T1216W-C
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5.3
Modifications to the Water Mist
Relay Control Panel
Three modifications to the Water Mist Relay Control
Panel [WMRCP] are necessary to provide the
correct interface. See Modifications 1, 2 and 3 in
section 13.
These modifications should be carried out by
either the Engineer responsible for the WMRCP
or under their direct guidance and instruction.
5.3.1
Modification 1 [System Abnormal]:
Refer to Figure 5 for details.
On Relay R50/2, disconnect wires 313 and 314
from the normally closed contact pair and reconnect
to the normally open pair. [Contacts described with
RL50 de-energised
– i.e. in the fault condition].
Remove the 6k8 monitoring resistor connected
between wires 313 and 314. Use two spare field
terminals to connect a 10K 0.25W resistor in series
with R50/2.
6k8
Resistor
TB5/3
TB5/4
313
314
R50/2
De-energised
(fault condition)
Before Modification
10k
Resistor
TB5/3
TB5/4
313
314
R50/2
De-energised
(fault condition)
After Modification
Wire
Link
WaterMist Control Panel
System Abnormal Output Signal
U3
U4
Site Wiring to
T1216W-C
Site Wiring to
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Figure 5
– System Abnormal Modification
5.3.2
Modification 2 [System Operated]:
Refer to Figure 6
for details.
Replace the 6k8 monitoring resistor connected
between wires 315 and 316 with a 10k 0.25W.
Use two spare field terminals to connect 680 Ohm 1
Watt resistor in series with R44/3.
6k8
Resistor
TB5/1
TB5/2
315
316
R44/3
Relay shown in
quiescent
(non-alarm)
condition
Before Modification
680 Ohm
Resistor
TB5/1
TB5/2
315
316
R44/3
After Modification
Wire
Link
WaterMist Relay Control Panel
System Operated Output Signal
U1
U2
10k
Resistor
Relay shown in
quiescent
(non-alarm)
condition
Site Wiring to
T1216W-C
Site Wiring to
T1216W-C
Figure 6
– System Operated Modification
