Flowserve NRS1-40.1 - Manual (Page 27)

27
Malfunctions
Fault finding list for level elec trode NRG 1.-40 / control unit NRS 1-40.1
Water level below switchpoint "Low water (LW)" - no low level alarm
Fault: LED "Power" and LEDs 1 - 4 are not illuminated.
Remedy: Apply mains voltage, wire equipment in accordance with wiring diagram.
Fault: The electrode rod(s) is/are too long.
Remedy: Cut electrode rod(s) to the length dictated by the switchpoint LW.
Fault: If the electrode is installed inside the boiler: The vent hole in the protection tube does not exist
or is obstructed.
Remedy: Check installation of level electrode. Make sure that the level in the protection tube corre-
sponds to the actual water level.
Water level not yet below switchpoint "Low water (LW)" - but a low level alarm is raised
Fault: The electrode rod(s) is/are too short.
Remedy: Replace electrode rod(s) and cut electrode rod(s) to the length dictated by the switchpoint LW.
Fault: The earth connection to the vessel is interrupted.
Remedy: Clean seating surfaces and screw in the electrode together with the supplied joint ring
∅ 27x32 DIN 7603. Do not insulate the electrode with hemp or PTFE tape!
Fault: The insulation of the level electrode is faulty.
Remedy: Replace level electrode.