7. Preparation Instructions
CAUTION! Draper Tool recommends that the
pump is fully submerged before it is connected
to the mains power and remains submerged
throughout the entire operation. This ensures
that the motor remains cool during use. DO NOT
run the pump when it is dry. Using the pump
above the water level may cause the motor to
overheat and damage the pump casing.
Ensure that the delivery hose is as straight as possible
and free from kinks, splits or obstructions. Where the
pump is used in a permanent or semi-permanent
installation, Draper Tools recommends installing a
non-return valve onto the delivery hose.
7.3 Positioning the Float Switch
The float switch (3) can be used to determine the water
levels at which the pump switches on and off when
connected to an active mains power supply. The switch
contains a bearing that activates the pump when it
moves to the cable entry point. As the water level drops,
the float switch tips downwards, causing the bearing to
roll away from the cable and break the circuit.
The float switch cable
MUST be anchored in the cable
clamp recess (1). The distance between the recess and
the float switch determines the volume of change in the
water level required to switch the pump on and off:
• A shorter distance between the float switch and the
cable clamp recess will reduce the change in depth
required to switch the pump on and off.
− The pump will switch on at a lower water level than
when the distance is longer.
− The pump will switch off at a higher water level
than when the distance is longer.
• A longer distance between the float switch and the
cable clamp recess will increase the change in depth
required to switch the pump on and off.
− The pump will switch on at a higher water level
than when the distance is shorter.
− The pump will switch off at a lower level than when
the distance is shorter.
3
Fig.
(3)
Pump off below this level
Pump on above this level
4
Fig.
(3)
Pump off below this level
Pump on above this level
To ensure that the pump switches off when the water
level reaches the top of the pump, anchor the float switch
with the shortest distance possible between the switch
and the clamp recess. However, the pump will switch on
at any time that the water level rises above the top of the
pump.
If a higher water level is permissible and a greater
distance between the float switch and cable clamp
recess is used, be aware that the pump will not switch off
automatically when the water level reaches the top of the
pump. In this case, the pump should be switched off
manually; see
8.1 Switching the Pump On and Off.
CAUTION! DO NOT allow the pump to operate if
the water level is lower than the rated minimum
water level.
Important: Draper Tools STRONGLY recommends that
the pump remains completely submerged throughout
the entire operation.
– 11 –
EN
