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They are not intended to describe complete systems, nor any particular system. It is the responsibility of the system designer, not Grant Engineering UK Ltd., to determine the necessary components for and configuration of the particular system being designed including any additional equipment and safety devices to ensure compliance with building and safety code requirements. 4 Hydraulic Diagrams IMPORTANT The following are examples of suitable systems Hydraulic Figure 4-2: Monovalent system - with extended S-Plan type controls 4 Hydraulic Diagrams 10 Hydraulic Diagrams 4.3 S-Plan Type - Bivalent CH Flow DHW Flow Heating Load DHW Return CH Return Room Stat Internal wiring centre Programmer Boiler 200mm minimum R F Cylinder Stat The following are examples of suitable systems Figure 4-4: Bivalent system - with boiler manifold and S-Plan type controls Outside wall Auto Bypass Boiler manifold Flow Flexible pipe Isolating valve Isolating valve Return Grant Aerona Heat Pump Primary PumpCondenser Heat Pump ATC IMPORTANT The following system diagrams are only concept drawings and not detailed engineering drawings. They are not intended to describe complete systems, nor any particular system. It is the responsibility of the system designer, not Grant Engineering UK Ltd., to determine the necessary components for and configuration of the particular system being designed including any additional equipment and safety devices to ensure compliance with building and safety code requirements. Hydraulic 11 200mm minimum CH Flow DHW Flow Outside wall 4.4 Extended S-Plan Type - Bivalent Heating Load Heating Load DHW Return CH Return Room Stat Room Stat Internal wiring centre Programmer Boiler R F Cylinder Stat Figure 4-6: Bivalent system - with boiler manifold and extended S-Plan type controls Auto Bypass Flow Flexible pipe Isolating valve Isolating valve Return Grant Aerona Heat Pump Primary PumpCondenser Heat Pump ATC Boiler manifold 4 Hydraulic Diagrams 12 Hydraulic Diagrams 4.5 Buffers Tanks 4.6 S-Plan with Buffer - Monovalent The use of a buffer with the current Aerona heat pump is not necessary in the majority of installations. However, it is possible to utilise a buffer if the end-user wishes to store hot water when there is no other demand placed on the system. There are two main considerations when deciding when and where a buffer tank should be used. 1. It may act as an initial boost when a heating demand is placed on the system from cold. 2. Storing water for this function will result in heat losses from the buffer over time, reducing the overall COP and therefore the overall efficiency of the heat pump and the system. When considering the use of a buffer, also consider the space the buffer will take up – it may not be possible to house both a cylinder and a buffer tank. The following diagrams show both an S-plan and an extended S-Plan for use with a buffer tank. CH Flow DHW Flow Cylinder Stat Room Stat Internal wiring centre Heating Load Programmer Flow Flexible pipe Buffer tank Isolating valve Isolating valve Return Grant Aerona Heat Pump Primary PumpCondenser Heat Pump ATC Figure 4-7: Monovalent system - with Buffer and S-Plan type controls CH ReturnDHW Return Outside wall IMPORTANT The following system diagrams are only concept drawings and not detailed engineering drawings. They are not intended to describe complete systems, nor any particular system. It is the responsibility of the system designer, not Grant Engineering UK Ltd., to determine the necessary components for and configuration of the particular system being designed including any additional equipment and safety devices to ensure compliance with building and safety code requirements. Hydraulic 13 4.7 Extended S-Plan with Buffer - Monovalent Cylinder Stat Room Stat Room Stat Internal wiring centre Heating Load Programmer The hydraulic diagrams do not show the isolation valves, any expansion vessels, pressure relief valves or filling loops. More information on these components can be found in section 7. ! NOTE Figure 4-8: Monovalent system - with Buffer and extended S-Plan type controls CH Flow DHW Flow Flow Flexible pipe Buffer tank Isolating valve Isolating valve Return Grant Aerona Heat Pump Primary PumpCondenser Heat Pump ATC CH ReturnDHW Return Outside wall System DesignCriteria Unlike a typical condensing oil or gas fired boiler that operates at a flow of 70°C and a return of 50°C, a heat pump operates with a flow of between 30°C and 60°C. The return temperature will depend on the load of the system at a given point in time. The design of any system in the UK is typically based on 2 parameters. 1. That the outside air temperature can fall to as low as -3°C and that the house comfort temperature will be 21°C. The BTC incorporated in the heat pump will adjust the output according to the external ambient air temperature but the system must be designed in the first place to meet this maximum demand. 2. The second factor to consider is achieving this ...

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