Emergency Overflow Connection; Mains Water Connection; Tank Feed Pipe Connection; Installing The Float Switch - Graf MAINS-ON-TAP Manual De Instrucciones

3.2

Emergency overflow connection

The emergency overflow is constructed using waste pipe (21.5 mm / 0.8"). In areas with a floor drain it is
sufficient to allow overflowing water to discharge from the unit to the sewer system without a connection,
because no water is discharged in normal operation. If there is no floor drain, the emergency overflow is
connected to the wastewater network.
3.3

Mains water connection

To connect the solenoid valve to the mains water network, use a standard connecting pipe. The valve is
fitted with a quick fastener. The pipe therefore simply needs to be inserted into the coupling, where it
forms a seal.
Installation of an additional shut-off valve will make future maintenance work easier.
3.4

Tank feed pipe connection

Water is fed to the tank through a pipe with a steady downhill incline of the specified diameter (minimum
of 36 mm / 1.4") at the connection fitting.
The feed pipe should be routed through an empty pipe acting as a conduit.
Water is fed into the tank via gravity pressure only from the location of the Mains-on-Tap unit to the
rainwater tank. The installation location must therefore be higher than the highest possible water level in
the rainwater tank.
3.5

Installing the float switch

The float switch (level sensor) is installed in the tank as shown in Fig. 1.
The mains cable including float must be pulled through a duct pipe acting as a conduit, to the tank. (The
mains cable is not suitable for laying directly in the ground.)
The installation height of the level sensor determines the switch-on point for the top-up of mains water
into the rainwater tank.
Distance:
between float and tank base > 50 mm / 2"
Fig. 1
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3. Assembly and installation
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Mains cable
Disc-shaped
weight
Float
Tank base