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Air-eau_la_mi_planning_manual_issue_2

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Contact Details Please note that some of the contact details on this PDF document may not be current. Please use the following details if you need to contact us: Telephone: 0844 879 3588 Email: [email protected] The customer support section of our website also features a wide range of information which may be of use to you and is available 24 hours a day. It includes: • Operating and installation instructions • Easy ‘How to use’ guides for storage heaters • Service and repairs • Where to buy our products • Literature downloads • Heating requirement calculator Visit ‐ www.dimplex.co.uk/support A division of GDC Group Ltd Millbrook House Grange Drive Hedge End Southampton SO30 2DF www.dimplex.co.uk Registered No: 1313016 England VAT GB 287 1315 50004 EEE Producer Registration Number – WEE/GE0057TS Paper from sustainable sources LA 6 MI LA 9 MI LA 12 MI LA 16 MI Technical planning manual Inverter air to water heat pump for outdoor installation 08/60393/0 Supporting documents The following documents are available to aid in the planning, installation, operation and maintenance of the Air-eau heat pumps: Technical manuals Contains the necessary information required during the planning stages.   Air-eau inverter heat pumps packages (this document) SmartRad Installation instructions Contains the necessary information required during the installation.     Air-eau inverter air-to water heat pump system packages LA MI settings function & programming overview EC-eau cylinders SmartRad User guides Contains the necessary information for the user for operation and maintenance of the system    Air-eau heat pumps (Pack 1 and 2 – standard heating and DHW) for standard users Air-eau heat pumps (Pack 1 and 2 – standard heating and DHW) for sheltered housing Horstmann wall mounted room thermostat The installation of an Air-eau heat pump should only be carried out by a suitably trained and competent person who is approved by Dimplex. All installations should be in accordance with this planning manual to ensure efficient operation. Page 2 Contents Supporting documents ......................................................................................................................................................... 2 Section 1: Introduction ............................................................................................................................................................. 6 What are the benefits of a heat pump? ................................................................................................................................ 6 How a heat pump works ....................................................................................................................................................... 6 Intended Use ........................................................................................................................................................................ 6 Air as a heat source ............................................................................................................................................................. 6 Advantages of inverter compressors .................................................................................................................................... 6 Advantages of fixed speed compressors .............................................................................................................................. 7 Heat pump labelling .............................................................................................................................................................. 7 Comparison of the LA MS and LA MI ranges ....................................................................................................................... 7 Section 2: Selection and sizing of the heat pump ..................................................................................................................... 8 Process to select a heat pump ............................................................................................................................................. 8 Mono energy operation......................................................................................................................................................... 8 Accurately determining the building‟s heat loss .................................................................................................................... 8 Estimating the building‟s heat loss ....................................................................................................................................... 9 Dimplex design service......................................................................................................................................................... 9 Drying-out of buildings .......................................................................................................................................................... 9 Sizing example 1 ................................................................................................................................................................ 10 Sizing example 2 ................................................................................................................................................................ 10 Section 3: System controls in a domestic setting .................................................................................................................... 11 Boiler inter lock ................................................................................................................................................................... 11 Horstmann PRT thermostat ................................................................................................................................................ 11 Heat Pump Controller ......................................................................................................................................................... 11 Weather compensation....................................................................................................................................................... 11 Section 4: Selection of heat emitters and flow temperatures .................................................................................................. 12 Minimising the flow temperature ......................................................................................................................................... 12 Considerations for fan convectors ...................................................................................................................................... 12 Section 5: DHW preparation with inverter heat pumps ........................................................................................................... 13 Dimplex EC-Eau cylinder range ......................................................................................................................................... 13 Dimplex ECS Combination DHW and Buffer Cylinders ...................................................................................................... 13 Heat pump power for hot water preparation ....................................................................................................................... 13 Selecting a DHW cylinder ................................................................................................................................................... 13 Cylinder volume and reheat................................................................................................................................................ 14 Cylinder replacement ......................................................................................................................................................... 14 Selecting and controlling the DHW temperature ................................................................................................................. 14 Sterilisation ......................................................................................................................................................................... 15 Secondary circulation pipes................................................................................................................................................ 15 Section 6: Installation considerations ...................................................................................................................................... 16 Physical location................................................................................................................................................................. 16 Fixing of the heat pump ...................................................................................................................................................... 16 Wall mounting..................................................................................................................................................................... 16 Ventilation........................................................................................................................................................................... 17 Page 3 Minimum maintenance clearances ..................................................................................................................................... 17 Sound insulation measures ................................................................................................................................................ 17 Air quality............................................................................................................................................................................ 18 Local planning regulation.................................................................................................................................................... 18 MCS Planning Standard ..................................................................................................................................................... 18 Town and Country planning, England ................................................................................................................................ 18 Planning in Wales and Northern Ireland ............................................................................................................................. 19 Town and Country planning, Scotland ................................................................................................................................ 20 Section 7: Heating System Connection .................................................................................................................................. 21 External pipe work .............................................................................................................................................................. 21 Minimum water volume....................................................................................................................................................... 21 Buffer tank .......................................................................................................................................................................... 21 Minimum heating water flow rate ........................................................................................................................................ 21 Taconova flow checker ....................................................................................................................................................... 21 Plumbing connections ........................................................................................................................................................ 22 Frost protection .................................................................................................................................................................. 22 Condensate ........................................................................................................................................................................ 22 Flushing the system ........................................................................................................................................................... 22 Filter ................................................................................................................................................................................... 23 Filling the system ................................................................................................................................................................ 23 De-aeration......................................................................................................................................................................... 23 Adjusting the water flow rate .............................................................................................................................................. 23 Expansion vessel sizing ..................................................................................................................................................... 23 2 port valves ....................................................................................................................................................................... 24 Controlling DHW temperature ............................................................................................................................................ 24 Section 8: Electrical Connection ............................................................................................................................................. 25 Routing of cables within the heat pump .............................................................................................................................. 25 Ducting cables .................................................................................................................................................................... 25 Connection of the power supply to the Heat pump ............................................................................................................. 26 Main power supply cable .................................................................................................................................................... 26 Inline flow boiler.................................................................................................................................................................. 28 Domestic hot water immersion ........................................................................................................................................... 28 Controller cable .................................................................................................................................................................. 29 Connection with the system................................................................................................................................................ 30 Installation of the controller................................................................................................................................................. 30 Section 9: System Health checks ........................................................................................................................................... 31 Heat pump .......................................................................................................................................................................... 31 Electrical ............................................................................................................................................................................. 31 Hydraulic ............................................................................................................................................................................ 31 Cylinder .............................................................................................................................................................................. 31 Wall mounted thermostat.................................................................................................................................................... 31 Heat pump controller .......................................................................................................................................................... 31 Section 10: Standard packages .............................................................................................................................................. 31 Package 1 and 2 ................................................................................................................................................................ 31 Page 4 Package 1 and 2 – Plumbing Schematic ............................................................................................................................ 34 Package 1 and 2 – Micro wiring schematic (option 1 – immersion controlled direct).......................................................... 35 Section 11: Technical specification of the LA MI range .......................................................................................................... 36 Approvals ........................................................................................................................................................................... 37 Performance Data .............................................................................................................................................................. 37 Performance Data .............................................................................................................................................................. 38 CE declaration of conformity .............................................................................................................................................. 39 LA 6 MI performance .......................................................................................................................................................... 40 LA 9 MI performance .......................................................................................................................................................... 42 LA 9 MI performance (continued) ....................................................................................................................................... 43 LA 12 MI performance ........................................................................................................................................................ 44 LA 16 MI performance ........................................................................................................................................................ 46 Product Dimensions LA 6 MI and LA 9 MI .......................................................................................................................... 48 Product Dimensions LA 12 MI and LA 16 MI ...................................................................................................................... 49 LA 6 MI and LA 9 MI Spare parts ....................................................................................................................................... 50 LA 12 MI and LA 16 MI Spare parts ................................................................................................................................... 55 Information for DHW cylinder with buffer - ECS125HP-580 .................................................................................................... 60 Information for DHW cylinder with buffer - ECS150HP/75-580 ............................................................................................... 61 Information for DHW cylinder with buffer - ECS210HP/75-580 ............................................................................................... 62 Page 5 Section 1: Introduction What are the benefits of a heat pump? Persons, especially children, who are not capable of operating the device safely due to their physical, sensory or mental abilities or due to their inexperience or lack of knowledge, must not operate this device without supervision or instruction by the person in charge. Large quantities of pollutants, such as carbon dioxide, sulphur dioxide and nitrogen oxide are released from gas or oil boilers used to heat our homes. A large percentage of our energy supply comes from fossil fuels which have a serious effect on our environment. Fuel security is also an issue as our oil and gas reserves are limited and often from volatile counties around the world. The way electrical energy is generated will change in the future to favour more renewable generation methods. A heat pump uses electrical power that could come from a variety of sources and it uses very efficiently. Air as a heat source The decision whether to install either an air source heat pump or a ground source heat pump depends on the following factors: Investment costs: In addition to the costs for the heat pump and the heat emitter system (radiators and circulation pump), the investment costs are heavily influenced by the costs of tapping the heat source. Air is the easiest heat source to tap as the heat pump is relatively easy to position outside. Tapping the ground as a heat source is more difficult. If the land area is available horizontal loops are the most cost effective way to install the ground collector. If boreholes are used, due to the cost of mobilising the plant, experience has shown that installations with less than 10 boreholes are not economical. How a heat pump works A heat pump converts low grade heat from the environment to high grade heat for space and DHW heating using a refrigeration cycle. Surrounding air is drawn in by the fan and passed over the evaporator. The evaporator cools the air, i.e. it extracts heat from it. This extracted heat is then raised in temperature via the refrigeration cycle and then transferred to the condenser. The heat is “pumped” to a higher temperature level by increasing its pressure with the aid of an electrically driven compressor. Operating costs: Because the energy extracted from the air is transferred to the heating water, this type of device is called an air-towater heat pump. The air-to-water heat pump consists of the main components evaporator, fan and expansion valve, as well as the low noise compressor, condenser and electrical control system. The seasonal performance factors of the heat pump influences the operating cost. These are primarily affected by the type of heat pump, the average heat source temperature and the required heating flow temperatures. Ground source heat pumps have higher SPF‟s compared to air source heat pumps. At low ambient temperatures, humidity accumulates on the evaporator in the form of frost reducing the transfer of heat. The evaporator is defrosted automatically by the heat pump as required. Advantages of inverter compressors An inverter heat pump is able to modulate its‟ heat output over a set range. The inverter compressor modulates its output to keep the return temperature constant. If demand increases the output of the compressor can increase to keep the flow temperature constant. If the demand decreases beyond the minimum setting of the compressor it will turn off until the heating circuit temperature reduces. The refrigerant circuit is hermetically sealed. It contains the Kyoto protocol approved refrigerant R410 with a GWP value of 1725. It is CFC-free, does not deplete ozone and is non-flammable. Correct selection of the heat pump, heat emitters and circulation system is essential for efficient operation of the entire system. A fix speed compressor will run at a constant speed until the set temperature is reached. When the set point is reached the compressor will turn off until the temperature in the heating circuit drops to a hysteresis value. When this value is reached the compressor will restart. The compressor will cycle on and off to maintain the correct temperature. If demand increases the fixed speed compressor will be on more often. Intended Use This device is only intended for use as specified by Dimplex as detailed within this technical manual. The airto-water heat pump is to be used exclusively for the heating of heating water in a closed circuit. Any other use beyond that intended by the manufacturer is prohibited. Even though an inverter compressor cycles less, to ensure optimum life expectancy an inverter compressor should always be installed with a buffer tank to increase run times and store energy for the defrost. Page 6 Heat pump labelling An inverter compressor starts gently ramping up to its maximum speed over a couple of minutes meaning the current increase is very gradual. The fixed speed compressor has a larger starting current because it doesn‟t turn on gradually. The starting current is smoothed by an inbuilt soft-starter to keep it within acceptable limits. The starting current does not cause any problems because an in-built randomised time delay that ensures multiple heat pumps to not turn on at the same time. The product code for the inverter range of heat pumps continues the same convention as the rest of Dimplex‟s heat pump range. Letter An inverter heat pump is able to modulate down its output as the external temperature increases. A fixed speed heat pump will run at a constant speed meaning that its output increases with rising temperature. This means that an inverter compressor could achieve slightly higher cylinder temperatures for the same size coil although in practice both types of compressor can achieve suitable cylinder temperatures. Meaning L Luft (German for air) A Aus (German for outside) ## Nominal kW rating M Mono (German for single phase) I Inverter Table 1: Product coding convention Advantages of fixed speed compressors Comparison of the LA MS and LA MI ranges A fixed speed compressor is designed to work at the optimum performance level all of the time. An inverter compressor does not always work in the optimum zone because it modulates its output to match the heat demand. The „over-driving‟ of an inverter compressor causes it efficiency to drop. The LA MI and LA MS range of heat pumps are ideal for providing DHW and space heating. In addition, the MS range of heat pumps also has a sophisticated controller capable of controlling more complicated systems. Since the output of both the fixed and inverter compressors drop with decreasing temperature, there becomes a point when a secondary heat source is required to match the properties heat demand, known as the Bivalent point. At lower temperatures an inverter compressor and a fixed speed compressor are equally as efficient despite the inverter needing more immersion support. Compressor speed MI range MS range Variable Fixed Heating only Heating & DHW Mixed heating circuits Swimming pool Solar Thermal Boiler integration Multiple heat pump Table 2: Comparison of WPM and MI Range Page 7 Section 2: Selection and sizing of the heat pump Process to select a heat pump MIS 3005 which is required if the installation is going to be MCS approved. 1. Confirm the building is suitable for a heat pump installation as out lined in Section 6: Installation considerations. 2. Accurately determine the buildings heat loss to EN 15316. 3. Decide on the maximum flow temperature. 4. Select the model of heat pump using the output curves to EN14511 The total heat loss is made of two components; the fabric losses and the ventilation heat losses. Fabric heat losses are due to the transmission of heat by conduction though the buildings structure such as windows, walls, roof and floor. Ventilation heat losses are due to warm air escaping the building and being replaced by cold air. It is beyond the scope of this document to give all the necessary values to calculate the buildings total heat loss. This section intends to outline the process to remind the system designer to find the necessary information. Mono energy operation As the weather gets colder, the heat demand of the building increases and the output of the heat pump decreases. There becomes a tipping point where it is so cold outside the output of the heat pump is not able to heat the building alone. The LA MI range of heat pumps are monoenergy heating devices. i.e. in the event of very low external temperatures an electrically operated inline flow boiler will automatically be activated to provide additional heat and keep the building warm. Total heat loss = Fabric losses + Ventilation losses Fabric heat loss (W) = U x A x T 2 Where: U = U value (w/m C) 2 A = Area of the wall, window, ceiling or floor (m ) T = Temperature difference on either side of the insulation (C) The heat pump should fully meet the heat consumption down to a certain external temperature as specified by the NHBC and summarised in Table 3. The MIS 3005 also standard states outside design temperatures for different locations in the UK. To comply with both pieces of advice the system should be designed to operate to the lower of the two design temperatures. If this is not the case, the electrical inline flow boiler will operate more frequently and increase the running costs. Typical U values New build External temperature England and Wales -3C Scotland -5C Walls 0.35 Windows 2.00 Roof 0.18 Floor 0.25 Table 4: Example U values for Fabric heat loss calculation. Further details can be found in Dom 8 - Design of total heating systems. Ventilation heat loss (W) = V x R x T x F 3 Where: V = Room volume (m ) R = Air change rate per hour T = Temperature difference of air in and out (C) 3 F = Ventilation Factor (W / m C) Table 3: External design temperatures (bivalent point) stated by NHBC Bivalent operation is when an additional heat source other that electricity is used to supplement the heat load. Integration of another boiler such as gas, oil or LPG is not possible with the LA MI but is possible with Dimplex‟s WPM range. Accurately determining the building’s heat loss It is essential to accurately calculate the buildings heat loss to ensure the heat pump is correctly sized. The heat loss of a building is calculated using details of the buildings construction, individual room sizes, room temperatures and air change rates. Dimplex recommend calculating the buildings heat loss to the standards defined in EN15316, this is also stipulated in Page 8 Dimplex design service Typical room temperatures Air changes per hour Ventilation factor Dimplex offer a free of charge service to calculate a buildings heat loss along with a full product and accessory specification. Providing we receive the information below, turnaround is usually 7-10 working days. 21 1 0.33 To request this service a form can be downloaded from our website that should be sent in with the following information: 18 2 0.67 Living room Dining room Study Kitchen Bathroom 22 2 0.67 Bedroom 18 ½ 0.17 Hall 18 1½ 0.50 Landing 18 1½ 0.50 W.C      Table 5: Example of values used in the ventilation heat loss calculation. For full details see BS 5449:1990  Plan and elevation drawings [scale 1:50 or 1:100] Construction U values Type of scheme ie: domestic, commercial or industrial Internal and external design temperatures required Details of any special requirements or unusual aspects to the building Alternatively the form and CAD drawings can be emailed to Estimating the building’s heat loss For further information about our design service please visit: Rules of thumb and estimates are suitable for budget purposes but are not accurate enough to calculate the building‟s heat loss in order to select a heat pump. http://www.dimplex.co.uk/products/renewable _solutions/heating_design_service Drying-out of buildings The existing boiler cannot be used as a guide to determine the actual heat consumption because boilers are often over sized. The heat pump is not designed for the increased heat consumption required when a building is being dried out. Some additional heat is available in the form of an inline flow preinstalled in the product. If a building is to be dried out in autumn or winter, we recommend installing an additional temporary heating. However, an approximate estimate can be made on the basis of the existing energy consumption of the living space to be heated and the specific heat consumption. For early budgeting purposes a buildings heat loss can be estimated based upon the floor area. Estimated heat loss(W) = A x E When a house is being built, large quantities of water are normally used for mortar, rendering, plaster and wall paper, which only evaporates very slowly from the building. In addition, rain can decisively increase the humidity in the building's structure. This increased humidity in the entire structure causes an increase in the heat consumption of the house during the first two heating periods. For this reason, buildings should be dried out using specially designed dehumidifiers. 2 Where: A = Floor area (m ) 2 E = Estimated heat loss (W/m ) Estimated heat loss 2 per m 2 High insulation new build 30 W/m New build (2002 regulations) 50 W/m 1970‟s 80 W/m 1930‟s 100 W/m Older than 1930‟s 120 W/m Older than 1930‟s with high ceilings 150 W/m 2 2 2 2 2 Table 6: Typical building heat loss per m2 used to estimate a buildings heat loss Page 9 Sizing example 1 Sizing example 2 Design temperature The property is in Manchester, England – NHBC recommend 3C and CIBSE recommend 2.2C. The design temperature is therefore -3C. Design temperature The property is in Birmingham, England – NHBC recommend 3C and MIS 3005 recommend 3.4C. The design temperature is therefore -3.4C. Building heat loss The properties heat loss is calculated to be 4.5kW at the design temperature. Building heat loss The properties heat loss is calculated to be 5kW at the design temperature. Flow temperature Has been selected at 55C as radiators are going to be installed. Flow temperature Has been selected at 35C as under floor heating is going to be used. The heat pump is dimensioned on the heat consumption of the building at the design temperature as shown in green in Figure 1. The heat pump is dimensioned on the heat consumption of the building at the design temperature as shown in green in Figure 2. Step 1: The building's heat loss is plotted based upon the 0kW @ 21C and the building‟s calculated heat loss at the design temperature i.e. 4.5kW @ -3C as shown by the green line. Step 1: The building's heat loss is plotted based upon the 0kW @ 21C and the building‟s calculated heat loss at the design temperature i.e. 5kW @ -3.4C as shown by the green line. Step 2: At the point where the green line crosses the performance line of the heat pump the blue line can be drawn to show the external temperature that the heat pump will be able to match the heat load of the property which in Figure 1 is -9C. Step 2: At the point where the green line crosses the performance line of the heat pump the blue line can be drawn to show the external temperature that the heat pump will be able to match the heat load of the property which is also 5.9kW at –8C. Step 3: Below external temperatures of -9C the property will require additional heat. The factory fitted 3kW inline flow boiler in addition to the 6kW heat pump to gives 9kW which will support the properties heat load down to the operating limit of the heat pump which is -20C. Step 3: Below external temperatures of -8C the property will require additional heat. The factory fitted 3kW inline flow boiler in addition to the 6kW heat pump to gives 9kW which will support the properties heat load down to the operating limit of the heat pump which is -20C. Figure 1: Example heat output curves to EN14511 for the LA 6 MI for a heat loss of 4.5kW at a design temperature of -3C. Figure 2: Example heat output curves for the LA 6 M for a heat loss of 5.0kW at a design temperature of -1.8C and a the building heat loading being met down to -15C. Page 10 Section 3: System controls in a domestic setting Boiler inter lock The Domestic heating compliance guide sets out the best practise for preventing energy wastage by preventing unnecessary running of the circulation pump and heat pump. of 15C, the ThermoPlus aims to provide maximum comfort to the user and prevent hypothermia and keep a level of background heat. Under the flap the blue standby button will put the control into „frost protection‟ mode until reactivated. Heat Pump Controller The heat pump‟s safe and efficient operation is regulated by the built in controller. The remote panel can be connected via the 15m cable meaning allowing the user to adjust the heat pump settings. External controls should include:  Room thermostat to regulate the space temperature and interlocked with the heat pump unit operation.  Timer to optimise operation of the heat pump An interlock is defined as “controls which are wired so that when there is no demand for either space heating or hot water, the boiler and pump are switched off. The use of Thermostatic radiator valves alone does not provide interlock. Figure 3: Extract from Domestic Heating compliance guide, V1 April 2006 Recommended controller settings can be found in the installation instructions. An explanation of how to set the controller can be found in the programming overview document. Horstmann PRT thermostat The LA MI range of heat pumps achieves boiler interlock using the PRT thermostat. Weather compensation Supplied by Horstmann, the mains powered thermostat is designed to provide an economical but comfortable pattern of heating without the need for complex adjustments by the user. With built in minimum room temperature protection this thermostat is ideal for use with heat pumps because it maintains a base level of heat. The highest flow temperatures are only required during the coldest weather. As the external temperature increases, the heat loss of the build decreases which means that the heat emitters no longer have to work at their maximum output in order to keep the building at the correct temperature. The LA MI is fitted with a weather compensation curve as shown in Figure 4. The curve can be adjusted depending on the system characteristics. By activating weather compensation it ensures the heat pump is always operating at the minimum flow temperature and therefore the maximum efficiency. For day-to-day use only the 3 large buttons on the front of the thermostat are required. The centre „WARM/COOL‟ button, complete with Braille markings, changes the temperature state and the „+‟ and „-„ buttons provide fine user adjustment as well as audible feedback. Each user adjustment is immediately reflected in changes to the bright red and blue LED display. Using a variety of pre-installed heating profiles that can be easily set up by the installer, and a minimum cool setting Page 11 Figure 4: Weather compensation curve on the LA MI Section 4: Selection of heat emitters and flow temperatures Minimising the flow temperature Green areas show suitable heat emitters Example: a domestic fan convector such as a SmartRad can be installed with a flow temperature of 45C. As a rule of thumb, by lowering the flow temperature by one degree, the system performance will improve by 2%. In most oil and gas boiler systems the efficiency doesn‟t vary greatly with flow temperature, therefore the flow temperature is set to around 70°C to 75°C. The high temperatures are not always required as downstream regulator such as mixing and thermostat valves, prevent the building from overheating. To design the most efficient heat pump system it is essential to minimise the flow temperature. When using low flow temperatures the choice of heat emitter is critical to ensure enough heat can be emitted into the room. A number of industry stakeholders have produced a guide to selecting the correct heat emitter, an extract of which is shown in Figure 5. The full guide is available for download from HHIC website. The guide shows that systems with lower flow temperature achieve the highest SPF‟s which would reduce running costs and carbon emissions. Orange areas show that extra caution is advised Example: standard radiators should not be installed with a flow temperature of 60C as a flow temperature of 50C would give the necessary output without causing the radiator to become excessively large. Red areas show that this technology is not suitable Example: under floor heating on a screed floor with a wood covering would not emit enough heat into the room with a flow temperature of 45C. The Heat Emitter Guide is widely available to download on the internet. Hard copies are available upon request by contacting the MarComs team at Dimplex. Figure 5: Extract from the HHIC's guide to heat emitter selection for a heat loss of 80W/m2 Considerations for fan convectors When connecting the SmartRad the same principles should be followed as for any other heat emitter. The minimum flow rate for the heat pump should be observed. For full details about connecting SmartRad to an inverter air source heat pump see the SmartRad planning manual. The benefits of installing SmartRad with a heat pump system are well known and explained in the SmartRad planning manual. This selection deals with connecting SmartRad with the LA MI range of heat pumps. The heating circuit should be designed in such away to maintain the flow to the heat pump even when the part of the circuit is shut off by motorised valves or the heating circulation pump is off. Page 12 Section 5: DHW preparation with inverter heat pumps Dimplex EC-Eau cylinder range EC-Eau, the new range of unvented stainless steel cylinders from Dimplex can supply all the hot water required for the modern home, providing rapid fill baths and invigorating showers to en-suite bathrooms and other domestic appliances simultaneously. Offering low running costs, reliable hot water and fantastic flow rates, EC-Eau cylinders are available in a range of capacities, so there is size to suit even the most demanding household. EC-Eau heat pump cylinders are specified with large, high surface area heat exchangers, specifically sized to match the requirements of Dimplex heat pumps, optimising heat pump efficiency and reducing running costs. The diameter of the EC-eau range has been specifically picked for the UK market with a diameter or 580mm unlike many other cylinders available. Volume Outer diameter 125 580mm 150 580mm 175 580mm 210 580mm 250 580mm 300 580mm Cylinder only Combined buffer and cylinder Table 7: EC-eau cylinders for use with the LA MI range Heat pump power for hot water preparation In addition to the space heating, the demand placed on the heat pump for hot water production must be taken into account when selecting the heat pump. Supplied with an external expansion vessel for improved reliability and reduced cylinder height, ECEau standard cylinders are flexible to site and easy to install. To meet normal comfort requirements, a peak hot water consumption of approximately 60-70 litres per person, per day, should be allowed, based on a hot water temperature of 45°C. Environmental sensitivity and efficient performance are key attributes across the EC-Eau range, which boasts 60mm of low GWP insulation foam and innovative measures such as recessed immersions and thermostats to reduce energy wastage. This combined with the use of 100% recyclable stainless steel inner components and a sleek black, hard wearing outer shell manufactured from completely recycled materials ensures the EC-Eau range looks as good as it performs. The sizing should be based on the worst day, with the coldest possible weather and the maximum possible number of persons using DHW. If this sizing method is not suitable because it causes over sizing of the heat pump, the end user should be made aware that they may sometimes need to use the immersion DHW boost which can be activated from the wall mountable heat pump controller. Dimplex ECS Combination DHW and Buffer Cylinders Selecting a DHW cylinder In addition to all the benefits of the standard cylinder Dimplex can also offer a combination cylinder with a DHW cylinder and buffer cylinder. This makes is easy to retrofit a heat pump as the new combination cylinder takes up the same space as the old cylinder. A standard DHW cylinder is not suitable for use with heat pumps due to the small coil size. A heat pump provides lower hot water temperatures compared to a boiler. For this reason a heat pump cylinder needs a larger coil to ensure that the heat can be transferred from the heat pump in to the water within cylinder as efficiently as possible. The EC-eau range of combined buffer and DHW cylinders have the buffer cylinder on top which gives the following benefits:   For all heat pumps, the achievable cylinder temperature is affected by the maximum flow temperature and also the kW output of the heat pump. Since the kW heat output of an inverter air source heat pump does not rise with air temperature the LA MI heat pump can achieve 45°C in all of the cylinders shown in Table 8. The buffer acts as an excellent air separator, and putting at the top of the cylinder means it is likely to be one of the highest points in the system allowing air to easily be removed. The heat loss is reduced from the combination cylinder because there is less of a temperature gradient between the cylinder/buffer compared to the cylinder/ambient air. If a different cylinder temperature is required the following must be taken into account. For each of Dimplex‟s heat pump cylinders, a graph of kW input vs Page 13 attainable cylinder is published. In conjunction with the published information of the minimum output at A25/W55 for each heat pump the attainable cylinder temperature can be found. The flow rate though the cylinder coil is an important factor in determining the achievable cylinder temperature. The hydraulic resistance of the coil and connecting pipe work must be checked to ensure that the circulation pump pre-installed in the LA MI is able to achieve the necessary flow rate. Cylinder model 45C achievable with correct flow rate ECS125HP-580 Yes ECS150HP-580 Yes LA 6 MI ECS175HP-580 Yes (Flow rate 1.0m3/h) ECS210HP-580 Yes ECS250HP-580 Yes ECS300HP-580 Yes ECS125HP-580 Yes ECS150HP-580 Yes ECS175HP-580 Yes ECS210HP-580 Yes ECS250HP-580 Yes ECS300HP-580 Yes ECS125HP-580 Yes ECS150HP-580 Yes ECS175HP-580 Yes ECS210HP-580 Yes ECS250HP-580 Yes ECS300HP-580 Yes ECS125HP-580 Yes ECS150HP-580 Yes LA 16 MI ECS175HP-580 Yes (Flow rate 2.8m3/h) ECS210HP-580 Yes ECS250HP-580 Yes ECS300HP-580 Yes Heat Pump LA 9 MI 3 (Flow rate 1.6m /h) LA 12 MI 3 (Flow rate 2.1m /h) It should be noted that the cylinder reheat times will be longer with a heat pump compared to a typical gas boiler. This is because a gas boiler is often drastically oversized compared to the space heating requirement whereas a heat pump is sized much closer to the heat pump. For this reason, it may be necessary for a heat pump cylinder to be larger than a cylinder installed with a gas boiler. The amount of stored hot water should be adequate to meet the demands of the property. The installer should gauge the likely hot water use depending upon the type of showers, baths and taps installed within a short time and select an appropriately sized cylinder. 6kW 9kW 12kW 16kW ECS125HP-580 44 29 22 16 ECS150HP-580 52 35 26 20 ECS175HP-580 61 41 31 23 ECS210HP-580 73 49 37 27 ECS250HP-580 87 58 44 33 ECS300HP-580 105 70 52 39 Table 9: Calculated cylinder reheat time with different heat pumps Cylinder replacement If a heat pump is being installed on to an existing property it is likely that the old hot water cylinder will have to be replaced with a new one with a larger coil. In addition to the instructions supplied with the cylinder, when planning on replacing an old vented cylinder for a new unvented stainless steel cylinder it is important check the following:   The water main is capable of supply adequate pressure and flow rate at all times of the day. The fittings such as taps and valves are suitable for the new higher pressure system. Selecting and temperature controlling the DHW It is important that the customer understands that the maximum flow temperature out of the heat pump is higher than the maximum attainable temperature in the cylinder. Table 8: Cylinders suitable for use with the LA MI range with an external temperature up to 25°C. Cylinder volume and reheat Heat pump output The heat pump controller monitors the temperature in the DHW cylinder via a sensor and decides when to work in hot water mode. The user can set the time of DHW production and also the temperature of DHW product using the wall mountable controller. Page 14 For efficient operation the DHW temperature should be set to 45°C. Experience has found that this is more than hot enough for showering and bathing. It is important to explain to an end user about the correct cylinder temperature for economic operation of the heat pump. They may have previously been used to scolding hot temperature that they mixed with cold water. If required, the hot water temperature can be set up to 75ºC although this will utilise the immersion heater for some of the heating period. By raising the storage temperature, the volume of usable water is increased which is useful is properties where a larger cylinder can‟t physically be fitted. The maximum temperature that the compressor can achieve before the immersion needs to finish the demand is variable based upon a number of factors. In practice the LA MI heat pump is able to reduce its kW output using the inverter compressor and can also maintain its output above 55ºC for a short period of time. It is therefore, not uncommon for the LA MI to achieve cylinder temperatures of 50ºC using only the compressor. It should however be noted that other factors within the system can reduce the attainable cylinder temperature so the customer expectation should be managed to expect their hot water to be stored at 45ºC. Sterilisation The schedule for sterilisation should be determined by the installer to comply with the necessary regulations. For Domestic properties there is no official guidance on the correct storage temperature or if thermal sterilisation is required. There is a theoretical risk of legionella growth, although no cases have yet been reported in a domestic hot water system. There is a trade off between maximising system efficiency by reducing energy consumption and minimising the theoretical risk of legionella growth. The risk of legionella growth can be minimised by ensuring that the cylinder does not remain stagnant for long period of time. If the property is not occupied for a long period, upon reoccupation, it would be prudent to raise the cylinder temperature to 60°C and open the water outlets to allow the connecting pipe work and outlets to be sterilised. For private domestic properties, Dimplex recommend that the cylinder is raised to 60°C once per week although the ultimate decision lies with the householder to weight up the risk with the energy saving benefits. For commercial properties the legislation requires for the water to be stored at 60C. The water drawn off immediately after sterilisation will be much hotter than usual. Consideration should be given to installing a temperature limiting device at the outlets to prevent scolding. Setting the hot water temperature higher than the heat pump alone can do with the compressor would cause the immersion to operate. The adjustable dial on the cylinder thermostat is not wired in or used because the temperature of the cylinder is controlled by a sensor. A notice such as that shown in Figure 6 should be attached next to the cylinder thermostat. TEMPERTURE ADJUSTMENT The temperature of the hot water in this cylinder is set using the wall mounted heat pump controller. The setting shown on this thermostat does not affect the hot water temperature. Figure 6: Notice to be fixed next to cylinder thermostat Note that the manually resettable high temperature cutout in the cylinder thermostat is wired back to the heat pump for G3 protection. Secondary circulation pipes A secondary circulation pipes is used to continuously pump hot water around a closed loop, so that there is not a long period of time from the taps opening to the hot water being available. All of the EC-eau range of cylinders larger than 210L feature a boss for connection of a secondary return. Heat consumption for a circulation pipe can be considerable. The increase in consumption depends on both the length of the circulation line and the quality of the pipe insulation and on a large system should be taken into account to ensure the heat pump is suitably sized. To maximise the efficiency of the system, if a circulation system cannot be dispensed with because of long pipe runs, the circulation pump should operate on a timed basis. Page 15 Section 6: Installation considerations When deciding the location to install the heat pump the items contained within this chapter should be considered. Suggested dimensions of concrete pads as shown in The installation of an air source heat pump should be carried out by a Dimplex Accredited installer. Physical location The heat pump is for outdoor installation only. It should also be installed in a place where:     The condensate can easily be drained away. Hydraulic connections can easily be made to the heating system and the DHW cylinder. There is no risk of a flammable gas leak or any outlets vents from any other system. The wiring lengths come within reasonable ranges particularly taking note of the 15m controller cable. Fixing of the heat pump The heat pump should be fixed on two flat, horizontal and solid hard surfaces such as concrete pads that are capable of taking the unit‟s weight and draining the condensate. To prevent tipping, the heat pump must be suitably fixed. The fixing should be strong enough to prevent the unit from tipping over if the base becomes unlevel over time. Figure 7. A 152 B 1002 C 300 D 356 E 400 F 520 G 400 H 600 When installing the product in a place where it will be affected by strong wind such as wind blowing between buildings or on a rooftop an overturn prevention wire supplied by the installer may be necessary. Wall mounting If the heat pump is to be wall mounted a condensate collection tray (supplied by the installer) should be fixed under the heat pump. The pipe from the tray to a suitable drain should be heated so that it can‟t freeze and become blocked. Page 16 Figure 7: Top view of two concrete mounting blocks that allow the condensate to drain away via a gravel soak away. Ventilation The installation site must be an open location clear of any obstacles which may cause a short circuiting of the discharged air or increased resistance due to blocking of the inlet or outlet. This includes walls and fences as well as locations prone to blocking debris such as leaves or snow. Avoid installing the heat pump in a location where suction side of the fan may be exposed directly to wind. If the location is in open ground, the heat pump should be set up so that the air outlet direction of the fan is perpendicular to the main wind direction to allow unrestricted defrosting of the evaporator. Figure 9: Minimum clearances for maintenance (not including clearance for air circulation) Sound insulation measures The installation may also have to comply with the MCS 020 standard as detailed in the section on the next page. Furthermore, the heat pumps should be installed in a location considering the following:    Figure 8: Minimum distances to objects to ensure adequate ventilation Minimum maintenance clearances It must be possible to carry out maintenance work without hindrance the displayed in Figure 9 should be observed. For example if the unit is installed on a balcony there must be a space measuring 1000mm in front of the unit of maintenance. the occupant‟s enjoyment of the garden and outside spaces. any windows that open close to the heat pump. The effect on neighbouring properties. The lowest noise emissions are achieved if an area of 35m surrounding the heat pump does not have any hard surfaces that can reverberate the sound. Additionally, the foundation can be covered up to the level of sledge on the heat pump with sound-absorbing material such as bark, plants or grass. These must not affect the air flow or and care must be taken so they don‟t get sucked into the fan. If the heat pump is installed above inhabited rooms, measures to prevent solid-borne sound should be considered. Page 17 Air quality If heat pump is subject to any of the following substances in the air its‟ life span will be shortened and the guarantee may not be valid. If the air contains any of the following, please contact Dimplex for further information:     Figure 10: Q factors for different surfaces within 1 meter of the LA MI. Table 10 and Table 11 show the minimum distance to achieve the 42bB at the assessment position in the MCS 020 calculation. A weighted sound power level Q2 Q4 Q8 LA 6 MI 58.0dB(A) 2m 2m 3m LA 9 MI 61.5 dB(A) 2m 3m 4m LA 12 MI 62.0dB(A) 2m 3m 4m LA 16 MI 64.0dB(A) 3m 4m 5m Sulphur i.e. Near a busy congested road. Oil i.e. a workshop. Ammonia i.e. animal stables Salt i.e. near the sea. The above conditions will affect all the exposed components within the heat pump, but especially the evaporator. Dimplex offer an extra service to coat the evaporator with a protective coating. This additional service adds a week to the delivery times. For more details contact the Dimplex technical team. Table 10: Minimum distances to achieve 42dB if there is a wall between the heat pump and assessment position Local planning regulation Every effort has been made to give accurate advice on local planning regulations for England, Wales and Scotland. The following information is provided with the intension of making the installer aware that such regulations exist rather than a definitive guide. It is essential that the installer verifies the regulations with the local planning office before proceeding with the installation. MCS Planning Standard The MCS planning standard sets out the method by which to calculate if the installation would meet the noise limit of 42bB. If the assessed noise level is greater than 42dB the installation may only still go ahead if planning permission is granted by the local authority. The value of the noise level at the assessment position is affected by:     The A weighted sound power level of the heat pump as given in the technical information The directivity Q factor as determined by the number of walls as shown in Figure 10. The effect of solid barriers between the heat pump and the assessment position. The back ground noise level. A weighted sound power level Q2 Q4 Q8 LA 6 MI 58.0dB(A) 4m 6m 8m LA 9 MI 61.5 dB(A) 8m 10m 15m LA 12 MI 62.0dB(A) 8m 10m 15m LA 16 MI 64.0dB(A) 8m 12m 20m Table 11: Minimum distances to achieve 42dB if there is NOT a wall between the heat pump and assessment position Compliance with the MCS Planning Standard on its own does not bestow permitted development rights – there are a number of other conditions and limitations which must be complied with for an installation to be permitted development, some of which are detailed below. For further information see the MCS document 020, “MCS Planning Standards For permitted development installations of wind turbines and air source heat pumps on domestic premises.” Town and Country planning, England The following is a summary of the main points for an Air source heat pump under the Town and country planning act. The installer should consult the original document for further clarification and a full list of points. The act states that planning permission would be required if the:    Page 18 Installation doesn‟t comply with the MCS planning standard. Installation would result in more than one air source heat pump on or within the grounds of the building. Site already has a wind turbine.         Heat pump will be within 1m of the property boundary. Heat pump is installed on a pitched roof or 1m from the edge of a flat roof. Proposed site is a scheduled monument, listed building, conservation area or world heritage site. Installed on a wall or roof which fronts the highway Heat pump ss closer to the road than the property The heat pump is installed above the level of the ground storey. The heat pump is used solely for heating purposes. 3 external unit is greater than 0.6 m in size (all LA MI units pass this test) For further information see the “Town and Country Planning (General Permitted Development) (Amendment) (England) Order 2011, No. 2056” Planning in Wales and Northern Ireland Air source heat pump installations in Wales and Northern Ireland require planning permission as there are no permitted development regulations. Page 19 Town and Country planning, Scotland A domestic installation of an air source heat pump in Scotland will be classed as a Permitted Development, unless:    It would result in the presence within the curtilage of a dwelling of more than one air source heat pump The air source heat pump would be situated less than 100 metres from the curtilage of another dwelling The air source heat pump is visible from the road in a conservation area or would be within a World Heritage Site or the curtilage of a listed building. In addition, before beginning the development the developer must apply to the planning authority to:   determine whether the prior approval of the authority will be required for the siting and external appearance of the air source heat pump Find out if the application needs to be accompanied by a range of other information and a if any number of other conditions apply. For further information see the “The Town and Country Planning (General Permitted Development) (Domestic Microgeneration) (Scotland) Amendment Order 2010, No. 27.” Page 20 Section 7: Heating System Connection As a rule of thumb 28mm pipe work should be used although the sizing of the pipe work remains the responsibility of the installer. When connecting the heating system, all applicable regulations must also be adhered to including all relevant European and national regulations (including EN61770), and local building regulation codes.  Work that requires the covers to be removed must only be carried out under supervision of qualified contractor, installation engineer or service person. The installation of an air source heat pump must be carried out by a Dimplex Qualified installer. External pipe work The pipe work running from the heat pump into the property should be sufficiently insulated to minimise the heat loss and consideration should be given to using the correct material. Minimum water volume The minimum water volume of the system is 50 litres which must always be available when in heating mode even if all of the zone valves are closed and additional circulation pumps are off. This is typically achieved by installation of a buffer cylinder. If a buffer cylinder is not present there may be problems during a defrost, namely the heating distribution system going cold and electric immersion being required to bring it up to temperature. To minimise energy consumption the pump should run of the lowest speed possible whilst still achieving the correct flow rate. The resistance of all the pipe fittings, filter, heat emitters and condenser must be taken into account. Failure to observe the minimum water throughput will cause the heat pump not to work due to operation of the flow switch alarm (H62). The maximum water throughput is 20% more than the stated minimum water throughput. Exceeding the maximum flow rate would result in an inefficient system operation due to increased pumping losses. For systems in which the heating water flow can be shut off via actuators or thermostatic valves an overflow bypass valve must be installed to guaranteed to minimum water flow rate. Taconova flow checker The Taconova flow checker is provided in every system package to provide a simple way to verifying that the flow rate is correct. The flow rate is read on the bottom of the spinner as shown in The internal volume of the heat pump is 5L. Buffer tank The integration of an air-to-water heat pump requires a buffer tank connected in series to ensure that the evaporator (finned heat exchanger) is defrosted by means of reverse circulation. Installation of a buffer tank connected in series also lengthens the runtimes of the heat pump during periods of reduced heating demand. Figure 11: Correct reading of flow rate on the taconova flow checker Minimum heating water flow rate performance data table‟ must be observed. following factors should be considered:  The Hydraulic resistance of the pipe work. Special attention should to given to ensure the correct pipe diameter is chosen considering the required flow rates. The flow checker should be installed in a visible location inside the property and as close to the heat pump flow as possible. In order given an accurate reading the pipe installation distances shown in Figure 12 should be observed as well as the flow direction as shown in Figure 13. Page 21 It is important to install the flow checker on the flow pipe so it is protected from impurities within in the system via the filter on the heat pump return. Figure 12: Minimum straight pipe distance before entrace to Taconova unit The installer should conduct a risk assessment to determine the likelihood of water freezing in the heat pump and interconnecting pipe work in the event of a power failure during cold weather. The heating circuit should be dosed with suitable antifreeze if heat pump system is in a building where a power failure cannot be detected or the occupants would be unable to drain the system. If antifreeze is used the concentration should be large enough to prevent freezing for the coldest local temperature and the installer should ensure the glycol is vented to a suitable place to prevent contamination of the environment or sewage system in the event the pressure relief valve activating. Condensate During normal operation the heat pump will remove water vapour from the air. The condensate will run down the evaporator into the condensate tray where it will drain out of the unit. Defrosting takes place up to 16 times per day, with up to 3 litres of condensed water being produced each time. Figure 13: Ensure the flow rate through the Taconova is in the same direction as the arrow Plumbing connections Model Fitting size Torque LA 6 MI LA 9 MI 1 ¼” male flat face Condensed water that forms during operation must be drained off frost-free. The heat pump must be mounted on a level surface to guarantee proper drainage. The condensate such drain onto a surface such as gravel. If a tray is used to funnel the condensate, the drainage pipe must have a minimum diameter of 50mm and should be fed into a frost free trap and then a sewer for rain water to ensure that large quantities of water can be drained off. 118 Nm The condensate must drain on to an surface that is freely draining. It must not drain on to footpaths or patios as it could refreeze and become a hazard. LA 12 MI LA 16 MI Table 12: Water connections on LA MI Frost protection So long as the heat pump is connected to the mains electrical supply the automatic antifreeze function will prevent the water in the pipes freezing during cold weather. In case of a prolonged power supply failure or a circulation pump failure the system must be drained using the screws on the flow and return connections. When water is idle inside the system, freezing up is very likely to happen which could damage the system beyond economic repair. Flushing the system It is advisable to fit specific connections for flushing and filling as shown in the plumbing schematics. Before connecting the heating water system to the heat pump, the heating system must be flushed to remove any impurities and residue from sealants, etc. Any accumulation of deposits in the condenser could reduce the heat pumps performance. Do not use worn out piping that may have become blocked over time. Ensure that impurities are not flushed though the heat pump since they could block the channels in the condenser. Page 22 Filter It is essential to install a filter immediately before the water inlet to the heat pump. Not installing this filter would invalidate the warranty of the heat pump as debris can easily block the condenser channels. The MFK114 isolation valve as shown in Figure 14 is included in the heat pump packages. The valve can be closed and the filter removed and checked without having to drain the system. Figure 16: Location of pressure relief valve Figure 14: Isolation valve and filter supplied in LA MI packages to be fitted to the heat pump return. Figure 17: Pressure relief valve Adjusting the water flow rate Figure 15: Isolation valve supplied in package to be fitted to the heat pump flow. Filling the system The system should be filled with potable water. The system water should be treated with standard central heating inhibitors. The cold fill gauge pressure on the heat pump should be between 0.8 and 1.5 bar (0.08-0.15MPa). This will rise during normal operation. The default setting is moderate speed (III). The circulation pump must be adjusted to give a suitable flow rate to maximise system operation. The heat pump should be turned on and the compressor allowed to reach maximum frequency. Once this frequency is reached the pump speed should be adjusted so the difference between the flow and return is as close to 5C as possible. If the difference is greater than 7C this would potentially cause nuisance tripping of the flow alarm. Expansion vessel sizing The heat pump comes with an expansion vessel installed as shown in Table 13. Dependant on the static height of the system and the volume it may be necessary to install a second expansion vessel. De-aeration Depending upon the specific system the installer must determine if a second expansion vessel is required. Air trapped in the system causes air locks which in turn cause poor water flow around the system. Every high point in the system should have a means of bleeding out air which is supplied by the installer. The pressure relief valve shown in Figure 17 can be used to purge the air from the heat pump during filling. Page 23 Controlling DHW temperature Expansion vessel size Pre-charge LA 16 MI 10L LA 12 M 1 bar LA 9 MI 6L LA 6 MI Table 13: Size of expansion vessel in the LA MI range For most installations the 10L expansion vessel should be able suitable with a volume up to 200L and a static height of 7m. The 5L expansion vessel should be suitable for a system volume up to 100L and a static height of 7m. The cylinder temperature is controlled via an NTC2 sensor. For safety reasons the heat pump controller also checks for continuity from the DHW thermostat. The temperature regulation thermostat and high limit stat are wired in series. To keep the contacts closed on the regulation stat the dial must be set to maximum. The contacts on the high limit stat will remain closed during normal operation. If the heat pump does not detect continuity across both the regulation stat and high limit stat an H91 error will occur. The thermostat on the cylinder should not be modified to disable the regulation stat or high limit stat. 2 port valves The heat pump packages include 2 x F228 Horstmann two port valves as shown in Figure 18 to switch between space heating and domestic hot water mode. Fit the valves ensuring that the actuator head is not below the horizontal level of the pipe work and that the flow is in the direction of the arrow. Remember to make allowances for maintenance and replacement. A label similar to that shown in Figure 6 should be supplied by the installer and fixed on the cylinder to let the user know. TEMPERTURE ADJUSTMENT The temperature of the hot water in this cylinder is set using the wall mounted heat pump controller. The setting shown on this thermostat does not affect the hot water temperature. For normal operation the dial should be set to the maximum position. Figure 19: Notice to be supplied by the installer and fixed next to cylinder thermostat Figure 18: Dimensions of F228 valve The F228 valves have been specifically selected for their fast operating times. When switching from heating to DHW the heat pump flow must not be restricted. If a different valve is used, the valve must be fully open within 6 seconds of being switched. Page 24 Section 8: Electrical Connection When connecting the heat pump to the power supply, the relevant EN standards must be complied with. Any further connection requirements stipulated by local utility companies must also be observed. It is important that the hydraulic connections have been completed prior to switching on the power supply. Depending upon the installation the heat pump could have the following cables that it will be necessary to route from the heat pump into the property. 1. 2. 3. 4. 5. Routing of cables within the heat pump   To avoid the electrical cables becoming damaged by sharp edges they must exit through the bushing located at the right side of the heat pump. The cables must be secured using the clamp on the control board. Ducting cables To access the electrical connections only the front right hand panel of the heat pump outer casing needs to be removed as shown in Error! Reference source not found.. Main power supply cable Heat pump controller Communication cable for 2 way valves, high limit stat etc, room thermostat. Domestic hot water sensor Domestic hot water immersion heater (booster heater) For typical wiring and hydraulic schematics see section 16 at the end of this document. Ducting should be used to ensure that the enclosed cables are protected from the effects of weather, mechanical snagging or wear, rodent damage ect. The ducting should be positioned in such away to ensure that water will not track along the ducting and into the heat pump or property. Figure 20: Correct cable routes though heat pump Page 25 Connection of the power supply to the Heat pump LA 6 and 9 MI LA 12 and 16 MI Figure 21: Connection of the power supply cable Main power supply cable The power connection of the heat pump is made via a standard 3-core cable. The cable has to be supplied by the installer and the wire cross-section is to be selected according to the power consumption of the heat pump as shown in Table 14. Similarly, the main circuit breaker (MCB) at the distribution board should be correctly rated as shown in Table 2. For maintenance purposes the power supply of the heat pump must be equipped with an isolating device in the vicinity of the heat pump. The isolating device must have a contact gap of at least 3mm. In addition to the maintenance isolator an automatic 2-pole automatic circuit breaker should be installed. The heat pump should only be connected to a permanent mains supply. The maximum current carried in the supply cable must be calculated using Table 2 depending upon the how the heat pump is configured. For example, it is not always necessary to connect the inline flow boiler. In other installations where there is no DHW cylinder is not necessary to connection the DHW immersion. Every installation will require power to RCCD 1 (compressor and control circuits). Once the maximum supply current is known the installer must then supply a suitably rated cable depending upon the run length and the type of environment where it will pass. Page 26 RCCD 1 RCCD 2 MCB In line flow boiler In line flow boiler + + DHW immersion switched by heat pump DHW immersion switched by a relay controlled by the heat pump or no DHW immersion installed 21A 26A 13A   Compressor & controller LA 6 MI   23A 26A   LA 9 MI LA 16 MI Suggested „type C‟ MCB rating 47 50 34 50 49 50 36 50 13A  LA 12 MI Total running current (Amps)  RCCD 1 RCCD 2 RCCD 3 MCB Compressor & controller In line flow boiler DHW immersion switched by heat pump DHW immersion switched by a relay controlled by the heat pump or no DHW immersion installed 25A 26A 13A 0A      27A 26A 13A        Total running current (Amps) Suggested „type C‟ MCB rating 51 63 64 80 53 63 66 80 Table 14: Calculation of running current for entire heat pump to size power supply cable and MCB at distribution board. Page 27 Inline flow boiler If the inline flow boiler is not wired in the frost protection function will not fully function. The circulation pump will run but no additional heat will be added to the system by the inline flow boiler. This increases the risk of the water in the system freezing. 2. Using an insulated tool to gently push the centre button on the OLP. 3. Replace the OLP cover. Domestic hot water immersion The heat pump is capable of switching a 3kW immersion directly without the need for an additional relay as shown on the standard wiring diagram. Depending upon the wiring runs it may be more suitable that the heat pump switches a relay rather than the immersion directly as shown in Figure 23. This would mean that the cable from the heat pump to the cylinder could have a lower current rating and therefore, could be combined with the multi-core cable rather than run a separate cable. Figure 22: Manual reset on the over Inline flow boiler The OLP located on the inline flow boiler, as shown in Figure 22 prevents the water from overheating. Before manually resetting the cause of tripping should be rectified. The OLP can be manually reset by: 1. Removing the OLP Cover. This method is particularly useful in retro-fit applications where the existing cylinder already had an immersion heater and high current supply fitted. If this is the case the installer should supply an inline fuse rated at an appropriate current for the relay selected and the maximum current rating of the multicore cable as shown in Figure 23. Figure 23: Wiring for Heat pump to control DPCO relay to switch supply for immersion Page 28 Controller cable The controller cable is connected to the heat pump controller using the two rectangular plug connectors as shown in Figure 24. The cable cannot be extended because this would increase the resistance and correct operation of the controller cannot be guaranteed. The cable is 15m long but 1.5m is required inside the heat pump leaving 13.5m for routing to the controller. The cable is included with-in the scope of supply. The power for the controller is supplied from the heat pump. Figure 26: Terminals of the extension lead and 15m controller cable Each end of the controller cable is different. Make sure you install it the right way around! Figure 24: Connection terminals on the controller cable to controller inside the property. The controller cable is connected to the heat pump via a short extension lead which protrudes from the heat pump as shown in Figure 25. The controller cable connects to the extension cable as shown in Figure 26. Figure 25: Location of the extension cable for connection of the 15m controller cable Page 29 Connection with the system The following section contains general information about the communication connections. Full wiring diagrams and hydraulics for standard systems are available in Section 16. Figure 27: Heat pump communication connections External controller cable This can be used to remotely put the heat pump in standby mode upon breaking the connection from an external control device. When in standby the heat pump frost protection will still be activated. To enable this function a factory fitted jump lead between terminals 17 and 18 must be removed. 2 x Two way valves 2 x two-way valves are necessary if the heat pump needs to switch mode from space heating to domestic hot water production. Booster (Immersion) heater This is the immersion heater installed in the DHW cylinder. It immersion can either be switched directly by the heat pump or a relay can be fitted locally to the cylinder as shown in Figure 23. The receiver cable is used to communicate a heating demand to the heat pump from a device such as a wall mounted thermostat. Receiver Cable Connection of the receiver cable is essential to provide „boiler interlock‟ to comply with building regulations. Tank OLP If the heat pump is doing DHW, the over load protection is connected to the manually resettable high limit stat on the DHW cylinder. Using this connection is a way of comply with G3 building regulations. If such connection is deemed unnecessary a jumper must be connected across these terminals if the heat pump is programmed for DHW production. The tank sensor is essential for DHW production because it monitors the temperature in the DHW cylinder. The DHW sensor must be an NTC-2. This sensor is supplied as part of the standard package. Tank Sensor To comply with wiring regulations it might be necessary for the sensor cable to be different cable from the other communication cables since it is extra low voltage and the other cables carrying 240V. Installation of the controller  The controller should be installed:   In a place which is away from direct sunlight and high humidity. On a flat surface to prevent warping of the remote controller and damage to the LCD screen.  Page 30 Where the LCD can be easily seen for operation. (Standard height from the floor is 1.2 to 1.5 meters.) In a location where the cable can be fed though the wall or to the surface of the wall and attached in such a way as not to cause snagging. Section 9: System Health checks   Before opening the device, ensure that all circuits are isolated from the power supply. Cylinder Any work on the heat pump may only be performed by authorised and qualified aftersales service technicians.   The following items should be verified to ensure efficient operation of the system:  Heat pump Wall mounted thermostat  Check the fan is clear from debris. No abnormal sound during operation.   Electrical     Power cable is firmly fixed. Earth wire connection is secure. RCCB operation is normal. Supply voltage is correct. Every 2 years, replace the battery on the Horstmann PRT1 Heating operation normal. The set temperatures and heating periods are suitable for the tenants life style. Heat pump controller   Hydraulic   Set temperature is correct for efficient operation. Check the high temperature cut out stat on the cylinder immersion and buffer immersion have not tripped. Temperature and pressure relief is operating correctly. For full maintenance details for the cylinder consult the relevant instruction manual. Never use cleaning agents containing sand, soda, acid or chloride as these can damage the surfaces.   The filter is clear of debris. Check entire system for leaks. LCD control panel operation is normal. Enquire if the user is warm enough and reduce the weather compensation curve to maximise the heat pump efficiency. Water pressure higher than 0.05 MPa. Pressure relief valve operation is normal. Section 10: Standard packages To assist with the design and installation of a system Dimplex have collated wiring and hydraulic schematics for the following designs: Package 1 and 2 Package 3  Heating and Domestic hot water preparation is done using the heat pump.  2 x two port valves are used to switch between heating and DHW preparation.  Room temperature is time and temperature controlled using the Horstmann wall mounted thermostat. The thermostat will create a demand if the temperature drops below 15C whilst the system is off to prevent the base temperature dropping too low.  DHW temperature and time period is set using the Heat pump controller.  Package for space heating only so no hot water cylinder is included.  Buffer cylinder is required to ensure minimum water volume.  Room temperature is time and temperature controlled using the Horstmann wall mounted thermostat. The thermostat will create a demand if the temperature drops below 15C whilst the system is off to prevent the base temperature dropping too low. Page 31 Component parts of kits Kits available for selection by installer 1 1 2 1 1 1 1 2 1 1 1 1 1 2 1 1 1 1 2 1 1 1 1 2 1 1 1 1 PK3LA 16 MI PK3LA 12 MI PK3LA 9 MI PK3LA 6 MI PK2LA 16 MI - 300 PK2LA 16 MI - 250 PK2LA 12 MI - 300 PK2LA 12 MI - 250 1 1 1 1 1 2 1 1 PK1LA 16 MI - 210/75 1 PK1LA 16 MI - 150/75 1 PK1LA 16 MI - 125/75 1 PK1LA 12 MI - 210/75 1 PK1LA 12 MI - 125/75 1 PK1LA 12 MI - 150/75 1 PK1LA 9 MI - 210/75 1 heating zone with buffer tank PK1LA 9 MI - 150/75 1 heating zone and DHW with separate buffer and DHW cylinder PK1LA 9 MI - 125/75 1 heating zone and DHW with combined buffer and DHW cylinder PK1LA 6 MI - 210/75 Pack 3 PK1LA 6 MI - 150/75 Pack 2 PK1LA 6 MI - 125/75 LA 6 MI LA 9 MI LA 12 MI LA 16 MI PRT1 wall thermostat NTC 2 DHW sensor Two port valve Flow setter Isolation and filter valve 100L buffer cylinder ECS125HP/75-580 ECS150HP/75-580 ECS210HP/75-580 ECS250HP-580 ECS300HP-580 Pack 1 1 1 2 1 1 1 1 1 2 1 1 1 1 1 2 1 1 1 1 1 1 1 1 2 1 1 1 1 1 2 1 1 1 1 2 1 1 1 1 1 1 2 1 1 1 1 1 1 2 1 1 1 1 1 1 1 1 1 Table 15: Contents of the Air-eau heat pump packages Page 32 1 1 1 1 2 1 1 1 1 1 1 1 1 1 1 2 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 Pack 1 1 heating zone and DHW with combined buffer and DHW cylinder Pack 2 1 heating zone and DHW with separate buffer and DHW cylinder Pack 3 1 heating zone with buffer tank Concrete base, fixing bolts, condensate drain method or wall mounting brackets Interconnecting pipe work Ducting for wiring and pipe work Air purge valves at every high point Switch for isolation of heat pump during maintenance Multi core cable for connection of wiring centre to heat pump 2 core cable for connection of DHW sensor 3 core cable for connection of DHW immersion heater to heat pump Relay for switching immersion heater and 2 core cable No Depends upon schematic. Either cable or relay required. Depends upon schematic. Either cable or relay required. No 3 core cable for mains supply from Distribution board to Isolation switch. Expansion vessel An expansion internal vessel is supplied, an addition one may be required depending upon system volume. Filling point / Drain down point Bypass for heating circuit Heat emitters Table 16: Components not supplied by Dimplex but required to complete the installation. Page 33 Package 1 and 2 – Plumbing Schematic Page 34 Section 11: Technical specification of the LA MI range Component Notes Water Pump Circulates water around the heating circuit. Pressure Gauge Gives the pressure of the water in the heating circuit. Flow Switch Checks the water flow in the heating circuit for efficient and safe operation. Pressure relief valve A safety device that relieves the pressure in the heating circuit if it exceeds 3 bar. Inline flow boiler Additional heating capacity for Bivalent operation. OLP (Over load protection) A safety device to prevent the inline flow boiler from overheating the heating circuit. Sledge Two metal rails increase the structural integrity of the heat pump Figure 28: Components of the LA 12 and 16 MI Page 36 Approvals 1 MCS certificate number 2 MCM identifier (SAP Appendix Q) LA 6 MI LA 9 MI LA 12 MI LA 16 MI HP0017/24 HP0017/25 HP0012/20 HP0012/21 LA 6 MI LA 9 MI LA 12 MI LA 16 MI Performance Data 1 Type and order code 2 Design LA 6 MI 2.1 Degree of protection according to EN 60 529 for a compact unit or heating element 2.2 Installation location 3 Performance Data 3.1 Operating temperature limits: 3.2 LA 9 MI IP 24 IP 24 Outdoors Outdoors Heating water flow / return flow °C Max. 55 / min. 25 Max. 55 / min. 25 Air °C -20 to+35 -20 to+35 K 5 5 kW / --- 6 / 4.4 9 / 3.9 kW / --- 5.5 / 3.5 7.6 / 3.1 kW / --- 5.9 / 2.8 8.9 / 2.4 at A7 / W55 kW / --- 6 / 2.5 9 / 2.3 at A2 / W55 kW / --- 5.5/ 2.2 7.9 / 2.0 at A-7 / W55 kW / --- 5.8 / 1.8 7.6 / 1.5 at A7 / W35 kW / --- 6 / 4.4 9 / 3.9 at A2 / W35 kW / --- 6 / 3.7 9 / 3.4 at A-7 / W35 kW / --- 5.9 / 2.8 8.9 / 2.4 at A7 / W55 kW / --- 6 / 2.5 9 / 2.3 at A2 / W55 kW / --- 6 / 2.2 8.9 / 2 at A-7 / W55 kW / --- 5.8 / 1.8 7.6 / 1.5 61.5 Heating water temperature difference at A7 / W35 Heat output / COP (defrost) at A7 / W35 at A2 / W35 1 1 at A-7 / W35 Heat output / COP (peak) 1 3.3 A- weighted sound power level dB(A) 58 3.4 Sound pressure level at 1m with Q=2 to MCS 020 dB(A) 54 54 3.5 Heating water flow rate m³/h 1 1.6 3.6 Air flow m³/h 3.7 Refrigerant; total filling weight Type / kg 3.8 Lubricant; total filling quantity Type / Litre 2800 3100 R410A / 1.45 R410A / 1.45 FV50S (PVE)) / 0.9 FV50S (PVE)) / 0.9 4 Dimensions, connections and weight 4.1 Device dimensions without connections H x W x L mm 860 x 1280 x 320 860 x 1280 x 320 4.2 Device connections to heating system Inch 1 1/4" ext. thread 1 1/4" ext. thread 4.3 Weight of the transportable unit(s) incl. packaging kg 122 122 5 Electrical Connection (Heat Pump) 5.1 Nominal voltage V 230 230 5.3 Starting current A N/A (Inverter driven) N/A (Inverter driven) 5.4 Power factor MCCB 1 at A7 W35 / cos A / --- 0.95 0.95 6 Back up heater nominal power consumption kW 3.0 3.0 7 Heating Water Circuit 7.1 Expansion Vessel Litre / Bar 6/3 6/3 7.2 Pressure Relief Valve Bar Open 3.0 / Close 2.65 Open 3.0 / Close 2.65 7.3 Free pressure, heating circulating pump (max speed) kPa 56 56 8 8.1 Other design characteristics Defrosting Type of defrosting 8.2 Heating water in device protected against freezing 8.3 Controller internal / external Page 37 Automatic Automatic Reverse Cycle Reverse Cycle yes yes External External Performance Data 1 Type and order code 2 Design LA 12 MI 2.1 Degree of protection according to EN 60 529 for a compact unit or heating element 2.2 Installation location 3 3.1 3.2 LA 16 MI IP 24 IP 24 Outdoors Outdoors Performance Data Operating temperature limits: Heating water flow / return flow °C Max. 55 / min. 25 Max. 55 / min. 25 Air °C -20 to+35 -20 to+35 K 5 5 kW / --- 11.9 / 4.6 15.9 / 4.1 kW / --- 10.6 / 3.5 13.7 / 3.0 kW / --- 12.3 / 2.9 13.8 / 2.7 at A7 / W55 kW / --- 11.1 / 2.9 12.9 / 2.5 at A2 / W55 kW / --- 9.2 / 2.3 10.6 / 1.9 at A-7 / W55 kW / --- 9.93 / 1.9 9.5 / 1.7 at A7 / W35 kW / --- 12 / 4.7 16 / 4.2 at A2 / W35 kW / --- 12 / 3.9 16 / 3.5 at A-7 / W35 kW / --- 11.7 / 2.9 14.1 / 2.7 at A7 / W55 kW / --- 12 / 2.9 14.5 / 2.7 at A2 / W55 kW / --- 12 / 2.5 12.5 / 2.3 at A-7 / W55 kW / --- 10.5 / 1.9 10.5 / 1.9 64 Heating water temperature difference Heat output / COP (defrost) at A7 / W35 at A7 / W35 at A2 / W35 1 1 at A-7 / W35 Heat output / COP (peak) 1 3.3 Sound power level dB(A) 62 3.4 Sound pressure level at 1m with Q=2 to MCS 020 dB(A) 54 56 3.5 Heating water flow rate m³/h 2.1 2.8 3.6 Air flow m³/h 3.7 Refrigerant; total filling weight Type / kg 3.8 Lubricant; total filling quantity 4 4800 5400 R410A / 2.3 R410A / 2.3 Type / Litre FV50S (PVE)) / 1.2 FV50S (PVE)) / 1.2 1410 x 1280 x 320 1410 x 1280 x 320 1 1/4" ext. thread 1 1/4" ext. thread Dimensions, connections and weight 4.1 Device dimensions without connections H x W x L mm 4.2 Device connections to heating system Inch 4.3 Weight of the transportable unit(s) incl. packaging kg 165 165 V 230 230 kW 2.6 3.9 N/A (Inverter driven) N/A (Inverter driven) 5 Electrical Connection (Heat Pump) 5.1 Nominal voltage 5.2 Nominal power consumption 5.3 Starting current A 5.4 Power factor MCCB 1 at A7 W35 / cos A / --- 0.96 0.96 Back up heater nominal power consumption Heating Water Circuit kW 6.0 6.0 7.1 Expansion Vessel Litre / Bar 10 / 3 10 / 3 7.2 Pressure Relief Valve Bar Open 3.0 / Close 2.65 Open 3.0 / Close 2.65 7.3 Free pressure, heating circulating pump (max speed) kPa 83 83 6 7 8 8.1 2 A7 W35 Other design characteristics Defrosting Type of defrosting Automatic Automatic Reverse Cycle Reverse Cycle 8.2 Heating water in device protected against freezing 8.3 Controller internal / external 1) Abbreviations have the following meaning, e.g. A2 / W35: outside temperature 2°C and heating water supply temperature 35°C. A2 / W35 test, takes into account defrosting as per EN 14511. 2) According to EN 12102, EN ISO 3744. Page 38 Yes yes External External CE declaration of conformity Page 39 LA 6 MI performance Page 40 LA 6 MI (continued) Page 41 LA 9 MI performance Page 42 LA 9 MI performance (continued) Page 43 LA 12 MI performance Page 44 LA 12 MI performance (continued) Page 45 LA 16 MI performance Page 46 LA 16 MI performance (continued) Page 47 Product Dimensions LA 6 MI and LA 9 MI Page 48 Product Dimensions LA 12 MI and LA 16 MI Page 49 LA 6 MI and LA 9 MI Spare parts Note, the non-numbered parts are not kept as standard service parts. Page 50 LA 6 MI and LA 9 MI Spare parts (continued) Note, the non-numbered parts are not kept as standard service parts. Page 51 LA 6 MI and LA 9 MI Spare parts (continued) Note, the non-numbered parts are not kept as standard service parts. Page 52 LA 6 MI and LA 9 MI Spare parts (continued) Note, the non-numbered parts are not kept as standard service parts. Page 53 LA 6 MI and LA 9 MI Spare parts (continued) Note, the non-numbered parts are not kept as standard service parts. Page 54 LA 12 MI and LA 16 MI Spare parts Note, the non-numbered parts are not kept as standard service parts. Page 55 LA 12 MI and LA 16 MI Spare parts (continued) Note, the non-numbered parts are not kept as standard service parts. Page 56 LA 12 MI and LA 16 MI Spare parts (continued) Note, the non-numbered parts are not kept as standard service parts. Page 57 LA 12 MI and LA 16 MI Spare parts (continued) Note, the non-numbered parts are not kept as standard service parts. Page 58 LA 12 MI and LA 16 MI Spare parts (continued) Note, the non-numbered parts are not kept as standard service parts. Page 59 Information for DHW cylinder with buffer - ECS125HP-580 Page 60 Information for DHW cylinder with buffer - ECS150HP/75-580 Page 61 Information for DHW cylinder with buffer - ECS210HP/75-580 Page 62

Air-eau_la_mi_planning_manual_issue_2

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