GESTRA NRG 16-11 - User Manual

Questions and Answers

S
steelekristinAug 3, 2025
What to do if LED alarm 1 or 2 and Diagnosis LED 3 are illuminated on GESTRA Switch?
- R
  Rachel RyanAug 3, 2025
  If the LED alarm 1 or 2 and Diagnosis LED 3 are illuminated on your GESTRA Switch, and pressing and holding down key 1 or 2 doesn't resolve the issue, it could be due to a malfunction in the processor or a stand-by fault. Refer to the operating instructions for the logic unit SRL and consider replacing the level switch. It could also indicate an internal voltage fault, in which case you should replace the level switch.
M
Megan WarnerAug 13, 2025
Why is the Diagnosis LED 3 flashing on my GESTRA Switch?
- J
  Jennifer ReynoldsAug 13, 2025
  If the Diagnosis LED 3 is flashing on your GESTRA Switch, it may be due to interference voltage causing a malfunction, or the boiler earth may be without PE. To resolve this, provide screen and earthing, and connect the boiler with PE.
W
wilsonrobertAug 22, 2025
What to do if LED alarm 1 and diagnosis LED 1 are illuminated on GESTRA Switch?
- P
  Phyllis ArnoldAug 23, 2025
  If LED alarm 1 and diagnosis LED 1 are illuminated on your GESTRA Switch, and pressing and holding down key 1 doesn't resolve the issue, it could indicate a malfunction in the level electrode or level switch, faulty wiring, or a faulty measuring voltage. Check the wiring, measure electrode voltages, clean and, if necessary, exchange the level electrode, and exchange the level switch.

Summary

Important Notes

Intended Use

Specifies how the level electrodes should be used for low-level limiting in steam boiler systems.

Safety Precautions

Stresses that installation and commissioning must be performed by qualified and competent personnel.

Operational Dangers

Warns about risks of severe scalding from steam/hot water and burns from hot equipment.

Nameplate Importance

Highlights that equipment must have its specific name plate to be commissioned or operated.

PED Compliance

Confirms the equipment fulfills requirements of the Pressure Equipment Directive (PED 97/23/EC).

ATEX Requirements

Details ATEX directive conditions for use in potentially explosive atmospheres, requiring Zener barriers.

Explanatory Notes

Scope of Delivery

Lists the components included in the supply for each NRG electrode model.

Product Overview

Explains the NRG level electrode's function in detecting minimum liquid levels in steam boilers.

Operating Principle

Describes the conductive measuring principle using water conductivity for level signaling.

Key System Components

Identifies the level switch NRS 1-7 as a crucial component for redundancy and self-checking.

Model Design Details

Outlines the screwed connections and electrical connection types for different NRG models.

Technical Data

Technical Data: NRG 16-11;17-11;19-11

Provides type approval, service pressure, connection, materials, and available lengths for these models.

Technical Data: NRG 111-11

Details type approval, service pressure, connection, materials, and available lengths for the NRG 111-11 model.

Nameplate Information

Explains the equipment designation and technical features indicated on the name plate.

Dimensions: NRG 16-11;17-11;19-11

Illustrates the physical dimensions and connection details for NRG 16-11, 17-11, and 19-11 models.

Dimensions: NRG 111-11

Presents the physical dimensions and connection details for the NRG 111-11 model.

Installation

Installation: Step 1

Covers initial steps involving screwing the electrode tip into the measuring electrode and determining length.

Installation: Step 2

Details checking seating surfaces, applying grease, and tightening the electrode into the flange.

Installation Precautions

Provides critical notes on machining, gaskets, bending, and spacing during installation.

Installation Guidelines

Offers important considerations for electrode installation in protection tubes, pots, and outdoor use.

Installation Tools

Lists the specific wrenches, scriber, and file required for installation tasks.

Electrical Connection

Electrical Connection: NRG 16-11;17-11;19-11

Explains the wiring procedure using a four-pole connector for these NRG models.

Electrical Connection: NRG 111-11

Details the terminal box connection for NRG 111-11 and optional use with aluminium terminal box.

Electrical Wiring Diagrams

Presents schematic diagrams illustrating the electrical connections between NRG electrodes and NRS 1-7.

Voltage Reference Table

Provides a table correlating voltage readings with electrode submersion status for diagnostics.

Electrical Connection Tools

Lists the specific screwdrivers and spanners needed for electrical connection work.

Commissioning

Commissioning: Wiring Check

Guides on verifying the correct wiring of the NRG electrode and NRS 1-7 controller.

Commissioning: Apply Power

Instructs on applying mains voltage to the level switch to commence the commissioning process.

Operation

Operation: Low-Level Limiter

Explains the function of the level limiter in conjunction with the NRS 1-7 controller in various plant types.

Operational Malfunctions

Fault Finding and Remedies

Offers a structured guide to identify common faults and their corresponding solutions for troubleshooting.

Decommissioning

Decommissioning Safety Warning

Warns about severe burns and scalds, emphasizing depressurizing and cooling before removal.

Product Disposal

Provides instructions for separating and disposing of the electrode and its electronic components according to regulations.

Annex

Conformity Declarations

Directs users to information regarding the equipment's conformity with European Directives and manufacturer declarations.

GESTRA NRG 16-11 Specifications

General

Brand	GESTRA
Model	NRG 16-11
Category	Accessories
Language	English

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