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W:\ELECTRICAL\MANUAL\BENCH\GENERAL INSTRUCTIONS\BENCHOVEN INS.8-18
7-5.7 Fans
7-5.7.1 Tighten set screws between fans and motor shaft before operating and
check periodically.
7-5.7.2 Periodically inspect and clean fan wheels to remove any build-up of
deposits on the blade surfaces.
7-5.8 Contactors
(Note: Some temperature controllers and excess temperature limit interlocks
control the current to the heating elements directly. In these cases, contactors
will not be present.)
7-5.8.1 Temperature controller should cycle main contactor (if present) only.
Separate (back-up) contactor should not cycle.
7-5.8.2 Excess temperature limit interlock should open both main contactor and
separate (back-up) controller.
7-5.9 Temperature Controls
7-5.9.1 Heat oven to operating temperature and check oven temperature at control
point against a separate reliable temperature indicator to make sure
temperature controller calibration is correct.
7-5.9.2 Heat oven above maximum operating temperature and make sure excess
temperature limit interlock shuts down oven heat.
7-5.9.3 On temperature controllers and excess temperature limit interlocks with
thermocouples, disconnect one side of thermocouple connection to confirm
upscale break protection is operative.
7-5.10 Location
7-5.10.1 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.
7-5.10.2 Processes involving flammable liquids or creating explosive vapor or
combustible dust clouds must not be located near the oven.
7-5.10-3 Portable fire extinguishers located in the vicinity of the oven must be
inspected periodically.
7-5.10.4 Fire suppression system installed in the oven should be periodically tested.
All sprinkler heads in oven and duct work should be periodically inspected
and cleaned.
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