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2) If output voltage from the internal relay
is correct proceed to step 8. If output
voltage from the internal relay is not
correct, check temperature probe as
outlined under TEMPERATURE
PROBE TEST (SOLID STATE
CONTROL).
8. Set the temperature control to the minimum
setting.
NOTE: Oven temperature must be above 300°F.
9. Check for zero (0) volts AC across terminals
OUTPUT RELAY terminal (right side) to 120 VAC
or OUTPUT RELAY terminal (right side) to
208-240 VAC for no output from the internal
relay.
A. If correct, temperature control is functioning
properly.
B. If incorrect, check temperature probe as
outlined under TEMPERATURE PROBE
TEST (SOLID STATE CONTROL).
1) If temperature probe is OK:
a. Turn the power switch OFF.
Disconnect the
electrical power to the machine and
follow lockout / tagout procedures.
b. Replace the temperature control
and check calibration as outlined
under
SOLID STATE
TEMPERATURE CONTROL
CALIBRATION.
TEMPERATURE PROBE TEST
(SOLID STATE CONTROL)
Disconnect the
electrical power to the machine and
follow lockout / tagout procedures.
NOTE: The temperature probe used in conjunction
with the Solid State Temperature control is an RTD
(resistance temperature detector) of the Thermistor
type. As temperature increases the resistance value
decreases.
1. Remove the RIGHT SIDE - FRONT PANEL.
NOTE: If right side panel is not accessible, this
component can be serviced by removing CONTROL
PANEL.
2. Place a shielded thermocouple in the geometric
center of the oven cavity and determine the
temperature in the oven cavity.
3. Remove the probe lead wires from the solid state
temperature control.
4. Test the probe with an multimeter.
A. If the measured resistance values are inside
the given tolerance then the probe is
functioning properly.
B. If the measured resistance values are
outside the given tolerance then replace the
probe and retest.
1) Check oven for proper operation.
5. Reverse procedure to install.
TEMP (°F) OHMS * TEMP (°F) OHMS *
77 90,000 360 822
240 4,077 380 656
260 3,016 400 529
280 2,266 425 424
300 1,726 450 334
320 1,332 475 266
340 1,041
* Resistance in ohms ± 10%
SOLID STATE TEMPERATURE
CONTROL CALIBRATION
Calibration Steps
1. Place a thermocouple in the geometric center of
the oven cavity.
2. Set the ON / OFF / OVEN COOL switch to ON.
3. Set the temperature controller dial to 350°F.
4. Allow the oven temperature to stabilize
(minimum three heating cycles).
5. Record the temperature at which the Heat lamp
comes ON (heating starts) and goes OFF
(heating stops). This is the control differential.
Heat lamp OFF temp - Heat lamp ON temp =
Control Differential.
6. The nominal control differential should be less
than 20°F.
VC3ED FULL SIZE ELECTRIC CONVECTION OVEN - SERVICE PROCEDURES AND ADJUSTMENTS
Page 15 of 31 F45534 (0415)