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Filling the heating system
4. Fill the heating system at boiler drain & fill valve
in the heating return (on the connection set or on
site). Minimum system pressure > 1.0 bar
(0.1 MPa). Check the system pressure at pressure
gauge
. The indicator must be in the green
D
band. If necessary, open the on-site air vent
valves.
Note
Ensure that the safety valve does not respond
when you are filling the system. If the flow rate
through the safety valve becomes too high, water
may enter the combustion chamber.
5. Fit hose to air vent valve
suitable container or drain outlet.
Activating the filling function
If the filling function is to be activated after commis-
sioning.
Tap the following buttons:
1.
and OK simultaneously for approx. 4 s, then
release.
2. Use
/
to select "b.5" for the commissioning
assistant.
3. OK
4. The display shows "AP".
Press
for 4 s.
Checking all connections on the heating water and DHW sides for leaks
Danger
Risk of electric shock from escaping heating
water or DHW.
When commissioning and after carrying out
maintenance work, check all water side connec-
tions for leaks.
Venting the heating system
1. Close the gas shut-off valve and switch the appli-
ance ON.
2. Activate the venting program (see commissioning
assistant or following chapter).
3. Adjust the system pressure.
The display shows the system pressure.
(cont.)
B
. Route the hose into a
C
Commissioning, inspection, maintenance
6. Close the shut-off valves on the heating water side.
7. Open air vent valve
C
ing return. Vent (flush) under mains pressure until
no more air noise is audible.
8. Close air vent valve
C
valve
.
B
Check the system pressure at pressure gauge
The indicator must be in the green band.
9. Open the shut-off valves on the heating water side.
5. Use
/
to select "C.1" for the filling function.
6. OK
7.
/
to select "ON" for filling.
8. OK
The filling function is activated. The display shows
a circulating rectangle.
The filling function ends automatically after 20 min
or press
for 4 s.
4. Disconnect the supply hose from the boiler drain &
fill valve.
5. Open the gas shut-off valve.
and fill valve
in the heat-
B
and boiler drain & fill
D
.
37
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