Gas Detection System GDS-24-2/4 User and Installation Manual
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J4.6
Valve Control – NC
Normally Closed Contact of Valve Control Relay
J4.7
Fault / RST – NO
Normally Open Contact of Fault/RST Relay
J4.8
Fault / RST – C
Common Contact of Fault/RST Relay
J4.9
Fault / RST– NC
Normally Closed Contact of Fault/RST Relay
Table 6: J3, J4 and J12 Connections
NOTE: Zone 3 and Zone 4 not connected for GDS-24-2.
4
Field Wiring Diagram
This section explains the field wiring connections for GDS-24-2 & GDS-24-4.
4.1
Initiating Device Circuit (IDC)
•
No. of Initiating circuit
: 2/4 Zone
•
Type
: Class B
•
Wire Size
:
1.5sqmm armoured FRLS cable
•
Operating Voltage
:
24 VDC nominal max
•
Connector
:
J3
•
Monitoring Device
:
4.7 K Ω, 1 W(EOL)
•
Resistor to be connected
in series with detector : 820 Ω, 1 W.
Figure 13: GDS-24-2/4 Typical Zone Connections
Total available Current for connecting Gas Detectors is 600 mA for GDS-24-2 and 1.8 Amp for GDS-24-4.
Example:
1
] TS21I Gas detector requires 250 mA current in High Alarm condition, thus we can connect
maximum 2 TS21I gas detectors to GDS-24-2 and maximum 7 TS21I gas detectors to GDS-24-4.
