TM 10-7310-281-13&PMODERN BURNER UNIT (MBU)0005 00OPERATION UNDER USUAL CONDITIONS0005 00-21Normal Shut-Down. When the burner is no longer required, it should be shut-down. To do so, simplypush the STOP button. This will interrupt the ignition cycle and the burner will shut down immediately.Automatic System Shut-down: The MBU is programmed to shut down automatically when thefollowing conditions exist (appropriate indicator lights will be illuminated). Refer to Table 1 for a detaileddescription of fault indicators.Voltage.This indicator lights when the power requirements of the MBU are not being met. The powerbeing supplied to the MBU is either below 22V DC or greater than 29.5V DC. The indicator will light redand the system will shut-down. The power source should immediately be checked in the sequencelisted below.Ifcommercialorgeneratorsuppliedpowerisused:Verify that power source is supplying 110V AC.Verify that power converter main power switch is ON.(With power converter switch temporarily in the OFF position) check 24V DC power cable connectionsbetween the power converter, 24V DC extension, branch cables, and MBU.If problem cannot be resolved refer to troubleshooting instructions in WP 0009.Ifvehicleorbatterypowerisused:Verify that vehicle is supplying between 22 and 29.5V DC as measured with a multimeter.Verify that battery pack 3-Position Function Switch is in the RUN position.Verify that the battery pack is operating correctly by checking the Charging Status indicators on the frontcontrol panel.With battery pack 3-Position Function Switch temporarily in the OFF position, check all 24V DC powercable connections between the battery pack, branch cable, and MBU.If problem cannot be resolved refer to troubleshooting instructions in WP 0009.Service. A fault has occurred in the burner circuitry or mechanical systems that prevents normal operation. The immediate and proper operator response is to perform troubleshooting procedures inaccordance with WP 0009.Low Fuel. This indicator will light green, amber, and red as indicated in Table 1. The burner will shut-down when it has run out of fuel. The MBU must be re-fueled before proceeding.
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