Vaillant ecoTEC plus VU 446/5-5 (H-GB) Installation And Maintenance Instructions Manual page 26

▶
Connect the condensate siphon (1). Use the supplied
condensate discharge hose (2) to do this.
▶
Connect a condensate discharge pipe (21.5 mm, not in-
cluded in the scope of delivery) to the condensate dis-
charge hose (2).
▶
During installation remove all burs from inside of cut pipe
work and avoid excessive adhesive which may trap small
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.
You can find further information in specification "BS 6798"
for installing and maintaining gas-fired boilers with a nominal
heat input below 70 kW.
7.9.1 Overview of the condensate discharge
systems
Validity: Great Britain OR Ireland
7.9.1.1 Direct Connection to internal soil and vent
stack
Preferred option
7.9.1.2 Direct connection to external soil and vent
stack
≤ 3 m
26
Ø22mm
Ø22mm
Ø 32mm
7.9.1.3 External termination to gulley or hopper
≤ 3 m
Best practice
7.9.1.4 Internal termination into combined sink
waste
≥ 3 m
Preferred option for external termination
7.9.1.5 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
Installation and maintenance instructions ecoTEC plus 0020261389_03
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