TM 9-4120-405-13&P
Section V. UNIT TROUBLESHOOTING PROCEDURES
4-17. GENERAL.
a. This section contains troubleshooting information for locating and correcting most of the operating troubles which
may develop in the trailer- mounted, generator-set powered, air conditioner. Each malfunction for an individual
component, unit, or system is followed by a list of tests or inspections which will help you determine corrective actions to
take. You should perform the tests/inspections and corrective actions in the order listed.
b. This manual cannot list all malfunctions that may occur, nor all tests or inspections and corrective actions. If a
malfunction is not listed, or is not corrected by listed corrective actions, notify your supervisor.
c. Table 4-3 lists the common malfunctions which you may find during the operation or maintenance of the trailer-
mounted, generator-set powered, air conditioner or its components. You should perform the tests/inspections and
corrective actions in the order listed.
WARNING
HIGH VOLTAGE
is used in operation of this equipment.
DEATH ON CONTACT
may result if personnel fail to observe safety precautions.
Never work on electrical equipment unless there is another person nearby who is
familiar with operation and hazards of equipment, and who is competent in
administering first aid. When technician is aided by operators, he must warn them
about dangerous areas.
Whenever possible, input power supply to equipment must be shut off before
beginning work. Take particular care to ground every capacitor likely to hold a
dangerous charge. When working inside, after power has been turned off, always
ground every part before touching it. Be careful not to contact high voltage
connections of 208 volts AC input when installing or operating this equipment.
Whenever nature of operation permits, keep one hand away from equipment to
reduce hazard to current flowing through vital organs of body. Do not operate
equipment without all guards, louvers, and covers in place and tightly secured.
WARNING
High noise area. May cause hearing loss. Use proper ear protection within 14 ft.
All personnel involved in the operation or maintenance of the generator set should
become thoroughly familiar with the safety precautions prior to performing
operation or maintenance procedures.
Prior to connection of load cables, make sure all switches are in OFF or OPEN
position and the generator set is not operating.
Inspect the generator set ground connection prior to starting the unit. Electrical
defects in load lines or load equipment can cause death by electrocution when
contact is made with an ungrounded system.
4-23
