Grundfos ALPHA 26-99 User Manual

14
English (US)
7. Fault finding the product
DANGER
Electric shock
Death or serious personal injury
- Switch off the power supply before
starting any work on the product.
Make sure that the power supply
cannot be accidentally switched on.
- Be aware that capacitors will be
live up to 30 seconds after the
power supply has been switched
off.
Before dismantling the circulator,
drain the system, or close the
isolating valves on either side of the
circulator.
CAUTION
Hot liquid
Minor or moderate personal injury
- The pumped liquid may be scalding
hot.
CAUTION
Pressurized system
Minor or moderate personal injury
- The pumped liquid may be under
high pressure.
Fault Power supply Cause Remedy
1. The pump does
not run.
No power supply. a) The system is
switched off.
Check the system
controller.
b) One fuse in the
installation is
blown.
Replace the fuse.
c) The current-
operated or
voltage-operated
circuit breaker has
tripped.
Cut in the circuit
breaker.
d) Power supply
failure.
Check that the power
supply falls within the
specified range.
Normal power supply. a) The controller has
switched off.
Check the controller
and its settings.
b) The pump is
blocked by
impurities.
Remove the impurities.
c) The pump is
defective.
Replace the pump.
2. The pump cannot
be controlled and
only runs at
maximum speed.
Normal power supply. a) No signal through
the signal cable.
Check if the cable is
connected to the
controller. If yes,
replace the cable.
3. Noise in the
system.
Normal power supply. a) Air in the system. Vent the system.
b) The outlet
pressure is too
high.
Reduce the setting of
the controller or the
valve.
4. Noise in the pump. Normal power supply. a) Air in the pump. Let the pump run. The
pump vents itself over
time.
b) The inlet pressure
is too low.
Increase the inlet
pressure or check the
air volume in the
expansion tank, if
installed.
5. Insufficient flow. Normal power supply. a) The pump
performance is too
low.
Check the controller
and its settings.
b) The hydraulic
system is closed
or the system
pressure is
insufficient.
Check the check valve
and filter. Increase the
system pressure.

Grundfos ALPHA 26-99 Specifications

General

Model	ALPHA 26-99
Category	Water Pump
Max Operating Pressure	10 bar
Type	Circulation Pump
Voltage	230 V
Frequency	50 Hz
Operating Temperature Range	2°C to 110°C