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2.3 Sound pressure level
The sound pressure level has been measured in accordance with
the rules laid down in the EC machinery directive 98/37/EC.
Sound pressure level of pumps:
Applies to pumps submerged in water, without external regulating
valve.
Pump type
SP 55
SP 90
SP 270
SP 300
SP 360
Sound pressure level of motors:
The sound pressure level of Grundfos MS and MMS motors is
lower than 70 dB(A).
Other motor makes: See installation and operating instructions
for these motors.
3. Preparation
Before starting work on the pump, make sure that the
electricity supply has been switched off and that it
cannot be accidentally switched on.
3.1 Checking of liquid in motor
3.1.1 General
The submersible motors are factory-filled with a special non-poi-
sonous liquid, which is frost-proof down to –20°C.
Note: The level of the liquid in the motor must be checked and
the motor must be refilled, if required.
Note: If there is a risk of frost, special Grundfos liquid must be
used to refill the motor. Otherwise clean water may be used for
refilling (however, never use distilled water).
3.1.2 Refilling - Grundfos submersible motors MS 6000
•
If the motor is delivered from stock, the liquid level must be
checked before the motor is fitted to the pump, see fig. 3.
•
On pumps delivered directly from Grundfos, the liquid level
has already been checked.
•
In the case of service, the liquid level must be checked, see
fig. 3.
To refill the motor, proceed as follows:
The filling hole for motor liquid is placed at the top of the motor.
1. Position the submersible pump as shown in fig. 3. The filling
screw must be at the highest point of the motor.
2. Remove the screw from the filling hole.
3. Inject liquid into the motor with the filling syringe, fig. 3, until
the liquid runs back out of the filling hole.
4. Replace the screw in the filling hole and tighten securely be-
fore changing the position of the pump.
Torque: 3.0 Nm.
The submersible pump is now ready for installation.
Fig. 3
L
[dB(A)]
pA
71
71
77
77
77
3.1.3 Refilling - Grundfos submersible motors MMS 6000,
To refill the motor, proceed as follows:
1. Position the submersible pump as shown in fig. 4.
2. Remove the screw (A) from the filling hole and fit the nipple
3. Remove the air vent screw (B) to allow possible air in the mo-
4. Hold the funnel higher than the vent hole and pour clean water
5. Stop pouring water into the motor. Refit the screw (B) to the
The submersible pump is now ready for installation.
Fig. 4
3.2 Positional requirements
Depending on motor type, the pump can be installed either verti-
cally or horizontally. A complete list of motor types suitable for
horizontal installation is shown in section 3.2.1 .
If the pump is installed horizontally, the discharge port should
never fall below the horizontal plane, see fig. 5.
1
2
MMS 8000, MMS 10000 and MMS 12000
with pipe and funnel supplied with the motor.
tor to escape.
into the motor until the liquid starts dripping out of the motor.
vent hole and remove pipe and funnel. Replace the screw (A)
in the filling hole and tighten securely.
If the pump is to be installed in a position where it is
accessible, the coupling must be suitably isolated
from human touch. The pump can for instance be
built into a flow sleeve.
3
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