MIL-DTL-23581B(SH)
4.3.3.7 Overall construction and performance. The drying tumbler shall be tested to determine conformance to
the following requirements:
a.
Timer
-
0 to 80 minutes operation (see 3.6.14.3.2).
b.
Cooldown
-
Automatic to 135 °F (see 3.6.14.3.2)
or
Last 5 minutes of timer operation (see 3.6.14.3.2).
c.
Thermostat
-
120 to 185 °F operation (see 3.6.14.3.1).
d.
Temperature display
-
Operation (see 3.6.14.3.1).
e.
Door interlock
-
De-energizes cylinder drive motor when loading door is opened (see 3.6.3).
f.
Door
-
Configuration adequate to retain clothing within the cylinder (see 3.6.3).
4.3.3.8 Power input. Motors shall not draw in excess of rated current after accelerating to full speed.
4.3.3.9 Insulation. The insulation resistance of each motor, electric component and connecting cable shall be
measured by a 500-volt direct current insulation resistance tester. Insulation resistance of each component shall be
not less than 10 megohms.
4.3.3.10 Surface and handle temperature test. Each exterior surface of the drying tumbler shall be divided into
6- by 6-inch equal areas on each panel. Areas less than 18 inches squared should be combined with the adjoining 6-
by 6-inch area. Areas equal or greater than 18 inches squared shall be treated as a full 6- by 6-inch area. Surface
temperatures shall be measured at the center of each area, and the areas explored for the maximum temperature. The
temperatures of all exterior surfaces contacted by the operator shall also be measured (e.g., handles, latches,
controls, etc.) Temperature measurements shall be taken by a calibrated indicator potentiometer connected to a J or
K type thermocouple. The drying tumbler shall be loaded with test loads as specified in 4.3.3.6. Each test load shall
be dried at the maximum temperature and for the maximum time. Just before the thermostat functions off for the
third load, temperature readings shall be taken. The ambient air temperature for the test shall be between 65 and 75
°F (see 3.6.12).
4.3.3.11 Limiting devices. A thermocouple shall be mounted in the exhaust outlet. For the tests specified
herein, the drying tumbler indicator light shall be used to indicate when the heating elements are energized (ON) and
de-energized (OFF) during the tests. The drying tumbler shall be placed into operation at the maximum temperature
setting with a full test load as specified in 4.3.3.6. The thermistor temperature controller shall cycle the heating
elements ON when the temperature falls not greater than 10 °F below the maximum temperature setting and shall
cycle the heating elements OFF at the maximum temperature setting. After one full operation at the maximum
temperature setting, the drying tumbler shall be placed into operation at the maximum temperature setting with a full
test load as specified in 4.3.3.6. The drying tumbler shall be placed into failure of primary drying thermostat
operational condition until the heating elements are automatically de-energized by the safety thermostat. The time
and thermocouple temperature at which the drying tumbler heating elements are de-energized shall be recorded.
Record the time and thermocouple temperature at which the safety thermostat automatically energizes the heating
elements following their automatic shutdown. The thermocouple temperature shall not exceed 205 °F during any
part of the test runs. Upon conclusion of each test, a visual inspection of the test load shall be conducted. The test
load shall be free of any scorching damage.
4.4 Conformance inspection. Conformance inspection shall consist of the examinations of 4.4.2 and the tests
of 4.4.3.
4.4.1 Lot. For the purpose of quality conformance inspection and test sampling, a lot is defined as all the
machines of one type, produced in one facility, using the same material and production processes, and being offered
for delivery at one time.
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