MIL-PRF-53047B
3.4 Performance characteristics.
3.4.1 Unit operation. The water chiller shall operate at an optimum speed for a minimum of
six continuous hours without shutdown or operator intervention, and at angles of up to 15
degrees from horizontal in any orientation. After a continuous six-hour, full load, operating
period, the water chiller shall restart within 30 minutes and operate as specified.
3.4.2 Water chiller. Within five minutes of start, the water chiller unit shall accept 121 ±1 °F
input water and shall dispense it cooled to 62 ± 8 °F, at a rate of not less than 40 gallons per
hour. The unit shall perform the same operation with water at 62 ± 8 °F.
3.4.3 Transportability. The water chiller shall withstand impact forces encountered in
commercial and military shipment without damage or permanent deformation. The unit shall be
provided with slinging and tiedown provisions in accordance with MIL-STD-209. Provisions
shall restrain and/or lift the unit in its operating orientation without damaging the water chiller.
3.4.3.1 Survivability. Mounted onto the host vehicle, the water chiller shall survive transport
under all the following conditions:
a. On improved roads at speeds up to 50 mph
b. On unimproved roads at speeds up to 20 mph
c. Cross-country at speeds up to 20 mph.
d. Belgian Block at speeds up to 20 mph
3.5 Environmental.
3.5.1 Operational temperature. The water chiller unit shall start and operate as specified at
any ambient temperature between 70 °F and 120 °F.
3.5.2 Storage. The water chiller shall not be damaged or sustain operational degradation by
storage at any ambient temperature between -25 °F and 160 °F. If system drainage is used to
meet this requirement drains shall be readily accessible.
3.5.3 Humidity. The water chiller shall not sustain deterioration, corrosion, or other changes
that will have a negative impact on the operation or maintenance of the unit, from exposure to
humidity from 0 to 100%.
3.5.4 Rain. The water chiller shall not sustain deterioration, corrosion, or other changes that
will have a negative impact on the operation or maintenance of the unit, from exposure to free
rain fall at four inches per hour or blowing rain falling at one inch per hour.
3.5.5 Sand and dust. The water chiller shall not sustain deterioration, corrosion, or other
changes that will have a negative impact on the operation or maintenance of the unit, while in
25 mph blowing dust and sand.
3.5.6 Noise limits. Steady-state noise produced by the chiller shall not exceed 85 decibels on
the A scale (dB(A)), for sustained exposure. If remedial procedures for noise suppression have
been pursued to the satisfaction of the procuring activity and permission to exceed 85 dB(A)
including prorated values specified in Occupational Safety and Health Act regulations (OSHA
2201) is obtained, then hazard sign(s) shall be provided. The sign(s) shall conform to ANSI Z
535.2 and be prominently displayed on the unit, visible from any angle of approach. At a
minimum, each sign shall state "HEARING PROTECTION REQUIRED WITHIN (specify)
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