Nilfisk-ALTO NEPTUNE 5 FA, Руководство по обслуживанию

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E
Troubleshooting
35 NEPTUNE 5 FA_EN_Ver.2.0_25/11
Boiler performance:
The symptom is reduced performance of the pump effect or the boiler effect. The symptom of redu-
ced boiler effect is a lower water outlet temperature than the set value. The possible causes for this
are as follows:
Scale deposits in boiler tube:
Scale formation acts as insulation and reduces heat transfer to the water. The result is raised flue
gastemperature = increased flue gas loss.
Cause: The hardness of the water
Remedy: Descale boiler tube.
Sooted boiler tube:
Soot has the same effect as scale deposits, i.e. that they are both insulating against the heat trans-
fer to the water and results in increased flue gas temperature = increased flue gas loss. Other symp-
toms are that the machine smokes during steady operation.
Cause 1: Air deficiency.
Remedy: Check air adjustment and fan attachment to boiler.
Cause 2: Bad oil/air mixture.
Remedy: Check oil pressure and oil quality. Replace the oil nozzle. Adjust air diffuser.
Cause 3: Unfinished combustion.
Remedy: Check bottom insulation, boiler top gasket between tube and inner boiler jacket in top co-
ver.
Check burner tube.
Cause 4: Unstable ignition.
Remedy: Check electrodes. Adjust the air quantity (less air).
Cause 5: Leaky solenoid valve on pump Y1.
Remedy: Check/replace solenoid valve Y1.
Low oil pressure
Cause 1: Incorrect adjustment.
Remedy: Adjust pump pressure (12 bar, see page 45).
Cause 2: Filter blocked, defective pump.
Remedy: Replace filter/pump. Empty and clean tank.
Full water quantity at steam stage
Cause: Mechanical defect of by-pass valve or adjustment.
Remedy: Check by-pass valve.