not to cause any damage to the unit. • The boiler must be stored in a dry place. • Care must be taken when installing the boiler to make sure the floor area will take the boilers full weight when full. • Minimum clearances must be adhered to. 1. Introduction 2. Contents Optional Extras • Comet Combi Boiler • Monoblock Control Set Valve • Room Sensor / Room Stat • External Sensor • Tundish • Installation Manual • Filling Loop • EHC Shower Flow Sensor • Backup Immersion Heater • Solar PV Immersion Heater 5 3. Safety Please read and understand these instructions before installing the Comet Combi. Following the installation and commissioning instructions of the Comet Combi the system should be explained to the customer and all instructions left with them for future reference. • The Comet Combi must be installed in accordance with the manufacturer’s instructions and all relevant regulations in force at the time of installation. • The Comet Combi’s Domestic Hot Water Cylinder is of the UNVENTED type. Its installation is subject to Building Regulation G3 (England and Wales), Technical Standards for (Scotland) or Building Regulation (Northern Ireland). The Installation must be carried out by a competent person qualified to do so. • The Comet combi must be installed into a sealed (pressurised) primary system. Following installation or the primary system the unit should be flushed in accordance with BS7593 and appropriate cleaner & inhibitor added to the system. • The Comet Combi’s hot water cylinder is indirectly heated by the primary heat exchanger located within the unit. • Please note a load check should be taken into consideration when installing high output electrical appliances. • The use of an Off-Peak tariff that provides at least three off peak electricity periods, such as Economy 10 is recommended. Where possible the central heating and hot water should be programmed to coincide with the Off Peak periods available. For more information on tariffs please contact the Electric Heating Company. This appliance must be fitted in accordance with the following instructions. The Local Building Regulations The Building Regulations The Building Standards, (Scotland-consolidated) Regulations. Local water bylaws. British Standards- code of practice 6 4. Installation: Dimensions 630 47 0 60 400mm Min Front 25mm Rear 250mm Min Top Note: Please take care to leave enough space at the front of the boiler for routine maintenance! • Remove the boiler packaging checking the contents are correct. • Take care when lifting the boiler not to cause damage to the outer casing. • Due to the weight of the product the use of a handling device will be required. • The boiler should be handled by minimum two persons with handling device. • Lift the boiler by the internal frame only, do not lift by pipes. • Stooping should be avoided and protective clothing worn. • Packaging is recyclable and should be disposed of approporately. 581 90168 174 5 1773 150mm Side 25mm Side 12060145 7 5. Installation: General 1. General The boiler must be installed by a professional plumber or heating engineer and must be connected to the public low voltage network by a competent person. For systems that require a three phase electrical supply we strongly recommend this is installed by a 17th Edition certified Electrician. The Electric Heating Company will not be held responsible for faulty installations which are performed by unqualified tradespeople. 2. Pipe Connections All Comet Combi Electric Boilers have 22mm Compression pipe connections that are clearly marked. Please note that the boilers are supplied with blank plugs for transit purposes that must be removed before fitting. Mains Inlet, Hot Outlet, Flow & Return connections are clearly marked on the external case, under no circumstances should these connections be reversed. If hot capillary joints are to be used, these joints must be made before connections to the boiler are done. 3. Case Removal Loosen the outer screw at the bottom of the boiler and pull the front cover up & outwards taking care to remove internal earth connections. Earth connections must be re-connected before the boiler case is re-installed. 4. Isolation Valves We recommend that full bore isolation valves are fitted on the Flow,Return & Main Water Supply Pipework. Such valves must be full bore and not “ball valves”. The installation of ball valves in the flow and return pipework will reduce the recommended flow rate through the boiler. 5. Auto air vents An auto air vent is integral within the boiler, however additional air vents will be required at the highest point of the heating system pipework. 6. Boiler sizing Calculate the space heating requirements in accordance with BS EN 12831 and BS EN 1433. An additional allowance of 3kW (10,239 Btu’s) should be made to the ‘space heating’ calculation. 7. Insulation Where practical, and if at all possible, we recommend that all pipework be insulated, in particular the primary pipework within a boiler cupboard. This is to reduce heat loss and reduce high cupboard temperatures from exposed pipework. 8. System Design Allowance should be made for a bypass radiator to be installed within the heating circuit and locked open. This will be located in the room that has the room thermostat installed. To comply with building regulations. 9. Water Connections Provisions must be made for the replacement of water lost from the heating system (sealed systems). Reference should be made to BS EN 14336 for the method of filling and make up of water. There must be no direct connection between the boilers central heating system and the main water supply. When mains water is required to fill the system directly, all local water bylaws must be observed, and any connection made must be disconnected after use. 10. Flushing The system must be flushed to within 10% of mains water PPM to ensure that no debris is trapped in the system as this may result in boiler failure. Where existing radiators and pipe-work are utilized a power flush must be carried out to remove debris. For further guidance please see section - Flushing & System Protection. 11. System pressures All boilers are tested to 4.0 bar. The normal working pressure of the boiler should be set to approx 1.0 / 1.5 bar. All sealed systems should comply with the relevant building regulation sand standards, including BS EN 13831 – Specification for Expansion Vessels. Please note: In order to protect the boiler, it is imperative that the pre-installed magnetic filter is removed and cleaned at least annually. Failure to carry out this action will increase contamination of the boiler by system residue. 12. System types The Comet Combi range of boilers can be used in various system designs. Please refer to The Electric Heating Company for more details on our Comet Combi Boiler for under floor heating. We recommend the use of thermostatic radiator valves on all radiators except in the room that has the wall thermostat fitted. This radiator should be fitted with lock shield valves and left in the fully open position. Systems should be designed to meet the current building regulations in force at the current time. 8 5. Installation; General The following steps will assist in removing the casing for installation & maintenance purposes. Loosen Bottom Screw. Lift & Pull Cover Out At The Bottom To Remove. 3 4 Remove Left Screw. Remove Right Screw. 5 Carefully Lift & Remove Top Section. 1 2 9 5. Installation; General 1 5 8 2 3 9 4 7 6 1 - Expansion vessel 2 - Tundish 3 - Magnetic Filter 4 - Pressure Sensor 5 - Power Board 6 - Pump 7 - Heat Exchanger including AAV 8 - Zone valves 9 - Drain valveNext >