Startup; Direction Of Rotation; Maintenance And Service - Grundfos DW series Montage- Und Betriebsanleitung

7. Startup

When the electrical connection has been carried out,
the pump is ready for operation.
Submerge the pump into the liquid to be pumped and
start it.
The valve for the level control system will
automatically vent the pump. Therefore, there will be
no problems with air in the pump.

7.1 Direction of rotation

All single-phase pumps are factory-set to the
correct direction of rotation.
Before starting up three-phase pumps, check the
direction of rotation. The direction of rotation should
be clockwise.
When starting up, the pump will jerk in the opposite
direction to the direction of rotation (the arrow on the
top cover indicates the direction of the jerk). If the
direction of rotation is wrong, interchange two of the
three phases of the electricity supply.

8. Maintenance and service

Warning
Before starting work on the pump, make
sure that the electricity supply has been
switched off and that it cannot be
accidentally switched on. Furthermore,
all rotating parts must have stopped
moving.
Before carrying out maintenance and service, make
sure that the pump has been thoroughly flushed with
clean water. Rinse the pump parts in water after
dismantling.
Warning
When unscrewing the inspection screw of
the oil chamber, please note that
pressure may have built up in the
chamber. Do not remove the screw until
the pressure has been fully relieved.
Pumps running normal operation should be
inspected at least once a year. If the pumped liquid is
very muddy or sandy, inspect the pump at shorter
intervals.
When the pump is new or after replacement of the
shaft seals, check the oil level after one week of
operation.
8
For long and trouble-free operation of the pump the
following points should be checked regularly:
• Power consumption
• Oil level and oil condition
The oil becomes greyish white like milk if it
contains water. This may be the result of a
defective shaft seal. The oil should be replaced
after 3000 hours of operation (DW.50.08, 1000
hours).
Use Shell Ondina X420.
Note: Used oil must be disposed of in
accordance with local regulations.
The following table states how much oil the DW
pumps must have in the oil chamber:
Pump type Voltage
Single-phase
DW.50.07.1 1 x 230 V
DW.50.07.A1 1 x 230 V
DW.50.08.1 1 x 230 V
DW.50.08.A1 1 x 230 V
Three-phase
DW.50.08.3 3 x 400 V
DW.50.08.A3 3 x 400 V
DW.50.09.3 3 x 400 V
DW.50.09.A3 3 x 400 V
DW.65.27 3 x 400 V
DW.65.27.A 3 x 400 V
DW.65.39 3 x 400 V
DW.65.39.A 3 x 400 V
DW.100.66.H 3 x 400 V
DW.100.66.AH 3 x 400 V
DW.100.39 3 x 400 V
DW.100.39.A 3 x 400 V
DW.100.66 3 x 400 V
DW.100.66.A 3 x 400 V
DW.100.110.H 3 x 400 V
DW.100.110.AH 3 x 400 V
DW.150.110 3 x 400 V
DW.150.110.A 3 x 400 V
DW.100.200.H 3 x 400 V
DW.100.200.AH 3 x 400 V
DW.150.200 3 x 400 V
DW.150.200.A 3 x 400 V
* Filled with grease (Klüber Synteso Proba 330).
Quantity of oil
[l]
0.25
0.25
*
*
*
*
0.25
0.25
0.3
0.3
0.3
0.3
0.3
0.3
0.3
0.3
0.3
0.3
2.3
2.3
2.3
2.3
2.3
2.3
2.3
2.3