LABOVENS.INS.7-18.wpd 15 of 23 07/18
7-4.3 Oven Body
7-4.3.1 Do not allow accumulation of combustible material or other foreign matter in
the work space, heat chamber (including heating elements) ductwork, air
inlets, vent outlets, control enclosures, door latches, and door hinges. Care
must be taken in cleaning any combustible build-up to avoid creating a
source of ignition (spark). Scraping with non-sparking tools is suggested.
Lint and dust should be removed by vacuum cleaning. Blowing with
compressed air or steam should be avoided if there is a possibility of
explosion from a combustible dust cloud.
7-4.3.2 Do not allow accumulation of combustible material on work holders, drip
pans or on floor of oven.
7-4.3.3 Temperature control and excess temperature control sensing bulb or bi-
metal must be inspected periodically for damage. Location of these cannot
be changed.
7-4.4 Duct Work
7-4.4.1 It is important ovens be kept clean. If they are subjected to a build-up of
combustible deposits of dust or other combustible debris they must be
periodically cleaned. The build-up of condensed vapors or combustible
debris is a major cause of fires.
7-4.5 Doors/Gaskets
7-4.5.1 The oven doors should be inspected regularly to see that latches are
holding the door firmly and uniformly against the oven providing a maximum
sealing force.
7-4.5.2 The door should be inspected for damage which would allow excessive
leakage of hot air. The gasket (applicable to LR-271C only) should be
replaced when damaged or when an adequate seal cannot be maintained.
7-4.5.3 The door and associated spring loaded latches should be checked
periodically.
7-4.6 Temperature Control
7-4.6.1 Run oven at predetermined setting and compare temperature at
thermometer to previous tests. Significantly higher temperatures could
indicate temperature controller is failing.
7-4.7 Location
7-4.7.1 The user is responsible to determine that facility changes in the vicinity of
the oven have not created a hazardous condition. Specifically, the oven
should be protected from external heat, vibration, mechanical hazards and
corrosive environment.
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