Commissioning
44
Installation and maintenance instructions ecoTEC plus 0020134833_01
10
10.7.3
Flushing the system for the first time
("cold")
i
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.
>
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
pressure 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.
i
If you notice frequent drops in pressure, then
determine and eliminate the cause, i.e water
leaks in the system. Failure to do so along with
frequent topping up will result in system corro-
sion and subsequent failures.
10.9
Topping up the VUI boiler using a filling
device
3
1
2
4
10.3
Filling the VUI boiler using a filling device
The VUI 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
.
>
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.
10.10
Fill and purge the hot water system
>
Open all domestic hot water draw-off points.
>
Open the cold water stop valve on the boiler. The water
then flows through the boiler and the layered storage
tank to the domestic hot water draw-off point.
>
Fill the hot water system by opening all the hot water
draw-off points until water comes out.
>
Starting with the bottom, lowest-lying draw-off point,
close all of the domestic hot water draw-off points one
after the other.
The hot water circuit has thus been completely filled and
purged.
Содержание ecoTEC plus VUI
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