< BackPneumatically Actuated Systems

Example1: Mechanical Control Head with 4 Nozzle Installation: The most basic combination of hardware to the pressurised agent cylinder. In this case, detection of fire and actuation of the suppression system relies solely on the vehicle operator. Care must be taken to locate the agent cylinder in convenient proximity to the vehicle operator. Actuation is accomplished by pulling a ring pin, then pulling a T-handle lever to open the agent cylinder valve. This combination is ideal for small vehicles where fires can be quickly spotted by operators and where only one actuation location is required. Figure 2-2 shows a V25 - 4 nozzle system, however the Mechanical Control Head will work with any size agent cylinder.

Example2: Remote Pneumatic Manual Only Actuation with Dual 4 Nozzle Installation: In some installations, multiple actuation locations are required even though automatic detection and automatic actuation is not. In these cases, Amerex pressurised agent cylinders should be fitted with a pneumatic control head and connected to one or more manual actuators. As in Example 1, detection of the fire and actuation of the suppression system rely solely on the equipment operator or other personnel who may be close by. Actuation is accomplished by pulling a ring pin on any one of the manual actuators, and striking down hard on the palm button. Depression of the palm button releases nitrogen pressure, which, in turn, powers the pneumatic control head to open the agent cylinder valve(s). If engine shutdown, fuel shutoff, or remote alarm actuation is desired, a Pressure Operated Switch should be plumbed into the actuation network between the agent cylinder(s) and the closest manual actuator. Nitrogen pressure released by any manual actuator will activate the switch.

Example3: Automatic or Manual Actuation with Multiple Actuation Points: Many O.E.M’s. have chosen Amerex systems with automatic fire detection and suppression actuation to protect vehicles and passengers. The use of the electrically actuated system has proven to be well suited for these types of vehicles. Most installations will require the previously described remote Manual Actuation Switches combined with automatic fire detection and suppression system actuation. The use of the electric actuation switch is preferred by operators as its small size allows it to be mounted in the existing instrument panel within easy reach of the driver. These systems may use the same arrangement of Electrical Manual Actuation Switches and a Circuit Monitor or Control Panel, but adds thermostats in the hazard areas for heat detection. Each agent cylinder is fitted with an Electric Control Head. Actuation current is provided to the Electric Control Head by thermostats or the operator pressing the FIRE button on any Manual Actuation Switch. If engine shutdown is required the Modular Control Panel must be is used as it features an internal relay which can be connected to shut off the engine in the event of a fire. Power to operate the system is drawn from the vehicle battery. A 24-hour self-recharging back-up battery is located inside the Control Panel.

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