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

complete and accurate.

4.3.3.6.2.1 Electrical instruction plate inspection. Visually verify that type II refrigeration units have

an electrical instruction plate containing correct power source information located near the electric

supply junction box.

4.3.3.6.3 Control and gage nameplate inspection. Visually verify that all controls and gages have

nameplates.

4.3.3.6.4 Electrical wiring inspection. Visually verify that all wiring is marked to allow

identification with the wiring diagram on the instruction plates.

4.3.3.7 Interchangeability certification. The contractor shall certify that all component parts of the

refrigeration unit shall be interchangeable with the same parts of other units of the same type furnished

under the same contract.

4.3.4 Operating environment requirements verification. All operating environment requirements

shall be verified as follows.

4.3.4.1 Ambient temperature testing. All refrigeration units shall be tested for operation in high

temperature ambients as specified in 4.3.4.1.1. Type I refrigeration units shall also be tested for

operation in low temperature ambients as specified in 4.3.4.1.2.

4.3.4.1.1 High temperature operation test. The refrigeration unit shall be heat soaked for 6 hours at

an ambient temperature of 1250F minimum. With air entering and surrounding the condenser and the

condenser section maintained at 1250 F minimum, the unit shall be started and operated for 1 hour with

its control set at 400F, then shut off. Air velocity around the condenser section shall not exceed 100

feet per minute. After 2 minutes, the unit shall be restarted and operated for one hour with its control

set at 400F, then shut off. This procedure shall be followed for a total of 4 hours with the unit

continuing to operate.

4.3.4.1.2 Low temperature operation test. The type I units, complete with battery and fuel, shall be

placed in a temperature controlled room maintained at 00 F,+ 20F, for 12 hours. On completion of the

cold soak period, the unit shall be automatically started and operated for a period of 1 hour during

which time the cold room shall be maintained at 00 F + 150F.

4.3.4.2 Rainfall test. The refrigeration unit shall be mounted in a simulated container and fresh

water sprayed on the unit at no less than 3 inches per hour at an average downward angle of 45 degrees

to simulate rainfall on the exposed surfaces of the unit. The front, top, and two sides of the unit shall

be individually sprayed for 30 minutes while not operating. The refrigeration unit shall then be started

and operated for 30 minutes while the spray continues. A visual verification shall be done to insure no

leakage occurred in the evaporator section, electrical control or junction boxes, the food storage area of