Section Il. MOVEMENT TO A NEW WORKSITE 24. Dismantling for Movement a. General. (1)  Turn   off   electrical   power   supply   to   air conditioner  and  disconnect  power  cable  from  unit. (2)   Disconnect   drain   hose   from   unit   (if used) . Note. Disconnect duct work, CB filter and remote con- trol cable, if used. (3)   Unbolt   unit   from   mounting   surface. b.    Short    Distance    Movement.    Lift   unit   at   base with    a    forklift    or    carry    unit    to    new    worksite Section Ill. CONTROLS 2-6.  General This  section   describes,   locates,   illustrates,    and provides   the   operator,   crew,   or   organizational maintenance personnel sufficient information about   the   various   controls   and   instruments   to   en- sure   proper   operation   of   the   air   conditioner. Refer   to   figure   2-5   for   location   and   operation   of controls   and   instruments. 2-7.   Controls   and   Instruments a.  General.   The   purpose   of   the   controls   and   in- struments   and   the   normal   indication   of   the   in- struments  are  illustrated  in  figure  2-5. b. High-Pressure Cutout     Switch. The high- pressure   cutout   switch,   located   at   the   top   rear   of the   air   cpmdotopmer   (fig.   2-5B),   senses   discharge line pressure    from   the   refrigerant   compressor and    will    cut    out    at    445    (±10)    psig.    This    action stops   operation   of   the   compressor   and   condenser fan   motor.   When   the   line   pressure   has   reduced   to 400   psi,   the   high-pressure   cutout   switch   can   be reset   by   pushing   the  reset  button. c.  Low-Pressure   Cutout   Switch.   The   low-pres- sure   cutout   switch,   located   at   the   top   rear   of   the air   conditioner   (fig.   2–5B),   senses   suction   line pressure   to   the   refrigerant   compressor   and   will cut  out  at  7   (±5)    psig.    This    action    stops    opera- tion   of   the   compressor   and   fan   motor.   When   the line    pressure    has    increased    to    12    psi,    the    low- pressure   cutout   switch   can   be   reset   by   pushing the  reset   button. d.   Liquid   Line   Sight   Glass.   The   sight   glass   (fig. 2-2B)   gives   a   visual   indication   of   the   dryness   of the refrigerant system. Normal indication is green   and   clear   of   bubbles.   Moisture   in   the   refrig- erant   system   is   indicated   by   the   indicator   turning from  green   to   chartreuse   (caution)   to   yellow (wet).   A   shortage   of   refrigerant   in   the   system   is indicated   by   bubbles   in  the  sight  glass. e.  Two-Speed  Condenser  Fan  Selector  Switch. 2-6 using  handles  at  sides   of   unit.   Keep   unit   vertical. c.   Long   Distance   Movement.    Crate   the   air   con- ditioner, p r o v i d i n g    a d e q u a t e    p r o t e c t i o n    f r o m     grilles   and   control   panel.   Refer   to   TM   38–250   for crate   fabrication.   Provide   suitable   blocking   and tiedowns    to     prevent unit from shifting transfer.   Keep   unit   vertical. 2-5.   Reinstallation   After Reinstall   the   air   conditioner agraph  2–3. AND INSTRUMENTS Movement as   instructed during in   par- The   two-speed   fan   switch   (fig.   2–5D)   provides the   user   the   option   of   selecting   either   HI-SPEED or   LO-SPEED   air   circulation.   When   the   switch   is placed   in   the   HI-SPEED   position,   the   fan   speed will   remain   constant   until   the   unit   is   either   shut down   or   the   switch   placed   in   the   LO-SPEED   po- sition.   An   increase   in   compressor   discharge   pres- sure   to   400   (±16)   psig   will   actuate   the   normally open   pressure   switch   (S3),   causing   the   switch   to close  and  the  fan  speed  to  increase  to  HI-SPEED. When   the   discharge   pressure   drops   to   350   (±16) psig,   the   pressure   switch   (S3)   contacts   will   re- turn   to   normally   open   and   the   fan   speed   will   re- turn   to   LO-SPEED. f. Rotary   Selector  Switch.   The  operation  of  the air   conditioner   is   controlled   by   the   rotary   selector switch  located  on  the  control  panel  (fig.  2–5D).  It has  five  positions: Hi-HEAT,   LO-HEAT,   OFF, VENTILATE,   and   COOL.   When   the   switch   is placed  in  the  HI-HEAT  position,  the  fan  motor  is actuated   and   all   six   heater   elements   are   placed   in operation.   Moving   the   selector   switch   to   the   LO- HEAT   position   presents   the   same   control   se- quence   but   reduces   the   heating   capacity   by supplying   power   to   only   three   heater   elements. When   the   switch   is   in   the   OFF   position,   all   cir- cuits   beyond   the   switch   are   open.   The   VENTI- LATE   position   turns   on   the   fan   motor   to   circulate the  air  in  the  conditioned  space,  in  the  COOL  posi- tion,  the  fan  motor  and  compressor  motor  are  op- erating  to  deliver  cool  air  at  the  selected  tempera- ture. g.  Thermostat.   The   thermostat   located   on   the air   conditioner   control   panel   (fig.   2-5D)   is   man- ually   set   to   the   desired   temperature   control   point in   an   operating   range   of   40°   F   to   90°   F.   Clock- wise   rotation   calls   for   warmer   air   and   counter- clockwise   rotation   for   cooler   air.   The   selected temperature  is  automatically  maintained  within  2 ( ± 1 ) ° F.