Service Procedures And Adjustments; Temperature Control Calibration - Vulcan-Hart VC5ED Service Manual

VC5ED FULL SIZE ELECTRIC CONVECTION OVEN - SERVICE PROCEDURES AND ADJUSTMENTS

SERVICE PROCEDURES AND ADJUSTMENTS

TEMPERATURE CONTROL
CALIBRATION
this section require electrical test or
measurements while power is applied
to the machine. Exercise extreme
caution at all times and follow Arc Flash
procedures. If test points are not easily
accessible, disconnect power and
follow Lockout/Tagout procedures,
attach test equipment and reapply
power to test.
NOTE: The temperature control module has a
programmable offset that can be applied to the set
temperature. This can be adjusted in 5 degree
increments up to 20 degrees in either direction.
1. Place a thermocouple in geometric center of
oven cavity.
2. Remove RIGHT SIDE FRONT PANEL to view
back of temperature control board.
3. Turn oven on and set to 350° Fahrenheit.
4. Watch the red fault indicator. If light comes on
see TEMPERATURE CONTROL BOARD
FAULT INDICATOR for troubleshooting tips. If
light stays off go to next step.
5. Allow oven to stabilize (typically 3 cycles)
6. Record temperature when heat light goes off and
comes on for at least 2 cycles.
7. Calculate differential by subtracting temperature
when lamp goes out from temperature when
lamp comes on.
Differential = (Heat Lamp OFF - Heat Lamp ON)
• If differential is less than 20 degrees,
temperature control circuit is functioning
properly. If it is more than 20 degrees, turn off
oven and replace TEMPERATURE PROBE.
• Repeat CALIBRATION steps. Calculate average
temperature (Heat Lamp OFF temperature +
Heat Lamp ON temperature divided by 2).
Average = (Heat Lamp OFF + Heat lamp on divided
by 2)
• If Average is less than 10° Fahrenheit from dial
setting, thermostat is properly calibrated.
F45652 (0217)
Certain procedures in
Page 14 of 31
• If it is more than 10° Fahrenheit, then complete
following steps.
1. Remove temperature control knob.
Fig. 23
2. Press and hold both + (plus) and the –
(minus) buttons for 3 seconds.
NOTE: Power light will start blinking and display will
show current offset.
3. Push "+" or "-" button to increase or
decrease offset.
NOTE: Each press will change offset by 5 degrees.
NOTE: After 5 seconds of no activity controller will
automatically exit calibration mode.