Bosch Worcester GB162-100 V2, Installation, Commissioning And Servicing Instructions, Page: 18 / 52

Pre-Installation
6720814332 (2018/04) 18
Weathering slates for 80/125 and 100/150
Flat roof, pitched roof.
3.8.4 Standard 100 mm flue systems
The standard concentric flue system provides for a max. horizontal
straight length (

table 11, subsection 3.8.3). Full instructions for
fitting this flue are in subsection 3.8.5: “Installation of the horizontal
flue” on page 18.
3.8.5 Installation of the horizontal flue
The standard flue is suitable for lengths up to 660 mm (

fig. 27).
For longer flue runs up to 20.0 m for the 100/150 flue system and 7.7 m
for the 80/125 flue system, flue extensions are available.
Fig. 27 Installation with horizontal flue kit
[1] maximum length
[2] terminal assembly
[3] 90° flue turret
[4] finishing kit
[5] outer wall
3.8.6 Flue pipe preparation and assembly
▶ Measure the flue length L. Refer to figures 28 and 29.
Fig. 28 Flue length - rear
[A] 152 mm
[B] 337.5 mm for Ø 80/125 mm horizontal flue
[] 339.5 mm for Ø 100/150 mm horizontal flue
[L] flue length
Fig. 29 Flue length - side
▶ For connection into the elbow, a minimum length of pipe must be
maintained.
The flue gas pipe (inner pipe) and air intake pipe (outer pipe) must
maintain different lengths:
Air intake = L minus 50mm
Flue gas = L minus 70mm
Mark off the lengths and cut to length. The cuts must be square and
free from burrs.
▶ Assemble flue system completely. Push the flue fully together.
The slope of the terminal outlet [2] must face downwards.
The assembly will be made easier if a solvent free grease is lightly
applied to the male end of the flue.
Fig. 30 Flue terminal position
Model Reduced flue length [m]
1)
1) For every bend or extension the max. flue length (L) has to be reduced by the
corresponding length in m.
concentric flue system
100/150 mm
concentric flue system
80/125 mm
bend extension bend extension
45° 90° 0.5m 1m 45° 90° 0.5m 1m
50-V2 1.2 2.1 0.5 1.0 0.9 1.9 0.5 1.0
65-V2 1.2 2.1 0.5 1.0 0.9 1.9 0.5 1.0
85-V2 1.2 2.1 0.5 1.0 – – – –
100-V2 1.2 2.1 0.5 1.0 – – – –
Table 12 Reduced flue lengths in metres
The total reduction length must never exceed the
maximum flue length.
Important : Any horizontal flue system fitted to a
condensing boiler must be declined towards the
appliance at an angle of 53 mm per metre length to
prevent condensate dripping from the flue terminal.
This means that the clearance above the appliance must
factor in the horizontal flue run length. See fig. 21 on
page 16.
6 720 648 726-032.1TD
5
4
3
2
1
The flue must be inclined from the boiler.
A
L
B
6 720 648 726-031.1TD
L
6 720 648 726-034.1TD
6 720 648 726-035.1TD
4
3
2
1