Grundfos alpha2 l User Manual

English (GB)
16
12. Fault finding
Warning
Before starting work on the pump, switch off the
power supply. Make sure that the power supply
cannot be accidentally switched on.
Fault Control panel Cause Remedy
1. The pump does not
run.
Light off.
a) A fuse in the installation is blown. Replace the fuse.
b) The current-operated or voltage-
operated circuit breaker has tripped
out.
Cut in the circuit breaker.
c) The pump is defective. Replace the pump.
"POWER ON" is on only.
a) Power supply failure. The power
supply might be too low.
Check that the power supply falls within
the specified range.
b) The pump is blocked. Remove the impurities.
2. Noise in the system.
Shows normal operating
status.
a) Air in the system. Vent the system. See section 11. Pump
settings and pump performance.
b) The flow is too high. Reduce the suction head. See section
11. Pump settings and pump
performance.
3. Noise in the pump.
Shows normal operating
status.
a) Air in the pump. Let the pump run. It vents itself over
time. See section 10.2 Venting the
pump.
b) The inlet pressure is too low. Increase the inlet pressure or check the
air volume in the expansion tank, if
installed.
4. Insufficient heat.
Shows normal operating
status.
a) The pump performance is too low. Increase the suction head. See section
11. Pump settings and pump
performance.

Grundfos alpha2 l Specifications

General

Pump Type	Circulator Pump
Series	ALPHA2 L
Max Head	6 m
Voltage	230 V
Frequency	50/60 Hz
Temperature Range	2°C to 110°C
Material	Cast iron
Max Operating Pressure	10 bar
Installation Length	180 mm
Enclosure Class	IP42
Insulation Class	F
Weight	2.1 kg
Protection Class	Class I