TM   5-6115-323-14 A   rotary-type    control,  it  is  used  to  control  the output voltage of the generator set. 2-2. Operation Under Usual Conditions a. General. (1)  The   instructions   in   this   paragraph   are published  for  the  information  and  guidance  of personnel  responsible  for  operation  of  the  genera- tor  sets. (2) The  operator  must  know  how  to  perform every  operation  of  which  the  generator  sets  are capable.  This  section  gives  instructions  on  start ing and stopping the generator sets and regulat- ing  them  to  perform  the  specific  task  for  which the  equipment  is  designed. WARNING Operation  of  this  equipment  presents  a noise   hazard   to   personnel   in   the   area. The   noise   level   exceeds   the   allowable limits   for   unprotected   personnel.   Wear ear  muffs  or  ear  plugs  which  were  fitted by  a  trained  professional. b. Starting. (1) Preparation for Starting (a) (A, F, N, MC) Perform the daily preven- tive maintenance checks and services (Table 3-2). (b) Check  the load  cable  connections,  posi- tion  arrow  on  knob  of  variable  resistor  so  it  points UP, set the load switch (S1) on the AC unit or the circuit breaker (CB) on the DC unit in the  OFF position. (c) On the AC unit only, remove the cover of the control box and see that the voltage change switch (S2) is in the desired position (120 or 240 volts),  Install  the  cover. (b) Position  the  fuel  selector  valve  in  posi- tion   for   either   the   on-set   tank   or   for    an  auxiliary fuel    supply. (2) Starting.  Refer to figure 2-2 and start the engine. c. Operation. Position the load switch (AC Unit) (A, fig. 2-3) or circuit breaker (DC Unit) in the ON position  and  turn  the  knob  of  the  variable  resistor to  set  the  output  voltage  to  the  proper  value, either 120 volts or 240 volts AC, or 28 volts DC. d. Stopping. (1) (2) (3) Set    the    circuit    breaker/load    switch    to OFF    position. Turn   the   voltage   adjusting   rheostat   all the  way  to  the  left. Run   the   generator   set   at   rated   speed   for three   to   five   minutes   to   cool   down   the set. (4) Move   the   engine   RUN   switch   to   OFF. Section Il. OPERATION OF AUXILIARY EQUIPMENT 2-3. Heating Torch Description CAUTION The  heating  torch  is  a line, pump-type torch. It engine  to  a  point  where operate   freely. l-pint (.47 liters), gaso- Move heating torch continuously while is  used  to  preheat  the heat is being applied. This will prevent the  moving  parts  will damage to the engine crankcase from overheating any single spot thereon. Do not apply direct heat or flame to the nylon fuel tank, fuel lines, and fuel filter 2-4. Heating Torch Operation system. Operate the heating torch as shown by figure 2- NOTE The  heating  torch  should  be  applied  at  the   apera- 4. tures  (four  on  each  side)  beneath  both  sides  of  the engine. 2-4 Change 1