Rainwell RFD

Bladder Tanks

The Rainwel RFD is the ideal companion for bladder tanks. Most bladder tanks function with a complex system of pipes to divert the overflow, and a seperate filtering unit to remove roof debris. The Rainwell RFD brings these functions together to deliver:

  • Self-cleaning filtration
  • No complex over-flow plumbing
  • Easier and neater installation
  • Low maintenance

Operation

Critical to the installation procedure is the correct positioning of the Rainwell RFD's operating height on the downpipe. The RFD's operating height is determined by the bladder tanks overflow height range.

When the bladder reaches capacity, rainwater backs up to the RFD's diversion chamber to redirect the flow back into the downpipe.

The bladder tanks air release vent will need to sufficiently above the RFD diversion chamber.

Important

Consult the manufacturers installation instructions to determine the tanks overflow height range. The range is lowest and highest levels for the tank's overflow. Exceeding the highest level can cause tank damage.

Downpipe Preparation

  1. Mark the downpipe 45mm below the desired overflow height
  2. Ensure an area of 560mm above and 70mm below the mark is available on the downpipe.
  3. Cut the downpipe at the 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.

First Flush Diverter

To further improve roof rainwater quality and minimise tank maintenance a First Flush Diverter (FFD) can be used with the Rainwell RFD.

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

Note. When using a FFD with an Rainwell RFD ensure the lowest part of the invert on FFD's "T" junction is within overflow height range, and the Rainwell RFD is also positioned on the downpipe within the overflow height range (- 45mm).

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