GESTRA Spector Compact Series Manuale utente
1
EN
English
Original Installation Instructions
810366-05
Compact System
NRGS 11-2
NRGS 16-2
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Contents
Usage for the intended purpose ..............................................................................................................4
Safety note .............................................................................................................................................4
LV (Low Voltage) Directive and EMC (Electromagnetic Compatibility) .......................................................4
ATEX (Atmosphère Explosible).................................................................................................................4
Note on the Declaration of Conformity / Declaration by the Manufacturer ..........................................4
Important Notes
Page
Explanatory Notes
Scope of supply......................................................................................................................................5
Function .................................................................................................................................................5
NRGS 11-2, NRGS 16-2 ........................................................................................................................13
Table “Functions” .................................................................................................................................13
Tools.....................................................................................................................................................14
Examples of installation ........................................................................................................................15
Key.......................................................................................................................................................16
Installation
NRGS 11-2, NRGS 16-2 .................................................................................................................... 6 - 7
Name plate / marking .............................................................................................................................8
Dimensions.............................................................................................................................................9
Technical data
NRGS 11-2, NRGS 16-2 ........................................................................................................................10
Key.......................................................................................................................................................12
Design
NRGS 11-2, NRGS 16-2 ........................................................................................................................11
Key.......................................................................................................................................................12
Functional Elements
3
Electrical Connection
NRGS 11-2, NRGS 16-2 ........................................................................................................................17
Wiring diagram ....................................................................................................................................17
Tools.....................................................................................................................................................18
Contents - continued -
Page
Checking electrical connection .............................................................................................................20
Switching on mains voltage ..................................................................................................................20
Checking assignation of switching functions.........................................................................................20
Checking low level (MIN) alarm.............................................................................................................20
Commissioning Procedure
Resetting low level (MIN) alarm.............................................................................................................20
Operation
Fault finding list for troubleshooting......................................................................................................21
Operational malfunctions
Factory setting......................................................................................................................................19
Switch selection of response sensitivity ................................................................................................19
Tools.....................................................................................................................................................19
Sensitivity of response
Exchanging the electronic insert ...........................................................................................................22
Removing and disposing of the compact system...................................................................................22
Exchanging the electronic insert, removing the compact system
4
Important Notes
Danger
When loosening the compact system steam or hot water might escape!
This presents the risk of severe scalding all over the body!
It is therefore essential not to dismantle the equipment unless the boiler pressure is veri-
fied to be 0 bar.
The equipment becomes hot during operation.
Risk of severe burns to hands and arms.
Before carrying out installation and maintenance work make sure that the equipment is
cold.
The terminal strip of the NRGS 11-2, NRGS 16-2 is live during operation.
This presents the danger of electric shock!
Cut off power supply before mounting or removing the housing cover!
Safety note
The equipment must only be installed and commissioned by qualified and competent staff.
Retrofitting and maintenance work must only be performed by qualified staff who - through adequate
training - have achieved a recognised level of competence.
Attention
The name plate specifies the technical features of the equipment. Do not commission or
operate any item of equipment that does not bear its specific name plate.
Usage for the intended purpose
Use the compact system NRGS 11-2, NRGT 16-2 as water level controller / limiter in, e. g, steam boilers
and (pressurised) hot water installations as well as in condensate and feedwater tanks.
ATEX (Atmosphère Explosible)
According to the European Directive 2014/34/EU the equipment must not be used in potentially explo-
sive areas.
Safety note
Note on the Declaration of Conformity / Declaration by the Manufacturer
For details on the conformity of our equipment according to the European Directives see our Declaration
of Conformity or our Declaration of Manufacturer.
The current Declaration of Conformity / Declaration of Manufacturer are available in the Internet under
www.gestra./de/documents or can be requested from us.
LV (Low Voltage) Directive and EMC (Electromagnetic Compatibility)
The equipment meets the requirements of the Low Voltage Directive 2014/35/EU and the EMC Directive
2014/30/EU.
5
Function
The NRGS 11-2, NRGS 16-2 is a compact-type system consisting of a level electrode with four tips and
an integrated level switching controller. For the correct functioning of the equipment the water must
have a minimum conductivity of >0.5 µS/cm at 25 °C.
The length of the individual electrode tips determines the switchpoints for the respective water levels.
The equipment monitors the water level by sensing whether the electrode tips are exposed or im-
mersed and - by energizing or de-energizing the controller output contact - switches the feedwater
pump on or off. The LED for pump is illuminated when the equipment switches the feedwater pump on.
When the water level falls below the low level, the two MIN electrode tips are exposed and after the
de-energizing delay the equipment switches the MIN output contacts. The safety circuit for the heating
will be opened after the de-energizing delay and the two MIN LED are illuminated.
A MIN alarm can be simulated by pressing the test button.
The heating will be switched off and interlocked. To reset the interlock the MIN electrode tips must
enter the water again and the button “Reset” must be pushed.
Explanatory Notes
Scope of supply
NRGS 11-2
1 Compact system NRGS 11-2
1 Joint ring D 33 x 39 DIN 7603-1.4301,
bright annealed
1 Installation manual
NRGS 16-2
1 Compact system NRGS 16-2
1 Joint ring D 33 x 39 DIN 7603-1.4301,
bright annealed
1 Installation manual
NRGS 11-2, NRGS 16-2
Technical data
Type approval no.
TÜV · WR/WB · xx-392
Service pressure
NRGS 11-2: 6 bar at 159 °C, NRGS 16-2: 32 barg at 238 °C
Mechanical connection
Screwed G 1, EN ISO 228-1
Materials
Terminal box 3.2161 G AlSi8Cu3
Sheath 1.4301 X5 CrNi18-10
Screw-in body 1.4571 X6 CrNiMoTi17-12-2
Electrode tips 1.4571 X6 CrNiMoTi17-12-2
Insulation
PTFE
Spacer disc PTFE
Electrode tips
Lengths available: 500, 1000, 1500 mm
6
Supply voltage
230 V +/– 10%, 50/60 Hz
115 V +/– 10%, 50/60 Hz
24 V +/– 10%, 50/60 Hz (optional)
Power consumption
5 VA
Fuse
external 63 mA , slow-blow, at 230 V and 115 V,
external 150 mA slow-blow at 24 V.
internal thermal fuse Tmax = 102 °C
Response sensitivity (electrical conductivity of water at 25 °C)
>0.5 ...< 1000 µS/cm or >10 ...< 10 000 µS/cm (switch-selectable)
Electrode voltage
10 Vss
Output
2 volt-free relay contacts, 8 A 250 V AC / 30 V DC cos f= 1
De-energizing delay: 3 sec. (MIN alarm)
1 volt-free relay contact, 8 A 250 V AC / 30 V DC cos ϕ= 1
(e. g. feedwater pump ON).
Provide inductive loads with RC combinations according to manufacturer’s specification to ensure
interference suppression.
Indicators and adjustors
2 red LEDs for signalling “Low water level”, 1 green LED for “Pump ON”.
1 four-pole code switch for selecting the response sensitivity.
1 push button for testing the MIN (low-level) alarm.
1 Push button “Reset”
Cable entry
Cable gland with integral cable clamp
M 16 (PG 9), M 20 (PG 16)
Protection
IP 65 to DIN EN 60529
Weight
Approx. 0.8 kg
Ambient temperature
when system is switched on: 0 ° ... 70 °C, during operation: -10 ... 70 °C
Transport temperature
–20 ... +80 °C (<100 hours), defrosting time of the de-energized equipment before it can be put into
operation: 24 hours.
Storage temperature
–20 ... +70 °C, defrosting time of the de-energized equipment before it can be put into operation:
24 hours.
Relative humidity
max. 95 %, no moisture condensation
NRGS 11-2, NRGS 16-2 - continued -
Technical Data - continued -
7
Technical Data - continued -
Name plate / marking
Fig. 1
Disposal note
Type approval no.
Safety note
Equipment designation
Type of threaded end,
material number
Pressure rating
Supply voltage
Max. ambient temperature
Protection
Electrical specification
Response sensitivity
XX
CE Marking
Operating note
Manufacturer
8
Dimensions
Technical Data - continued -
Fig. 2
≤42
b = 70
Fig. 3
N8
N10
0.5
∅ 40
1" , DIN 228
7
9
8
0
50
65-70
≤ 14
173
140
337.5
500, 1000, 1500
9
Functional Elements
NRGS 11-2, NRGS 16-2
Fig. 5
Fig. 4
a b c
1234
d
ji
f
h
g
6
5
e
k
65
10
1 LED “MIN alarm”
2 LED “MAX alarm”
3LED “Pump ON”
4Code switch for “Response sensititiy”
5Push button “TEST”
6Push button “RESET”
7Thermal insulation, provided on site, ∅= 20 mm (outside of thermal insulation of steam boiler)
8Seating surface
9Joint ring D 33 x 39 DIN ISO 7603-1.4301, bright annealed
0Screw-in thread G1, EN ISO 228-1
aHousing screws M4
bCable gland PG 9 /PG 11
cHousing cover
dFixing screws for cover plate
eSeparating segment
fTerminal strip
gPE connection
hTerminal strip for testing
iThermal fuse Tmax 102 °C
jHexagon nut
kCover plate
Dimensions / Functional Elements - continued -
Key
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