2-8. UNUSUAL ENVIRONMENTAL/WEATHER. (Continued)
(2) When possible, use shades or awnings to prevent direct sunlight from hitting the shelter or air conditioner.
(3) Limit the use of electric lights and other heat producing equipment.
(4) Limit the amount of hot, outside air introduced through shelter vents and louvers to that required for
b. Operation in Extreme Cold. When operating the air conditioner in temperatures down to -25F (-32C), extra
care should be taken to minimize the heating load. Some precautions that may be taken are:
If operation in extremely low temperatures for extended periods of time is anticipated, it is
recommended that weather stripping and door/window seals be repaired or replaced prior to
deployment. If possible, insulation of the shelter should be performed.
Ensure all openings in the enclosure, especially doors and windows are tightly closed. Limit in and out
traffic, if possible.
Expose shelter and air conditioner to direct sunlight if possible.
(3) Limit the amount of cold, outside air introduced through shelter vents and louvers to that required for
ELECTRICAL SHOCK or DEATH will result if power is supplied to equipment while rinsing. DO NOT
rinse air conditioner while power is connected or equipment is in operation.
c 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. More frequent PMCS and rinsing surfaces of condenser with fresh water may prevent
corrosion problems (refer to paragraph d). Refer to paragraph 1-3 for reporting of corrosion problems.
d Operation in Dust storms or Sandstorms. Dusty and sandy conditions can seriously reduce the efficiency of
the air conditioner by clogging the air filter and restricting the volume of airflow, resulting in high pressure
problems. Accumulation of dust or sand in the condenser coil and/or in the HMMWV compartment may cause
overheating of the refrigeration system. Dust or sand may also clog the condensate water drain line. When
operating the air conditioner in dusty or sandy conditions, perform the following steps:
Frequent cleaning or changing of the evaporator filter and all other areas of dust and sand accumulation.
In extreme conditions, daily cleaning or changing of the filter may be necessary.
Limit the amount of dusty or sandy outside air introduced through shelter vents and louvers to that
required for ventilation.