RainWater Harvesting Rain Backup in a Box Manual

Plug-and-play mains water backup

for direct feed rainwater harvesting systems

Mains backup unit to ensure direct feed

rainwater harvesting systems have

sufficient water in times of low rainfall.

Toilet flushing, clothes washing and any

outdoor use of water can be serviced by

the submersible water pump inside a

tank.

In low rainfall the supplied float switch

will detect if the system is empty. This

signals an electrically activated solenoid

to open in the control unit, allowing

mains water to flow into the system.

When the float rises the solenoid is shut.

This means the tank is only partially filled- leaving a bulk

of the storage tank remains empty ready to admit the

water from the next rain shower.

U.K. Building Regulations require that rainwater cannot

possibly flow back into the mains water supply. For this

reason all mains backup devices must have an air gap where the mains water flows into the

rainwater tank. The simplest way to do this is for the mains water to flow through open air into an

inverted cup-shaped device called a tundish. The Rain Backup in a Box (Product ID RWH-BUB01)

features a multi-route anti-splash "tundish" and overflow incorporated into one transparent section.

It is housed with the solenoid in an off-white plastic cabinet 325 L x 260 H x 95 D millimetres. The

float switch is provided with around 15 metres of cable. Please contact your supplier if you require

longer cable

19 November 2018

BUB01 Manual FL15 - 2018-11-19.doc

Table of Contents

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Page 1 The simplest way to do this is for the mains water to flow through open air into an inverted cup-shaped device called a tundish. The Rain Backup in a Box (Product ID RWH-BUB01) features a multi-route anti-splash “tundish” and overflow incorporated into one transparent section.
Page 2 The overflow pipe (middle) of the Rain Backup in a Box should flow to the exterior through a pipe which offers no constriction. It is designed to avoid flooding of the house if the pipe from the tundish to the underground tank is blocked up, and to provide a visual alert to the building occupants.
Page 3 Attach the wire of the float switch, at a point about 25mm away from the body (plastic section) of the float switch, with a nylon tie wrap to a suitable point (around 30-50cm) from the base of the storage tank. The 110mm downpipe from the filter to the calmed inlet on the floor of the tank is the best securing point.
Page 4 19 November 2018 BUB01 Manual FL15 - 2018-11-19.doc...
Page 5 12 volt charger and float switch In the event any wire has to be detached from the Rain Backup in a Box, for example when pulling the float switch wire through a service pipe, we show here the wiring for the 4 pole connector strip inside the box under the coloured logo.