1.2 Structure of the Planning and installation guide - Shop

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30 3 Planning the HDG Navora – Connections Raising return temperature The following equipment/specifications must be employed in order to prevent the temperature from dropping below the dew point: 3way mixer with servo drive 230 V, runtime of 120 - 240 sec. and a circulation pump. Recommendation • 20 kW nominal thermal output: Wita U55-32, 3-way mixer 1 1/4" BSP (DN 32) • 25 kW nominal thermal output: Wita U 55-32, 3-way mixer 1 1/4" BSP (DN 32) • 30 kW nominal thermal output: Wita U 55-32, 3-way mixer 1 1/4" BSP (DN 32) Pipe dimensions are to be adapted to meet site-specific requirements. For HDG Navora 20/25/30 with HDG Lambda Control 1 series boilers, the installation of a hydraulic system is compulsory as specified by HDG Bavaria GmbH. Without a hydraulic system, the proper performance of the controller cannot be guaranteed. In general, operating temperatures which are too low significantly shorten the service life of the boiler. Water vapour contained in the flue gas could be released in the form of condensation if the temperature drops below the dew point, especially in the area around the watercooled top heating surfaces. This condensation causes corrosion and reduces the service life of the boiler. The raising of the return temperature is controlled by the HDG Lambda Control 1 controller, which is included in the specification of delivery for the boiler. The hydraulic system is to be installed in accordance with specific technical principles of the heating construction industry. The hydraulic system is not prepared for the integration of a gravity brake. Accumulator The use of a accumulator When calculating the thermal requirements of buildings, e.g. to BS EN 12831 “Method for calculating the normal heating load”, the lowest outdoor temperature for the climate zone concerned (e.g. -1 ˚C) is used. This condition only applies a few days per year so that the thermal performance of the heating system is overdesigned for most of the days when heating is needed. As the boiler for this system is rated for a nominal load, the use of a accumulator is required. The size of the accumulator depends on the nominal thermal power of the boiler, the thermal requirement of the building and the fuelling chamber volume of the boiler. As a rule of thumb, the following formula can be used to make a rough calculation based on the volume of the fuelling chamber: Vbuffer=fuelling chamber volume x 12 HDG Navora 20/25/30 with HDG Lambda Control 1 - V 2 - en © HDG Bavaria GmbH 06/2008
The product should be rounded up. 3 Planning the HDG Navora – Connections Example calculation The HDG Navora 20/25/30 with HDG Lambda Control 1 has a fuelling chamber volume of 150 litres. Vbuffer = 150 litres x 13 (The factor is dependent on the fuel type. Spruce is assumed as the fuel for this example. For beech, a factor of 15 should be used in the formula.) Vbuffer = 1950 litres When rounded up, the resulting volume should be at least 2000 litres. For a more exact calculation of the accumulator volume, refer to DIN EN 303-5 “Boilers for solid fuels, manually and automatically fed firings, nominal thermal output up to 300 kW.” © HDG Bavaria GmbH 06/2008 HDG Navora 20/25/30 with HDG Lambda Control 1 - V 2 - en 31
Page 1: Planning and Installation Guide HDG
Page 4 and 5: 4 Planning and installation guide H
Page 6 and 7: 6 1 Notes on this guide - Structure
Page 8 and 9: 8 2 Safety notes - Intended use 2 S
Page 10 and 11: 10 2 Safety notes - Intended use Wo
Page 12 and 13: 12 2 Safety notes - Warnings and sa
Page 14 and 15: 14 3 Planning the HDG Navora - Sect
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Page 18 and 19: 18 3 Planning the HDG Navora - Mode
Page 20 and 21: 20 3 Planning the HDG Navora - Tech
Page 22 and 23: 22 3 Planning the HDG Navora - Fuel
Page 24 and 25: 24 3 Planning the HDG Navora - Stru
Page 26 and 27: 26 3 Planning the HDG Navora - Conn
Page 28 and 29: 28 3 Planning the HDG Navora - Conn
Page 32 and 33: 32 3 Planning the HDG Navora - Hydr
Page 40 and 41: 40 4 Installing the HDG Navora - Sp
Page 42 and 43: 42 4 Installing the HDG Navora - In
Page 56 and 57: 56 4 Installing the HDG Navora - Co
Page 58 and 59: 58 5 Appendix - Circuit diagram on
Page 60 and 61: 60 5 Appendix - Electrical connecti
Page 66: 66 5 Appendix - HDG Öku 3.1 circui

1.2 Structure of the Planning and installation guide - Shop

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