Viessmann B0KA Installation And Service Instructions Manual page 33

Filling the heating system
E DC
Fig. 22
ON/OFF switch
E
1. Check the pre-charge pressure of the expansion
vessel.
2. Close gas shut-off valve
3. Activate the filling function (see commissioning
assistant or following chapter).
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 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.
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
(cont.)
A B
.
A
Commissioning, inspection, maintenance
5. Fit hose to air vent valve
suitable container or drain outlet.
6. Close the shut-off valves on the heating water side.
7. Open air vent valve
ing return. Vent (flush) under mains pressure until
no more air noise is audible.
B
8. Close air vent 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.
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.
. Route the hose into a
C
and fill valve in the heat-
C B
and boiler drain & fill valve
C
D .
33