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Figure 2-9. Air conditioner stopping instructions.
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CHAPTER  3 OPERATOR/   CREW   MAINTENANCE   INSTRUCTIONS
Section   V.   OPERATION   UNDER   UNUSUAL   CONDITIONS 2-12.  Operation  in  Extreme  Cold Caution:  To  start  unit  on  “cool”  mode  at  O°F ambient   (   min.   operating   temp),   jumper   LPCO switch  (S-5). a.  General.   The   air   conditioner   is   designed   to operate   on the   heating   cycle   in  ambient  t e m - peratures   as  low  as  minus  50°  F  (Fahrenheit)  and on   cooling   cycle   with   O°F   air   entering   the   con- denser  and  70°  F  air  entering  the  evaporator. b.  Before   Operation.   Before   starting   on   cooling cycle   be   sure   cover   is   removed   from   condenser   air intake   and   discharge.   Clear   all   ice   and   snow   from openings.    Be  sure  all  dampers  are  in  operating condition. c.  After  Operation.   Install   cover   over   condenser air   intake   and   discharge   openings. Caution:  Do  not  disturb  wiring  during  cold weather   unless   absolutely   n e c e s s a r y . Cold temperatures make   wiring and    insulation brittle   and   easily   broken. 2-13.   Operation   in   Extreme   Heat a.   General   The  air  conditioner  is  designed  to operate   satisfactorily   at   temperatures   up   to   plus 120°F.   If   unit   is   operated   at   condenser   inlet temperatures higher   than 120°F,   the   cooling capacity   will   be   lowered   and   long   periods   of operation at   extended   temperatures   may   cause condenser   or   condenser   fan   motor   to   overheat   and trip   their   internal   overload   switches   or   the   high pressure  cut  out  switch  will  shut  the  unit  off. b. Filters.  To  maintain  the  highest  capacity  of  the unit,  the  return  air  filter  and  fresh  air  screen  should be  cleaned  weekly  or  more  often  if  necessary.  Dirty filters   reduce   the   flow   of   air   across   the   evaporator coil,   thereby   reducing   the   capacity   of   the   air conditioner. c.  Guards   and   Louvers.  Keep   all   guards   and louvers   clean   and   free   of   any   obstructions   to maintain   full   air   flow   through   the   air   conditioner. d. Coils.  Clean  evaporator  and  condenser  coils  as frequently   as   necessary   to   prevent   dirt   or   other matter  from  obstructing  the  air  flow. 2-14.   Operation   in   Dusty   or   Sandy   Areas a.   Protection.   Shield  the  air  conditioner  from dust  as  much  as  possible.  Take  advantage  of  any natural  barriers  which  offer  protection. b.  Cleaning.   Keep  the  air  conditioner  as  clean  as possible.   Pay   particular   attention   to   the   louvers, filters,   coils,   electrical   components   and   grilles.   Use compressed   air,   if  available,  to  aid  in  cleaning. c.  Air  Filters   and   Coils. (  1   )   Under   extremely   dusty   or   sandy   con- ditions,  the  louvers,  filters,  coils,  electrical  com- ponents   and   grilles   must   be   serviced   more   often. Note.   Never   operate   the   unit   without   having   the   air filters  in  place. ( 2 ) The  condenser  coil  is  subjected  to  ambient air.  Therefore,  it  requires  cleaning  more  often   than the   evaporator   coil. 2-15.   Operation   Under   Rainy   or   Humid   Con- ditions Take   special   precautions   to   keep   equipment   dry.   If installed   outdoors,   cover   the   equipment   with   a waterproof   cover   when   it   is   not   in  use.   R e m o ve cover   during   dry   periods.   Take   all  necessary precautions  to  keep  the  electrical  components  free from   moisture. Caution:   Make  sure   power   is   disconnected f r o m    a i r    c o n d i t i o n e r    b e f o r e    t o u c h i n g    a ny wiring   or   other   electrical   parts. 2-16.   Operation   in   Salt   Water   Areas a.  General.   Wash   the   exterior   and   condenser section   of   the   unit, particularly   condenser   air discharge   louver   control   mechanism,   with   clean fresh  water  at  frequent  intervals.  Be  careful  not  to damage   electrical   system   with   water.   Special   at- tention  must  be  given  to  prevent  rust  and  corrosion. W a r n i n g :   Disconnect   power   source   prior to   washing   the   air   conditioner. b.  Painting.   Paint   all   exposed   areas   where   paint has  cracked,  peeled,  or  blistered  or  report  condition to  organizational  maintenance.  Coat  all  exposed areas  of  polished  metal  with  a  light  coat   of  grease. 2-13

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