Condensate Pipe Work; Internal Connections - Bosch ZSB 30-2 Installation And Servicing Instructions

22 | Pre-Installation
5.2

Condensate pipe work

NOTE:
B Where a new or replacement boiler is
being installed and freezing conditions
are possible, access to an internal drain
"gravity discharge" point should be one
of the factors considered in determining
boiler location.
B The condensate pipe must be a minimum
of 40 mm Ø plastic pipe.
B The condensate pipe work must fall at
least 50 mm per metre towards the outlet
and should take the shortest practicable
route.
B Ensure that there are no blockages in the
pipe run.
Key to condensate illustrations
1 Condensate discharge
2 Air gap (20mm)
3 Tundish
4 Self sealing device
5 Dishwasher connection
6 Vent stack
Table 8
5.2.1

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.
6 720 644 143 (2010/09)
1
2
20mm
3
4
40mm Ø
Fig. 11 Disposal to soil vent stack - vertical position
1
2
20mm
3
4
40mm Ø
Fig. 12 Disposal to soil vent stack - on gradient
6
6720646195-18.1Wo
6
40mm Ø
6720646195-19.1Wo