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26
SECTION 3
OPERATION
WARNING
OVEN MUST BE KEPT CLEAR OF
COMBUSTIBLES AT ALL TIMES.
III. STEP-BY-STEP OPERATION
Control Panel (On split belt ovens, two conveyor speed
controls are mounted on the control panel.)
A. Startup Procedures
Initial Startup
Check that the full-flow gas shutoff valve is “on”.
This valve is located outside the rear of the oven. See
Figures 2-3, 2-4, and 2-5.
Daily Startup
1. Turn the BLOWER switch (Figure 3-6) to the “ON” or “I”
position. This starts the main blower fan and the cooling
fan. The blower circulates air through the air fingers and
must stay on during the cooking or baking process.
2. Check to see if the cooling fan (see Figure 1-8) is
operating when the blower switch (see Figure 3-6) is turned
“ON” or “I”. The cooling fans cool the control components
and burner blower motor. The cooling fan, located at the
rear of the electrical control cabinet blows air into and
through the cabinet. Air is exhausted through the front of
the cabinet and also out the front of the oven. Refer to Daily
Maintenance Section for fan intake checking procedure.
IMPORTANT NOTE
The cooling fan operates when the BLOWER
switch is turned “ON” or “I”. It must operate to keep
the control console below 140°F (60°C).
3. Turn the CONVEYOR switch (Figure 3-6) to the “ON” or
“I” position. This starts the conveyor belt moving through
the oven. Set the conveyor speed for the desired baking
time. Refer to the following Procedures E, F and G.
4. Set the temperature controller to the desired baking
temperature. See section on bake times to determine
desired temperature.
NOTE: For complete temperature controller operation
instructions refer to Step C.
5. Turn the HEAT switch (Figure 3-6) to the “ON” or “I”
position. This completes a circuit to supply electric power
to the burner. When an oven that has not been in operation
for approximately 1/2 hour is turned on, it goes through a
30-second purge cycle. The burner blower motor will not
operate during the time the blower fan is purging the oven.
After 30 seconds, the burner blower motor starts, which
can be detected by feeling a slight vibration when touched.
This permits the burner to light.
When in operation, the burner is either on low or high flame.
Its flame-sensing electrode must be satisfied to keep the
bypass and gas valves open. If for some reason the
bypass flame is extinguished, the burner tries to relight for
90 seconds. If the burner flame does not relight in 90
seconds, the oven goes into automatic safety lockout.
To relight the oven, turn the HEAT switch to “OFF” or “O”
for 5 minutes. Then, repeat the Oven Startup procedure.
6. Close front window.
7. Oven will reach a baking temperature of 600°F (315°C)
in approximately 10 minutes. Allow the oven to cycle for
30 minutes after it has reached desired bake temperatue.
The oven is now ready for baking.
Power Failure
In case of power failure, turn off all switches; open oven
window and remove product. After power has been
reestablished follow normal startup procedure.
CAUTION
The burner will not operate and gas will not flow
through the burner without electric power. No
attempt should be made to operate the oven
during power failure.
B. Shutdown Procedure
1. Turn the BLOWER and HEAT switches to “OFF” or “O”.
NOTE: The blowers will remain on until the oven tempera-
ture cools down to 200°F (93°C) at which time they will stop
automatically.
2. Make certain that there are no products left on the
conveyor inside the oven. Turn the CONVEYOR switch
to “OFF” or “O”.
3. Turn off the main gas supply valve.
4. Open the oven window.