5 Operation.................................................................................................................................. 40
5.1 Precautions......................................................................................................................... 40
5.2 Estimate zinc anode replacement intervals....................................................................40
5.3 Start the pump....................................................................................................................41
6 Maintenance..............................................................................................................................42
6.1 Precautions......................................................................................................................... 42
6.2 Torque values.....................................................................................................................43
6.3 Change the oil....................................................................................................................43
6.4 Service the pump...............................................................................................................45
6.4.1 Inspection.................................................................................................................... 46
6.4.2 Overhaul...................................................................................................................... 47
6.4.3 Service in case of alarm..............................................................................................47
6.5 Replace the impeller......................................................................................................... 47
6.5.1 Replace the impeller: D............................................................................................. 48
6.5.2 Replace the F-impeller............................................................................................... 51
6.5.3 Replace the M-impeller..............................................................................................55
6.5.4 Replacing the N-impeller...........................................................................................58
6.5.5 Replacing the Adaptive N
™
impeller........................................................................62
7 Troubleshooting....................................................................................................................... 71
7.1 Electrical troubleshooting.................................................................................................71
7.2 The pump does not start...................................................................................................71
7.3 The pump does not stop when a level sensor is used.................................................. 72
7.4 The pump starts-stops-starts in rapid sequence............................................................73
7.5 The pump runs but the motor protection trips..............................................................73
7.6 The pump delivers too little or no water.........................................................................74
8 Technical Reference.................................................................................................................76
8.1 Application limits............................................................................................................... 76
8.2 Motor data.......................................................................................................................... 76
Table of Contents
2 Flygt 3127 Installation, Operation, and Maintenance Manual
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