A-A-54187A
2. While the ambient temperature is between 70°F and 80°F, and freezer temperature stabilized at minus 121°F, the empty freezer shall cycle at least once every 1/2 hour during a 4 hour period and temperature excursions shall not exceed 11°F.
NOTE: Compressor cycling shall occur at ambient temperatures of less than 90°F, while maintaining an internal temperature of minus 121°F.
3. With ambient temperature stabilized for 24 hours at 95°F plus or minus 2°F, relative humidity between 90 and 95 percent, empty freezer, there shall be no lid lock caused by frost build-up for the 24 hour test period and the temperature shall be minus 116°F or colder. During this test period, the freezer lid shall be opened every 4 hours for 60 seconds. Temperature may be warmer than minus 82°F for three minutes after closing. This test shall be performed 3 times once each for freezer empty, half full, and filled to capacity. DoD approved frozen red blood cell freezing containers filled with a fluid that mimics the heat transfer and capacity of red blood cell solutions shall be used. (The vendor shall supply these test materials.)
4. With conditions stabilized, ambient at 95°F plus or minus 2°F, cooling water temperature plus 85°F plus or minus 2°F, relative humidity at 90 to 95 percent, and full freezer chamber at minus 121°F, the unit shall maintain an internal temperature of at least minus 121°F for a period of 96 hours. Current draw shall not increase during the 96 hours.
5. The ambient air temperature shall be maintained at a minimum of 95°F. The full freezer shall be stabilized at minus 121°F. The line power to the freezer shall be shut off for a minimum of 24 hours, during which time the freezer lid shall be maintain the temperature of the freezer colder than minus 76°F for the entire test period. (The temperature shall be recorded at least every 15 minutes.)
Where a cascaded refrigeration system is used for backup, the freezer temperature shall be maintained at minus 121°F during the entire test period.
6. The units shall be tested for remote, local, and audio/visual alarm systems which alert the operator of any abnormal temperature in the freezer or, if power is disconnected. The alarm systems shall be activated when temperatures exceed the warm or cold limit points.
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