Section IV. OPERATION UNDER UNUSUAL CONDITIONS
2-15. OPERATION IN EXTREME COLD (BELOW 0 F).
In extremely cold weather, if the rear doors remain open for a long period of time, the
door seals become hard and brittle. The rear doors will be difficult to close and the seals
will be damaged. Warm seals before closing rear doors doors.
To warm the rear doors seals during extremely cold weather, proceed as follows:
(1) Start generator set (TM 5-6115-585-12/34) or external power source (power source manual).
(2) Start refrigeration unit and operate in heating mode (TM 9-4110-252-14).
(3) Close rear doors as much as possible without compressing door seals. Do not close door release handles.
(4) Allow refrigeration unit to operate in heating mode until doors seals warm up. When warm, doors seals will
be soft and flexible.
To prevent damage to rear door seals, keep doors closed during extremely cold weather.
Open only for loading or unloading.
(5) Close rear doors.
(6) Refer to TM 9-4110-252-14 for operation of the refrigeration unit in extreme cold.
(7) Refer to TM 5-6115-585-12/34 for operation of the generator set in extreme cold.
2-16. OPERATION IN EXTREME HEAT.
Observe the following precautions when operating the refrigerated container in extreme heat:
(1) If possible, keep container out of direct sunlight. Shade container with a tarp or similar type cover.
(2) Do not block air circulation around refrigeration unit. Keep area clear of equipment and other obstructions.
(3) Periodically inspect refrigeration unit condenser coils. Coils must be kept clean. Refer to TM 9-4110-252-
14 for cleaning instructions
(4) Periodically inspect refrigeration unit evaporator coils (inside container). If frost becomes 1/8 to 1/2 inch
thick before unit defrosts, perform manual defrosting of refrigeration unit (TM 9-4110-252-14).
(5) Refer to TM 9-4110-252-14 for operation of the refrigeration unit in extreme heat.