20
Installation and maintenance instructions ecoTEC exclusive 0020193968_05
drain pipe freezing. Fitting an extra trap may cause the boiler
siphon to work incorrectly.
▶
Follow the instructions listed here and observe directives
and local regulations on condensed water discharge.
▶
If you cannot guarantee that the materials from which the
condensate discharge pipe is made are suitable, install a
system to neutralise the condensate.
▶
Fit the condensate discharge
(2)
.
▶
Connect the condensate discharge
(2)
to a condensate
discharge pipe
(3)
that has a minimum internal diameter
of 19 mm (30 mm internal diameter for all externally in-
stalled pipes) and is made from an acid-resistant material
(e.g. plastic overflow pipe).
–
The condensate discharge pipework must have
a continuous fall (45 mm per metre) and should
whenever possible terminate at a suitable discharge
point within the heated envelope of the building
that will remain frost free under long periods of low
external temperatures.
Note
Ensure that the connection between the con-
densate discharge pipe and the drain hose is
not air-tight.
▶
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.
▶
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 the following installation space beneath the con-
densate trap:
Condition
: VUW 356/5
‑
7 (H-GB) ecoTEC exclusive
–
A = at least 180 mm
Condition
: VUW 436/5
‑
7 (H-GB) ecoTEC exclusive
–
A = at least 340 mm
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
Ø22mm
Preferred option
7.8.1.2 Direct connection to external soil and vent
stack
Ø22mm
Ø 32mm
≤ 3 m
7.8.1.3 External termination to gulley or hopper
Ø22mm
Ø 32mm
≤ 3 m
Best practice
7.8.1.4 Internal termination into combined sink
waste
Ø32mm
Ø22mm
≥ 3 m
100mm
