0020308118_05 Installation and maintenance instructions 43
9.9 Filling the heating installation
1. Start check programme P.008. (→ Section 8.4)
◁ The prioritising diverter valve moves to the mid-
position, the pumps do not run and the product
does not switch to heating mode.
2. Observe the information on treating heating water.
(→ Section 9.3)
Validity: Product with integrated hot water generation
▶ Open all radiator valves (thermostatic valves) of the
heating installation.
▶ Fit the double non-return valve (1) of the filling line to
the cold-water isolation valve and secure the valve
with the spring clip (2).
▶ To fill, first open the isolation valve (3).
▶ Open the isolation valve (4) so that the water flows
into the heating system. Fill the heating system.
▶ Purge the lowest radiator until water flows out of the
purging valve without bubbles.
▶ Purge all other radiators until the entire heating sys-
tem has been filled with water.
▶
Close all purging valves.
▶ Monitor the rising filling pressure in the heating install-
ation.
▶ Fill with water until the required filling pressure is
reached.
▶ After filling, close isolation valve (4) first and then isol-
ation valve (3). Disconnect the filling device by remov-
ing the double non-return valve from the cold-water
isolation valve.
Note
Both isolation valves must be closed while
the heating system is operating and the
filling line must be removed from the double
non-return valve again.
Validity: Product with connected domestic hot water cylinder
▶ Connect the filling/draining cock in the heating installa-
tion to a heating water supply, if possible with the cold
water tap, in accordance with the relevant standards.
▶ Open the heating water supply.
▶ Open all radiator valves (thermostatic valves) of the
heating installation.
▶ If necessary, check that both service valves on the
product are open.
▶ Slowly open the filling/draining cock so that the water
flows into the heating system.
▶ Purge the lowest radiator until water flows out of the
purging valve without bubbles.
▶ Purge all other radiators until the entire heating sys-
tem has been filled with water.
▶ Close all purging valves.
▶ Monitor the rising filling pressure in the heating install-
ation.
▶ Fill with water until the required filling pressure is
reached.
▶ Close the filling/draining cock and the cold water tap.
9.10 Purging the heating installation
1. When you top up the heating water, start check pro-
gramme P.000. (→ Section 8.4) If fault code F.022 was
present for longer than 30 seconds, it is sufficient to
start the purge programme in order to reset the fault
code. It is not necessary to press the reset button.
◁
The product does not start up, the internal pump
operates intermittently and automatically purges the
heating circuit or the domestic hot water circuit.
◁ The display shows the filling pressure of the heat-
ing installation.
2. Ensure that the filling pressure of the heating installa-
tion does not fall below the minimum operating filling
pressure.
– ≥ 0.08 MPa (≥ 0.80 bar)
3. Check whether the filling pressure of the heating in-
stallation is at least 0.02 MPa (0.2 bar) above the dia-
phragm expansion vessel's counter-pressure (P
system
≥
P
diaphragm expansion vessel
+ 0.02 MPa (0.2 bar)).
Result:
Filling pressure of the heating installation is too low
▶ Fill the heating installation. (→ Section 9.9)
4. If there is still too much air in the heating installation at
the end of check programme P.000, restart the check
programme.
9.11 Filling and purging the domestic hot water
system
Validity: Product with integrated hot water generation
1. Open the cold-water isolation valve on the product.
2. Fill the domestic hot water system by opening all the
domestic hot water draw-off valves until water es-
capes.
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