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Vulcan Hart Convection Oven Thermostat Valve Calibration
bytechtown
Convection oven temperatures need to stay consistent to properly function and cook food product correctly. However, sometimes an oven can get off temperature and be reading wrong. Below we are going to walk through Vulcan Hart convection oven thermostat valve calibration so you can get ovens at the right temperature.Â
Checking Average Temperatures
- Step 1. Place probe in oven – Place a thermocouple temperature probe in the center of the oven to check temperatures while calibrating.Â
- Step 2. Turn power on – Turn the power on.Â
- Step 3. Set temperature – Use the thermostat knob to set the temperature to 350°F. Let the oven cycle 3 complete times. If the oven is normally set to a different preferred temperature, you can calibrate to that temperature then.Â
- Step 4. Check burner flame – Observe and check the burner, making note of the temperature tester reading when the burner turns on and off.Â
- Step 5. Calculate average – Add the 2 temperatures together and divide the sum by 2 to get the average. If the average temperature is more than ±25°F of the set temperature then move on to calibration.
Convection Oven Thermostat Valve Calibration

- Step 1. Remove temperature knob – Pull off the temperature knob, making sure not to rotate it during removal.Â
- Step 2. Turn screw – While holding the outer shaft in place, turn the inner screw using a small, flat edge screwdriver â…› turn clockwise to decrease or counterclockwise to increase. ¼ of a turn is about 35°F, but make sure not to turn the screw more than â…œ of a turn or you may damage the thermostat.Â
- Step 3. Verify temperature – Check that the temperature is at 350°F and allow it to cycle 3 times. You need to let it cycle 3 times to stabilize the temperatures or the adjustment will be invalid.Â
- Step 4. Take temperature reading – Take a temperature reading. If the temperature is within range, continue to the next. If the temperature isn’t within ±25°F, then readjust. If 3 consecutive adjustments don’t get results, replace the thermostat and verify calibration.
- Step 5. Apply sealer – Apply a small amount of a non permanent sealer around the inner screw head to stop movement during outer shaft rotation. Wait for the sealer to dry then install the knob.Â
- Step 6. Verify temperature – For calibrating ovens at 350°F, verify that temperatures are at 400°F. For calibrations at specific temperatures, verify the temperature is above the preferred temperature. If the preferred temperature is 450°F, then calibrate at that temperature only.Â
- Step 7. Allow cycling – Allow the oven to cycle 3 times at the temperature setting. If the actual oven temperature isn’t within ±25°F of the setting, replace the thermostat and verify calibration.