Dru Metro 200XT, Installation Manual

English

I N STA LLAT IO N M AN UAL

 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.

5.8.3 Placing the concentric system

!Caution

•

Maintain a distance of at least 50 mm between the outside of the concentric system and the walls and/or the 
ceiling (see section 5.4). If the system is built in (for instance) a cove, it should be made with non combustible, 
heat-resistant material all around it.

•

Use heat-resistant insulation material when passing through combustible material.

•

Create a terminal for the concentric system with the following diameters:
- The pipe di25 mm for a passage through non combustible material (see Appendix 3, fig. 40).
- The pipe di200 mm for a passage through combustible material. Insulate the surrounding free 
space with at least 60 mm mineral wool (see Appendix 3, fig. 41).

•

The rosette of the wall terminal is too small to seal the opening in case of passage through combustible 
material. That is why a heat-resistant intermediate plate of sufficient size should first be mounted to the wall. 
Then, the rosette is mounted on the intermediate sheet.

 
The roof terminal can end in a sloping and a flat roof.
The roof terminal can be supplied with an adhesive plate for a flat roof or with a universally adjustable tile for a 
sloping roof.
 

!Caution

Some heat-resistant insulation materials contain volatile components that will spread an unpleasant smell for a 
prolonged time; these are not suitable.
 
Place the concentric system as follows:

Ø

Build the system up from (the flue spigot of) the appliance.

Ø

Connect the concentric pipe pieces and, if necessary, the bend(s).

Ø

On each connection, apply a clip binding with silicon sealing ring.

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