Start-up 7
0020200954_00 SUSTAIN ..c Installation and maintenance instructions 19
7.5 Preventing low water pressure
The filling pressure should be between 0.03 and 0.3 MPa
(0.3 and 3 bar).
If the heating installation extends over several storeys,
higher filling pressures may be required to avoid air entering
the heating installation.
If the water pressure falls below 0.05 MPa (0.5 bar), the
value flashes in the display.
If the water pressure falls below 0.03 MPa (0.3 bar), the
product switches off. The display shows 0.0 MPa (0.0 bar).
Fault F.22 is stored in the fault list.
▶ Top up the heating water to start the product up again.
◁ The pressure value flashes in the display until a
pressure of 0.05 MPa (0.5 bar) or higher has been
reached.
7.6 Switching on the product
▶ Switch on the product via the main switch installed on-
site.
7.7 Filling the heating installation
Preliminary work
▶ Rinse the heating installation through.
1. Remove the plug from the automatic air vent (1) on the
pump by turning it twice.
2. Select the check programme P.05.
3. Fill with water until the required filling pressure is
reached.
◁ The product does not start up.
◁ The heating system pressure flashes in the display.
◁ If the pressure is lower than 0.05 MPa (0.5 bar) and
then is above 0.07 MPa (0.7 bar) for longer than 15
seconds, the automatic purging function is activated.
4. Leave the pump's automatic air vent open.
5. Ensure that the hot water pressure corresponds to the
required filling pressure. If it does not, refill the product.
6. Check whether all connections are leak-tight.
7.8 Purging the heating installation
1. Before purging the system, ensure that the filling pres-
sure in the heating installation is above the minimum
level.
2. Open all thermostatic radiator valves.
3. Open all purging valves in the system.
4. To purge the heating installation, select the check pro-
gramme P.06.
◁ The product does not start up.
5. Purge the lowest radiator until water flows out of the
purging valve without bubbles.
6. Purge all other radiators until the entire heating installa-
tion is filled with water.
7. Close all purging valves in the system.
8. If there is still too much air in the heating installation at
the end of the check programme P.06, restart the check
programme.
7.9 Purging the product
1. Select check programme P.07.
◁ The product does not start up, the internal pump
operates intermittently and purges the heating circuit
and the small hot water circuit.
2. Make sure that the filling pressure of the heating install-
ation does not fall below the minimum filling pressure.
3. If there is still too much air in the heating installation at
the end of the check programme P.07, repeat the check
programme.
7.10 Filling the condensate siphon
1. Unclip the lower section of the siphon (1) from the up-
per section of the siphon (2).
2. Remove the float (3).
3. Fill the lower section of the siphon with water up to 10
mm below the upper edge of the condensate drain pipe-
work.
4. Re-insert the float (3).
Note
Check whether the float is present in the
condensate siphon.
5. Clip the lower section of the siphon (1) into the upper
section of the siphon (2).
7.11 Filling the hot water circuit
1. Open the water tap to fill the hot water circuit.
2. Close the water tap once the appropriate volume of
water has flowed out.
◁ The hot water circuit is filled.
3. Check all connections and the entire system for leak-
tightness.
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