800027-A 16 06/05/2023
3.8.3 Pressure Switch Assembly (400441)
The pressure switch assembly is available as an optional part for the system detection network. The fitting on the exterior of the pressure switch
assembly enclosure allows for the detection tubing to be easily installed into the assembly.
The pressure switch assembly 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 12 – Pressure Switch Assembly, Table 16 –Pressure Switch Assembly 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.
The pressure switch assembly (400441) contains the same pressure switch as the valve mounted option (400001).
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.
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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