Oven Checkout & Adjustments; Thermostat Calibration (Old & New Styles); Thermostat Dial Plate Calibration (New Style) - Market Forge Industries 4200 Owner's Manual

Electric compact convection oven
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OVEN CHECkOUT & ADJUSTMENTS:
Door Adjustment (Old Style):
The door was properly adjusted at the factory,
if door does not open or close properly adjust
the ball plunger catch as .follows:
1.
1. Remove adjusting wrench from back of
manual and insert in notches on sides of
ball plunger.
2.
Loosen jam nut with wrench.
3.
Turn adjusting wrench left or right until ball
plunger engages in door striker plate for
best operation.
4.
Tighten jam nut with wrench while adjust-
ing wrench is still engaged in notches.
5.
Return adjusting wrench to back of man-
ual.
THERMOSTAT CALIBRATION
(OLD STYLE):
The thermostat is a device which automati-
cally limits heat input at or below the dial set-
ting.
Before attempting to calibrate thermostat,
make sure that the thermostat is the cause
of problems experienced. Check for improper
electrical service, incorrect mixes over and
under proofing, incorrect temperatures, and
warping pans. Thermostats are calibrated
and sealed by the original manufacturer be-
fore leaving their plant. Only a qualified ser-
vice person should make calibration adjust-
ments, if they become necessary.
CALIBRATE ELECTRONIC THERMOSTAT
( NEW STYLE ):
1.
Set oven thermostat knob at 350°F.
2.
Allow oven to preheat to 350°F.
3.
Observe temperature with digital ther-
mometer.
4.
If temperature goes above 350°F turn set
pot labelled HI (on circuit board) counter-
clockwise. % turn should be sufficient.
5.
Allow time for oven temperature to drop,
then recheck temperature.
6.
If temperature is below 350°F turn set pot
labelled HI (on circuit board) clockwise.+/-
5°F turn should be sufficient.
INSTALLATION
7.
8.
THERMOSTAT DIAL PLATE CALIBRATION
(
NEW STYLE
1.
2.
3.
4.
5.
6.
7. Record the temperature when the ele-
8. If the temperature differs more than +/-
4
Repeat steps 4 to 7 until oven tempera-
ture stabilizes at 350°F+/- 5°F
Apply Glyptol or Duco Cement to set pot
to prevent rotation.
):
Clamp thermocouple sensor in the center
of the middle rack in compartment.
Pass the thermocouple sensor wire
through the door gasket and close the
door.
Plug the sensor lead into the pyrometer.
Set the oven power switch to ON.
Set the thermostat knob to 3500 (191°C).
Allow the oven to warm up for a minimum
of (3) three ON/OFF cycles.
Fig. 3
ment indicator light goes off. If a tempera-
ture of 345°-355° is attained, no calibra-
tion is necessary .
5°F from the dial setting:
Pencil mark the knob pointer position as a
reference point on the control panel next
to the dial plate
Loosen the dial plate mounting screws
only enough to move the plate.
Move the dial plate until calibration match-
es thermometer reading (350°F).

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