TM 9-2330-246-14
2-15. OPERATING AIR CONDITIONER (M348A2H).
a. General. Three model CE20VAL6, 208-volt, three-phase, 60 Hz, 18,000 BTU air conditioners are
mounted in the front-hand side of the M348A2H semitrailer. An intake grille is located at the upper section of the air
conditioner and is operated by a lever. The damper door is located beneath the intake grille and is operated by a chain.
A condensate drain is incorporated at the bottom of each air conditioner. Refer to TM 5-4120-222-14 for operation,
service, and maintenance instructions for the air conditioner.
b. Operating Air Conditioner for Ventilation or Air Circulation.
(1) Set selector switch to VENTILATE.
(2) Open damper door and close intake grille damper.
c. Operating Air Conditioner for Cooling.
(1) Position thermostatic switch for desired temperature.
(2) Set selector switch to COOL.
(3) For cooling with 100 percent recirculated air, close damper door and open intake grille damper.
(4) For cooling with fresh air, open damper door and partially close intake grille damper.
(5) For cooling with fresh air drawn through chemical-biological filter unit, when outdoor air is
contaminated, close damper door and partially close intake grille damper.
(6) To stop air conditioner, set selector switch to OFF.
d. Operating Air Conditioner for Heating.
(1) Set thermostatic switch for desired temperature.
(2) Set selector switch to LO HEAT or HI HEAT.
(3) For heating with 100 percent recirculated air, close damper door and open intake grille damper.
(4) For heating with fresh air, open damper door and partially close intake grille damper.
air is
(5) For heating with fresh air drawn through chemical-biological filter unit, when outdoor
contaminated, close damper door and partially close intake grille damper.
(6) To stop air conditioner, set selector switch to OFF.
2-16. OPERATING AIR CONDITIONER (M373A2D).
a. General. One air conditioner is mounted in front of the semitrailer, directly to the rear of the front door.
Three differenet air conditioners may be used on the M373A2D semitrailer: Carrier CE60-D-60, Airflow
CE60-C-60, or Ellis and Watts CE60-C-60. All are 208-voIt, three-phase, 60 Hz, 60,000 BTU. Adjustable mounts are
provided at the top of the semitrailer to accommodate the air conditioner. The remote control panel is mounted on a
parlition to the rear of the air conditioner unit.
b. Operating Air Conditioner for Ventilation.
(1) Open hinged panels on front door of semitrailer.
(2) Open fresh air damper by positioning handle for desired opening and allow a small quantity of fresh
air to mix with circulating air.
(3) open filter panel to desired position to admit fresh filtered air.
2-15