FULTON RB Series Installation, Operation And Maintenance Manual page 57

Fulton Ltd
4.12.2 TROUBLESHOOTING
Problem
Pump runs
backwards when
switched off.
Leakage in shaft seal. 1. Shaft seal is defective.
Noise.
Water pump will
not come on at
times.
Low fuel pressure.
Boiler flooding
RB-RBC-IOMM-2015-1
Cause
1. Leakage in suction pipe.
2. Foot or non-return valve is
defective.
1. Cavitation occurs in the
pump.
2. Pump does not rotate
freely (frictional resistance
because of incorrect pump
shaft position.
3. Frequency converter
operation.
4. Boiler feedwater non-return
valve letting water passed
the valve seat, (normally
accompanied by banging
in the feedwater tank).
1. Scale on probes.
2. Faulty pump contactor
3. Faulty pump motor.
4. Faulty Level Control Relay
1. Gas pressure regulator
1. Pump does not shut off.
2. Relay failed.
3. Earth connection.
4. Vacuum created with boiler
off.
FEEDWATER PUMP
Remedy
Repair the suction pipe.
Repair the foot or non-return valve.
Replace the shaft seal.
Check the suction conditions.
Adjust the pump shaft.
See Grundfos manual.
Check and clean boiler feedwater non-return valve,
ensure it is seating and not allowing water passed.
Check and clean probes, replace as
necessary.
Check the contactor has power. Check the contactor
is pulling in.
Replace if necessary.
Check the pump has power.
If the pump has power but is not running, replace it.
Check the relay has power and is secure on it's
base. Replace if faulty.
Check and replace.
Dirty probes. Clean or replace as necessary.
Ensure the relay is secure on its base.
If so replace the water level relay.
Clean and tighten as required.
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.
MAINTENANCE - 4
Page 51