GESTRA TRS 5-8 User manual

1
TRS 5-8
Installation Instructions 810709-02
Temperature Switch
TRS 5-8
GESTRA Steam Systems
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Contents
Usage for the intended purpose ..............................................................................................................4
Safety note .............................................................................................................................................4
Danger ...................................................................................................................................................4
Attention.................................................................................................................................................4
PED (Pressure Equipment Directive)........................................................................................................4
ATEX (Atmosphère Explosible).................................................................................................................4
Important Notes
Page
Explanatory Notes
Scope of supply ...................................................................................................................................... 4
Description .............................................................................................................................................5
Function .................................................................................................................................................5
System components ...............................................................................................................................5
Design.................................................................................................................................................... 5
TRS 5-8................................................................................................................................................12
Attention...............................................................................................................................................12
Tools.....................................................................................................................................................12
Key.......................................................................................................................................................12
Examples of Installation ........................................................................................................................13
Installation
TRS 5-8..................................................................................................................................................6
Corrosion resistance ...............................................................................................................................7
Name plate/ marking ..............................................................................................................................7
Dimensions.............................................................................................................................................8
Technical Data
TRS 5-8..................................................................................................................................................9
Key.......................................................................................................................................................11
Design
TRS 5-8................................................................................................................................................10
Key.......................................................................................................................................................11
Functional Elements

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Wiring
TRS 5-8................................................................................................................................................14
Attention...............................................................................................................................................14
Note .....................................................................................................................................................14
Tools.....................................................................................................................................................14
Key.......................................................................................................................................................14
Wiring diagram ..................................................................................................................................... 15
Check wiring ........................................................................................................................................18
Apply mains voltage.............................................................................................................................. 18
Contents - continued -
Commissioning
Page
Temperature controller .........................................................................................................................18
Note .....................................................................................................................................................18
Operation
Danger .................................................................................................................................................19
Fault-finding list for troubleshooting......................................................................................................19
Operation Malfunctions
Danger .................................................................................................................................................20
Disposal................................................................................................................................................20
Decommissioning
TRS 5-8................................................................................................................................................18
Performance test
Declaration of Conformity .....................................................................................................................21
Annex
Basic Settings
Adjusting temperature limit...................................................................................................................16
Example 1 ...........................................................................................................................................16
Example 2 ...........................................................................................................................................16
Example 3 ...........................................................................................................................................16
Tools .................................................................................................................................................... 16
Code switch settings ............................................................................................................................17

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Important Notes
Danger
The terminal strip of the equipment is live during operation.
This presents the danger of electric shock.
Cut off power supply before mounting or removing the terminal strips
and the housing cover.
Usage for the intended purpose
Use temperature switch TRS 5-8 only in conjunction with resistance thermometers TRG 5-53, TRG 5-54,
TRG 5-55 and TRG 5-57 for signalling limit temperature.
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.
Explanatory Notes
Scope of supply
TRS 5-8
1 Temperature switch TRS 5-8
1 Installation manual
ATEX (Atmosphère Explosible)
The equipment constitutes a simple item of electrical equipment as defined in DIN EN 50020 section
5.4. According to the European Directive 94/9/EC the equipment must be equipped with approved
Zener barriers if used in potentially explosive areas. Applicable in Ex-zones 1, 2 (1999/92EC). The
equipment does not bear an Ex-marking. The suitability of the Zener barriers is certified in a separate
document.
Attention
The name plate specifies the technical features of the equipment. Note that any piece of
equipment without its specific name plate must neither be commissioned nor operated.
PED (Pressure Equipment Directive)
The equipment fulfills the requirements of the Pressure Equipment Directive PED 97/23/EC.
For applications with fluids of group 1 and 2.
With CE marking (apart from equipment according to section 3.3 that is excluded from the scope of this
directive).

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Description
Temperature switch designed for use with resistance thermometers type TRG 5-53, TRG 5-54,
TRG 5-55 or TRG 5-57.
The equipment works as temperature monitor. An alarm is given as soon as the temperature ex-
ceeds a preset limit. Application in steam boilers and pressurized hot-water plants operating without
constant supervision (TRD 604) as well as any other kind of heat generating units.
Explanantory Notes - continued -
Function
The temperature switch TRS 5-8 is a two-channel temperature monitoring system used in conjunction
with a standardized platinum resistance thermometer Pt 100 to IEC 751. A power source fitted with a
variable resistor supplies the resistance thermometer Pt 100 with a constant current.
The desired cut-off temperatures are adjusted by means of an eight-pole code switch. To ensure a fail-
safe alarm signal as soon as the temperature exceeds the max. limit the output contact relays of the
TRS 5-8 are of the normally closed type. In the event of a power supply failure the temperature switch
will raise an alarm.
The temperature switch can signal the following two operating conditions:
■Normal operation (temperatures within permissible range)
■Alarm (temperatures above/below limit)
A green LED indicates mains supply ON. Two red LEDs are illuminated if the temperature exceeds or
falls below the limit.
System components
TRG 5-53
Temperatue sensor with threaded connection piece ½", PN 40
TRG 5-54
Temperatue sensor with threaded connection piece ½", PN 40
TRG 5-55
Temperature sensor with weld-in protection ∅18 mm, PN 160
TRG 5-57
Temperature sensor with weld-in protection ∅18 mm, PN 160
Design
TRS 5-8
Plug-in unit in plastic case for installation in contol cabinets The terminals in the case are accessible
after loosening two screws and unplugging the unit from its base. Thanks to the code plug the
equipment cannot be connected inadvertently to wrong GESTRA equipment. The equipment may be
clipped onto a 35 mm supporting rail or screwed into position on a mounting panel.

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TRS 5-8
Technical Data
Type approval
DIN TW 106807
Input
Connection for resistance thermometer (Pt 100):
TRG 5-5..., PN 40-160, Tmax 400 °C – 540 °C.
Output
2 volt-free relay contacts. Max. contact rating with switching voltages of 24 V, 115 V and 230 V AC:
4 A resistive, 0.75 A inductive at cos ϕ0.5.
Max. contact rating with a switching voltage of 24 V DC: 4 A.
Contact material: silver, hard-gold plated.
Temperature limit range
30 °C to 540 °C, adjustable via code switch in steps of 2 °C.
Switching hysteresis
At MAX limit –5 °C,
At MIN limit 5 °C.
Indicators and adjustors
Two LEDs “Alarm”, one LED “Power”,
one code switch for “MIN temperature”, one code switch for “MAX temperature”.
Mains supply
230 V +/– 10 %, 50/60 Hz.
Special voltages 115 V +/– 10 %, 50/60 Hz or 24 V +/– 10 %, 50/60 Hz.
Power consumption
5 VA
Protection
TRS 5-8 b:
IP 20 to DIN EN 60529
Admissible ambient temperature
0 °C to 55 °C
Body materials
TRS 5-8 b:
Base ABS, black. Cover: Polystyrol, highly shock resistant, stone grey.
Front panel: Aluminium.
Weight
Approx. 0.6 kg

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GESTRA AG
Münchener Str. 77
D-28215 Bremen
Vor Öffnen des Gehäuses
Gerät freischalten
TRS 5-8b
115V24V
Temperaturschalter
230V
50 / 60 Hz 5VA IP 20
Tamb = 55°C (131°F)
Wirkweise Typ 2B
250 V ~ T 2,5 A
Before opening the equipment
cut off power supply.
Avant d'ouvrir l appareil
couper l'alimentation secteur.
'
Temperature switch
Commutateur de température
Corrosion resistance
If the unit is used for the intended purpose, its safety is not impaired by corrosion.
Technical Data - continued -
Name plate/ marking
Fig. 1
Mains supply
Protection
External fuse
Equipment designation

8
Technical Data - continued -
Dimensions
Fig. 2
106 7
Fig. 3
37.5
75
158
95

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Design
Fig. 6
2 3
4
Fig. 4 Fig. 5
DIN TW
106805
TRS 5-8
MADE BY GESTRA
2
256
128
64
32
16
8
4°CMAX
MIN
2
256
128
64
32
16
8
4
°C
1
1
TRS 5-8
7
6
5

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Functional Elements
TRS 5-8
MAX 55°C
MAX 95%
%
IP 20
DIN TW
106805
TRS 5-8
MADE BY GESTRA
2
256
128
64
32
16
8
4°CMAX
MIN
2
256
128
64
32
16
8
4
°C
"
9
0
!
§
Fig. 7