Flowserve NRS1-9 - Manual (Page 13)

13
Annex
Fault finding list for troubleshooting
Fault: After raising the water level above the low-level mark, the red LEDs
are not extinguished or only after quite a considerable period.
Remedy: Check whether a vent hole has been provided in the protection tube. If the
electrode is fitted in an external chamber, check position of isolating
valves.
Fault: The switching controller signals high-level alarm before the level in the
boiler has reached the high level mark.
Remedy: Check length of high water level electrode tip. Check whether the
electrode tip has contact with the chamber/protection tube or other boiler
internals. Check correct wiring of level switch and electrode in accordance
with wiring diagram, fig. 1.
Fault: After decreasing the water level below the high-level mark, the red LED
is not extinguished or only extinguishes after quite a considerable period.
Remedy: Check whether a vent hole has been provided in the protection tube. If the
electrode is fitted in an external chamber, check position of isolating
valves.
If faults occur that are not listed above please contact our subsidiary or agency in
your country.
Fault: One or both red LED(s) light up without the level having fallen below
the low-level mark.
Remedy: This means electronic failure within the switching controller, i. e. failure of
one or both channels. Replace switching controller.
Fault: The switching controller signals low-level alarm before the level in the
boiler has fallen below the low level mark.
Remedy: Check length of low-water level electrode tip. Measure the conductivity of
the process or boiler water and compare the values obtained with the
marking on the name plate. Check correct wiring of switching controller
and electrode in accordance with wiring diagram, fig. 1.
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The terminal strip of the NRS 1-9 is live during operation. This presents
the danger of electric shock. Cut off power supply before fixing or
removing the housing cover.
Danger