ARMY TM 9-4120-380-14
AIR FORCE TO 35E9-136-21
Weather stripping, the installation of storm doors and windows
(if appropriate), and insulation of surfaces exposed to the
outside are recommended when operating. In extremely low
temperatures for extended periods is anticipated .
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.
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 airflow volume.
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. One of the
steps that may be taken is frequent cleaning of filters and all other areas of dust and sand accumulation. In
extreme conditions, daily cleaning of filters may be necessary.
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 inspections and cleaning of the condensate trap and drain lines to insure proper drainage and to
prevent accumulation of water inside the cabinet.
b. Cover the condenser air inlet and outlet on the back of the cabinet during periods of wet windy weather when the
air conditioner is not in operation.
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.
2.21 OPERATIONAL UNDER EMERGENCY CONDITIONS.
Power conservation. During periods when full 208 volt, 3-phase power is in critically short supply, and if the air
conditioner cannot be turned off completely, it should be operated in AUTO mode only.
Chemical. biological. radiological (CBR) hazard. Should it be necessary to operate in conditions requiring use
of CBR filtration equipment. see specific instructions for your shelter or facility installation. The fresh air inlet should be
closed. The opening should be covered with a suitable material and scaled airtight.