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Page Title: Section IV OPERATING UNDER UNUSUAL CONDITIONS
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CAUTION TM  5-4120-387-14 Section IV OPERATING UNDER UNUSUAL CONDITIONS 2-15.  GENERAL The  air  conditioner  is  designed  to  operate  normally  within  a  wide  range  of  climatic  conditions. However,  some  extreme  conditions  require  special  operating  and  servicing  procedures  to prevent  undue  loading  and  excessive  wear  on  the  equipment. 2-16. OPERATION IN EXTREME HEAT NOTE Unit Preventive Maintenance Checks and Services (PMCS) should be performed  at  daily  intervals. a. General. The air conditioner is designed to operate in temperatures up to 120°F (49°C). Extra care should be taken to minimize the cooling load when operating in extreme high temperatures, b.  Protection. (1) Check all openings in the enclosure, especially doors and windows, to be sure they are tightly closed. Limit in and out traffic if possible (2) When appropriate, use shades or awnings to shut out direct rays of the sun (3) When possible, limit the use of electric lights and other heat producing equipment (4) Limit the amount of hot, outside air introduced through the fresh air damper to that essential for  ventilation. NOTE Weatherstripping,  the  installation  of  storm  doors,  and  windows,  if  appropriate, and insulation of Surfaces exposed to the outside iS recommended when operating  in  extremely  high  temperatures  for  extended  periods. c.  Cleaning. (1) Clean outside grilles, coils, filters, and mist eliminator more frequently 2-17. OPERATION IN EXTREME COLD Do not disturb electrical wrong that has been exposed to extremely low temperatures, Both the wire and insulation become brittle when cold and are easily  broken. The air conditioner is designed to operate in temperatures down to –50°F (-45°C). Extra care should be taken to minimize  the  heating  load  when  operating  in  extremely  low  temperatures  Some  of  the  steps  that  may  be  taken are: a. Check all openings in the enclosure, especially doors and windows, to be sure they are tightly closed. Limit in and out traffic, if possible. b. Open shades and awnings to permit entry of direct rays of the sun, if appropriate c. Limit the amount of cold, outside air introduced through the fresh air damper to that needed for  ventilation. NOTE Weather  stripping,  the  installation  of  storm  doors  and  windows  (if  appropriate), and insulation of surfaces exposed to the outside is recommended when operation at extremely low temperatures for extended periods is anticipated. Change   3 2-33

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