Evolution Aqua NEXUS 220 - Page 18

GRAVITY FED INSTALLATION INSTRUCTIONS
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NEXUS 220 GRAVITY FED INSTALLATION
The water on a Gravity fed system should be fed from an appropriately placed bottom drain
through at least a 4 inch (110mm) pipe with as short a length and fewer bends as possible
(For optimum flow swept bends should be used). At the end of the bottom drain line before
entering the Nexus, a valve is required so that the line can be shut and the Nexus isolated.
For long bottom drain pipe runs, it is recommended that a ‘T’ purge valve line is installed
to remove solids that may settle in the bottom drain line. This should discharge straight to
waste (if possible) or into a suitably sized sump.
It is very important that when laying the bottom drain line that there is no section where the
pipework rises then falls as airlocks can form in this area which will block flow. Figure 12
below describes what should and shouldn’t be done.
Pipework should be level until reaching the filterhouse where it should ideally go through a
swept bend 90 into the Nexus inlet.
From Pond
To Nexus
From Pond
To Nexus
From Pond
To Nexus
From Pond
To Nexus
Figure 12. Figure 12.1.
Figure 12.2.