VIESMANN Installation instructions for contractors Vitodens 300 Type WB3A, 49 and 66 kW Wall mounted gas fired condensing boiler Natural gas and LPG version VITODENS 300 Dispose after installation. 5862 570 GB 10/2006...
Safety instructions Please follow these safety instructions closely to prevent accidents and material losses. Safety instructions explained Regulations Danger Observe the following when working This symbol warns against the on this system risk of injury. & all legal instructions regarding the prevention of accidents, Please note &...
Index Preparing for installation Product information ..................Preparing for installation ................& Preparing the boiler installation ..............Installation sequence Installing the boiler and making all connections ........... & Wall mounting bracket installation ............& Hanging the boiler into the wall mounting bracket ........Heating water (primary) connection.............
Conversion for other target countries The Vitodens 300 should generally only be delivered to those countries speci- fied on the type plate. For deliveries to alternative countries, an approved con- tractor must arrange, on his own initiative, for an individual approval in...
Preparing for installation Preparing the boiler installation A Heating flow G 1½" F Heating return G 1½" B Safety valve G Expansion vessel G 1" C Cylinder flow G 1½" H Cable entry D Gas connection K Recommended dimension E Cylinder return G 1½" L Condensate drain...
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Preparing for installation (cont.) Note 2. Prepare the gas connection This boiler (protection level: IP X4 D) according to TRGI or TRF [or local is approved for installation in wet regulations]. rooms inside protection area 1 according to DIN VDE 0100, providing 3.
Installing the boiler and making all connections Wall mounting bracket installation Note The enclosed screws and rawl plugs are only suitable for concrete. For other construction materials, use fix- ings that are suitable for 110 kg loads. A Reference point: boiler top edge C Top edge finished floor B Installation template (included D Recommendation...
Heating water (primary) connection Connect the boiler to the on-site pipe- work. A Heating flow B DHW flow C Gas connection D DHW return E Heating return F Expansion vessel Flue connection Connect the balanced flue pipe. Flue gas system installation instructions.
Gas connection 1. Carry out a gas soundness test. Please note Excessive test pressure may damage the boiler and the gas valve. Max. test pressure 150 mbar. Where higher pres- sure is required for leak tests, separate the boiler and the gas valves from the A Gas connection gas supply pipe (undo the fitting).
Electrical connections Information regarding the connection of accessories For details of accessories, also observe their separate installation instructions. Please note Electronic modules can be damaged by electro-static discharges. Touch earthed objects, such as heating or water pipes, to discharge sta- tic loads.
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Electrical connections (cont.) C Vitotrol 100 UTD (only for con- stant temperature control units) Remove jumper when making this connection. D Vitotrol 100 UTA (only for constant temperature control units) Remove jumper when making this connection. 230 V~ plugs Low voltage plugs sÖ...
Electrical connections (cont.) Routing connecting cables Please note Connecting cables will be damaged if they contact hot parts. When routing and securing connecting cables on site, ensure that the maximum permissible temperatures for these cables are not exceeded. A Low voltage connections F Cable grommet for power supply B 230 V connections cable...
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