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OPERATING THE AUXILIARY POWER UNIT (APU)
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TM-5-4210-233-14-P-1 Firfighting Truck 100 Ft. Aerial Ladder 1000 GPM Manual
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Filling the Foam Tank -706880093
TM 5-4210-23314&P-1
2-16. OPERATING THE AUXILIARY POWER UNIT (APU) - Continued
c. Stopping.
(1) Push the GENERATOR START-STOP switch to the STOP position.
(2) Release switch when APU engine stops.
(3) If stop circuit fails, close fuel supply valve at APU.
2-17. AFTER MISSION PROCEDURES
a.Flushing of Foam Piping and Hoses.  After foam has been used, the foam and water pipes, including fire
hoses and/or nozzles, must be flushed with clean water. If necessary, drain and fill the water tank prior to
flushing.
NOTE
Valves and controls listed are on pump operating panel.
(1) Be sure the FOAM valve is closed. Start the fire pump (see para 2-13).
(2) Fully open the FLUSH valve, WATER valve and FOAM METERING valve on the pump
operating panel.
(3) Regulate pump discharge pressure to 150 psi (1035 kPa) using THROTTLE control.
(4) Open DISCHARGE valves and hose nozzles, including the aerial nozzle, in turn until clean water
discharges from each nozzle.
(5) Close FLUSH and WATER valves.
(6) Shut down the firefighting system.
NOTE
Steps (7) and (8) need only be carried out when the temperature
is less than 32 deg. F (0 deg. C).
(7) Drain residual water from the aerial nozzle, fire pump and hose piping.
8) Install all fire hose and hose nozzles in storage position on the truck. Install all caps.
b. Draining Water and Foam Tanks.
NOTE
Valves and controls listed are on pump operating panel.
(1) To drain the water tank, pull out the TANK DRAIN valve lever. Water may be drained directly
onto the ground.
NOTE
Be sure the TANK DRAIN valve is closed, (lever pushed in)
after draining.
2-64

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