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3.2 Operating conditions
pH value
All pumps can be used for pumping liquids with a pH value
between 4 and 10.
SE/SL pumps in permanent installations can cope with the
following pH values:
Material versions S and Q: 4 to 10
Material versions R and D: 1 to 14
Liquid temperature
0 °C to +40 °C.
For short periods (max. 3 minutes), a temperature of up to +60 °C
is permissible.
Ambient temperature
The ambient temperature may exceed +40 °C for a short period
(max. 3 minutes).
Density and viscosity of pumped liquid
When pumping liquids with a density and/or a kinematic viscosity
higher than that of water, use motors with correspondingly higher
outputs.
Flow velocity
It is advisable to keep a minimum flow velocity to avoid
sedimentations in the piping system. Recommended flow
velocities:
• in vertical pipes: 1.0 m/s
• in horizontal pipes: 0.7 m/s
Installation depth
Maximum 20 metres below liquid level.
Maximum solids size
From 75 to 160 mm, depending on pump size.
3.2.1 Operating mode
The pumps are designed for continuous operation or for
intermittent operation with the maximum number of starts per
hour stated in the table below:
3.2.2 Enclosure class
IP68.
3.2.3 Level of pumped liquid
For a submerged pump, installation type C, the lowest stop level
must always be above the pump housing.
To ensure adequate cooling of the motor during operation, the
following minimum requirements must be met:
• Installation type S
For S1 operation (continuous operation), the pump must
always be covered by the pumped liquid to the top of the
motor. For S3 operation (intermittent operation), the pump
must always be covered by the pumped liquid to the middle of
the motor.
• Installation type C
The pump housing must always be covered by the pumped
liquid.
Fig. 1 Liquid level
• Installation types D and H
No special requirements.
3.3 Sound pressure level
3.4 Motor liquid
The motor is factory-filled with Grundfos motor liquid SML-3
which is frost-proof down to -20 °C. The motor liquid helps to
transfer the heat generated by the motor to the cooling chamber
and on to the pumped liquid passing through the pump.
SE/SL pump Starts per hour
9-30 kW 20
Warning
Dry-running is not allowed.
The level of pumped liquid must be controlled by
level switches connected to the motor control
circuit. The minimum level depends on the
installation type and is specified in these
installation and operating instructions.
Installation
type
Description Accessories
S
Sewage pump without
cooling jacket for submerged
installation on auto coupling.
Auto coupling
C
Sewage pump with cooling
jacket for submerged
installation on auto coupling.
Auto coupling
D
Sewage pump with cooling
jacket for dry vertical
installation.
Base stand
installation
Base plate
installation
H
Sewage pump with cooling
jacket for dry horizontal
installation.
Base stand for
horizontal
installation
TM05 2535 0212
Warning
Depending on the installation type, the sound
pressure level of the pump can be higher than
70 dB(A).
When working nearby such an installation in
operation, hearing protection must be used.
Liquid levels for installation
types S and C:
S1 operation and Ex
pumps, installation
type S
Installation type C
S3
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