Operation
12
Operating instructions ecoTEC plus 0020134822_01
4
4.6.3
Checking the filling pressure of the heating
installation
b
Caution.
Low filling pressure may cause damage
to the unit.
Operating the heating installation with low
filling pressure can cause damage to the
boiler and the heating installation. The
boiler switches off automatically when the
filling pressure falls too low.
>
Fill up the heating installation as soon as
the filling pressure falls below 0.08 MPa
(0.8 bar).
To avoid operating the system with insufficient water and to
prevent possible damage associated with this, your boiler is
fitted with a pressure sensor. This signals the low pressure
level if the level falls below 0.08 MPa (0.8 bar) by the water
pressure value in the display flashing.
>
Fill up the heating installation as soon as the pressure
value in the display starts to flash. (
¬ section 4.6.4
).
i
If the filling pressure of the heating installation
falls below 0.05 MPa (0.5 bar), then the boiler
switches off and the fault message
F.22
appears
in the display.
The ecoTEC plus boiler has a digital pressure display. You
can see the filling pressure in the right bar graph display or
display the exact value using the selector buttons to the
right of the display.
1,0
Water pressure
Back
0,8
6,0
1
2
3
4.8 Digital display of filling pressure
>
Press the on/off switch (
1
) (
¬ Fig. 4.7
), to switch on the
boiler
>
Press the right-hand selector button
twice.
(" ")
The value of the flow temperature appears in the display.
Press the right-hand selector button to access the water
pressure display.
The current filling pressure (
1
) and the minimum (
3
) or
maximum water pressure (
2
) that is to be set appear in the
display.
If the heating installation extends over several storeys, a
higher filling pressure may be required for the heating
installation.
>
Ask your competent person for details.
The filling pressure must lie between 0.01 MPa (1.0 bar) and
0.04 MPa (4.0 bar) when the heating installation is cold in
order for the heating installation to operate properly. If the
filling pressure is below this range, then you must top up
the water before start-up.
>
Check the filling pressure of the heating installation dur-
ing start-up.
4.6.4
Filling the heating installation
b
Caution.
Tap water that is extremely calciferous
or corrosive or contaminated by chemi-
cals can cause damage to the boiler.
Unsuitable tap water damages the seals
and diaphragms, blocks components in the
boiler and heating installation through
which the water flows and causes noise.
The heating installation must be hydrauli-
cally separated from the unit using a plate
heat exchanger. If the heating installation
and boiler are operated with a system sepa-
ration device, water treatment will not be
necessary up to a hardness of 4.48 mol/m
3
(448 mg/l). Should there be good grounds
not to use a system separation device, the
heating water must be processed according
to strict guidelines. This must take place in
a treatment plant.
>
Only fill the heating installation with suit-
able water. The calcium content of the
water should not exceed the following
hardness in relation to the stated system
volumes:
- 1000 l: up to 1.09 mol/m
3
(109 mg/l)
- 2000 l: up to 0.55 mol/m
3
(55 mg/l)
- 4000 l: up to 0.26 mol/m
3
(26 mg/l)
- 7200 l: up to < 0.14 mol/m
3
(14 mg/l)
To this end, both the water used for ini-
tial filling and the water for any top-ups
must be treated.
>
In case of doubt, consult your competent
person.
