FRANCO NEBBIA Serie Manual página 47

DEFECT
Operating pressure too high Nozzles plugged
(the pressure can be detected
on a pressure gauge built into
the pump).
Too few nozzles
Operating pressure too low Too many nozzles
(the pressure can be detected
on a pressure gauge built into
the pump)
Pressure switch timer adjustment The nebulization group has a built-in timer which, after a delay of about 6 seconds, enables the
Pump is drawing air
High pressure hose rupture
Nozzles broken and/or missing
End-of-line valves defective
Kinks in the system
By-pass
adjusted
Pump by-pass valve dirty or worn
Vibrations and/or irregular Pump is drawing air
water output
Pump cavitation
Air in the hoses
Pump seals worn
Delivery
blocked
Pump very hot Pump running partially dry
By-pass level too high
Pump noisy Bearings worn
Pump oil emulsified Water leaking into the oil system
(emulsion)
Dripping from pump head Seals and/or pistons worn
L-LC191.01.FN
POSSIBLE CAUSES
This is typical when the water is very hard or when the system is started up again after a long down
time. Water inside the system evaporates leaving a sediment that jeopardises proper nozzle
operation. To prevent/reduce the problem, we recommend installing an HP valve at each end of
the line. The first time the system is turned on, unscrew the valves so that any water remaining in
the system and any mineral/scale deposits that could plug the nozzles can be eliminated. If the
nozzles are already plugged, dismantle them completely and soak them in an acid solution (e.g.:
water + vinegar) for about 24 hours. Then, blow out the nozzles with compressed air.
Each machine is dimensioned to handle a minimum and maximum number of nozzles. Check
number of nozzles recommended for the specific machine
If the total flow rate for the nozzles installed exceeds the pump flow rate, the machine will not be
able to supply the correct operating pressure. Therefore, after a few seconds, it cuts out. Make
certain that the nebulization group model is suitable for the number of nozzles installed. If
necessary, reduce the number of nozzles and try start-up once more.
pressure switch to control the pressure of the water exiting the machine. If the water pressure has
not reached the minimum value of 25 bar within this delay, the pressure switch trips and stops the
machine. This situation occurs when the total flow rate for the nozzles installed exceeds the pump
flow rate and thus the machine cannot achieve the correct operating pressure within the expected
time. Read section 4.8 carefully before making this adjustment.
Check supply fittings
Replace the high-pressure hose
Make certain that all nozzles are present and functioning properly.
Check that the end-of-line valves are present and functioning properly; i.e., in closed position
during machine operation.
Tubing with a diameter of not less than ½" must be used for low pressure water mains. Tubing
with a diameter of not less than DN5 (3/16") must be used for high pressure water mains.
valve not properly Contact a service centre
Contact a service centre
Check supply fittings
This is a typical problem that occurs when the flow rate and/or pressure of the incoming water is
too low to meet the machine requirements.
Drain any air bubbles by disconnecting the high pressure hose
Contact a service centre
and suction valves Check that the suction/delivery valves are clean (see section 8.5). Unscrew valve caps, withdraw
and clean them. If possible, have this task performed by a service centre.
Depending on the model used, check that the water inflow is sufficient for operation. See table for
the water mains given in section 6.3.2
An overly high by-pass level causes the water circulating in the pump to heat up which, in turn,
causes the pump itself to heat. The safety valve (red) on the pump, should release a part of the
water when a temperature of 63⁰C is exceeded. The by-pass level must be reduced by increasing
the number of nozzles on the line.
Contact a service centre
Request the seal replacement kit from the service centre
Request the seal replacement kit from the service centre
EN
REMEDY
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