34
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
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.
4.
Disconnect the supply hose from the boiler drain &
fill valve.
5.
Open the gas shut-off valve.
Activating the venting function
If the venting 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.2"
for ventilation.
6. OK
7.
/
should be used to select
"ON"
to switch on
the ventilation.
8. OK
The venting function is activated. The display
shows a rotating rectangle.
The venting function ends automatically after
20 min, or press for 4 s.
Checking the gas type
The boiler is equipped with an electronic combustion
controller that adjusts the burner for optimum combus-
tion in accordance with the prevailing gas quality.
■
For operation with natural gas, no adjustment is
therefore required across the entire Wobbe index
range. The boiler can be operated within the Wobbe
index range 9.5 to 15.2 kWh/m
3
(34.2 to
54.7 MJ/m
3
).
1.
Check with your gas supply utility regarding the
gas type and Wobbe index.
2.
Record the gas type in the service report.
Commissioning, inspection, maintenance
Filling the heating system
(cont.)
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