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SECTION 3
OPERATION
II. OPERATION
A. Start Up Procedures -- Gas Heated Ovens
Initial Start Up
1. Check that manual gas shutoff valve is on. Valve is
located below machinery compartment. See Figure 2-12.
Daily Start Up
1. Turn blower switch to the on (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 fans (see Figures 1-4 and
1-6) are operating when the blower switch is turned on (I).
The cooling fans cool the electrical components and
burner blower motor. The cooling fan, located at the rear
of the machinery cabinet blows air into and through the
cabinet. Air is exhausted out the back of the oven. A
cooling fan is also located in the bottom of the control box
to draw air through the rear louvers and out the bottom.
Clean the cooling fan grills and louvers daily.
IMPORTANT NOTE: The cooling fan will operate when
the blower switch is turned on (I). It must operate to keep
the machinery cabinet below 140°F. (60° C.).
WARNING: IF FAN BLADE IS NOT ROTATING, BRO-
KEN OR IF FAN ASSEMBLY IS MISSING FROM MAIN
BLOWER MOTOR SHAFT, DO NOT OPERATE OVEN.
REPLACE COOLING FAN BLADE BEFORE OPERAT-
ING OVEN. Serious damage could be done to the burner
blower motor and/or the solid state electrical compo-
nents if oven is operated while cooling fan is not running
or vent grill is plugged.
3. Turn the conveyor switch to the on (I) position.
This now starts the conveyor belt moving through the
oven. Set conveyor speed digital control for desired bake
time .
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.
4. The temperature controller should be set at your
desired baking temperature. See section on bake times
to determine desired temperature.
NOTE: For complete temperature controller operation
instructions refer to Step B.
5. Turn the heat switch to the on (I) position. This will
complete a circuit which supplies power to the burner.
When an oven that has not been in operation for approxi-
mately 1/2 hour is turned on it goes through a 15 second
purge cycle. The burner blower motor will not operate
during the time the main fan is purging the oven. After 15
seconds the burner blower motor starts, which can be
detected by feeling a slight vibration when touched. This
should permit the burner to light.
When in operation, the burner is either on low or high
flame. A flame sensing electrode must be satisfied to
keep the pilot and gas valve open. If for some reason the
pilot flame is extinguished, the pilot will try to relight for 90
seconds. If the pilot does not relight in 90 seconds the
oven will go into automatic safety lockout.
To relight the oven the heat switch must be turned off
for 5 minutes and then repeat the oven start-up proce-
dure.
6. Close front window.
7. Oven will reach a baking temperature of 500° F (260°
C) in approximately 10 minutes. Allow the oven to cycle
for 30 minutes after it has reached desired bake tempera-
ture and 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 start-up procedure.