Vaillant ecoTEC plus Installation And Maintenance Instructions Manual page 21

pockets of water close to the pipe wall which can freeze
and build into a larger ice plug.
▶
As with other pipe work insulate the condensate dis-
charge pipe to minimise any risk of freezing and beware
when crossing cavities that the fall is maintained and the
pipe sleeved.
▶
Ensure that the condensate discharge pipe terminates in
a suitable location. Further information can be obtained
from BS 6798 Specification for installation of gas–fired
boilers of rated input not exceeding 70 kW net.
▶
Leave an installation space of at least 180 mm beneath
the condensate trap.
7.8.1 Condensate discharge systems
The condensate is discharged periodically in 'slugs' by si-
phonic action. It is not necessary to provide extra traps in the
discharge pipe as there is already a trap inside the boiler.
Fitting an extra trap may cause the boiler siphon to work in-
correctly. Refer to BS5546 or BS6798 for further advice on
disposal of boiler condensate.
7.8.1.1 Direct Connection to internal soil and vent
stack
Preferred option
7.8.1.2 Direct connection to external soil and vent
stack
≤ 3 m
0020244998_04 ecoTEC plus Installation and maintenance instructions
Ø22mm
Ø22mm
Ø 32mm
7.8.1.3 External termination to gulley or hopper
≤ 3 m
Best practice
7.8.1.4 Internal termination into combined sink
waste
≥ 3 m
Preferred option for external termination
7.8.1.5 External termination into soakaway
Ø32mm
≤ 3 m
< 500 mm
1 Ground (either/or)
2 Seal
3 Plastic tube,
100 mm diameter
Least preferred option, must not terminate in rain water drain
Ø22mm
Ø 32mm
100mm
Ø22mm
Ø32mm
1
100 mm
2
3
4
5
6
4 Bottom of sealed tube
5 Limestone chippings
6 Hole depth 400 mm
minimum
Ø12
25
21