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CONTROLS
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TM-5-4210-230-14P-1 Aerial Ladder Fire Fighting Truck Manual
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STALE AIR AND SMOKE
TM 5-4210-230-14&P-1 CONTROLS HEATING For proper cold weather operation the heat should be directed toward the floor level; therefore, close all instrument panel  outlets  and  fully  open  driver  floor  dump  outlet.    The driver floor dump is cable operated from a push-pull control at the instrument panel's upper left-hand side. Adjust the temperature "HTR" (heat) lever as required to   give   the   desired   degree   of   heat.      The   full   right   "HOT" position    provides    the    maximum    heat.        Move    the    "AIR OUTLETS"  control  lever  either  to  the  full  cab  position  or  to any of the other three detented positions in order to obtain the desired   air   flow   distribution   between   cab   heat   and   defrost requirements.  For the maximum air flow, move the fan switch to the "HI" position. The heater will also operate with the fan motor  in  the  "OFF"  position  due  to  the  ram  air  introduced during vehicle operation. DEFROSTING To obtain maximum defrosting, move the "HTR" lever to the "HOT" position and place the "AIR OUTLETS" lever on "DEF".  Adjust the fan speed to provide the desired air flow. CAUTION To clear system of humid air, operate blowers for  30  seconds  at  "HI"  speed  before  moving the  "Air  Outlets"  lever  to  the    "Def"  position. This  will  minimize  rapid  fogging  of  the  glass, which  can  occur  if  humid  air  is  blown  onto  a cool windshield. REMEMBER  a  fogging  condition  limits  vision thru   the   windshield,   which   could   result   in personal   injury   or   property   damage   in   the event of an accident. NEVER  drive  vehicle  unless  windshield,  rear window, rear view mirrors and other surrounding glass area is clear. To   improve   defroster   efficiency,   remove   ice and/or snow from glass area. FRESH AIR VENTILATION Fresh air enters the cab through either an independent  ventilation  system  or  through  the  heater  system itself.  The ventilation system is controlled by rotating the vent knob  located  just  left  of  the  center  instrument  panel  outlets. When the knob is turned counterclockwise, air enters the cab from the hood scoop and flows through the instrument panel outlets  and  floor  dump.   Except  for  the  ventilation  mode,  the knob should be rotated to its full clockwise position (vent door closed) for all other modes of operation. To increase the quantity of air entering the cab in the ventilation  mode,  the  fan  may  be  used  to  power  ventilate. Adjust the fan speed and air outlets for the desired air flow. AIR CONDITIONING To  properly  air  condition  your  cab  in  warm  weather close  the  driver  heat  dump  and  open  the  instrument  panel outlets.  Close all windows and ensure the vent knob is turned to its full clockwise position (vent door closed).  Set the "OFF" position  and  "A/C"  lever  on  "COLD".    For  maximum  cooling move the "FAN" switch to the "HI" position.  (The fan must be' on for A/C operation.) Place the "AIR OUTLETS" lever on the "CAB"  position,  then  adjust  the  instrument  panel  outlets  to evenly  distribute  the  air  around  the  occupant's  head,  chest and  belt  areas.    If  foot  areas  feel  warm,  partially  open  heat dump to achieve desired comfort. 2

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