Bedienungsanleitung DRU Lugo 80 (Seite 10 von 44) (Englisch)

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INSTALLATION MANUAL

5.8 Concentric system

5.8.1 General

The appliance is connected to a flue gas discharge / combustion air supply system delivered by DRU, hereafter

referred to as the concentric system. The diameter for this connection is indicated in appendix 2, table 2. The

passage to the outside can be created with a wall terminal (C11) or a roof terminal (C31). If necessary, an existing

chimney can be used (see section 5.8.4).

!Caution

• Only use the concentric system supplied by DRU. This system has been tested in combination with the

appliance. DRU cannot guarantee a proper and safe operation of other systems and does not accept any

responsibility or liability for this.

• Use a chimney set for the connection to the chimney, DRU will be able to supply it.

• DRU's concentric system is intended for indoor use and may therefore not be used outdoors, with the

exception of the sections intended for that purpose such as roof and wall terminals.

The concentric system is constructed from (the flue spigot of) the appliance.

If, due to constructional circumstances, the concentric system is placed first, it is possible to connect the appliance

by means of a telescopic pipe piece.

5.8.2 Construction of the concentric system

Depending on the configuration of the concentric system, the appliance must be further adjusted with a possible

restrictor slide and/or air inlet guide.

See Tables 4 and 6 for determining the correct adjustment and section 'Adjustment of the appliance' for the

method of working.

The concentric system with wall or roof terminal has to comply with the following conditions:

• In appendix 2, table 4 or 5 you can find whether a concentric pipe should be connected and what the

minimum vertical length would have to be.

• Determine the permissibility of the required configuration.

When using a wall terminal (C11) the following applies:

• The total vertical pipe length, when using a wall terminal, may have a maximum length that can be found in

appendix 2, table 4.

• The minimum vertical pipe length, when using a wall terminal, can be found in appendix 2, table 4.

• The total horizontal pipe length, when using a wall terminal, may have a maximum length that can be found

in appendix 2, table 4 (excluding wall terminal; see appendix 3, fig. 5).

When using a roof terminal (C31) the following applies:

• The construction of the chosen system, when using a roof terminal, must be permissible according to

Appendix 2, Table 5 (See the method of working described below).

The working method below indicates how the permissibility is determined of a concentric system when using a

roof terminal.

1) Count the number of 45° and 90° bends required (15° and 30° bends are also allowed).

2) Count the total number of whole metres of horizontal pipe length.

3) Count the total number of metres of vertical and/or sloping pipe length (roof terminal excluded).

4) In the first 2 columns of Table 5, look for the number of bends required and the total horizontal pipe length.

5) In the top row of Table 5, look for the required total vertical and/or sloping pipe length.

6) A box with a letter means that the chosen concentric system is permitted.

7) Use Table 6 to determine how the appliance should be adjusted.

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