Rainwell RFD

The Rainwell RFD can connect to the rainwater tank with watertight pipework above or below ground to either, the existing rainwater tank overflow outlet or new rainwater tank flange. A cover over the rainwater tank's leaf-strainer opening will prevent accidental entry and inhibit algae growth.

Fit supplied mounting brackets to the Rainwell RFD if the downpipe is against the wall, and if the downpipe is away from the wall, use straps with stand-off brackets above and below to secure the Rainwell RFD.

To install the Rainwell RFD on the downpipe; remove filter assembly and slide the Rainwell RFD into the upper donwpipe section to drop the overflow outlet flange into the lower section, and refit filter assembly.

A 90mm female rainwater tank flange is required and the existing overflow requires a mosquito-proof screen for tank ventilation.

Remove downpipe section

Create a horizontal line from 10mm min. below the tank existing overflow outlet invert to mark the Overflow height on the downpipe, then 325mm above this mark create the Top cut mark - ensure 50mm clearance above this mark is available. Cut the Overflow height/Top cut marks to remove the downpipe section.

Rainwater tank preparation.

Mark a spot for the new tank flange 130mm below the Overflow height - this measurement provides a fall to prevent pooling in the aboveground pipework. Create a 90mm dia. hole and use sealant when fixing the flange and on all elbow and pipe joins to make a watertight and secure connection between the rainwater tank and Rainwell RFD.

The mosquito-proof screen on the rainwater tank's overflow outlet must be removed and mosquito-proof vent cowl installed if a cover over the rainwater tank's leaf-strainer opening is fitted.

Remove downpipe section

Create a horizontal line from the centre existing overflow outlet to mark the Overflow height on the downpipe, then 325mm above this mark create the Top cut mark - 50mm clearance above this mark is required. Cut the Overflow height/Top cut marks to remove downpipe section.

Multiple Downpipe Connection

Ensure all Rainwell RFD's are at equal heights on the downpipes. Use the New Rainwater Tank Flange installation method.

Multiple Rainwell RFD System - PDF 51kb

The Rainwell RFD's overflow height on the downpipe must be the same as the bladder manufacturer's recommended overflow height. Exceeding the overflow height can cause bladder damage. The bladder's air release vent must be sufficiently above the Rainwell RFD's overflow outlet.

Connect 3 x 90mm 90˚ M/F elbows to the Rainwell RFD's connection flange to align the connection pipe to the downpipe. Swivel elbow #1 to direct pipes vertically or horizontally to the rainwater tank.

The first flush device is recommended when connecting the Rainwell RFD to the existing rainwater tank overflow outlet.

It will divert the initial rainfall containing soluble contaminants and will release water in the connecting pipes to prevent stagnation.

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

Rainwell RFD Installation Guides - PDF 149kb