Flowserve NRS1-8 - Manual (Page 17)

7
Operational Malfunctions
Fault-finding list for troubleshooting malfunctions
Electrode exposed – high-level alarm
Fault: The level switch indicates a high-level alarm before the level in the boiler has reached
the high level mark.
Remedy: Check length of the high-level electrode tip. Check correct wiring of level switch and
electrode in accordance with wiring diagram, Fig. 10, Fig. 11.
Fault: After lowering the water level below the high-level mark, the two red LEDs
2
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 a measuring pot outside the boiler, check position of isolating
valves.
Fault: One or both red LEDs 2 light(s) up without the level having reached the high-level mark.
Remedy: This means electronic failure within the level switch, i. e. failure of one or two of the
channels. Replace level switch.
High-level reached – no function
Fault: The water level exceeds the high-level mark but neither of the two red LEDs 2 lights up.
Remedy: Check whether a vent hole has been provided in the protection tube. If the electrode is
fitted in a measuring pot outside the boiler, check position of isolating valves. Measure the
conductivity of the boiler water and compare the value obtained with the specification on
the name plate.
Fault: The testing with the switch "TEST II / INSPECTION" 1 was not successful, i. e. only one
red LED 2 or none of the two lighted up at the latest two minutes after the start of the test.
Remedy: Replace level switch.
Operation
Application in steam and (pressurized) hot water boilers in accordance with TRD 40, TRD 60, TRD 604,
EN 95, EN 953 or in accordance with national regulations.
Water-level alarm
Note
n For troubleshooting consult section “Operational Malfunctions” on page 7.
If faults occur that are not listed above, please contact our Technical Services or agency in your country.