32
4.
Fill the heating system at boiler drain & fill valve
B
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
D
. The indicator must be in the green
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
C
. Route the hose into a
suitable container or drain outlet.
6.
Close the shut-off valves on the heating water side.
7.
Open air vent valve
C
and fill valve
B
in the heat-
ing return. Vent (flush) under mains pressure until
no more air noise is audible.
8.
Close air vent valve
C
and boiler drain & fill valve
B
.
Check the system pressure at pressure gauge
D
.
The indicator must be in the green band.
9.
Open the shut-off valves on the heating water side.
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.
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 rotating rectangle.
The filling function ends automatically after 20 min
or press for 4 s.
Checking all connections on the heating water and DHW sides for leaks
Danger
There is a 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.
!
Please note
Leaking hydraulic connections lead to appliance
damage.
■
Check the internal and on-site hydraulic con-
nections for leaks.
■
In the event of leaks, switch off the appliance
immediately. Drain the heating water. Check
the seating of seal rings.
Always
replace dis-
placed seal rings.
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.
4.
Disconnect the supply hose from the boiler drain &
fill valve.
5.
Open the gas shut-off valve.
Commissioning, inspection, maintenance
Filling the heating system
(cont.)
6179762
