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SYSTEM DESIGN AND PLANNING INFOrMATION
4.0
(e) System filling and topping procedure
The appliance is supplied with connections points on the mains cold water
inlet and central heating return isolating taps as shown in figure 4.3 to which
the filling loop kit supplied can be temporarily fitted. The system pressure will
be indicated on the appliance digital display.
Figure 4.3
Figure 4.4
CH Return
1
3
3
4
Sealed System Filling Method - 1
1.
Control / Isolating Valve
.
Double check valve
3.
Hose unions
4.
Temporary connection
Filling loop
Cold Water
1
Supply Pipe
If an alternative filling method is used for filling and
topping up the water loss from the system then it must
be fitted in an accessible position and it must be:-
•
In accordance with all relevant water supply
regulations and use approved equipment i.e.
Guidance G4. and recommendation R4.
of the 'Water Regulations Guide' . Typical filling
arrangements are shown in figure 4.4. if installed
in GB
•
In accordance with the current edition of I.S. 813.
if installed in IE
In GB, the sealed primary circuit may be filled or
replenished by means of a temporary connection
between the circuit and the cold water supply, provided
a 'Listed' i.e WRAS approved double check valve or some
other no less effective back flow prevention device is
permanently connected at the inlet to the circuit and
the temporary connection is removed after use.
CH Return
1
5
1
4
3
Sealed System Filling Method - 2
1.
Control / Isolating Valve
.
Type C A Backflow Prevention Device
3.
Tundish
4.
Air Gap
5.
Pressure regulator (optional)
Page 16
Cold Water
Supply Pipe
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