Rainwell RFD

Benefits are maximised when the Rainwell RFD is connected to the tank's overflow outlet, and the tank's basket filter substituted and covered over. This arrangement will overcome the negative aspects associated with the basket filter:

• Risk of injury from falling from the tank when checking or emptying
• Risk of injury or drowning from accidental entry
• Time required for checking or emptying
• Water contamination from debris build-up decomposing
• Flood damage and water loss from debris blockage
• Frequent tank cleaning to remove sediment build-up
• Algae breeding from sunlight entering
• Water loss through evaporation

Operation requires the Rainwell RFD to be positioned on the downpipe with base of the Rainwell RFD horizontally level with the lowest part of the tank's overflow outlet invert.

The diagram indicates the Rainwell RFD's downpipe position for above, and below ground installations.

A laser or optical level can be used to create a horizontal level, or follow the method below.

Horizontal Level

1. You will need two people and a garden hose with 100mm clear tubes fixed at both ends - filled with water with a small air gap
2. With thumbs over the garden hose ends, take one end to the Tank's overflow outlet and the other end to the downpipe
3. At the Tank, position the clear section of hose near the lowest part of the overflow invert
4. At the downpipe, move the garden hose up or down until the water level is level to the lowest part of the overflow invert, then at the downpipe end, mark the downpipe at the water level - creating a horizontal level.

1. Create a horizontal level mark on the downpipe. See above
2. Ensure an area of 560mm above and 70mm below the horizontal level mark is available on the downpipe.
3. Cut the downpipe at the horizontal level mark and 470mm above.
4. Clean burs and coat edges with rust prevention paint.
5. Slide the RFD into the upper portion of the downpipe, then position into the lower portion.
6. Secure the downpipe above and below the RFD with straps, and if required, use the spacers provided.

Connection

Rainwell RFD: Joining 3, 90mm 90˚ M/F elbows to the RFD connection pipe flange will enable a vertical pipe alongside the downpipe, or horizontally against the wall.

Ensure all pipe joins are sealed and installation complies with local regulatory authority requirements.

To further improve roof rainwater quality and minimise tank maintenance a First Flush Diverter and Sediment Catcher can be used inconjunction with the Rainwell RFD.

The First Flush Diverter captures initial rainfall containing a high level of fine and soluble contaminants in a storage chamber, when full, a float valve seals the chamber and diverts rainwater to the tank. A trickle valve releases the captured raniwater to reset a float valve.

The Sediment Catcher is a length of angled or, vertical pipe between the First Flush Diverter and the tank, which allows suspended debris to descend from the rainwater before reaching the tank, as the First Flush Diverter's trickle valve releases rainwater, sediment is drawn into the storage chamber.

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