Fault Cause and remedy
There is a leakage in the shaft seal.
The pump shaft position is incorrect.
The shaft seal is defective.
Noise.
The pump is cavitating.
The pump does not rotate freely (frictional resistance) because of
incorrect pump shaft position.
Frequency converter operation: See section Frequency converter
operation.
There is resonance in the installation.
There are foreign bodies in the pump.
The pump runs constantly (applies only to
pumps with automatic start/stop).
The stop pressure is too high in relation to the required quantity of
water.
The water consumption is larger than anticipated.
There is a leakage in the outlet pipe.
The direction of rotation of the pump is incorrect.
The pipes, valves or strainer are blocked by impurities.
The pump controller, if used, is defective.
The period of operation is too long (applies
only to pumps with automatic start/stop).
The stop pressure is too high in relation to the required quantity of
water.
The pipes, valves or strainer are blocked by impurities.
The pump is partly blocked or seized up.
The water consumption is larger than anticipated.
There is a leakage in the outlet pipe.
* In twin-head pump installations, the standby pump
will often rotate slowly.
9. Technical data
9.1 Operating conditions
9.1.1 Ambient temperature
Do not exceed the allowable maximum
ambient temperature stated on the motor
nameplate. If nothing is stated, the
allowable maximum ambient temperature
is 40 °C.
Maximum ambient temperature: 55 °C (131 °F).
9.1.2 Liquid temperature
Liquid temperature: -40 to +150 °C (-40 to +302 °F).
The maximum liquid temperature depends on the
mechanical shaft seal type and the pump type.
Depending on the cast-iron version and the pump
application, the maximum liquid temperature may be
limited by local regulations and laws.
The maximum liquid temperature is marked on the
pump nameplate.
If the pump is operating with liquids at high
temperatures, the life of the shaft seal may
be reduced. It may be necessary to
replace the shaft seal more often.
9.1.3 Maximum Operating pressure and test
pressure
Do not exceed the maximum operating
pressure sated on the pump nameplate.
The pressure test has been made with water
containing anticorrosive additives at a temperature of
20 °C (68 °F).
Pressure
stage
Operating
pressure
Test pressure
[bar] [MPa] [bar] [MPa]
PN 6 6 0.6 10 1.0
PN 6 / PN 10 10 1.0 15 1.5
PN 16 16 1.6 24 2.4
PN 25 25 2.5 38 3.8
The pumps comply with IEC 60335-2-51 if they are
used in closed heating or cooling systems.
The pumps comply with IEC 60335-2-51 If they are
used in service water applications and the maximum
allowable operating pressure stated on the pump
nameplate is equal to or higher than 1.0 MPa.
23
English (GB)
To Next Page
Loading...
Need help?
General
