FULTON J Series, Installation, Operation And Maintenance Manual

Page: 48 / 72

JGASUK-IOMM-2015-2
Fulton Ltd
Page 42
MAINTENANCE - 4
Problem Cause Remedy
Pump runs
backwards when
switched off.
1. Leakage in suction pipe. Repair the suction pipe.
2. Foot or non-return valve is
defective.
Repair the foot or non-return valve.
Leakage in shaft seal.
1. Shaft seal is defective. Replace the shaft seal.
Noise.
1. Cavitation occurs in the
pump.
Check the suction conditions.
2. Pump does not rotate
freely (frictional resistance
because of incorrect pump
shaft position.
Adjust the pump shaft.
3. Frequency converter
operation.
See Grundfos manual.
4. Boiler feedwater non-return
valve letting water passed
the valve seat, (normally
accompanied by banging
in the feedwater tank).
Check and clean boiler feedwater non-return valve,
ensure it is seating and not allowing water passed.
Water pump will
not come on at
times.
1. Scale on probes. Check and clean probes, replace as
necessary.
2. Faulty pump contactor Check the contactor has power. Check the contactor
is pulling in.
Replace if necessary.
3. Faulty pump motor. Check the pump has power.
If the pump has power but is not running, replace it.
4. Faulty Level Control Relay Check the relay has power and is secure on it’s
base. Replace if faulty.
Low fuel pressure.
1. Gas pressure regulator Check and replace.
Boiler flooding
1. Pump does not shut off. Dirty probes. Clean or replace as necessary.
2. Relay failed. Ensure the relay is secure on its base.
If so replace the water level relay.
3. Earth connection. Clean and tighten as required.
4. Vacuum created with boiler
off.
As the boiler cools, it pulls water from the system
piping. To prevent this, add a check valve on the
steam gauge assembly piping, which closes under
pressure and opens under vacuum.
4.12.2 TROUBLESHOOTING FEEDWATER PUMP