Preparation; Checking Of Liquid In Motor - Grundfos MS Montage- Und Betriebsanleitung

4. Preparation

Warning
Before starting work on the product,
switch off the power supply. Make sure
that the power supply cannot be
accidentally switched on.
Warning
To avoid personal injury when handling
the motor, use a strap or a lifting eye
and a crane for lifting.
Fig. 2 Handling of the motor

4.1 Checking of liquid in motor

The submersible motors are factory-filled with a
special FDA-approved, non-toxic liquid which is
frost-proof down to -20 °C.
The level of the liquid in the motor must
Note
be checked and the motor must be
refilled, if required. Use tap water.
If frost protection is required, a special
Grundfos liquid must be used to refill
Caution
the motor. Otherwise, tap water may be
used for refilling.
Refilling of liquid is carried out as described below.
4.1.1 Grundfos MS 402 and MS 4000 submersible
motors
The filling hole for motor liquid is placed in the
following positions:
MS 402: in the bottom of the motor.
MS 4000: in the top of the motor.
1. Position the submersible motor 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 before changing the position of the
motor.
Torques:
MS 402: 2.0 Nm.
MS 4000: 3.0 Nm.
The submersible motor is now ready for installation.
MS 4000
Fig. 3 Motor position during filling - MS 4000
and MS 402
4.1.2 Grundfos MS 6000 submersible motors
• If the motor is delivered from stock, the liquid
level must be checked before the motor is
installed. See fig. 4.
• In the case of service, the liquid level must be
checked. See fig. 4.
Filling procedure:
The filling hole for motor liquid is placed at the top of
the motor.
1. Position the submersible motor as shown in
fig. 4. 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. 4) until the liquid runs back out of the filling
hole.
4. Replace the screw in the filling hole and tighten
securely before changing the position of the
motor.
Torque: 3.0 Nm.
The submersible motor is now ready for installation.
Fig. 4 Motor position during filling - MS 6000
MS 402
45°
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