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Idiomas disponibles
Idiomas disponibles
OPERATING AND MAINTENANCE MANUAL
CENTRIFUGAL ELECTRIC PUMP CH SERIES
The delivery pipe must be fitted with a check valve (to protect the pump from water
hammer and to prevent the backflow of liquid from the pipe through the impeller)
and a flow regulator gate valve downstream from the check valve in order to regulate
the flow, the
head and the power of the pump. (See Fig.3) In the case of self-priming electric
pumps for high priming-suction heights, (greater than 5 m but anyway less than 9 m)
the delivery pipe must have a straight and vertical section at least 1 m long.
10.
ELECTRICAL CONNECTION
For all the pumps, the electrical power cables must be sized according to their length
and the current indicated on the pump data plate. Prepare the ends of the power and
ground conductors so that the conductors cannot slip off during installation when
the corresponding terminal block nuts and the ground screw are tightened. The elec-
trical connection must anyway be carried out by qualified personnel, in compliance
with the current regulations in the country in which the equipment is used.
Make sure that the voltage / frequency of the mains power supply is the same as
the one indicated on the data plate of the electric pump: then connect the terminals
following the diagrams shown in Fig. 8 and / or located inside the terminal box cover.
Earth the electric pump using the specific terminal. Make sure that the mains power
supply is properly earthed and that therefore the electric pump is earthed.
Some models of single-phase electric pumps, fitted with motor protectors, could
restart without warning if the motor protector tripped due to overheating: disconnect
the power supply before carrying out any work on the electric pump. Both threepha-
se and single-phase electric pumps must anyway be permanently connected to
the mains power supply and a suitable protection device installed (suitably rated
thermal magnetic circuit breaker incorporated in the fixed wiring) that ensures an all
pole disconnection of the mains power supply. The maximum permissible tolerance
between the actual electrical supply voltage and the nominal value indicated on the
data plate of the electric pump is ± 10% for three-phase electric pumps and ± 6% for
single-phase electric pumps.
11.
START-UP AND OPERATION
Make sure that the motor shaft is free to rotate before starting the machine. The
smaller electric pumps have a slot for inserting a screwdriver at the end of the shaft
on the fan side for doing this; if the shaft does not move, lightly tap the screwdriver
with a plastic headed hammer. (Fig.6) Fill the pump body and suction pipe comple-
tely with liquid through the appropriate hole (Fig.1) [for the vertical ULTRA models,
loosen the vent "a" (at the top) to let the air out and loosen the needle by-pass valve
"b" on the drain plug (at the bottom). Once completed, close the by-pass needle valve
and the vent without using excessive force]. Do not under any circumstances operate
the pump when it is dry. All the machines, apart from ULTRA series 18 machines,
should rotate clockwise (when seen from the fan side).
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