FIRECLASS Prescient III
8.3 Connection Diagrams
Application, Installation & Commissioning Doc. version 2
55
8.3.3
Monitored Inputs
Fig. 11: Monitored Inputs
GAS
REL.
GAS
LOW
ISO
VALVE
GAS
TRAPPED
HOLD
ABORT
REMOTE
CTRLS
AUTO /
MANUAL
Isolation Valve is monitored for open circuit, short circuit, abnormal, fully open &
fully closed states.
Isolation Valve must be fitted with two SPDT limit switches; SW1 operates when valve is fully open,
SW2 when valve is fully closed.
Local terminal box may be required to accommodate monitoring resistors
680 R ¼ W
Normally
Open
Pressure
Switch
10 K ¼ W
EOL
680 R ¼ W
Normally Open or
Normally Closed
Low Pressure
Switch
10 K ¼ W
EOL
2 K
2
¼ W
Valve Open
680R ¼ W
Valve Closed
10 K ¼ W
EOL
SW1
SW2
1
1
2
2
680 R ¼ W
Normally
Open Gas
Trapped
Pressure
Switch
10 K ¼ W
EOL
Normal
(Valve Open)
State
A
U
T
O
/M
AN
IN
+
A
U
T
O
/M
AN
IN
-
AU
TO
/M
A
N
O
U
T
+
AU
TO
/M
A
N
O
U
T
-
ABORT IN
+
ABORT IN
-
ABORT OUT
+
ABORT OUT
-
HOLD IN
+
HOLD IN
-
HOLD OUT
+
HOLD OUT
-
Connections to SLU
1
0
K
¼ W
EO
L
1
0
K
¼ W
EO
L
10
K
¼
W
E
O
L
Connections to SLU
560 R ¼ W
RESET
1 K 8 ¼ W
SILENCE
ALARMS
4
K
7 ¼ W
SOUND
ALARMS
10 K ¼ W EOL
Panel Terminals
1 - Valve Fully Open
2 - Valve Not Open
1 - Valve Not Closed
2 - Valve Fully Closed
