Sealed Systems
23
Figure 7-4: Position of water supply valve
7
.3 Fill the Sealed System
Automatic air vents are fitted to the top
of the boiler. The procedure for filling the
sealed system is as follows:
1. Only ever fill or add water to the
system when it is cold and the boiler
i
s off. Do not overfill.
2. Check that the fill point valve is
closed as shown by the large arrow
in Figure 7-4.
3. Remove the cap shown with a
suitable spanner.
4. Ensure that the flexible filling loop
supplied with the boiler (see Fig.
Figure 7-4) is connected and that
the double check shut off valve
connecting it to the water supply is
closed. (A valve is open when the
operating lever is in line with the
valve, and closed when it is at right
angles to it).
5. Open the fill point valve shown in
Figure 7-4.
6. Gradually open the double check
valve from the water supply until
water is heard to flow.
7. When the white needle of the
pressure gauge is between 0.5 and
1 bar, close the valve.
8. Vent each radiator in turn, starting
with the lowest one in the system,
to remove air.
9. Continue to fill the system until the
pressure gauge indicates between
0.5 and 1.0 bar. Close the fill point
valve.
10. Repeat steps 6 and 7 as required.
11. Close the fill point and double check
valves either side of the filling loop
and disconnect the loop.
12. Refit the cap to the fill point valve
shown by the large arrow in
Figure 7-4.
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