17
Operational Malfunctions
Fault-finding list for troubleshooting
Level electrode submerged – low-level alarm
Fault:
Mains voltage is not applied to level switch.
Remedy:
Apply mains voltage. Wire electrode according to wiring diagram.
Fault:
The electrode housing does not have earth connection to the boiler.
Remedy:
Clean seating surfaces and insert suitable metal joint ring.
Do
not
insulate level electrode with hemp of PTFE tape.
Fault:
The internal insulation of the electrode rod is damaged.
Remedy:
Replace level electrode.
Water level below low level limit – no function
Fault:
The electrode rods have earth contact.
Remedy:
Check and change position of installation.
Fault:
The vent hole in the protection tube does not exist, is obstructed or flooded.
Remedy:
Check protection tube and, if necessary, provide vent hole.
Fault:
The isolating valves of the external measuring pot (optional extra) are closed.
Remedy:
Open isolating valves.
If faults occur that are not listed above or cannot be corrected, please contact our Technical Service
or authorized agency in your country.
Operation
Operation in combination with controller NRS 1-7 in steam and pressurised hot water plants to
TRD 401, TRD 602, TRD 604, EN 12952, EN 12953 or other national regulations.
Low-level limiter
Note
■
Should malfunctions occur during the commissioning procedure refer to chapter
“Operational Malfunctions” on page 17 in order to analyse and correct them.
