TM 5-4120-270-15 Section IV.  OPERATION OF EQUIPMENT 2-10. General a. The instructions in this section are published for the information and guidance of personnel responsible for operation of the air conditioner. b. The   operator   must   know   how   to   perform every operation of which the air conditioner is capable.      This   section   gives   instructions   on   starting, stopping,   and   operating   details   of   the   air   conditioner. Since    nearly    every    application    presents    a    different problem, the operator may have to vary given procedure to  fit  the  individual  job.  Operating  control  settings  are listed in table 2-1. Table 2-1.  Operating Control Settings 2-11. Starting a. Perform daily preventive maintenance services (pars 3-6). b. Refer  to   figure   2-,   and   start   the   air   con- ditioner. c. If  the  air  conditioner  fails  to  start,  remove cover on lower front panel and reset the circuit breaker. Caution:   Wait   5   minutes   before   restarting   the unit after operation. d. Refer  to  table  21,  and  adjust  air  condition- er for desired mode of operation. 2-12. Stopping Refer to figure 2-4, and stop the air conditioner. 2-13. Air Conditioner Operation Refer to figure 25, for instructions on operation of the air conditioner. 2-14. Operation In Extreme Cold a. General.  The air conditioner is designed to operate at a maximum low temperature of -650F, (Fahrenheit).    Be  sure  that  all  thermostatic  controls  and dampers are in working order. b. Electrical System.  Make sure the electrical system is free of ice and moisture. Caution:  Do  not  disturb  the  wiring  during  cold weather unless absolutely necessary. Cold temperatures make wiring and insulation brittle and easily broken. 2-15. Operation In Extreme Heat a. General.  The air conditioner is designed to operate satisfactorily at temperatures up to 1256F. b. Ventilation.      Allow   sufficient   room   around the air conditioner for adequate air circulation. Note.  Do not  restrict  the  flow  of  air  at  the  intake  and  discharge openings of the unit. 2-16. Operation in Dusty or Sandy Areas Clean  the  condenser  coil  and  evaporator  coil  weekly  or more  often  if  necessary.    Clean  the  mist  eliminator,  air conditioning  filter,  fresh  air  inlet  screen  and  condenser screen daily. 2-5