Pressure Relief Pipework; Boiler Locations And Clearances - Bosch WORCESTER Greenstar Danesmoor 18/25 Installation, Commissioning And Servicing Instruction Manual

4.6

Pressure relief pipework

• The pressure relief discharge pipe (1) should be at least 15mm
diameter copper pipe and run downwards away from the boiler and
discharge away from any electrical or other hazard, preferably to an
external drain or soak away.
• Pipe (3) should be finished with a partial bend, near the outlet to face
the external wall (as shown) to help prevent freezing.
1
2
3
4
Fig. 22 Pressure relief pipe work
[2] Outside wall
[1, 3] PRV discharge pipe
[4] External drain
4.7

Boiler locations and clearances

This boiler is only suitable for installing internally within a property at a
suitable location onto a fixed rigid surface of the same size as the boiler
and capable of supporting the boiler weight.
The boiler must be installed on a flat level surface to ensure condensate
does not enter the primary heat exchanger.
The boiler is not suitable for external installation unless a suitable
enclosure is provided.
Roof space installations must fully conform to BS 5410 part 1 section
4.6.9.
Open flue model (CF)
In order to ensure clean and efficient combustion an adequate supply of
air must be delivered to the combustion chamber.
To provide sufficient air a suitable inlet must be provided into the room
or space in which the boiler is situated.
Output 12/18
2
Size cm 99
An air brick or other form of continuous air supply may have to be built
into the installation in order to ensure an adequate supply of air.
If the appliance is to be installed in a confined space or compartment two
air vents are required, one at high level and one at low level.
The minimum free area of each vent is shown opposite and depends
whether the air is taken from another room or from outside the building.
Where the air is taken from another room that room must contain an air
inlet as described above.
Greenstar Danesmoor Kitchen ErP+ and Kitchen System
1
2
2
3
4
6720646608-123.1Wo
18/25 25/32
138 165
ErP+ - 6 720 821 686 (2018/04)
Room sealed balanced flue models (RS)
The appliance does not require a separate vent for combustion air.
Installation in cupboards or compartments require permanent vents for
cooling purposes, one at high level and one at low level, either direct to
outside air or to a room.
Both vents must pass to the same room or be on the same wall to the
outside air.
The minimum air vent free area is given in the table opposite.
Installation clearances
Figure 23 shows the minimum space recommended to install the boiler
only.
0 m m
1 2 0
m m
6 0 0
1 0 0
m m
5 7 0
m m
Fig. 23 Installation clearances
Service clearances
Figure 24shows the minimum space required to carry out an annual
service.
* Remove the flue 'knock-out' panel sections if this clearance is less than
75mm.
The appliance is suitable for an under worktop installation providing that
the worktop above the boiler (min 10mm clearance) is removable for
maintenance and repair and the front of the boiler is not enclosed.
** Due to changes to BS 5410 and modern building design, these figures
no longer incorporate the adventitious ventilation allowance.
0 m m
1 2 0
m m
6 0 0
5 m m
*
3 8 0
m m
Fig. 24 Service clearances
Pre-Installation
3 0 0
m m
1 0 0
m m
1 0 m
m
5 m m
*
19