Grundfos ALPHA series User Manual

8
English (US)
7. Fault finding
Warning
Before starting any work on this circulator, make sure electrical supply has been
switched off and that it cannot be accidentally switched on.
Pump liquid may be scalding hot and under high pressure.
Fault Control panel Remedy
1. The pump does not run
LED off
Check power supply (voltage) and
circuit breaker.
Check zone control, voltage, control
options, and thermostat.
Check all power connections.
Damaged circulator / replace.
LED on
Check that the electricity supply falls
within the specified range.
Impeller blocked by impurities.
"
___ ___"
Requires turning power OFF and back
On to pump. Check for air, locked rotor
and/or voltage.
2. Noise in the system
LED on
Install air eliminator.
Reduce the pump speed.
Fluid velocities too high; reduce pump
speed.
Emitter or piping expanding.
3. Noise in the pump
LED on
Let the circulator run, will vent over time.
Increase the inlet pressure or check the
air volume in the expansion tank, if
installed.
No fluid (dry running).
Damaged circulator / replace.
4. Insufficient heat
LED on
Increase circulator speed or constant
pressure.
Circulator in proper operating mode.
Check for air, piping, zone(s) and
emitter(s).
Check thermostat(s).
Check all valving.
Heat emitter large enough.
Check direction of flow.
Check water temperature from boiler
and boiler functions.
Check proper sizing of circulator.
Check T calculation.

Grundfos ALPHA series Specifications

General

Brand	Grundfos
Model	ALPHA series
Category	Water Pump
Language	English