Circor ALLWEILER NI Series User Manual

Troubleshooting
8 Troubleshooting
For faults which are not specified in the following table or can-
not be traced back to the specified causes, please consult the
manufacturer.
Possible faults are identified by a fault number in the table
below. This number identifies the respective cause and rem-
edy in the troubleshooting list.
Fault Number
Pump not pumping 1
Pumping rate insufficient
2
Pumping rate excessive 3
Pumping pressure insufficient
4
Pumping pressure excessive
5
Pump running roughly 6
Pump leaking
7
Motor power uptake excessive 8
Tab. 11 Fault number assignment
Fault number
12 34
5
6
7
8
Cause
Remedy
X
––– ––––
Supply/suction pipe and/or pressure pipe
closed by armature
Open the armature.
–
X
–
X
––––
Supply/suction pipe not fully opened
Open the armature.
XX
–– –
X
––
Stub shaft loose
Tighten the stub shaft firmly
(→ 7.4 Installing, Page 25).
XX
–
X
–
X
––
Supply/suction pipe, pump or suction
strainer blocked or encrusted
Clean the supply/suction pipe, pump or
suction strainer.
–
X
–
X
–
X
––
Supply/suction pipe cross-section too
narrow
Increase the cross-section.
Remove any encrustations from the
suction pipe.
Open the armature completely.
X
––– ––––
Transport and sealing cover still in place Remove the transport and sealing cover.
Dismount the pump and inspect it for
dry-running damage.
–
X
–
X
–
X
––
Differential head excessive:
NPSH
pump
larger than NPSH
system
Increase the supply pressure.
Consult the manufacturer.
X
––– –
X
––
Supply/suction pipe not bled properly or not
filledupcompletely
Fill up the pump and/or piping completely
and bleed them.
X
––– –
X
––
Supply/suction pipe contains air pockets
Install the armature for bleeding.
Correct the piping layout.
XX
–
X
–
X
––
Air is sucked in
Seal the source of malfunction.
XX
–
X
–
X
––
Excessive amount of gas: pump is
cavitating
Consult the manufacturer.
–
X
–
X
–
X
––
Pumped medium temperature too high:
pump is cavitating
Increase the supply pressure.
Lower the temperature.
Consult the manufacturer.
550 113 – 146-900/E BA-2021.06 en-US NI series 27

Circor ALLWEILER NI Series Specifications

General

Brand	Circor
Model	ALLWEILER NI Series
Category	Water Pump
Language	English