LIQUID-COOLING SYSTEM MAINTENANCE RESPONSIBILITY

On the lower half of each alarm module is a four- way position switch that allows you to place the individual alarm module in the following modes: NORMAL: This is the normal operation mode. With the sensor contacts open, the upper indicator lamp in the module is on steady while the lower lamp is off. If an alarm condition occurs, the sensor con- tacts will close; the upper lamp will then flash while the lower lamp remains off and an alarm command from the module actuates atone generator, producing a wailing alarm. If the sensor loop is open-circuited, with the selector switch in the NORMAL position, the alarm module will signal a supervisory failure. In this case, the upper lamp will be off while the lower lamp will be steadily on, and the tone generator will come on, producing a pulsating alarm. STANDBY: This is the position for acknowl- edging an alarm. If the selector switch is moved from the NORMAL to the STANDBY position during an alarm condition, both the upper and lower indicator lamps will be steadily on and the audible alarm will be silenced. When the alarm condition is cleared with the selector switch in the STANDBY position, the lower lamp will change to a flashing mode and the upper lamp will go out. Also, the command will be fed to the tone generator, producing a pulsating alarm. CUTOUT: With the selector switch in the CUTOUT position, the upper lamp is out while the lower lamp is steadily on. In this position, power is re- moved from the sensor loop to facilitate maintenance. TEST: The TEST selector switch position sim- ulates an alarm condition. The upper indicator lamp flashes while the lower lamp is off, producing a wail- ing alarm. LIQUID-COOLING SYSTEM MAINTENANCE RESPONSIBILITY The most important responsibility that you have as a Fire Controlman that will extend the life of the liquid-cooling system components and increase the reliability of the cooling system is how you perform preventive and corrective maintenance according to the PMS. Properly performed preventive maintenance drastically reduces the amount of corrective mainte- nance necessary. When cooling systems are neglected, they deteriorate very quickly. To restore the cooling system to its proper performance, you may have to undertake extreme and costly repairs. The PMS responsibility of the cooling system varies from one system to another. On some systems, the engineering department has the total responsibility of preventive and corrective maintenance. On other systems, you will share the maintenance responsibility jointly with the engineering department. In these situations, the Fire Controlman will probably perform the preventive maintenance, and the engineers will perform the corrective maintenance on major com- ponents. When assigned the responsibility for maintaining the cooling system, you should perform the preventive maintenance in accordance with the maintenance requirement cards (MRCs) for that equipment to maximize the operation of the cooling system. 2-26