16. To shut down the oven: Press the oven stop button. The burner will shut down however the fans will continue to run until the oven cools to the “safe shutdown temperature set point” (usually around 160F). Once the temp falls below the safe shutdown set point, the fans will turn off. The touchscreen will display a prompt to alert the operator of the safe shutdown procedure. NEVER USE THE E-STOP TO SHUT THE OVEN DOWN UNLESS IT IS AN EMERGENCY OR IF THE TOUCHSCREEN IS DAMAGED AND NOT RESPONDING. DAMAGE TO THE FANS WILL RESULT. IF THE FANS STOP WHEN THE OVEN IS HOT (POWER FAILURE), EITHER RE-START THE FANS, OR OPEN THE DOORS TO ALLOW THE OVEN TO QUICKLY COOL. Detailed Sequence of Operation
“Oven Start” button is pressed. Exhaust fan(s) energizes then 4 seconds later the recirculation fan(s) energizes. If fans are running in correct rotation with no issues, proving switches will close.
Control panel checks gas valve train for proper pressure. If pressure is within range, and all air proving switches are made, purge timer begins.
After purge timer expires, and “Burner Enable” toggle switch is set to on position, control panel sends call for heat command to flame controller.
Flame controller confirms gas pressure is correct, blocking valve proof of closure is made, no flame is present, and combustion air is not made.
After all safety checks are complete, flame controller energizes combustion fan(s) and checks the combustion fan air proving switch.
After combustion air proving switch makes, the flame controller energizes the burner igniter.
After the burner igniter is on for approximately 3 seconds, the flame controller energizes the main gas valves.
Gas flows through the blocking valves and through the butterfly valve to the burner where it meets the igniter and air which allow a flame to propagate across the burner.
After approximately 10 seconds, the flame controller turns off the igniter then checks the signal from the UV scanner. If the signal is within range, the flame controller sends the “Burner On” signal to the PLC. After the PLC receives the burner on signal, it allows the gas actuator to modulate based on the signal from the oven temperature controller. At this time, the oven will begin to come up to the temperature set point displayed on the touch screen.
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