Condensate Pipe Work; Internal Connections - Bosch Condens 5000W Installation And Maintenance Instructions Manual

Optional internal diverter valve (not supplied with boiler)
This boiler is designed to operate on a sealed system only. The boiler will
require a second return pipe from the water cylinder to the wall mounting
frame.
Boiler flow
Cylinder return
Heating return
Fig. 9 Optional internal diverter valve
Key to figure 9:
[2] Radiator valve (flow)
[3] Lock shield valve (return)
3.4

Condensate pipe work

NOTE:
▶ Where a new or replacement boiler is being installed and freezing
conditions are possible, access to an internal "gravity discharge"
point should be one of the factors considered in determining boiler
location.
▶ The condensate pipe must be a minimum of 40 mm Ø plastic pipe.
▶ The condensate pipe work must fall at least 50 mm per metre towards
the outlet and should take the shortest practicable route.
▶ Ensure that there are no blockages in the pipe run.
3.4.1

Internal connections

Where there is the possibility of freezing conditions and In order to
minimise the freezing risk during prolonged cold spells, the following
methods of installing condensate drainage pipe should be adopted, in
order of priority.
Wherever possible, the condensate drainage pipe should be routed and
terminated so that the condensate drains away from the boiler under
gravity to a suitable internal soil and vent stack. A suitable permanent
connection to the foul waste pipe should be used.
A self sealing device should be incorporated in the drainage path, if
possible, in an upright position. A tundish should be used as a suitable
air gap just before the self sealing device. The self sealing device can be
used on a gradient as long as it preceded by a vertically mounted tundish.
Bosch Condens 5000W – 6 720 646 195 (2018/10)
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2
6720644743-07.1Wo
Soil vent stack disposal
Disposal - vertical position
1
2
20mm
3
4
40mm Ø
Fig. 10 Disposal to soil vent stack - vertical position
Key to figure 10:
[1] Condensate discharge
[2] Air gap (20mm)
[3] Tundish
[4] Self sealing device
[6] Vent stack
Disposal - gradient position
1
2
20mm
3
4
40mm Ø
Fig. 11 Disposal to soil vent stack - on gradient
Key to figure 11:
[1] Condensate discharge
[2] Air gap (20mm)
[3] Tundish
[4] Self sealing device
[6] Vent stack
Pre-Installation
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6
40mm Ø
6720646195-19.1Wo
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