MIL-PRF-13312 Refrigeration Units, Mechanical, Panel Mounted, 10,000 Btu For Refrigerator, Prefabricated, Panel TypeThis document covers two types of panel mounted, mechanical, refrigeration units having a capacity of 10,000 British thermal units \(Btu\) per hour and used with the prefabricated, panel type refrigerator \(see 6.1\).

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MIL-PRF-13312R

3.3.3 Refrigeration capacity. Refrigeration units shall have minimum net capacities of 10,000

Btu/hr at a thermostat setting of 00F and 18,000 Btu/hr at a thermostat setting of 350F.

3.3.4 Defrost system. Refrigeration units shall have a defrost cycle automatically initiated by a

time control adjustable between 6 and 24 hours and producing not less than 10 pounds of condensate

within 30 minutes.

3.3.5 Moisture content. The moisture content of the refrigeration system shall be kept at a

minimum to maintain proper operation of the refrigeration unit.

3.3.6 Refrigerant leakage. Refrigerant containing components shall be gastight.

3.3.7 Operation time. Type I refrigeration units shall operate for a minimum of 44 hours without

refueling.

3.3.8 Design reliability. Refrigeration units shall operate properly for 2500 hours.

3.3.9 Ozone-depleting substances. The refrigerant shall be commercially available nonozone-

depleting, and environmentally safe. Class I ozone-depleting substances, as determined by the

Environmental Protection Agency, shall not be contained in, and shall be prohibited from use during

the fabrication of, the refrigeration units (see 6.6).

3.3.10 Temperature control. The selected temperature of the refrigeration units shall be controlled

automatically. The temperature control shall allow an incremental selection of normal refrigerator

temperatures.

3.3.11 Diesel engine. Unless otherwise specified for type I refrigeration units (see 6.2), the diesel

engine's electrical system shall operate on 12-volt direct current (DC). The engine shall operate on

diesel and JP-8 fuels.

3.3.12 Compressor. Unless otherwise specified for type II refrigeration units (see 6.2), the

compressor shall operate on 208/230 volt, 3-phase, 60-hertz (Hz) and 3-phase, 50-Hz power on the

voltage specified in the contract or order (see 6.2).

3.3.13 Safety. The refrigeration units shall minimize flammability, operational, toxic and

personnel hazards.

3.4 Ownership and support requirements. Refrigeration units shall meet the following

requirements.

3.4.1 Weight. The net weight of the refrigeration units, including oil and refrigerant, shall be not