Checking The Direction Of Rotation; Maintenance; Frost Protection; Cleaning - Grundfos CM Serie Instrucciones De Instalación Y Funcionamiento

8.3 Checking the direction of rotation

The description below applies to
Note
three-phase motors only.
The motor fan cover has an installation indicator.
See fig. 12. Based on the motor cooling air, it
indicates the direction of rotation of the motor.
Before the motor is started for the first time or if the
position of the indicator has been changed, the
indicator function should be checked, for instance by
moving the indicator field with a finger.
To determine whether the direction of rotation is
correct or wrong, compare the indication with the
table below.
Indicator field
Black
White/reflecting
* To reverse the direction of rotation, switch off the
power supply and interchange any two of the
incoming supply wires.
Indicator field
Fig. 12 Installation indicator
You can place the indicator in various positions on
the motor, but do not place it between the cooling
fins close to the screws that hold the fan cover.
The correct direction of rotation is also shown by
arrows on the motor fan cover.
12
Direction of rotation
Correct
Wrong*

9. Maintenance

Warning
Before starting work on the pump, switch
off the power supply. Make sure that the
power supply cannot be accidentally
switched on.
Warning
Make sure that the escaping water does
not cause injury to persons or damage to
the equipment.
The internal pump parts are maintenance-free. You
must keep the motor clean in order to ensure
adequate cooling of the motor. If the pump is
installed in dusty environments, clean and check the
pump regularly. Take the enclosure class of the
motor into account when cleaning.
The motor has maintenance-free, greased-for-life
bearings.

9.1 Frost protection

Pumps which are not being used during periods of
frost must be drained to avoid damage.
Remove the filling and drain plugs from the pump.
See fig. 10.
Do not refit the plugs until the pump is taken into
operation again.
Before startup after a period of inactivity,
the pump and the suction pipe must be
Caution
completely filled with liquid. See section
8. Startup.

9.2 Cleaning

Prior to a long period of inactivity, flush the pump
with clean water to prevent corrosion and deposits in
the pump.
Use acetic acid to remove possible lime deposits
from the pump.