Startup; Checking The Direction Of Rotation - Grundfos S1 Instrucciones De Instalación Y Funcionamiento

9. Startup

Warning
Before manual starting or changeover to
automatic control, make sure that no persons are
working on or near the pump.
Warning
Before the first start-up and after a long standstill
period, make sure that the pump has been filled
with pumped liquid.
In dry installed versions the cooling jacket must
always be filled with pumped liquid when
operating. Ensure this by venting before the first
start-up.
Proceed as follows:
1. Remove the fuses or switch off the mains switch.
2. Check the oil level in the oil chamber. See 10.1 Oil check and
oil change.
3. Check whether the impeller can rotate freely.
4. Check whether the monitoring units, if used, are operating
satisfactorily.
5. For pumps in submerged installation, make sure that the
pump is submerged in the liquid.
6. For pumps in dry installation, make sure that there is liquid in
the pit from which the supply of liquid comes.
Warning
Make sure that the pump has been filled with
pumped liquid.
Pumps in dry installation must be vented via the
vent hole in the pump housing.
7. Open the isolating valves, if fitted.
8. Check whether the system has been filled with liquid and
vented.
9. Check the setting of the level switches.
10. Start the pump and check the pump operation for abnormal
noise or vibrations.
In case of abnormal noise or vibrations from the
pump or other pump or liquid supply failures,
Caution
stop the pump immediately. Do not attempt to
restart the pump until the cause of the fault has
been found and the fault corrected.
11. After start-up, the actual pump duty point must be established
as accurately as possible so that it can be checked whether
the operating conditions are as desired.
The pump may only be started for a very short
Note
Note
period without being submerged for checking of
direction of rotation.
The operation of the pump should always take place in
accordance with established routines with scheduled checks of
pump monitoring equipment and accessories (valves, etc.).
Make sure that the pump and equipment settings cannot be
changed by unauthorized persons.
18

9.1 Checking the direction of rotation

An arrow cast in the pump housing indicates the correct direction
of rotation. The pump must rotate clockwise when seen from the
drive end. Observe the movement of the pump (jerk) when
started. If the pump jerks counter-clockwise, the direction of
rotation is correct.
As an alternative, the direction of rotation can be checked as
follows:
1. Start the pump and check the quantity of liquid or the
discharge pressure.
2. Stop the pump and interchange two of the phases to the
motor.
3. Restart the pump and check the quantity of liquid or the
discharge pressure.
4. Stop the pump.
5. Compare the results taken under points 1 and 3.
The connection which gives the larger quantity of liquid or the
higher pressure is the correct direction of rotation.
The pump must only run for a short period when
Caution
suspended from a chain.