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CONTENTS
1.
1.1
1.2
1.3
1.4
1.5
2.
3.
4.
4.1
4.2
4.3
4.4
4.5
4.6
4.7
4.8
5.
5.1
6.
7.
7.1
8.
8.1
8.2
8.3
8.4
9.
10.
Prior to installation, read these installation and
operating instructions. Installation and operation
must comply with local regulations and accepted
codes of good practice.
1. General description
This booklet includes instructions for installation, operation and
maintenance of Grundfos submersible wastewater pumps, type
SEN, fitted with motors of 1.0 to 21 kW.
The booklet also includes specific instructions for the explosion-
proof pumps.
1.1 Applications
The SEN pumps are designed for the pumping of wastewater in a
wide range of municipal, private and industrial applications in
aggressive environments.
Depending on version, the pumps can be used for submerged or
dry installation.
Maximum solids size: 80 mm or 100 mm.
1.1.1 Potentially explosive environments
In potentially explosive environments, the explosion-proof SEN
pumps must be used, see sections 1.5.1 Ex certification and clas-
sification and 8.3 Explosion-proof pumps.
Note: The explosion classification of the pump is EEx dIIB T3 or
EEx dIIB T4. The installation must in each individual case be
approved by the local fire-fighting authorities.
8
1.2 Operating conditions
Page
1.2.1 pH value
8
All pumps can be used for pumping liquids with a pH value
8
between 2 and 14.
8
1.2.2 Liquid temperature
8
0°C to +40°C.
9
10
1.2.3 Ambient temperature
10
-20°C to +40°C.
11
1.2.4 Density and viscosity of pumped liquid
11
Maximum density: 1000 kg/m³.
12
12
Maximum kinematic viscosity: 1 mm²/s (1 cSt).
12
Note: When pumping liquids with a density and/or a kinematic
12
viscosity higher than the values stated above, motors with corre-
13
spondingly higher outputs must be used.
13
1.2.5 Level of pumped liquid
13
In the case of submerged pump installation, the lowest stop level
13
must always be above the pump housing.
13
13
The pump must always be filled with the liquid to be
13
pumped.
14
An additional level switch must be installed to ensure
14
that the pump is stopped in case the stop level switch
14
is not operating.
15
To ensure adequate cooling of the motor during operation, the
15
following minimum requirements must be met:
16
•
Pumps without cooling jacket, motor sizes 1.0 to 4.5 kW,
16
and pumps with cooling jacket, motor sizes 5.5 to 21 kW:
17
No special requirements.
17
•
Pumps without cooling jacket, motor sizes 5.5 to 21 kW,
in submerged installation:
The pump must always be covered by the pumped liquid to the
middle of the motor.
1.2.6 Operating mode
The pumps are designed for continuous operation or for intermit-
tent operation with the maximum number of starts per hour stated
in the table below:
Motor size
5.5 - 21.0 kW
1.2.7 Enclosure class
IEC IP 68.
1.3 Sound pressure level
The sound pressure level of the pump is lower than the limiting
values stated in the EC Council Directive 98/37/EC relating to
machinery.
Starts per hour
25
20
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