MIL-PRF-83990A
3.6.4 Forced Air Circulating System. The oven shall have a forced air circulating system to
circulate air within the Type II oven. The motor for the system shall have adequate thermal and
over-current protection. The assembly shall be statically and dynamically balanced.
3.6.5 Dielectric strength. The electrical system insulation, excluding control and recording
instruments, shall be capable of withstanding without damage an impressed voltage of 1,000 volts
plus twice the rated voltage without breaking down and shall register a resistance value of not less
than one megohm at 500 volts DC. The dielectric strength shall apply between all insulated
circuits and external oven parts.
3.6.6 Undervoltage protection. Undervoltage protection shall be provided in accordance with
NFPA 86D to remove power from the oven in the event of power failure. The oven shall not
restart until it is manually reset.
3.6.7 Lock-out tag-out protection. Walk-in type ovens shall have provisions to isolate and
lock out all sources of hazardous energy to ensure the safety of maintenance personnel.
3.7 Nameplate. A corrosion and weather resistant nameplate shall be securely attached to the
oven. The nameplate shall include:
Contract number
National stock number
Manufacturer's name
Manufacturer's model
Manufacturer's serial number
Power input characteristics
Maximum operating temperature, °F
4. VERIFICATION
4.1 Classification of Inspections. The inspection requirements specified herein are classified
as follows:
a. First article inspection (see 4.2).
b. Quality Conformance inspection (see 4.3).
4.2 First article test. Unless otherwise specified (see 6.2), one oven shall be subjected to first
article testing. Testing shall consist of the examination in paragraph 4.4 and the testing in
paragraph 4.5. Failure of the first article test oven to pass any examination or test shall be cause
for rejection.
4.3 Quality conformance inspection. Quality conformance inspection shall be performed on
each item prior to being offered for acceptance under the contract. Quality conformance inspection
shall consist of the examinations in 4.4 and the tests in 4.5 as specified by the procuring activity
(see 6.2). Failure of the oven to pass the examination or any specified test shall be cause for
rejection.
4.4 Examination. The oven shall be examined to verify the following:
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