Troubleshooting possible causes and remedies
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Installation and operating instructions Wilo NL-HE
37
6. Carefully insert the slide-in unit into the spiral housing (1.1) and tighten with the
hexagon head screws (14).
9.6.3
Screw tightening torques
A
A
A
C
C
A
C
B
Fig. 30:
Screw tightening torques
When tightening the screws, use the following tightening torques.
ƒ
A (pump)
Thread:
M8
M10
M12
M16
M20
M24
Tightening torque [Nm] 25
35
60
100
170
350
Table 10:
Screw tightening torque A (pump)
ƒ
B (coupling): Refer to tables for manufacturer specific tightening torques for adjusting
screws and coupling halves in chapter “Coupling alignment”.
ƒ
C (baseplate): Refer to table "Tightening torques for baseplate bolts (Grade 5, Zinc
Plated, Hex Bolts)" in chapter "Alignment of the pump unit".
10
Troubleshooting possible
causes and remedies
DANGER
Risk of death due to electrocution!
Improper conduct when carrying out electrical work can lead to death due to electric
shock! Electrical work must be carried out by a qualified electrician in accordance with
the locally applicable regulations.
WARNING
No persons are allowed to be present inside the working area of the pump!
Persons may suffer (serious) injuries while the pump is in operation! No persons may
therefore be present inside the working area. If persons must enter the working area of
the pump, the pump must be decommissioned and secured against being switched on
again without authorisation.
WARNING
Sharp edges on the impeller!
Sharp edges can form on the impeller. There is danger of limbs being severed! Protective
gloves must be worn to protect against cuts.
Further steps for troubleshooting
If the points listed here do not rectify the fault, contact customer service. Customer service
can assist in the following ways:
ƒ
Telephone or written support.
ƒ
On-site support.
ƒ
Inspection and repair at the factory.
Costs may be incurred if you request customer services! Please contact customer services
for more information.
