TM 9-6115-664-13&P
h.
Local Control Panel Assembly. The local control panel assembly (2, Figure 1-1) is mounted at the right rear
corner of the enclosure assembly and contains all the control devices required to operate the APU. The local control
panel allows the operator to start and run the APU, transfer control to the remote control panel assembly (3), and stop the
APU in the local or remote operating mode.
i.
The local control panel assembly consists of a START / PRIME RUN / OFF switch, PREHEAT switch, APU ON
switch, LOCAL / REMOTE switch, REMOTE panel cable connector receptacle, three APU electrical test points, 5 LED
indicator light, a printed circuit board, and associated breakers, relays, and connectors. The control panel enclosure
forms a water-resistant shield for internal components. One electrical receptacle on the rear of the panel connects the
panel to the APU wiring harness.
j.
The control panel may be removed from the enclosure assembly as a unit, allowing for easy maintenance.
Refer to Description and Use of Operator's Controls and Indicators (Chapter 2) for detailed information on control panel
assembly components.
k.
Remote Control Panel. The remote control panel (Figure 1-1) allows for operation of the APU from inside of
the vehicle. The remote control panel consists of a DC voltmeter, START / PRIME RUN / OFF switch, PREHEAT switch,
BATTLE SHORT OFF switch, APU ON switch, EMERGENCY STOP push-button, a printed circuit board, and associated
connectors. LED indicator lights are used to indicate the following conditions; APU ON, battle short ON, HIGH ENGINE
TEMPERATURE, and LOW OIL PRESSURE. LEDs are tested using a PRESS TO TEST LAMPS switch, located on the
remote panel.
l.
An eight (8) foot interconnect cable connects the APU local control panel to the remote control panel. Refer to
Description and Use of Operator's Controls and Indicators (Chapter 2) for detailed information on remote control panel
assembly components.
m. Fuel System and Fuel Module. APU fuel system components are housed within a removable fuel module
(Figure 1-2). The fuel module consists of an inlet fuel fitting (1), fuel filter water separator (2), electric fuel pump (3), fuel
float valve assembly (4), and related hoses and fittings.
n.
The module is fitted with a removable cover (5) for ease of maintenance and may be removed as a unit from the
APU enclosure. The module cover is equipped with three slide latches that secure the cover during unit operation. A hole
in the module cover moderates air temperature, keeping the temperature within the module cooler than the temperature
within the rest of the APU enclosure.
o.
Fuel for operation of the APU is supplied to the fuel module from the vehicle by way of a fuel interface hose.
The APU may also be operated from an external fuel supply utilizing the same inlet fuel fitting (1). A fuel supply line (6)
passes fuel from the fuel filter water separator (2), through an in-line fuel filter (7), to the engine fuel pump. A fuel return
line (8) directs fuel from the engine fuel injector line to the fuel float valve assembly (4).
p.
The fuel module also houses the NATO electrical receptacle (9), contactor, and related wiring and terminals that
control power output to the vehicle.
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