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W:\ELECTRICAL\MANUAL\BENCH\GENERAL INSTRUCTIONS\BENCHOVEN INS.8-18
7-5.3 Oven Body
7-5.3.1 Do not allow accumulation of combustible material or other foreign matter in
the work space, heat chamber (including heating elements) ductwork, air
inlets, exhaust outlets, control enclosures, motors, safety switches, 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 or melting with steam 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.
7-5.3.2 Do not allow accumulation of combustible material on work holders, drip
pans or on floor of oven.
7-5.3.3 Temperature control and excess temperature limit interlock thermocouples
or sensing bulb must be inspected periodically for damage. Location of
these cannot be changed.
7-5.3-4 Oven repair by cutting, welding or any other method that could produce a
source of ignition (spark) should be avoided and only then after all
combustible deposits have been removed.
7-5.4 Duct W ork
7-5.4.1 It is important oven ducts be kept clean. If they are subjected to a build-up
of flammable deposits of condensed solvent, oil vapors, 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.
Cleaning frequency should be determined by process requirements.
7-5.5 Lubrication
7-5.5.1 Electric motors having oil holes require lubrication after every 25,000 hours
or 3 years of light duty operation. Use a good grade of SAE 10 electric
motor oil or as recommended by the manufacturer of the motor.
7-5.6 Doors/Gaskets
7-5.6.1 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.
7-5.6.2 The door should be inspected for damage which would allow excessive
leakage of hot air. The gasket (Models NT and NTR only) should be
replaced when damaged or when an adequate seal cannot be maintained.
7-5.6.3 The door and associated spring loaded latches should be checked
periodically.
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