Wilo -Star-Z NOVA Installation And Operating Instructions Manual page 14

Maintenance/faults
Cleaning
Replacing the motor head
12
Clean the outside of the pump with a slightly
damp cloth only. Do not use detergents.
Warning: When removing the motor head
or pump, hot fluid may spurt out under high
pressure. Allow the pump to cool down before-
hand.
Close the stop valves before removing the pump
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Note: When the motor is removed and
running, noises and a change in rotation may
occur. This is normal for this situation.
Faultless operation can only be guaranteed
when the pump is operated in fluid.
Replacing the motor head
6 Maintenance/faults
Order the service motor from a specialist retailer.
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WILO SE 11/2011