Operating Instructions and Installation Instructions

Page 17
• 90-degree bends have a nominal length of 2 metres.
• 45-degree bends have a nominal length of 1 metre.
• Assembly direction is very important.
• The outlet can be made anywhere in the roof surface or exterior wall (inlet and discharge in iden-
tical pressure areas), but must comply with the regulatio ns currently in force.
The concentric duct system consists of the following components: ( see page 25 )
A. Concentric pipe. 25-50-100 cm J. Adjustable roof plate
B. Concentric 45° bend. K. Flat roof flashing aluminium
C. Wall bracket. L. Storm collar / rosette
E. Concentric 90° bend. M. Horizontal terminal eccentric
F. Wall band adjustable. N. Lead slope roof flashing 20°- 45°
G. Adjustable length = 250 mm O. Vertical terminal
H. Wall cover plate. P. Slope roof flashing 5°- 30°
I. Locking band
Connection to concentric duct system
Note:
In combination with London surround;
Direct wall outlet - start with 1x 90° bend
Vertical outlet - start with 2x 45° bend
Direct external wall duct plus use 90° bend (see illustration 7, page 24).
Decide on the position of the appliance and connect up the wall duct set. The wall duct set will have to
be shortened if the appliance is being installed directly against the wall (cavity wall for example).
(Y=0.725 metres max.)
Exterior wall duct without bends (see illustration 8, page 24)
Always place a length of X=1 metre vertically on the appliance, directly followed by a 90-degree bend
and the standard length exterior wall duct set, Y=0.6 metres.
Exterior wall duct with horizontal bend (see illustration 9, page 24).
Always place a length of X=1 metre vertically on the appliance and the course can be continued with
one 90-degree bend (nominal length per bend is 2 metres). A maximum horizontal deviation of Y=4
metres can then be made. Ensure there is adequate slope and take the horizontal length of the bend
itself into account.
Note: In some situations the flue pipe should possible be placed close to the wall. Thus the 90° bend
can not make the shortest radius; to overcome this the hole in the wall for the 90° bend can be made
lightly oval shaped.
Roof duct without bends (see illustration 10, page 24).
A direct course without bends is possible to a maximum length of X=12 metres, measured from the
connection to the appliance. The minimum length is 3 metres. The outlet can be positioned anywhere
in the roof surface, whether flat or sloping; flue gas outlet and combustion air inlet are in the same
pressure area. Until 6 metres baffle - L - should be used (see page 13 ill.1 L) From 6 metres till 12 me-
tres baffle - M - and - L - should be used (see page 13 ill. 1 M -L