Technical data

1110
Wall preparation
The picture shows the Si wall
mounting jig which enables a
simple and straightforward method
of attaching the boiler to the wall
surface.
After fixing the jig to the wall, the
appliance, having a lift weight
of less than 28kg, can be easily
lifted by one man onto the jig
and the union connections
tightened. The pipework can be
routed behind the boiler without the
need for an additional wall spacing
frame.
Condensate disposal
All condensing boilers generate condensate discharge which needs
to be piped away from the appliance in via a plastic pipe.
The amount of condensate generated depends on the efficiency
and operating status of the appliance. The boilers will generally only
produce condensate whilst operating in central heating mode. Some
models will condense in both heating and hot water modes and can
generate up to 2 litres of condensate water an hour.
Condensate termination and route
The condensate connection on the Worcester Bosch appliances is in
22mm plastic. The pipe should be extended and run away from the
appliance with a constant fall of 2.5 degrees or 50mm in every metre.
The condensate pipe can terminate into any one of five areas:
Internal sink/washing machine drain
75mm min.
A
B
C
D
F
A - Condensate from boiler
B - Sink
C - 22mmØ plastic condensate pipe
D - Gulley
E - Internal soil and vent stack
F - Waste trap (75mm min)
G - 300mm x 100mmØ sealed plastic
tube
H - Ground level
J - Drainage holes 50mm from base
of tube (12mmØ at 25mm
centres) facing away from building
K - Limestone chippings
External drainage system
Soil/vent stack
D
A
C
Invert
450 min.
E
A
C
75mm
min.
F
A
B
C
D
Whilst all of the above
methods are acceptable it is
always the best practice to
terminate the condense pipe
via an internal waste system.
This will eliminate the need
for any external condensate
pipe runs which can be
susceptible to freezing in
extreme weather.
External condensate pipework
All Worcester Bosch condensing boilers have within a syphonic
condensate trap. Rather than the condensate constantly dripping into
the discharge pipe, the condensate is collected into a trap which
releases it in 100ml quantities. This will help prevent freezing occurring.
If there is no alternative and the condensate pipe has to be
externally run, the following should be considered:
●
The pipe run should take the shortest practical route.
●
The pipework should be insulated with weather resistant insulation.
●
The pipe should terminate as close as possible to the ground or
drain, whilst still allowing the condensate to safely disperse. This
would prevent wind blowing up the pipe.
●
The pipework should be installed with the minimum of horizontal
runs and with a downward slope of at least 2.5 degrees.
25mm
min.
400mm
min.
A
G
K
J
H
C
500mm mi
n.
Flue terminal positioning
General position
1. The terminal must not cause an obstruction nor the discharge a
nuisance. Particular care should be exercised with regards to the
pluming of the flue gases and any increase in noise levels.
2. If a terminal is fitted less than 2 metres above a surface to
which people have access, then a guard must be fitted.
A terminal protective guard is available from Tower Flue
Components, Vale Rise, Tonbridge. Tel No. [phone].
The terminal guard must be securely fixed to the wall using
suitable plugs and corrosion resistance screws. The guard must
be symmetrically positioned about the terminal assembly and
The flue system must be installed and terminated in accordance with
the recommendations of BS 5440:Part 1.
RSF horizontal and vertical
Q
Q
I
I
F
B
D,E
C
H
H
N
M
K
A
G
L
H
Boundary
J
P
Q
Key to illustration
Terminal Position Min Distance
A
1
Directly below an opening, air brick, opening windows etc. 300mm
B
1
Above an opening, air brick, opening window etc. 300mm
C
1
Horizontally to an opening, air brick, opening window etc. 300mm
DBelow gutters, soil pipes or drain pipes 75mm
EBelow eaves 200mm
F Below balconies or car port roof (lowest point) 200mm
GFrom a vertical drain pipe or soil pipe 150mm
HFrom an internal or external corner 300mm
I Above ground, roof or balcony 300mm
J From a surface facing the terminal 600mm
K From a surface facing the terminal 1200mm
L From an opening in the car port not
(e.g. door, window) into the dwelling recommended
MVertically from a terminal on the same wall 1,500mm
N Horizontally from a terminal on the same wall 300mm
P From a vertical structure on the roof *
Q Above intersection with roof *
1
In addition, the terminal should not be nearer than 150 mm (fanned draught) to an opening in the
building fabric formed for the purpose of accommodating a built-in element such as a window frame.
* See instructions supplied with vertical flue kits
spaced such that there is a gap of 50mm between the end of the
terminal and the guard.
3. In certain weather conditions, a white plume of condensation will
be emitted from the flue terminal and siting where this could be a
nuisance, i.e. near security lighting, should be avoided.
4. The air inlet/outlet duct and the terminal of the boiler must not be
closer than 25mm to any combustible material. Detailed
recommendations on protection of combustible materials are given
in BS 5440:1.
Internal waste drainage system
External condensate absorption point
Cabinet dimensions
A700mm*
B400mm
C330mm
A
B
C
*710mm to top of casing front.
Pipework connections
ACH Flow 22mm
BCH Return 22mm
C Gas Inlet 22mm
DMains Water Inlet 15mm
E DHW Outlet 15mm
A
E
C
D
B
Pipework connections and casing dimensions