Troubleshooting - KNF NF 60 Operating And Installation Instructions

Diaphragm liquid pump NF 60, NFB 60
Pump does not work
Cause
Pump not connected to mains
power supply.
Power supply is not switched
on.
Thermal switch or pump elec-
tronics have responded.
Connections or pipes are
blocked.
External valve is closed or filter
is blocked.
Diaphragm or valve plate or
seals are worn out.
Pump is not priming
Cause
Suction side of pump not con-
nected.
Liquid in the container is too
low.
Hose connections are not leak-
tight.
System valve is closed or filter
is blocked.
Pump head is filled with gas.
The system is unable to handle
the pressure on the pressure
side.
Particles in the pump.
The head parts are not media-
resistant.
KNF Flodos AG BA_NF60_EN_05_069208
Translated from the Original Operating and Installation Instructions
8.3. Replacing parts
Same procedure as in Section 8.2, "Cleaning", however, instead of
cleaning the resonating diaphragm (3), O-ring (4), connecting plate
(5), valve plate (6), intermediate plate (7), diaphragm (8), support
(9) and washer (10), replace them with new components.
9.

Troubleshooting

For pumps with alternating current motors:
Risk of electric shock, danger of death
➔ Before working on the pump disconnect the pump
from the power supply.
DANGER
➔ Ensure that the pump is de-energised.
Fault remedy
➔ Connect pump to mains supply.
➔ Switch on power supply.
➔ Disconnect pump from mains power supply.
➔ Allow pump to cool.
➔ Identify and eliminate cause of overheating/overload.
➔ Check pipes and connections.
➔ Remove blockage.
➔ Check external valves and filters.
➔ Replace diaphragm, valve plate and seals
(see Section 8.3).
Tab. 15
Fault remedy
➔ Connect the suction side of the pump.
➔ Fill container.
➔ Secure transition joints between hose and connections with
clamps or clamping elements.
➔ Open the valve.
➔ Clean filter.
➔ Reduce pressure on pressure side.
➔ Clean the pump head (see Section 8.2).
➔ Replace the pump head with a compatible version.
Troubleshooting
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