Fault Finding The Product - Grundfos ALPHA2 Instrucciones De Instalación Y Funcionamiento

9. 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 be switched
on.
Fault Control panel
1. The pump Light field is off.
does not
run.
Light field is on.
___ ___
"
2. Noise in Light field is on.
the system
3. Noise in Light field is on.
the pump
a) The pump is not
connected to the
power supply.
b) The circuit breaker
has tripped.
c) The pump is
defective.
a) Supply voltage is too
high.
b) The rotor is blocked
by impurities.
" a) Supply voltage is too
low.
a) There is air in the
system.
b) The flow is too high.
c) Thermal expansion
of system
components.
a) There is air in the
pump.
b) The inlet pressure is
too low.
c) No liquid (dry
running).
d) The pump is
defective.
WARNING
Pressurized system
Death or serious personal injury.
- Before dismantling the pump, drain
the system or close the isolating
valve on either side of the pump
before the screws are removed. The
pumped liquid may be scalding hot
and under high pressure.
Remedy
Connect the pump to the power
supply.
Cut in the circuit breaker.
Replace the pump.
Check that the power supply falls
within the specified range.
Remove the impurities.
Switch the power off and on.
Check for air, locked rotor and/or
voltage.
Correct the power supply.
Install an air eliminator.
Reduce the pump speed.
Check the mounting brackets for
the pipes.
Secure loose mounting brackets.
Let the pump run, as it will vent
over time.
Install an air eliminator.
Increase the inlet pressure.
Check the air volume in the
expansion tank, if this is installed.
(Pressure leaks in the system can
lead to cavitation.)
Ensure the system has been filled
with liquid and vented.
Open the isolating valves.
Replace the pump.
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