Duke E SERIES Manuale di installazione, funzionamento, ricambi e manutenzione - Pagina 11
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C. Thermostat Calibration
In many convection ovens thermostats have been the
cause of more operating problems than any other
component part. Thermostats, being mechanical
devices, do sometimes fail, in which case only
replacing the part will correct the problem.
To Check Calibration
• Turn the oven on by turning the Power Switch
to the ON position.
• Open the doors and place a thermocouple in the
center of the middle oven rack. A reliable
mercury-type thermometer can be substituted if a
pyrometer is not available.
•
Turn the thermostat dial to 350°F (177°C).
Allow the oven to preheat 1/2 hour.
• When the indicator light goes out, the
thermostat has been satisfied. Check the
pyrometer or thermometer to determine the
internal oven temperature.
• If the reading on the pyrometer (or
thermometer) is less than 10°F different from the
setting of the thermostat, no adjustment is
needed. If this reading is more than 10°F,
proceed with calibration procedure.
However, the great majority of thermostat related
problems can be attributed to their being out of
adjustment (calibration). A thermostat that is out of
calibration may cause unsatisfactory cooking results
such as uneven baking, prolonged cooking times, etc.
If you are experiencing uneven cooking, it may be a
result of excessive cooking temperatures. Refer to the
cooking chart provided in Operating Instructions
Section C.
:
To Calibrate the Ovens
• Remove the thermostat knob by loosening the set
screw and pull the knob forward. Take care not to
rotate the thermostat stem, which will change the
setting.
• With a very small screwdriver, turn the screw
located in the bottom of the hollow of the stem
clockwise
to
counterclockwise to raise the temperature. DO NOT
allow the stem of the thermostat to rotate as you turn
the screw.
• Open the door and turn the POWER SWITCH to the
COOL DOWN position. This will allow the oven fan
to come on without the burners and cool off the oven.
Allow the oven to cool to about 250°F (120°C).
•
Return
the POWER SWITCH to the ON position
and repeat the previous steps until the oven
thermostat and the pyrometer (thermometer) reading
agree.
• Replace the knob and tighten the set screws.
CAUTION: Maximum turn of screw "A" is 1-1/2 turns -
clockwise or counter-clockwise.
This thermostat is a direct-acting (opens or "breaks" circuit of
temperature rise) device.
11
lower
the
temperature
or