Worcester GB162-100

INSTALLATION
6 720 648 726 (2011/07)
28
8.3.3 MAXIMUM FLUE LENGTH (L)
The maximum pipe length (L) of the air supply and flue
gas exhaust pipes for the condensing gas system boilers
is determined by the total pressure loss of all
components in the flue system.
Maximum length of horizontal or vertical extensions for
100/150 flue system (Æ fig. 30 and fig. 31). For flue
length see table 6.
Fig. 30 Vertical flue length
Fig. 31 Horizontal flue length
A Distance from centre of flue to inside rear wall
B Distance from centre wall bracket to centre of flue elbow
L Distance from centre of flue to outside wall
Take the flue pipe clearances into account when
planning the layout of the place of installation
(Æ subsection 8.3.1: "Siting the flue terminal" on
page 26).
Maximum wall thickness without extensions is 415 mm.
Maintain a minimum side clearance of 8 mm (Æ fig. 28).
8.3.4 ADDITIONAL FLUE PARTS
The additional flue parts listed can be ordered from your
supplier.
FLUE SIZE 100/150 AND 80/125
WEATHERING SLATES FOR 100/150 AND 80/125
Flat roof, pitched roof.
8.3.5 STANDARD 100 MM FLUE SYSTEMS
The standard concentric flue system provides for a max.
horizontal straight length (Æ table 6, subsection 8.3.4).
Full instructions for fitting this flue are in
subsection 8.3.6: "Installation of the horizontal flue" on
page 29.
L
6 720 648 726-030.1TD
A
L
B
6 720 648 726-031.1TD
GB162 Maximum flue length [m]
concentric flue system
100/150 80/125
65 20 7.7
80 18 –
100 18 –
Table 6 Max. flue lengths, incl. wall/roofterminal in
meters
GB162 Reduced flue length [m]
1)
1) For every bend or extension the max. flue length (L) has to
be reduced
concentric flue
system 100/150
concentric flue
system 80/125
bend extension bend extension
45° 90° 0.5m 1m 45° 90° 0.5m 1m
65 1.2 2.1 0.5 1.0 0.9 1.9 0.5 1.0
80 1.2 2.1 0.5 1.0 0.9 1.9 0.5 1.0
100 1.2 2.1 0.5 1.0 0.9 1.9 0.5 1.0
Table 7 Reduced flue lengths in meters
The total reduction length must never
exceed the maximum flue length.
IMPORTANT: Any horizontal flue system
fitted to a condensing boiler must be
inclined towards the appliance at an angle
of 52 mm per metre length to prevent
condensate dripping from the flue terminal.
This means that the clearance above the
appliance must be increased to match the
duct length. See fig. 6 on page 17.