Filling The Heating Installation; Purging The Heating System; Flushing The System For The First Time ("Cold") - Vaillant ecoTEC plus SERIES Installation And Maintenance Instructions Manual

10 Start-up
> Remove the front casing from the boiler
(¬ section 4.7).
10.2 Automatic air vent
> Release the cap of the automatic air vent (1) by up to
two rotations.
> Open all thermostatic radiator valves.
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The ecoTEC plus purges the heating circuit inde-
pendently during continuous operation via the
automatic air vent.
> Only for VUW boilers: Select test program P.06
(¬ section 10.4).
The diverter valve moves to the central position, the pumps
do not run and the boiler does not switch to heating mode.

10.7.1 Filling the heating installation

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Ensure that the filling and drainage cock on the
heating installation is connected to a cold water
valve as per standard.
> In order to fill the heating installation, first open the cold
water valve.
> Open all thermostatic radiator valves.
> Check that both service valves on the boiler are open.
> Slowly open the stop valve on the filling line so that the
water flows into the heating system.
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If the water pressure in the heating system is
too low, the display switches between fault mes-
sage F.22 and the display of the current pressure
when the boiler is switched on.
> Purge the lowest radiator until water flows out of the
purging valve without bubbles.
> Purge all other radiators until the entire heating system
has been filled with water. Close all purging valves.
42
> Use the display to monitor the rising filling pressure in
the heating installation.
> Top up with water until the pressure gauge display is in
the middle of the grey area and the required filling pres-
1
sure appears on the display.
> After filling, close the stop valve at the filling line and the
cold water valve.
> Check all connections and the entire system for leaks.

10.7.2 Purging the heating system

> To purge the heating installation, select test program
P.00 (¬ section 10.4).
The boiler does not start up, the internal pump operates
intermittently and, as an option, purges the heating circuit
or the hot water circuit. The display shows the filling pres-
sure of the heating installation.
> The filling pressure of the heating installation must not
fall below 0.08 MPa (0.8 bar) when purging is in progress
as, otherwise, this will not be carried out properly.
The test program P.00 runs for 7.5 minutes per circuit.
At the end of the filling procedure, the filling pressure of
the heating installation should be at least 0.02 MPa (0.2 bar)
above the counterpressure of the expansion vessel
³ P
(P + 0.02 MPa (0.2 bar)).
Installation Exp
> If there is still too much air in the heating installation at
the end of test program P.00, repeat the test program.
> Check all connections for leaks.
10.7.3 Flushing the system for the first time
("cold")
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The entire heating system must be flushed
through completely at least twice: once cold and
once hot, in accordance with the following
instructions.
> Check whether all thermostatic radiator valves and both
service valves on the boiler are open.
> Connect a hose to the drain valve that is located at the
lowest position in the heating system.
> Open the drain cocks and all the purging valves on the
radiators so that the water flows quickly and completely
out of the heating system and the boiler, in order to
remove the contamination caused during installation out
of the heating system before the boiler is started up.
> Close the drain cocks.
> Refill the heating system with water, as described in
(¬ section 10.7).
> Check that the expansion relief valve of the heating sys-
tem is functioning correctly by turning the handle on the
valve.
Installation and maintenance instructions ecoTEC plus 0020116700_01