42
Fig. 30
E
ON/OFF switch
1. Check the pre-charge pressure of the expansion
vessel.
2.
Close gas shut-off valve
A
.
3. Activate the filling function (see commissioning
assistant or following chapter).
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
Tap the following buttons:
1.
2. "Service"
3. Enter password "viservice".
4. Use to confirm.
5. "Service functions"
6. "Filling"
7. Activate the filling function with .
The display shows the system pressure.
The filling function ends automatically after 20 min
or when you tap .
Commissioning, inspection, maintenance
Filling the heating system (cont.)
5593201
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