Installation Guide

Installation
WHAT’S IN THE BOX? TOOLS/MATERIALS YOU MAY REQUIRE
Delta chamber end caps x 2
Cage/Seat & Ball
Chamber support spacer
100mm (4”) socket reducer
Transparent Rapid Release Exit Funnel
Electronic Release Valve
Primary Filter Screen
Tape measure
Marker pen
Saw
File
Priming fluid
Solvent weld glue
Screws/Anchors
Screw driver
Drill
100mm (4”) pipe
INSTALLATION
1 - It is a requirement to install a rain head upstream of any down pipe feeding the Delta In-Ground First
Flush. Large debris must not enter the First Flush chambers to prevent blockages and damage to the
Electronic Release Valve
2 - Select an installation point for your Delta In-Ground First Flush. Your diverter must be installed on a
slope (minimum 5% or 1 in 20) to ensure it drains after each rainfall event. Your first flush T-junction should
be at the lowest point in your Rain Harvesting sub-surface pipework or at a location to allow for easy
installation and draining of the Electronic Release Valve. The T-junction can also be installed to replace the
90° bend at the base of the vertical pipe feeding your rainwater tank. If the Rain Harvesting sub-surface
pipework is not part of a “wet” system, the T-junction will need to be installed with the branch below the
main line and a 90° bend to direct first flush of water to the Delta. The outlet must also be accessible for
maintenance and inspection. This may be achieved by running pipe to a location aboveground or installing
an access pit (e.g. stormwater pit) (refer to Figure 1 for suggested installation locations).
3 - Remove Delta First Flush components from packaging and lay out parts ready for assembly
4 - Determine chamber length using the calculation chart provided, based on your Rain Harvesting roof
collection area and considered pollution level (see Figure 8 - Delta Diversion Chamber Calculator).
5 - Using a tape measure, mark, cut and deburr 6 equal lengths of 100mm (4”) pipe to be used as the
Chamber Pipes
NOTE: It is critical that all the Chamber Pipes are exactly equal length. It is also recommended to apply a
small chamfer to the outside ends of the six Chamber Pipes to improve ease of insertion into the Chamber
Sockets.
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