GESTRA NRGS 15-1 User manual
Original Installation &
Operating Manual
850690-00
Level Switch
NRGS 15-1
EN (USA)
English
2NRGS 15-1 - USA - Installation & Operating Manual - 850690-00
Contents
Content of this Manual......................................................................................................................... 4
Scope of supply, product package....................................................................................................... 4
How to use this Manual........................................................................................................................ 5
Illustrations and symbols used............................................................................................................ 5
Hazard symbols in this Manual............................................................................................................ 5
Types of warning .................................................................................................................................. 6
Specialist terms, abbreviations ........................................................................................................... 7
Usage for the intended purpose........................................................................................................... 8
Applicable directives and standards.............................................................................................. 8
Improper use ........................................................................................................................................ 8
Basic safety information ...................................................................................................................... 9
Required personnel qualifications..................................................................................................... 10
Notes on product liability................................................................................................................... 10
Function .............................................................................................................................................. 11
Technical data .................................................................................................................................... 12
Rating plate, identification................................................................................................................. 14
Overall view of the NRGS 15-1 ........................................................................................................... 15
Dimensions of the NRGS 15-1............................................................................................................ 16
Setting functions ................................................................................................................................ 17
Selecting a function ....................................................................................................................... 17
Setting functions............................................................................................................................ 19
Setting the time delay.................................................................................................................... 19
Setting the response sensitivity...................................................................................................... 20
Preparing for installation ................................................................................................................... 21
Installation.......................................................................................................................................... 22
Installing the NRGS 15-1, step 1 .................................................................................................... 24
Functions table .............................................................................................................................. 24
Installing the NRGS 15-1, step 2 .................................................................................................... 25
Installation examples with dimensions............................................................................................. 26
Electrical connection.......................................................................................................................... 28
Rotating the terminal box............................................................................................................... 28
Connecting the NRGS 15-1 level switch......................................................................................... 28
Wiring diagram .............................................................................................................................. 29
3NRGS 15-1 - USA - Installation & Operating Manual - 850690-00
Contents
Bringing into service .......................................................................................................................... 30
Checking the electrical connection................................................................................................. 30
Switching on the power supply ...................................................................................................... 30
Checking switchpoints and functions ............................................................................................. 30
Fault indications and troubleshooting............................................................................................... 31
Indications, diagnosis and corrective action ................................................................................... 31
Replacing the electronic circuit board ............................................................................................ 34
Taking out of service.......................................................................................................................... 35
Removing the level switch ............................................................................................................. 35
Disposal .............................................................................................................................................. 36
Returning decontaminated equipment.............................................................................................. 36
UL components................................................................................................................................... 36
Annex .................................................................................................................................................. 37
Setting other functions................................................................................................................... 37
Installation in non-metallic tanks ................................................................................................... 37
4NRGS 15-1 - USA - Installation & Operating Manual - 850690-00
Content of this Manual
Product:
■ Level switch NRGS 15-1
First edition:
BAN 850690-00/08-2021cm
© Copyright
All rights reserved. Any misuse, particularly reproduction and dissemination to third parties, is not
permitted. The General Terms & Conditions of GESTRA AG apply.
Scope of delivery, product package
■ 1 x NRGS 15-1 level switch, comprising
■ 1 x level electrode with four tips
■ 1 x terminal box with level switch
■ 1 x Installation & Operating Manual
5NRGS 15-1 - USA - Installation & Operating Manual - 850690-00
How to use this Manual
This Installation & Operating Manual describes the correct use of the NRGS 15-1 level switch. It
applies to persons who integrate this equipment in control systems, install, bring into service, op-
erate, maintain and dispose of this equipment. Anyone carrying out the above-mentioned activities
must have read this Installation & Operating Manual and understood its contents.
■ Read this Manual in full and follow all instructions.
■ Please also read the instructions for use of any accessories.
■ The Installation & Operating Manual is part of the product package. Keep it in an easily acces-
sible location.
Availability of this Installation & Operating Manual
■ Make sure this Installation & Operating Manual is always available to the operator.
■ If you pass on or sell the equipment to a third party, please also hand over the Installation &
Operating Manual.
Hazard symbols in this Manual
Danger zone, dangerous situation
Illustrations and symbols used
1. Action to be taken
2.
■ Lists
◆ Bullet points in lists
A Keys to illustrations
Additional
information
Read the relevant
Installation & Operating Manual
6NRGS 15-1 - USA - Installation & Operating Manual - 850690-00
Types of warning
DANGER
Warning of a dangerous situation that results in death or serious injury.
WARNING
Warning of a dangerous situation that may possibly result in death or serious injury.
CAUTION
Warning of a situation that may result in minor or moderate injury.
ATTENTION
Warning of a situation that results in damage to property or the environment.
7NRGS 15-1 - USA - Installation & Operating Manual - 850690-00
Specialist terms, abbreviations
Here, we explain some abbreviations, specialist terms, etc., which are used in this Manual.
NRGT .. / NRR.. / NRS.. / URS .. / URB .. / SRL .. / etc.
Equipment and type designations of GESTRA AG.
SELV
Safety Extra Low Voltage
Operating point (of the plant)
The operating point describes the operating parameters within which a plant or boiler is operated
in its nominal range. In a steam boiler, for example, these parameters would be
output, pressure, and temperature.
The design data may be a lot more stringent, however.
A boiler that is operated at 145psi (10bar) and 356°F (180°C) may be designed to withstand a
pressure of 870psi (60bar) and a temperature of 527°F (275°C), for example, which is therefore
not necessarily its operating point.
8NRGS 15-1 - USA - Installation & Operating Manual - 850690-00
Usage for the intended purpose
The NRGS 15-1 level switch indicates when four different water levels have been reached, and
acts as a water level controller with MIN and MAX alarm, e.g. in steam boilers and hot water
installations and also in condensate and feedwater tanks. The NRGS 15-1 is classified as an
operating control in accordance with UL60730-1.
Improper use
There is a danger of death due to explosion if the equipment is used in potentially
explosive atmospheres.
Do not use the equipment in potentially explosive atmospheres.
Do not bring any equipment into service that does not have its own specific rating
plate.
The rating plate indicates the technical features of the equipment.
Applicable directives and standards
The NRGS 15-1 level switch has been tested and approved for use in the scope governed by the
following directives and standards:
Standards:
■ UL 60730-1 and CAN/CSA E60730-1
General Requirements for Automatic Electrical Controls
■ UL 60730-2-15 and CAN/CSA E60730-2-15
Requirements for Automatic Electrical Water Level Sensing Controls
9NRGS 15-1 - USA - Installation & Operating Manual - 850690-00
Danger to life from scalding! Do not remove the level electrode under
pressure. Steam or hot water can spurt forcefully out of the equipment.
■ Only remove the level electrode at 0psi (0bar) boiler pressure.
Risk of severe burns! Do not perform work on a level electrode that is still hot. The
level electrode gets very hot during operation.
■ Allow the level electrode to cool.
■ Always wait for the level electrode to cool before performing any installation and
maintenance work.
Danger to life from electric shock during work on electrical systems.
■ Always switch off the voltage to the plant before performing connection work.
■ Check that the plant is not carrying live voltage before commencing work.
Danger to life! Hot steam or hot water can suddenly escape from a faulty
NRGS 15-1 level switch.
Shocks and impacts during transport or installation can result in damage to or leaks in
the level electrode, causing pressurized hot steam or hot water to escape through the
pressure relief hole.
■ To prevent damage during transport and installation, do not expose the electrode
rod to major shocks or impacts.
■ Before and after installation, check that the level electrode is completely undamaged.
■ Check that the level electrode is not leaking when bringing into service.
Attempts to repair the equipment will cause the plant to become unsafe.
■ The NRGS 15-1 level switch may only be repaired by the manufacturer, GESTRA AG.
■ Only replace faulty equipment with identical equipment from GESTRA AG.
Basic safety information
10 NRGS 15-1 - USA - Installation & Operating Manual - 850690-00
Required personnel qualifications
Activity Personnel
Integration in control system Specialist staff Plant designer
Installation/electrical
connection/
bringing into service
Specialist staff
The equipment may only be installed, wired
and brought into service by qualified and
competent staff.
Operation Boiler service technician Staff trained by the plant operator.
Maintenance work Specialist staff
Maintenance and refits may only be
performed by authorized staff who have
undergone specific training.
Refits Specialist staff Persons trained by the plant operator to work
with pressure and temperature.
Notes on product liability
The manufacturer cannot accept any liability for damages resulting from improper use of the
equipment.
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