Vulcan-Hart VC5GD Service Manual page 29

FULL SIZE GAS CONVECTION OVEN - ELECTRICAL OPERATION
F. Oven cavity temperature below 140°F.
2. Set temperature control dial to desired
temperature.
3. Power switch (S1) turned ON.
A. Component cooling fan energized.
B. Power ON light (Amber) comes ON.
NOTE: Power is available to oven light switch to turn
oven cavity lights ON when light switch is turned ON;
and power is available to normally open (N.O.)side of
door switch contacts and connects power to additional
components when door switch contacts are CLOSED
(door closed).
4. Transformer (T1) energized.
A. Power (24VAC) to one side of the following
components: high limit --- connected
through normally closed (N.C.) contacts to
First valve (safety) on the dual solenoid gas
valve.
1) 1st valve (safety) on gas valve
energized.
NOTE: Gas does not flow to the burner until Second
valve (main) is energized.
B. With door switch closed, power is applied to
motor speed (Hi/Low).
1) Power is connected through function
switch (S3) contacts and convection
fan motor is energized (fan speed hi).
2) Power to normally open (N.O.) side of
internal relay contacts on temperature
control board.
3) When convection fan motor reaches
operating speed, the centrifugal switch
(N.O.) on motor closes.
4) Solid state temperature control
energized. If the oven temperature is
below set point, the temperature
control will energize its internal relay.
The normally open (N.O.) contacts
close and apply power to the following
components:
a. Heat light (clear) comes ON.
b. Power is connected through the
centrifugal switch contacts on the
convection fan motor, heat relay is
energized, contacts (N.O.) close
and the heating circuit is powered.
c. Ignition control module is
energized.
5. Oven reaches set temperature.
A. Temperature control de-energizes internal
relay and the normally open (N.O.) contacts
OPEN.
1)
2)
6. Oven will continue to cycle on temperature
control until doors are opened or power switch
(S1) is turned to OFF or COOL DOWN position.
Timer Cycle, Cooking
NOTE: "Cook" timer operates independently of
heating cycle. Additional time can be set or timer can
be turned OFF throughout cooking cycle.
1. With power switch turned ON, power is supplied
to "Cook" timer terminal 1.
2. Set "Cook" timer to desired time.
A. Contacts 1 & 3 close, timer motor is
energized and timing "down" begins.
3. Time expires on "Cook" timer.
A. Contacts 1 & 3 open, timer motor is de-
energized and timing stops.
B. Contacts 1 & 4 close.
1)
NOTE: The buzzer continues to sound until the timer
dial is set to the OFF position or additional time is set.
Cool Down Cycle
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d. Second valve (main) on gas valve
is energized. Gas starts to flow to
burner, sparking begins, the
burner lights. Sparking continues
for up to 7 seconds or until a flame
is established. If a flame is
"sensed", the "no ignition" light
stays out and burner remains lit. If
a flame is not "sensed" after 7
seconds of sparking, "no ignition"
light comes on, Second valve
(main) on the gas valve is de-
energize and gas flow to burner
stops. Ignition trial cycle repeats
after a 15 second purge between
cycles for two additional tries
before locking out. To reset after
a lockout, turn power switch (S1)
OFF then ON.
Heat light goes out.
Power removed from heat relay.
a. Power removed from Second
valve (main) on gas valve and gas
flow to burner stops.
Buzzer energized and sounds.
F45598 (0616)