2 English 5.906-472.0 Rev. 00 (08/08)Contents1 Preface 32 Safety instructions 32.1 Hazard levels 33 Technical Features 33.1 Proper use 33.2 General 33.3 Filter and vacuum system 33.4 Electrical system 34 Parts of the system 44.1 View of NT 27/1 44.2 View of NT 48/1 54.3 Suction head removed 64.4 Dirt water drain hose on the NT 48/1 65 Basic settings and service procedures 75.1 Remove cartridge filter 75.2 Replace seal 75.3 Remove the swimmer 75.4 Separate the suction turbine casing from the suction head casing 85.5 Replace appliance switch 85.6 Replacing the suction turbine 95.7 Replacing the abrasive coals of the suction turbine 116 Circuit diagram 126.1 Circuit diagram 0.088-563.0 127 Troubleshooting 138 Specifications 139 Special tools 13