Duke Manufacturing Co.
2305 N. Broadway
•
St. Louis, Missouri
800-735-3853
•
314-231-1130
•
Fax 314-231-5074
www.dukemfg.com
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mounted to the door's hinge pin with a setscrew.
•
Open the doors fully.
•
Remove the lower cover by loosening the four
screws located inside the door opening.
•
Position the doors so they are nearly closed but
not latched.
•
To adjust the cam loosen the setscrew and rotate
the cam until you hear the switch click.
•
Tighten the setscrew in the cam. Test the door to
make certain the switch will make contact with
the doors closed.
•
Replace the combustion cover.
CAUTION: The door turnbuckles and door
switch are located in a heated zone. Care
should be taken to avoid burns.
D. Thermostat Calibration
Electro-Mechanical Controls Only (“V”). Not applicable
to Ovens with Solid State Controls.
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. However, the great majority of
thermostat related problems could 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 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.
To Calibrate the Ovens
•
Remove the thermostat knob by loosening the setscrew
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 lower
the temperature or 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 setscrews.
CAUTION: Maximum turn of screw "A" is 1-1/2
turns - clockwise or counter-clockwise.
This thermostat is a direct-acting (opens on temperature rise)
device.
Combustion Compartment Cover
