English (GB)
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3. General description
3.1 Applications
Grundfos MS and MMS submersible motors are
designed according to market standards.
All Grundfos 4", 6" and 8" MS and MMS motors are
designed to fit pump ends manufactured according
to NEMA standards. The motors are ideally suited for
water supply pumps for irrigation, groundwater
regulation, pressure boosting, industrial water
transfer and similar applications.
3.2 Pumped liquids
The motors are suited for use in clean, thin, non-
flammable, non-combustible or non-explosive liquids
not containing solid particles or fibres.
The maximum sand content of the pumped liquid
must not exceed 50/100/150 g/m
3
.
The N, R and RE motor versions are designed for
liquids with higher aggressiveness than that of
drinking water.
Materials in contact with the liquid:
• MMS: cast iron DIN W.-Nr. 0.6025 and NBR
rubber.
• MMS -N: stainless steel DIN W.-Nr. 1.4401 and
NBR rubber.
• MS/MMS -R: stainless steel DIN W.-Nr. 1.4539
and NBR rubber.
• MS -RE: stainless steel DIN W.-Nr. 1.4539/
1.4517 and FKM rubber.
The maximum liquid temperature is listed in section
4.3 Liquid temperatures/cooling.
3.3 Sound pressure level
The sound pressure level has been measured in
accordance with the rules laid down in the EC
Machinery Directive 2006/42/EC.
The sound pressure level of Grundfos MS and MMS
motors is lower than 70 dB(A).
4. Installation requirements
Fig. 2 Handling of the motor
4.1 Checking the motor liquid
The submersible motors are factory-filled with a
special FDA-approved, non-toxic liquid which is
frost-proof down to -20 °C.
Refilling of liquid is carried out as described below.
DANGER
Electric shock
Death or serious personal injury
- Switch off the power supply before
starting any work on the product.
- Make sure that the power supply cannot
be accidentally switched on.
WARNING
Crushing of feet
Death or serious personal injury
- During handling, use lifting equipment
which is approved for the weight of the
product.
- Wear personal protective equipment
WARNING
Crushing of hands
Death or serious personal injury
- During handling, use lifting equipment
which is approved for the weight of the
product.
- Wear personal protective equipment
TM05 9648 4213
Check the level of motor liquid and refill if
required. Use tap water
If frost protection is required, a special
Grundfos liquid must be used to refill the
motor.
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