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The alarm trimpot may be adjusted by turning ciockwise to increase the sensitivity, or <br />counter -clockwise to decrease the sensitivity. An overly sensitive set point may be subject to <br />background noise effect and causing random nuisance false alarms. Under normal condition ( <br />i.e., the field is not contaminated) it is recommended to adjust the set point to approximately 1 1/ <br />2 to 2 turns counter -clockwise back from the alarm point for gasoline, and 1/2 turn for <br />diesel applications. <br />IV.2.3. ALARM TEST SWITCHES <br />On the enclosure front cover panel are two push-button switches marked LIQUID and <br />VAPOR. These switches are for functional test of the vapor and liquid alarm circuits. <br />When the LIQUID switch is pushed, the alarms of all the active liquid sensing channels will be <br />activated. Similarly, the alarms of all the active vapor sensing channels will be activated when <br />the VAPOR switch is pressed. <br />WARNING: Do not attempt to troubleshoot this system unless you are completely familiar <br />with the operation and maintenance and are familiar with standard troubleshooting <br />techniques. <br />WARNING: Do not install or remove any parts, components, subassemblies or assemblies <br />with power applied to the system. Confirm that the power switch on the Leak Alert system is in <br />the OFF position and the power to the system is also OFF before touching anything inside <br />the enclosure. <br />The only field replaceable parts are the PC channel card, zener safety barrier, liquid and vapor <br />sensor only. Contact your service representative, or factory, for service information. <br />27 <br />