TapFlo CTV Series, Iom Manual

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2. OPERATION
IOM manual CTV vertical centrifugal pumps
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2. OPERATION
2.1. Start-up
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Check manually that the motor is free to turn, moving the motor cooling fan.
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Make sure that the piping is not clogged and is free from residues or foreign objects.
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The shut-off / regulation valve on the discharge side must be completely closed.
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The motor must turn in the same direction as the arrow shown on the pump. The
direction of rotation is always clockwise looking at the pump from the motor side; check
by starting briefly, then looking at the direction of rotation of the motor fan through the
fan lid. If it is wrong, the motor must be stopped immediately. Change the connection
to the terminals of the electric motor (chapter 1.9
Motor connection ) and repeat the
procedure described above.
NOTE! Perform this check when pump is dry in order to avoid pump damage in case of
wrong terminal connection.
➢
Any auxiliary connections must all be connected.
2.1.1. Starting the pump
Whenever starting the pump, make sure the pump casing is filled with liquid. See MIN start
level in chapter 1.7
Example of installation.
Start the electric motor and open the discharge shut-off / regulation valve gradually until the
desired output has been reached. The pump must not run two or three minutes with closed
discharge. Longer operation in these conditions can seriously damage the pump.
If the pressure shown on the pressure gauge on the discharge piping does not increase, turn
off the pump immediately and release pressure carefully. Repeat the connection procedure.
If there are changes of flow rate, head, density, temperature or viscosity of the liquid, stop
the pump and get in touch with our technical service.
During pump operation, make sure that the liquid level is within the permissible limits, see
levels H
min
and MIN in chapter 1.7 Example of installation.
2.1.2. Restarting after power shut-off
In case of accidental stopping, make sure that the non-return valve has prevented backflow
and check that the motor cooling fan has stopped. Start the pump again following the
instructions of chapter 2.1.1
Starting the pump
.
2.2. Stopping the pump
It is advisable to close the discharge shut-off / regulation valve gradually and stop the motor
immediately after. The reverse sequence is not recommended, especially with larger pumps
or longer delivery piping. That is to avoid any problems due to water hammering. If a suction
shutoff valve has been installed, it is advisable to close it completely.