Truck/Trailer Refrigeration Unit - Sunbelt Transport Refrigeration

SECTION 5ELECTRICAL SCHEMATIC WIRING DIAGRAM5.1 INTRODUCTIONThis section contains Electrical Schematic Wiring Diagrams covering the Models listed in Table 1-1. The followinggeneral safety notices supplement the specific warnings and cautions appearing elsewhere in this manual. They arerecommended precautions that must be understood and applied during operation and maintenance of the equipmentcovered herein.WARNINGBeware of unannounced starting of the fans, V-belts and belt driven components as the unit may startautomatically. Before servicing unit, make sure the Run - Stop switch is in the STOP position. Alsodisconnect the negative battery cable.WARNINGBeware of unannounced starting of the fans and V-belts caused by the thermostat and the start/stopcycling of the unit.WARNINGUndernocircumstancesshouldetheroranyotherstartingaidsbeusedtostartengine.CAUTIONUnder no circumstances should anyone attempt to repair the Logic or Display Boards! (see section4.21) Should a problem develop with these components, contact your nearest Carrier Transicolddealer for replacement.CAUTIONObserve proper polarity when installing battery, negative battery terminal must be grounded.Reverse polarity will destroy the rectifier diodes in alternator. As a precautionary measure,disconnect positive battery terminal when charging battery in unit. Connecting charger in reverse willdestroy the rectifier diodes in alternator.CAUTIONUnder no circumstances should a technician electrically probe the processor at any point, other thanthe connector terminals where the harness attaches. Microprocessor components operate atdifferent voltage levels and at extremely low current levels. Improper use of voltmeters, jumper wires,continuity testers, etc. could permanently damage the processor.CAUTIONMost electronic components are susceptible to damage caused by electrical static discharge (ESD).In certain cases, the human body can have enough static electricity to cause resultant damage to thecomponents by touch. This is especially true of the integrated circuits found on the truck/trailermicroprocessor.5-1 62-02884