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9 Maintenance
Only allow qualified specialist staff to perform maintenance and repair work.
WARNING! Danger of electric shock.
Any danger from electrical current should be ruled out.
The pump should be electrically isolated and secured against unauthorised
switch-on during any maintenance or repair work.
Any damage to the connection cable should always be rectified by a qualified
electrician only.
WARNING! Danger due to strong magnetic field!
Inside the machine there is always a strong magnetic field that can cause injury
and damage to property in the event of incorrect dismantling.
• It is only permitted to have the rotor removed from the motor housing by
qualified personnel!
• If the unit consisting of impeller, bearing shield and rotor is pulled out of the
motor, persons with medical aids, such as cardiac pacemakers, insulin pumps,
hearing aids, implants or similar are at risk. Death, severe injury and damage to
property may be the result. For such persons, a professional medical assessment is
always necessary.
In assembled condition, the rotor's magnetic field is guided in the motor's iron
core. There is therefore no harmful magnetic field outside the machine.
After successful maintenance and repair work, install and connect the pump
according to the "Installation and electrical connection" chapter. Switch on the
pump according to the "Commissioning" chapter.
10 Incidents, causes and remedies
The pump should be electrically isolated and secured against unauthorised
switch-on during any repair work.
Incidents
Pump is not running
although the current
entry is switched on
Pump is making noises Cavitation due to insufficient
Building does not get
warm
28
Causes
Electrical fuse defective
Pump has no voltage
suction pressure
Thermal output of the heating
surfaces is too low
Remedies
Check fuses
Resolve the power interruption
Increase the system suction
pressure within the permissible
range.
Check the delivery head and set
it to a lower height if necessary.
Increase setpoint (cf. 8.3).
Switch off setback operation
(cf. 8.6).
Set control mode to Δp-c
(cf. 8.4).
05/2015
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