TM 9-2330-271-14&P
(1) Turn air conditioner rotary control switch
2-17.
Heating System, XM822
on the air conditioner remote control panel to VENT.
(2) Set heater thermostat on the heater
a.
General
remote control unit to the desired temperature.
(1) The heating system is composed of a
(3) Set rotary control switch to the desired
heater assembly consisting of 12 heating elements
position.
located in the air conditioning duct to the rear of the air
(4) To stop the heating system, set rotary
conditioner.
control switch to OFF and then set air conditioner rotary
(2) The heater assembly contains six 100-
control switch to OFF.
watt, 220-volt elements located on the lower tier, and six
1600-watt, 220-volt elements located on the upper tier of
2-18.
Fire Extinguisher
the heater assembly.
(3) The remote control unit containing the
a. The
XM738,
XM739,
and
XM739E1
thermostat and the rotary control switch is located on the
roadside wall forward of the main control panel. The
semitrailers have one fire extinguisher located in the
rotary control switch has four positions: OFF, LOW,
interior of the van.
b. The XM654 semitrailer has two fire
MEDIUM, and HIGH.
(4) LOW position activates the 1000-watt
extinguishers. One extinguisher is mounted over the
heating elements and lights HEATER NO. 1 indicating
rear door; the other is mounted on the side near the right
lamp.
side door.
(5) MEDIUM position activates the 1600-watt
c. The XM680 and XM680E1 semitrailers have
heating elements and lights HEATER NO. 2 indicating
two fire extinguishers. One extinguisher is mounted on
lamp.
the side near the right side door; the other is mounted on
(6) HIGH position activates both the
a partition near the left side door.
1000-watt and the 1600-watt heating elements and
d. Each fire extinguisher is held in place with a
lights both HEATER NO. 1 and HEATER NO. 2
bracket and clamp. The extinguisher is removed from
indicating lamps.
the bracket by pulling the latch, which releases the
(7) A safety switch is installed in the duct
clamp.
above the heating elements to shut off heater power in
e. To use the fire extinguisher, rotate the horn to
the event the unit overheats.
an UP position. Break the safety wire and remove the
b. Operating Heating System
safety pin. Operate the extinguisher by squeezing the
trigger and directing the horn at the base of the flame.
Section III. OPERATION UNDER UNUSUAL CONDITIONS
sandy conditions and after fording operations, refer to
2-19.
General
d. When chronic failure of materiel results from
a. In addition to the normal preventive
subjection to extreme conditions, report the condition on
maintenance service, special care in cleaning and
DA Form 468.
lubrication must be observed where extreme
temperature, humidity, and terrain conditions are present
or anticipated. Proper cleaning, lubrication, and storage
2-20.
Operation in Extreme Cold
and handling of fuels and lubricants not only insure
proper operation and functioning, but also guard against
a.
General.
(1) Your semitrailer must be fully prepared
the materials.
when scheduled for operation in extreme cold weather.
b. TM 21-300 explains driver selection, training,
Generally, extreme cold causes lubricants to thicken or
and supervision, while TM 21-305 provides special
congeal, cracks insulation, causes electrical short
driving instructions for operating wheeled vehicles under
circuits, and various construction materials become hard,
unusual conditions. Read and study TM 21-300 and TM
brittle, and easily damaged or broken.
21-305 before attempting to use your semitrailer under
unusual conditions.
operating procedures under unusual conditions. For
lubrication procedures under operation in dusty and
2-9