MIL-PRF-53047B
3.3.2.4 Fuel tank. The fuel tank shall have the capacity to hold enough fuel to operate the
chiller for a minimum of six hours, at continuous rated output, under full load. The fuel tank shall
be located in a manner that prevents fuel spillage or overflow from contacting the exhaust or
electrical systems or is hazardous in operations specified herein.
3.3.2.4.1 External source. When permissible (see 6.2), the unit may meet the six-hour-
operation requirement through utilization of an external source of fuel supply. The sub-system
provided shall pump and filter fuel from a standard, 5-gallon, military, fuel can, in accordance with
MIL-PRF-53109, without interruption in operation of the unit to switch cans. The sub-system
shall not require manual priming to start and shall be inherently safeguarded against spillage and
dissipation of fumes.
3.3.2.5 Drainage. The drainage systems for engine fluids shall not permit fluid discharge onto
components of the water chiller. The engine oil drain shall be readily accessible from the exterior
of the unit, and shall be provided with a captivated closure.
3.3.3 Water pump. The water pump shall be a pump which will not affect the potability of the
water.
3.3.3.1 Priming. The pump shall be self priming when the engine is operating at idle and at
optimum speed. The pump shall operate without fuel at least 30 seconds without compromising
operational performance.
3.3.3.2 Operation. The water pump shall have the capability to pump water from a potable
water source, run the water through a cooling process, and dispense the water into containers.
3.3.4 Cooling unit. The cooling unit shall be sized to provide the cooling capacity required to
meet the performance requirements as specified herein.
3.3.4.1 Refrigeration system. The cooling unit refrigeration system shall be able to be used
with potable water without affecting the potability and designed and fabricated in accordance with
standard practices and safety considerations. The refrigerant shall be a non-ozone-depleting type
(R124a, R134a) operating in a sealed system. The sealed system shall not degrade sufficiently to
impair operation of the unit, under any of the storage or operational conditions specified. The
system shall be constructed so that leakage from the system shall not be greater than 0.1 ounce
per year, except at the shaft seal which shall be permitted a 1.0 ounce per year maximum rate.
3.3.4.2 System indicators. The cooling unit shall have pressure and thermal switches that
activate fault indicators to visually indicate system problems. The system shall be equipped to shut
down the water chiller when the switch is activated (see 3.7.2). After the problem which caused
the shutdown is resolved, the indicators/switches shall be capable of reseting to the condition they
were in during system operation.
3.3.5 Electrical system. All electrical system components for the unit shall meet NFPA 70
requirements. Electrical system components shall not be adversely affected by engine heat. All
electrical components shall be water resistant and designed or located so that their functioning
shall not be impaired by heavy rain, road splash, condensation, or water spray resulting from other
internal or external causes. Wires and cables shall be positioned or protected to avoid contact
with abrasive surfaces or other damaging contacts.
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