Avoiding Low Water Pressure; Top Up Vuw Boilers Using A Filling Device; Fill And Purge The Hot Water System; Filling The Condensate Siphon - Vaillant ecoTEC plus SERIES Installation And Maintenance Instructions Manual

> Check the pressure in the heating system and top up
with water if necessary.
> Close the filling valve and the cold water valve.
10.8

Avoiding low water pressure

To prevent damage to the heating installation caused by
low water pressure, the ecoTEC plus is fitted with a water
pressure sensor.
If the water pressure falls below 0.08 MPa (0.8 bar), the
boiler indicates low pressure by displaying a flashing pres-
sure value.
If the water pressure falls below 0.05 MPa (0.5 bar), the
boiler switches off.
The fault message F.22 appears in the display.
> Top up the water and switch the boiler on again.
A flashing pressure value appears on the display until a
pressure of 1.1 bar or higher has been reached.
> If you notice frequent drops in pressure, then determine
and eliminate the cause.

10.8.1 Top up VUW boilers using a filling device

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10.3 Filling the VUW boiler using a filling device
The VUW boilers are equipped with a filling device.
> Insert the double non-return valve (1) of the filling line
into the cold water stop valve and secure the valve with
the spring clip (2).
> To fill, first open the stop valve (3).
> Open the stop valve (4) so that the water flows into the
heating system. Fill the heating system as described in
¬ section 10.7.
Installation and maintenance instructions ecoTEC plus 0020116700_01
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> After filling, close both stop valves and disconnect the
filling device by pulling the double non-return valve from
the cold water stop valve.
i
Both stop valves must be closed during the
operation of the heating system and the filling
line must be removed from the double non-
return valve again.
10.9

Fill and purge the hot water system

> Open the cold water stop valve on the boiler (only for
VUW boilers).
> Fill the hot water system by opening all the hot water
draw-off points until water comes out.
As soon as water comes out of all the hot water draw-off
points, the hot water circuit is filled completely and also
purged.
10.10

Filling the condensate siphon

Danger!
a
Risk of poisoning from escaping flue gas!
An empty or insufficiently filled condensate
siphon may allow flue gas to escape into
the room air.
> Fill the condensate siphon with water
before starting up the boiler.
10.4 Filling the condensate siphon
> Remove the lower part (1) of the condensate siphon by
turning the bayonet fitting anti-clockwise.
> Fill the lower section with water until about 10 mm below
the upper edge.
> Re-attach the lower section to the condensate siphon.
Start-up 10
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