Section   IV.    TROUBLESHOOTING 3-7.  General listed  in  table  3-2.  The  first This  section  contains  information  that  is  useful  in apparent  trouble  or  symptom, diagnosing   and   correcting   troubles   which   cause contains   the   probable   cause, unsatisfactory   operation   or   failure   of   the   air action is listed in the third column. Remedies that conditioner. are  beyond  the  scope  of 3-8.  Operator’s  Troubleshooting  Chart reported  to  organizational Troubleshooting  procedures  for  operator/crew  are Malfunction 1. Air conditioner fails to operate. 2.  Insufficient  cooling. 3. No heat or low capacity heat. Table  3-2.  Troubleshooting  Chart Probable   Cause a.  Main  power  cable  disconnected. b.  Control  or  compressor  circuit breaker in “OFF” position. c. Mode selector switch in “OFF”’ position. a. Mode selector switch improperly positioned. b. Temperature   selector  switch  set incorrectly. c. Insufficient air passing over evaporator  coil. d. Too much outside air entering unit. e.  Insufficient  refrigerant  in  system. f. Evaporator fan speed switch set at low  speed. g.  Insufficient  air  passing  through condenser  coil. a. Mode selector switch improperly set. b. Temperature   selector  switch  set incorrectly. c. Insufficient air    movement    over heaters. column   shows   the the  second  column and   the   correcting the   operator   must   be maintenance. Corrective  Action a. Connect power cable to receptacle (fig. 2-3, sheet 1). b. Reset circuit breaker (fig. 2-3. s h e e t     1 ) . c. Turn selector switch knob to desired  operation  (fig.  2-3,  sheet 1). a. Set switch to “COOL” (fig. 2-.5). b.  Adjust  setting  to  “COOLER’”  (fig. 2-5). c. Open evaporator inlet louvers (fig. 2-4). Remove any obstructions from  evaporator  inlet  and  outlet louver (para 3-10). d. Close or adjust damper door (fig. 2-3, sheet 1). e. Check liquid sight indicator (para 3-12). f. Reset switch to high speed (fig. 3-2, sheet  1). g. Remove any obsturctions for condenser fan inlet and outlet (para  3-10).  Make  sure  louvers are open (fig. 2-3, sheet 3). a. Set switch to LOW HEAT OR HIGH HEAT (fig. 2-3, sheet 1). b. Reset switch (fig. 2-3, sheet 1). c.  Remove    any    Obstructions  from evaporator     air    intake    and discharge louvers (para 3-10). Make sure intake louvers are open (fig. 2-3. sheet 3). Section   V.   OPERATOR’S   MAINTENANCE   OF   AIR   CONDITIONER 3-9.  General 3-12.  Liquid  Sight  Indicator This  section  contains  maintenance  procedures  for Wipe refrigerant liquid sight indicator glass with a the  operator  of  the  air  conditioner. soft   clean   cloth.   Set   controls   at   cool-cooler   and 3-10. Louvers, Condenser Guard and Fresh Air operate  unit  for   15  minutes  before  observation. Screen Yellow  appearance  indicates  moisture  in  system Remove  any  obstructions.  Brush  off  loose  dirt  and and  bubbles  or  milky  flow  indicate  low  refrigerant charge.  Report  presence  of  these  conditions  to wipe  clean. direct  support  maintenance. 3-11.  Drains Clean   out   drain   openings   and   remove   any-   ob- structions. 3-3