MIL-PRF-44466 Heater, Water And Ration \(Hwr\)This specification covers one type of heater for use by mounted troops that will heat rations, water for beverages and for limited personal hygiene \(see 6.1\).

Pages 1 - 2 - 3 - 4 - 5 - 6 - 7 - 8 - 9 - 10 - 11 - 12

MIL-PRF-44466D

TABLE II. Verification test sequence cont'd

Test Sequence

Requirement Paragraph

Characteristic

Verification Paragraph

Electromagnetic

4.3.5.6

3.5.5

compatibility

3.2.6.2

Automatic shutdown

4.3.2.8

3.4.1

Reliability

4.3.4.1

3.5.6

Vibration

4.3.5.7

4.3 Verification methods. Verification methods can include visual examination, measurement,

testing, simulation, modeling, engineering evaluation, component properties analysis, certification

and similarity to previously-approved or previously-qualified designs.

4.3.1 Verification alternatives. The contractor may propose alternative test methods,

techniques, or equipment, including the application of statistical process control, tool control, or

cost-effective sampling procedures to verify performance (see 6.4).

4.3.2 Operating requirements verification. Complete each verification in section 4.3.2.

4.3.2.1 Temperature selection settings verification. The HWR shall be connected to a 24/28

Volt DC power supply at an ambient air temperature of 700F. One-half gallon of water at

approximately 700F shall be added to the main container. The temperature selection switch shall

be set to the low temperature setting for 2 hours. Verify the water temperature to be 1550F +

50F. Repeat above test at the high temperature setting and verify the water temperature to be

1850F + 50F.

4.3.2.2 Heating water test. The HWR shall be connected to a 24/28 Volt DC power supply at

an ambient air temperature of approximately 700F. One gallon of water at approximately 400F

(T1) shall be added to the main container. The temperature selection switch shall be set to the

high temperature setting for 1 hour. Upon completion of 1 hour, the unit shall be shut off and the

temperature of the water taken (T2). Verify that T2-T1 > 1000F.

4.3.2.3 Heating rations test. The HWR shall be connected to a 24/28 Volt DC power supply

at an ambient air temperature of 700F. Forty ounces of water at approximately 700F shall be

added to the main compartment and 5 MREs with any water necessary for convection shall be

placed into the inner container. Set the temperature selection switch to the high temperature

position. At 5-minute intervals the external surface temperature of the HWR and the MRE's

temperature shall be taken and recorded. A surface temperature < 1200F and an MRE

temperature of 1850F + 50F shall be verified.