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TM5-4120-376-14 d.  Mode  Selector  Switch.  The  mode  selector  switch  is  an  electrical  switch  that  can  be manually  positioned  to  select  the  desired  operational  mode  of  the  air  conditioner.  The  five positions  of  the  mode  selector  are: (1)  Off.  The   off   mode   position   is   used   to   stop   operation.   All   major   electrical   components are   isolate   from   electrical   power   except   the   compressor   crankcase   heater,   which   is thermostatically  controlled  as  long  as  input  power  is  connected  to  the  unit. (2)  Vent.  In  the  vent  mode  position,  the  evaporator  motor  operates  and  the  fans  circulate filtered  air.  Ventilation  air  will  be  drawn  into  the  unit  through  the  fresh  air  filter  and  vent  duct if  the  damper  door  in  the  vent  duct  is  open.  Some  cooling  effect  will  occur  if  the  ventilation air   is   cold.   Ventilation   air   flow   is   controlled   by   opening   and   closing   the   damper   door   with   the vent   adjusting   knob. (3)  Cool.  In  the  cool  mode  position,  the  refrigerant  cycle  begins,  and  the  unit  will  cool. Ventilation  air  will  be  drawn  into  the  unit  if  the  vent  damper  door  is  open. (4)  Low  Heat.  In  the  low  heat  mode,  the  evaporator  fan  motor  operates  continuously  and three  of  the  six  heater  elements  are  activated.  The  three  heater  elements  cycle  on  and  off under   thermostatic   control   of   the   temperature   selector   switch.   This   mode   will   produce   half   of the   unit's   heating   capability.   Ventilation   air   will   be   drawn   into   the   unit   if   the   vent   damper   door is  open. (5)  High  Heat.  In  the  high  heat  mode,  the  evaporator  fan  motor  operates  continuously and   all   six   of   the   heater   elements   are   activated,   but   only   three   of   the   heater   elements   will   cycle on  and  off  under  thermostatic  control  of  the  temperature  selector  switch.  This  mode  will produce   maximum   heating   capability   of   the   unit.   Ventilation   air   will   be   drawn   into   the   unit   if the  vent  damper  door  is  open. e.  Evaporator  Fan  Speed  Switch.  The  evaporator  fan  speed  switch  has  two  positions,  “low” and   “high”.   The   positions   are   manually   selected   to   control   the   evaporator   fan   speed   in   all operating   modes.   Normally   the   “low”   speed   should   be   selected   as   it   is   quieter   and   requires   less electrical  power;  however,  the  “high”  speed  position  has  three  advantages  over  “low”  which  may dictate  its  selection: (1)  Maximum  cooling  capacity  can  only  be  achieved  in  “high”. (2)  The  increased  flow  of  evaporator  air  improves  air  distribution  in  the  conditioned space. (3)  Twice  as  much  ventilation  air  is  drawn  into  the  unit  in  “high”. f.  Ventilation  Knob.  The  ventilation  knob  controls  the  flow  of  ventilation  air  into  the  unit. The  knob  is  connected  by  the  damper  cable  to  a  damper  located  in  the  vent  duct.  The  knob controls   the   flow   of   ventilation   air   by   adjusting   the   position   of   the   damper   from   full   closed   to full  open.  Turning  the  knob  to  the  right  closes  the  damper,  turning  the  knob  to  the  left  opens the   damper.   When   ventilation   air   enters   the   air   conditioned   space   a   like   flow   of   air   must exhaust   from   the   space   to   prevent   a   pressure   buildup.   Cracks   in   the   space   may   be   sufficient; but  if  a  large  flow  of  ventilation  air  is  desired,  some  positive  means  of  air  exhaust  should  be provided. g.    Return  Air  Louver.    The  return  air  louver  is  finger-adjustable  from  full  open  to  full  closed. Normally   the   louver   shutter   tab   adjustment   is   kept   at   45   position,   which   is   essentially   the same  as  a  full  open  return  air  louver.  If  the  return  air  louver  is  closed,  return  air  will  still 2-2

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