Connecting The Tap Water Pipe; Connecting The Rainwater Inlet Pipe - Grundfos SCALA1 System Instructions Manual

3.3 Connecting the tap water pipe

When tightening the pipe, make sure the
tap water hose does not turn.
The float switch that regulates the
backflow of the tap water is designed to
operate at a maximum pressure of 4 bar
and a flow rate of more than 10 L/min. If
the mains water pressure exceeds this
value, install a pressure regulator
upstream of the float and add a mesh filter
to protect the pressure regulator from any
debris that could compromise its
operation. Excessive pressure in the pipes
of the tap water network can lead to a leak
or a malfunctioning float switch.
We recommend installing an on/off tap
upstream of the float switch to cut off the
mains water supply in case of breakage or
malfunction so that maintenance can be
carried out safely.
1. Connect the tap water pipe to the 3/4 inch drain
on the right side of the tank.

3.4 Connecting the rainwater inlet pipe

The inlet pipe must have an internal diameter of at
least 25 mm, and it must always slope towards the
tank.
We recommend installing a float switch
fitted with an inlet strainer and a non-return
valve in the rainwater tank.
1. Install the system as close to the rainwater tank
as possible.
a. Never exceed a suction lift of 6 metres for
optimum performance of the pump. The total of
the suction distance and the suction loss
depends on the length of the inlet pipe.
b. The inlet point must always ensure the suction
of clean water. Use a suction kit, and install it
as shown here.
Installation of the suction kit
2. Connect the inlet pipe to the connecting piece.
3. Install a feed pump if the maximum pipe length
according to the suction lift is outside the curve.
See the graph below.
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