Flowserve NRG 16-11 User Manual download pdf (Page 18)

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 rods have earth contact.

Remedy: Check and change position of installation.

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 housing does not have earth connection to the boiler.

Remedy: Clean seating surfaces and insert metal joint ring (of stainless steel 1.4301) 27 x 32,

form D, DIN 7603, bright-annealed.

Do not insulate level electrode with hemp of PTFE tape.

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

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Should malfunctions occur during the commissioning procedure refer to chapter

“Operational Malfunctions” on page 18 in order to analyse and correct them.

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Flowserve NRG 16-11 User Manual Page 18