Grundfos SB User Manual

3.6.1 Thermal protection
The pump has a built-in thermal switch and requires
no additional motor protection. If the pump is running
without water, or if it is otherwise overloaded, the
built-in thermal switch will cut out. When the motor
has cooled to normal temperature, it will restart
automatically.
3.6.2 Connecting to external controller
SB
SB pumps must be connected to an external
controller. We recommend a Grundfos Pressure
Manager: net.grundfos.com/qr/i/97506325
SBA
SBA pumps have an integrated control unit.
Related information
6.2 SB pumps
6.3 SBA pumps
3.6.3 Power supply failure
In case of a power supply failure, the pump restarts
automatically when power returns and runs for at
least 10 s.
4. Starting up the product
WARNING
Flammable material
Death or serious personal injury
‐ Do not use the pump for flammable
liquids, such as diesel oil, petrol or
similar liquids.
DANGER
Electric shock
Death or serious personal injury
‐ Do not use the pump in swimming
pools, garden ponds or similar places if
there are people in the water.
1. Open a tap in the system.
2. Switch on the power supply.
3. Check that the pump is running and water is
coming out of the tap.
4. Check that the pump is running and pressure is
being built up in the system.
5. Close the tap.
6. Check that pressure has been built up in the
system.
7. Check that the pump stops after 10 seconds.
Water is accumulated between the motor
housing and cover during submersion.
When the pump is stopped and lifted from
a submerged position, so the drain holes
are above water level, the water is drained
from the drain holes located under the red
ring.
TM083090
Connect SB pumps to an external
controller.
Related information
8.5 Leaking water from the drain holes
4.1
SBA starting and stopping conditions
When water is consumed in the water supply system,
the pump starts when the starting conditions are
fulfilled. This happens for example when a tap is
opened which makes the pressure in the system
drop. The control unit stops the pump again when
consumption stops, that is when the tap is closed.
Starting conditions
The pump starts when one of the following conditions
is fulfilled:
• The flow rate is higher than the minimum flow
rate.
• The pressure is lower than the start pressure.
Stopping conditions
The pump stops with a time delay of 10 s when the
flow rate is lower than the minimum flow rate.
The start pressure and minimum flow rate values are
shown in sections Pressure and Flow rate.
10
English (GB)

Grundfos SB Specifications

General

Brand	Grundfos
Model	SB
Category	Water Pump
Language	English