MIL-PRF-62550/2B(AT)
NOTES:
1. Personnel heater must be in accordance with performance specification MIL-PRF-62550,
Type II, Class II.
2. Unless otherwise specified, dimensions are in millimeters (mm). Tolerances are ±1.50 on
decimals, and ±1° on angular dimensions.
3. Combustion air inlet shall be rotatable to any angle within a minimum range of 290°
lockwise from point X.
4. Mounting tabs attached to the 198 - 205.0 mm diameter for the controls cover may
exceed the envelope by no more than 26 mm.
5. Combustion air inlet may be any shape so long as it conforms to the specified
dimensions.
6. Ventilation air intake may be anywhere in the heater envelope above the 38 mm strap
space.
7. No fasteners or raised, sharp edges are allowed in the strap space areas. The diameter for
these areas shall be between 200 and 205 mm.
8. A diameter of 200 to 202 mm shall be maintained for 18 mm starting from the opposite
end from the combustion air inlet.
9. Referenced documents shall be of the issue in effect on the date of invitations for bid.
10. Interpret according to ASME Y14.5.
11. This is a critical item.
12. Diameter excluding areas specified by Notes 7 and 8.
13. Opening in controls cover must be at least 25 mm wide and allow not less than 13 mm
access space about the centers of the fuel inlet and air bleed.
14. As long as the remaining drawing requirements are met, fuel inlet and air bleed valve are
not required to be within the controls cover.
15. As long as Notes 7 and 8 and the remaining drawing requirements are met, screw heads
shall protrude above the heater surface by no more than 4.0 mm.
16. External by-pass optional.
Custodians:
Preparing activity:
Army - AT
Army - AT
(Project 2540-2011-002)
NOTE: The activities listed above were interested in this document as of the date of this
document. Since organizations and responsibilities can change, you should verify the currency
of the information above using the ASSIST Online database at https://assist.daps.dla.mil.
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