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6.5.3.2 Installing the concentric system
The roof duct can be used for either a sloping roof or a flat roof.
The roof duct can be supplied with an adhesive plate for a flat roof or with a universally adjustable tile for a sloping roof.
Install the concentric system as follows:
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Construct the system from the (connection stub of the) appliance up
N.B. - Allow a minimum distance of 50 mm between the outside of the concentric system and the walls and/or ceiling;
- Use heat-resistant insulating material for ducts made of combustible material.
!N.B. Some heat-resistant isolation materials contain volatile components that will spread an unpleasant smell for a pro-
longed time; these are not suitable.
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Connect the concentric pipe sections and any necessary bends;
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Fit a clamping strip and silicone sealing ring to every connection;
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Secure the clamping strip with a self-tapping screw in places which will be inaccessible after installation;
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Use enough brackets to ensure that the weight of the pipes does not rest on the appliance;
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Determine the remaining length of the roof duct;
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Cut the roof duct to size.
!N.B. Be sure to maintain the correct insertion length.
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Connect the roof duct to the concentric pipes.
!N.B. - Make sure the universal roof tile ts well against the surrounding tiles;
- Make sure the adhesive ashing sticks to the at roof properly.
6.5.4 Connection to an existing flue
The appliance can also be connected to an existing flue.
A flexible SS pipe is placed in the chimney for discharging flue gases. The surrounding space is used to supply the
combustion air.
The following requirements apply for connection to an existing flue:
- allowed only if the special DRU chimney connection set is used;
- Installation instructions supplied;
- minimum dimensions 150 x 150 mm;
- maximum vertical length 12 metres;
- maximum horizontal length 3 metres;
- the existing flue must be clean;
- the existing flue must not have any cracks or leaks.
6.6 Building the chimney breast
The appliance is designed to be installed snugly into a newly built chimney breast.
There must be sufficient space around the appliance to ensure a good heat distribution.
The chimney breast should be ventilated by vents.
N.B. - Use incombustible and heat-resistant material to construct the chimney breast, including rear wall of the chimney breast;
- The total free vent area of the vents, installed as high as possible, should be at least 200 cm2.
!N.B. When building the chimney breast, the following points should be taken into account (see Fig. 2):
- position of the control box: this should be placed within 650 mm to the left or right of the appliance, as low as possible;
- size of the control box; see section 8.2 Installing the control box;
- position of the vents;
- the size of the glass window so that it can be tted/removed once the chimney breast has been built;
- protecting the gas control block and hoses from cement and plaster.
!Tip The vents should preferably be created in both sides of the chimney breast: you could use DRU ventilation elements.
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Check that the concentric system has been installed correctly;
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Check that the clamping strips have been secured with self-tapping screws in places which will be inaccessible later;
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Allow sucient clearance round the appliance in the chimney breast to enable the heat to disperse:
- minimum internal height: 1710 mm;
- minimum internal width: 1610 mm.
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Do not plaster over the anges because:
- the heat from the appliance could cause cracks;
- it will then be impossible to remove/t the glass window.
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If the chimney breast is made of stone-like materials or has been nished in stucco, it should be left to dry for at least
6 weeks prior to taking it into operation, in order to prevent cracks.
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