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7 COMMISSIONING
7.11 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.
Checking and adjustment to the vessel pre-charge air pressure can only be
carried out when the vessel is empty (contains no water).
7.12 Check mains dynamic pressure:
Open outlets and check pressure gauge after 'Y' strainer - for dynamic
z
mains pressure and note it.
Turn stopcock off and leave outlet taps open.
z
7.13 Check the chart below for the correct vessel pressure against the dynamic mains
pressure recorded.
Mains pressure
bar
1.5
2.0
2.5**
3.0
3.5
4.0
*Adjust pressure regulating valve down to these settings where possible.
**Recommended setting.
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.
7.14 On completion of the installation, follow the commissioning process below.
Leave all outlet valves closed.
z
Turn on stopcock and open inlet ballvalve, both pressure gauges on inlet and
z
PRV will start to show movement as the mains pressure fills the system.
Check for leaks on all joints made.
z
The incoming mains pressure will start to fill the vessel with water.
z
The time taken to fill the vessel will vary depending on the vessel size and mains
water pressure.
Set vessel
pre-charge pressure
to
bar
0.55
0.55
1.0
1.5
2.0
2.5
Fig. 18
Differential
bar
1.0
1.5
1.5
1.5
1.5
1.5
- 14 -
Set PRV maximum
setting to
bar
2.0
2.5
3.0*
3.5
4.0
4.5
Cont ...
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