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Page Title: OPERATION IN DUSTY OR SANDY CONDITIONS
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TM  5-4120-377-14 2-18.  OPERATION  IN  DUSTY  OR  SANDY  CONDITIONS Dusty and sandy conditions can seriously reduce the efficiency of the air conditioner by clogging the air filters and thereby causing a restriction of the volume of airflow. Accumulation of dust or sand in the condenser coil and/or  in  the  compressor  compartment  may  cause  overheating  of  the  refrigeration  system.  Dust  or  sand  may also clog the mist eliminator, condensate trap, and water drain lines. Some of the steps that may be taken are: a.  Frequent  cleaning  of  filters  and  all  other  areas  of  dust  and  sand  accumulation.  In  extreme  conditions, daily  cleaning  of  filters  may  be  necessary. b.  Limit  the  amount  of  dusty  or  sandy  outside  air  introduced  through  the  fresh  air  damper  to  that  essential for   ventilation. c.  Roll  down  and  secure  the  fabric  cover  on  the  back  of  the  cabinet  during  periods  of  shut-down. 2-19.  OPERATION  IN  UNUSUALLY  WET  CONDITIONS The  air  conditioner  is  designed  for  normal  exposure  to  the  elements,  so  it  is  reasonably  waterproof.  Some  of the  steps  that  should  be  taken  in  an  extremely  wet  climate  are: a.  More  frequent  inspection  and  cleaning  of  the  mist  eliminator,  condensate  trap,  and  drain  lines  to  insure proper  drainage  and  prevent  accumulation  of  water  inside  the  cabinet. b.  Roll  down  and  secure  the  fabric  cover  on  the  back  of  the  cabinet  during  periods  of  wet,  windy  weather when  the  air  conditioner  is  not  in  operation. c.  Roll  up  and  secure  the  fabric  cover  during  dry  spells  when  the  air  conditioner  is  not  in  operation  so  that the  interior  can  dry  out  and  condensation  will  not  accumulate. 2-20. OPERATION IN SALT AIR OR SEA SPRAY Salt  air  or  sea  spray  may  cause  many  of  the  same  clogging  problems  as  encountered  when  operating  in  a dusty  or  sandy  environment.  In  addition,  the  nature  of  salt  presents  serious  corrosion  problems.  Frequent cleaning  is  necessary  during  which  all  exposed  surfaces  should  be  thoroughly  spray  rinsed  or  sponged  with fresh  water  to  remove  salt. The fabric cover on the back of the cabinet should be rolled down and secured during all periods when the air conditioner  is  not  in  operation. 2-24

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