TM 9-4120-399-14
NOTE
Weather stripping, the installation of storm doors and windows (if
a p p r o p r i a t e ) , and insulation of surfaces exposed to the outside is
recommended when operation at extremely low temperatures for extended
periods is anticipated.
seriously reduce the efficiency of the air conditioner by clogging the air filters which will restrict
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 condensate trap and water drain lines. When operating the air conditioner in these
dusty and sandy conditions, perform the following steps.
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.
in unusually wet conditions, perform the following steps.
a. More frequent inspection and cleaning of the 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.
the same clogging problems as encountered when operating in a dusty or sandy environment.
In addition, the nature of salt presents serious corrosion problems.
