Connecting The Heating Flow And Heating Return; Connecting The Drain Pipework For The Expansion Relief Valve; Connecting The Condensate Discharge Pipe - Vaillant ecoTEC pro VUW 6/5-3 Series Installation And Maintenance Instructions Manual

2. Ensure correct water pressure and flow requirements
and that any expansion can be accommodated with the
cold supply pipe work.
7.5 Connecting the heating flow and heating
return
▶
Make the heating connections as shown in accordance
with the relevant standards.
Connecting the drain pipework for the
7.6
expansion relief valve
1. Install the drain pipe for the expansion relief valve so
that it does not interfere with the removal and fitting of
the lower section of the condensate trap.
2. Install the drain pipe as shown (do not shorten).
3. Make sure that the end of the pipe is visible.
4. Ensure that discharged water or steam cannot cause
injury to persons or damage to electronic components.
5. Ensure the discharge pipe work is installed, routed and
terminated correctly to minimise the risk of freezing up.
0020244995_04 ecoTEC pro Installation and maintenance instructions
7.7

Connecting the condensate discharge pipe

Danger!
Risk of death from escaping flue gases!
The condensate drain pipework for the si-
phon must not be connected tightly to waste-
water piping because, otherwise, the internal
condensate trap may be drained fully and flue
gas may escape.
▶
Do not connect the condensate drain
pipework tightly to the waste-water pip-
ing.
min.
180
The product is equipped with a condensate trap (2).
▶
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.
▶
Connect the condensate discharge (1) to a condensate
discharge pipe (3) that has a minimum internal diameter
of 19 mm (30 mm internal diameter for all external pipes
that are fed out of the building) 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.
1 1
2
3
21