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TM 9-4120-389-14
2-17. OPERATION IN EXTREME COLD.
CAUTION
Do not disturb electrical wiring 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 -
15 deg. F (-45 deg. 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.
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 inspection of filters and all other areas of dust and sand accumulation. In extreme
conditions, daily cleaning of filters may be necessary. Contact Unit Maintenance to clean filters.
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