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2.4 Motor cooling requirements
To ensure proper motor cooling, refer to the table be-
low for minimum flow requirements:
Flow velocity
past the motor
0.0 f/s
(free convection)
Min. 0.5 f/s
If the pump is to be installed horizontally, e.g. in a
tank, and there is a risk that the pump might be cov-
ered by mud, it must be installed in a flow sleeve.
2.5 Liquid temperatures/cooling
Figure 1 shows an SQ/SQE pump installed in a well.
With the pump operating, figure 1 illustrates the fol-
lowing:
• Well diameter
• Pump diameter
• Temperature of pumped liquid
• Flow past the motor to the pump suction strainer.
Note: The well diameter must be at least 3 inches.
If there is a risk that the motor will be covered with
sediment, it is recommended the pump be placed in a
flow sleeve. The motor should always be installed
above the well screen.
Liquid
temperature
Fig. 1 Pump installed in well
Maximum
liquid temperature
86°F (30°C)
104°F (40°C)
Well
diameter
Pump
diameter
2.6 Motor preparation
Grundfos MS 3 and MSE 3 submersible motors have
water-lubricated slide bearings. No additional lubrica-
tion is required.
The submersible motors are factory-filled with a spe-
cial Grundfos motor liquid, type SML 2, which will pro-
tect the motor liquid down to 4°F (–20°C) and prevent
the growth of bacteria. The level of motor liquid is im-
portant for the operating life of the bearings and con-
sequently the life of the motor.
2.7 Refilling of motor liquid
If for any reason the motor liquid has been drained or
lost, the motor must be refilled with Grundfos motor
liquid SML 2.
To refill the motor, proceed as follows:
1. Remove the cable guard and separate the pump
end from the motor.
2. Place the motor in vertical position with an incli-
nation of approximately 10°.
3. Remove the filling plug using a screwdriver or a
similar tool.
4. Inject motor liquid into the motor with a filling sy-
ringe or similar tool, see fig. 2.
5. To allow possible air to escape, move the motor
from side to side and turn the shaft.
6. Replace the filling plug and make sure it is tight.
7. Assemble pump end and motor.
8. Fit the cable guard.
The pump is now ready for installation.
10
Fig. 2 Injecting motor liquid
5
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