26
CAUTION: The turnbuckles and door switch are
located in a heated zone. Care should be taken to
avoid burns.
D. 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 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 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.
DOOR SWITCH ACCESS PANEL
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 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 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.
To Next Page
Loading...
