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8 COMMISSIONING
8.11
System check:
Ensure that the electrical supply to the pump is switched off
before opening the mains water supply stopcock and checking for leaks.
8.12
Check vessel pre-charge pressure:
It is important to have the correct pre-charge pressure in the vessel for your
site conditions to optimise performance. The vessel is supplied with a
pre-charge pressure of approximately 1.4 bar, and should never have a preset
pressure of less than 0.5 bar.
Checking and adjustment to the vessel pre-charge air pressure can only be
carried out when the vessel is empty (contains no water).
8.13
Check mains static pressure:
z
Now close outlets and check pressure gauge after ‘Y’ strainer - for static
mains pressure and note it. This should be done at peak times of use.
z
Turn stopcock off and leave outlet taps open.
8.14 Check the chart below for the correct vessel pressure against the static mains
pressure recorded.
Using a pressure gauge check the vessel and adjust to suit through the
schrader valve.
Warning: NOTE PRV setting must not exceed 5.0 bar.
MJ3 pump max.
set pressure
Static mains
pressure
Set vessel
pre-charge
pressure to
Differential
Set PRV
maximum
setting to
bar
bar
bar
bar
3 bar
1.0
1.2
1.8
1.0
3 bar
1.5
1.2
1.8
1.5
3 bar
2.0
1.2
1.8
2.0
3.5 bar
2.5
1.7
1.8
2.5
3.5 bar
3.0
1.7
1.8
2.5
Fig. 28
