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3.3 - USE OF BY-PASS
The by-pass is a device to control the pump capacity and head, supplied upon request; it may be a knob or a lever, according to
models; by operating this device, the user can reduce the maximum capacity up to 50% and the maximum head up to 25%; during
the priming phase the by-pass must be closed (knob or lever completely rotated clockwise). The opening of by-pass greatly reduces
the priming capability.
4 - CAUTION
4.1 -TEMPERATURE OF THE ACCESSIBLE SURFACES
It depends on use conditions (head, type of liquid), on the room temperature, on the liquid temperature.
The outer surfaces of the electric motor, with the correct voltage, with the pump operating with clean cold water at half the
maximum head, can reach a temperature of about 30° C above ambient temperature; when the total temperature is above
50° C we recommend to wear protective gloves to handle these surfaces.
The outer surface of the pump body reaches the temperature of the pumped liquid; therefore it is necessary to wear gloves to hand-
le it when you pump hot or very cold liquids.
4.2 - RISKS DUE TO LIQUID JETS
An unwanted liquid jet may occur in the following cases:
- the pump is started without delivery pipe
- wrong assemblage of the fittings or absence of their gaskets
- faulty or unsuitable pipe
- deterioration of the seal and liquid jet between flange and pump body
- wrong assemblage or deterioration of the O-ring gasket between pump body and cover.
These events cause risks to the user when the liquid has a high temperature or when its contact with the human body must be avoi-
ded. In these cases the user must be very careful and, if necessary, install safeguards in suitable positions.
4.3 - RISKS OF INUNDATIONS
Damages caused by inundations due to failures of the pump must be avoided by the user using suitable preventive measures (for
example installation of alarms, stand-by pumps, ...)
5 - MAINTENANCE
5.1 - CLEANING
The pump can be easily cleaned pumping clean water; when the pump is used for hardly perishable food fluids (wine, vinegar) we
advise to wash it by pumping a suitable disinfectant solution (for example containing peracetic acid) then rinse it by pumping clean
water until the disinfectant solution has been eliminated. This procedure must be carried out before and after use. When the pump
is used with rapidly perishable food fluids (for example milk), washing must be frequently carried out by disassembling the pump and
cleaning carefully its parts following a procedure depending on the type of liquid.
5.2 - OPERATION FAULTS / TROUBLESHOOTING
F a u l t
The motor doesn't turn
The motor is fed correctly but it
doesn't turn
The direct current motor runs
irregularly or doesn't run
The pump doesn't suck
During operation with liquid the
pump produces an irregular noise
(like a rolling stone)
The pump doesn't suck or leaks
l i q u i d
The pump gurgles air in the
suction tank
Low or no capacity of liquid
Possible reason
Lack of power supply
Blocked impeller
Worn brushes
The suction height is excessive
The pump is not full of liquid
The suction pipe is not immersed in the
l i q u i d
The pump is not placed correctly
Suction of hard solid bodies
Break of parts of the impeller
The gaskets or the seal are damaged
Wrong pumping direction
Required head too high
The pump is clogged
Verify the power supply
Immediately stop the pump, disassemble it (see following
chapters), remove possible foreign bodies, restore the
correct position of the impeller and assemble
Replace the brushes (see chapter 5.6)
Check the suction height
Fill the pump with liquid
Immerse the suction pipe in the liquid
See installation instructions
Check that there are no infiltrations of air in the suction
pipe and fittings
Immediately stop the pump, disassemble and clean it (see
following chapters)
Immediately stop the pump, disassemble and clean it (see
following chapters), replace the impeller
Replace the gaskets and the seal (see following chapters)
Invert the pumping direction
Check the required head
Disassemble and clean the pump (see following chapters)
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