Grundfos SL1 Series User Manual

English (GB)
34
* Applies only to pumps with sensor and with IO 113.
4. The pump operates at
below-standard
performance and
power consumption.
a) The impeller is blocked by
impurities.
Clean the impeller.
b) Wrong direction of rotation. Check the direction of rotation and
possibly interchange any two of the
phases in the incoming supply cable.
See section 9.3 Direction of rotation.
5. The pump operates,
but gives no liquid.
a) The outlet valve is closed or
blocked.
Check the outlet valve and possibly
open and/or clean it.
b) Non-return valve blocked. Clean the non-return valve.
c) Air in pump. Vent the pump.
6. High power
consumption (SLV).
a) Wrong direction of rotation. Check the direction of rotation and
possibly interchange any two of the
phases in the incoming supply cable.
See section 9.3 Direction of rotation.
b) The impeller is blocked by
impurities.
Clean the impeller.
7. Noisy operation and
excessive vibrations
(SL1).
a) Wrong direction of rotation. Check the direction of rotation and
possibly interchange any two of the
phases in the incoming supply cable.
See section 9.3 Direction of rotation.
b) The impeller is blocked by
impurities.
Clean the impeller.
8. The pump is clogged. a) The liquid contains large
particles.
Select a pump with a larger size of
passage.
b) A float layer has formed on the
surface of the liquid.
Install a mixer in the tank.
Fault Cause Remedy

Grundfos SL1 Series Specifications

General

Brand	Grundfos
Model	SL1 Series
Category	Water Pump
Language	English