Benchmark ZWB 7-25 R 25 HE Users Instructions And Customer Care Manual page 11

Check the central heating system pressure
The pointer on the pressure gauge (8.1) should be about
1 bar.
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.
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.
6 720 610 577 GB (03.11)
Supplied By www.heating spares.co Tel. 0161 620 6677
Operating the Appliance
2
3
1
4
0
bar
8.1
CH
C
15
6 720 610 600-03.1O
11