Benchmark RD 532i Installation And Servicing Instructions page 108

Operating the Appliance
Cold water inlet valve (173)
B Turn handle so that it is in line with direction of flow.
When handle is at right angles to direction of flow, the valve is
closed.
170
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.
12
173
172
6 720 610 577-02.1O
6 720 610 600 GB (03.06)