Fire System Monitoring Panels
Chubb Fire & Security Pty Ltd
Technical Manual
Page 13 of 22
Pressure low switch
The pressure low switch will open circuit if the suppression system develops a leak or if the system
discharges. The open circuit condition will cause the ‘
LOW PRESSURE’
LED to illuminate and the
audible alarm to sound once every ten 10 seconds.
Discharge pressure switch
When the suppression system is actuated, the discharge pressure switch(s) are used to confirm that
agent has been released from the cylinder(s) by illuminating and latching both the ‘
ALARM
’ and
‘
DISCHARGED
’ LEDs. In this state, the audible alarm will sound once per second.
In the case of the FSM-ES panel, the ‘
ALARM
’ condition will also illuminate the ‘
SHUTDOWN
’
amber LED and initiate the countdown timer. See page 17 ‘ Engine Shutdown (FSM-ES) for more
information.
For PEFS systems, pressure switches should be installed in the cylinder valves as depicted in Figure
15.
Figure 15 - PEFS pressure switch arrangements
Switches for multiple PEFS Cylinder Installations
Pressure Low switch
For multiple LOP cylinder installations, which have a common LOP actuation system, a single
cylinder low pressure switch may be fitted either to:
•
one of the cylinder valves’ low pressure switch ports
•
at any suitable point in the LOP actuation system
For multiple ROP cylinder installations, a cylinder low pressure
MUST
be fitted to each cylinder valve
and wired in series (Fig 16).
Discharge Pressure Switch
For multiple LOP and ROP cylinder installations a discharge pressure switch
MUST
be fitted to each
cylinder valve and wired in series (Fig 16) to allow redundancy in shutdown should a valve fail to
operate correctly.
Discharge
Pressure Switch
Pressure Low
Switch
