Grundfos ALPHA1 L Series User Manual

English (GB)
19
9.1 Deblocking the shaft
If the pump is blocked it is necessary to deblock the shaft. The
pump deblocking device is accessible from the front of the pump
without having to demount the control box. The force of the
device is high enough to deblock pumps, which are seized by
lime, for example if the pump has been turned off during summer.
Course of action:
1. Switch off the power supply.
2. Close the valves.
3. Locate the deblocking screw in the centre of the control box.
Use a star screwdriver with a size 2 Phillips tip to push the
deblocking screw inwards.
4. When the screw can be turned counterclockwise, the shaft
has been deblocked. Repeat step 3, if necessary.
5. Switch on the power supply.
Fig. 24 Deblocking the shaft
TM07 1414 0619
Before, during and after the deblocking, the device is
tight and must not release any water.
2
3
0/Off
1/On
1
No.2
5 mm

Grundfos ALPHA1 L Series Specifications

General

Pump Type	Circulator
Series	ALPHA1 L
Max Head	6 m
Voltage	230 V
Frequency	50/60 Hz
Liquid Temperature Range	2°C to 110°C
Max Operating Pressure	10 bar
Insulation Class	F
Enclosure Class	IP42
Application	Heating systems
Control Modes	Proportional pressure, constant pressure
EEI	0.20
Material	Cast iron
Power Input	Varies by model (e.g., ALPHA1 L 25-40 180: 3-22 W)
Pipe Connection	G 1 1/2