13
Operating the Appliance
6 720 610 604 GB (03.06)
Check the central heating system pressure
B The pointer on the pressure gauge (8.1) should be about 1 bar.
B If the pointer is below 1 bar (when the system is cold), top up
the system with water until the pointer is 1 bar. Your installer
will have shown you how to do this.
B The maximum operating pressure of 2.5 bar at maximum
central heating flow temperature must not be exceeded. If the
pressure increases to 3 bar then the relief valve (15) opens.
Fig. 3
170
170
172
173
171
8.1
15
bar
0
1
2
3
4
6 720 610 598 - 03.2O
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