800027-A 15 06/05/2023
3.8.2 End of Line Pressure Switch (400004)
The end of line pressure switch (400004) is available as an optional part for the system detection network. The thread on the end of the pressure
switch allows for easy installation into the threads of the end of line adapter. The provided washer (400003) included in this assembly, ensures that
the pressure switch will fully depress the Schrader core installed within the end of line adapter. The provided O-ring ensures that there will be an
adequate seal between the pressure switch and the end of line adapter. This is the same pressure switch used as a valve mounted option (400001).
The end of line pressure switch is used to monitor system pressure, system discharge, or it can be used to energize or de-energize electrically
operated equipment. If the detection network to which the pressure switch is attached to loses pressure and reaches a pressure of 135 ± 10 psig
[9.3 ± 0.7 bar] or below, the switch contacts will operate. Refer to Figure 11 – End of Line Pressure Switch, Table 15 – End of Line Pressure Switch
Part Number, Figure 10 –Pressure Switch Wiring Schematic and Table 14 – Pressure Switch Properties.
The pressure switch is single pole, double throw (SPDT) and can be wired in either the normally open (NO), normally closed (NC) configurations,
where the normal condition is at atmospheric pressure. When the unit is pressurized, the contacts switch over.
When the pressure switch is used on a standard supervisory input circuit, there will be no distinction between a wiring fault and device actuation. The
pressure switch shall be installed onto a circuit suitable for unit supervision in accordance with NFPA 70 National Electric Code and NFPA 72
National Fire Alarm and Signaling Code.
This device is only to be utilized when accepted by the authority having jurisdiction. All other uses of this switch should be approved by the authority
having jurisdiction.
NOTE: All detection devices and auxiliary alarm and control devices must be electrically compatible with each other. They must be approved by the
authority having jurisdiction.
NOTE: Firetrace recommends that all units be equipped with a pressure switch and connected into a notification or shutdown device, in the event of a
discharge.
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