Duke 59 Series Installations- und Betriebshandbuch - Seite 19
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MAINTENANCE INSTRUCTIONS - continued
C. THERMOSTAT CALIBRATION
Electro-Mechanical Controls Only ("Q" & "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.
NOTE: 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.
Installation and Operation of 5/9 Electric Convection Oven
Dial Shaft "B"
Rotation Screw "A"
1/4
turn
Increase
Decrease
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