A-A-54187A
air-water cooling. The cooling systems’ designs shall allow sufficient reserve capacity to maintain an internal chamber operating temperature of at least minus 121°F or colder with air cooling for ambient air temperature of 95°F plus or minus 2°F, or with water cooling for water temperature of 85° plus or minus 2°F. For systems which use air cooling, the air inlets to the refrigeration condensers shall be equipped with removable filters, with capability to be cleaned with soap and water and reused continuously.
Door lid. The freezer shall be supplied with magnetically sealed door lid gasket(s) constructed with material which remains flexible an usable at the expected internal temperatures in use. The freezer shall have a minimum of three movable or removable sublids constructed of Lexan or equal. Sublids shall allow access to part of the contents without exposing the entire contents to ambient conditions when the freezer is opened. The freezer lid shall be counter balanced or strutted to hold any position from closed to fully opened with a maximum movement force of ten pounds in either direction.
Anti-icing. The unit shall be supplied with anti-icing to the extent that it will prevent freezer lock of the freezer door lids and of the contents of the freezer when the unit is operated in a 95°F plus or minus 2°F, 95 percent relative humidity plus or minus 5 percent at sea level atmospheric pressure. In these ambient conditions, opening the lid fully for 60 seconds plus or minus 2 seconds, every 4 hours for a 24 hour period, shall produce no frost build-up or freeze-lock of doors (outside lid or inner sliding doors) or contents with a full, half-full, or empty freezer. Formation of non-adhering ice crystals is acceptable.
Door locks. The freezers shall be provided with two (2) cam actuated locking mechanisms with one padlock and key for each cam lock. The two cam locks shall be located on the front of door lid and freezer, from 1/4 to 1/3 of the freezer lid length from each end of the lid. The lock mechanism shall permit key removal in either locked or unlocked position.
Temperature indicating devices. A digital temperature indicator shall be provided to indicate shall be provided to indicate freezer chamber temperature (for Type I). Indicated temperature shall be within plus or minus 5°F of actual temperature. The indicator shall be line powered and backup battery powered to enable continuous temperature indication even during power failure.
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