Vulcan-Hart VC4G Service Manual page 50

VC4G & VC6G SERIES FULL SIZE CONVECTION OVENS - ELECTRICAL OPERATION
1) Heat light goes out.
2) Power removed from heat relay (R3).
a. R3 normally open (N.O.) contacts
OPEN.
a)
5. The oven will continue to cycle on the
temperature control until the doors are opened or
power switch (S1) is turned to the OFF or COOL
DOWN position.
Timer Cycle (Normal Roast Cooking)
NOTE: The ROAST timer (normal cooking) operates
independently of the heating cycle. Additional time
can be set or the timer can be turned OFF throughout
the cooking cycle.
1. With the power switch turned ON, power is
supplied to timer.
A. Set ROAST timer to desired time (normal
cooking).
B. Contacts 1 & 3 close, timer motor is
energized and timing "down" begins
2. Time expires on ROAST timer (normal cooking).
A. Contacts 1 & 3 open, timer motor is de-
energize and timing stops.
B. Contacts 1 & 4 close.
1) Buzzer energized and sounds.
NOTE: The buzzer continues to sound until the timer
dial is set to the OFF position or additional time is set.
Roast and Hold Cycle
NOTE: Refer to the Installation and Operation Manual
for a detailed explanation of ROAST & HOLD cooking.
1. Conditions.
A. Oven connected to correct voltage.
1) L1 (HOT) to power switch (S1).
2) L2 (NEUTRAL or SECOND LINE) to
one side of the following components:
power ON light, heat light, temperature
control board terminal 9 (120VAC) or
terminal 10 (208- 240VAC), oven
cavity lights, buzzer, ROAST timer
motor (normal cooking), ROAST &
HOLD timer motor, heat relay coil (R3),
convection fan motor common (C),
transformer primary (T1), motor speed
(Hi/Low) relay coil (R1), hold relay coil
(R2) and the component cooling fan.
F24682 Rev. D (1016)
Power removed from 2nd
valve (main) on the gas valve
and gas flow to the burner
stops.
B. Oven properly grounded.
C. Gas supply valve ON.
D. Gas combination control valve ON.
E. Power switch (S1) OFF.
F. Function switch (S3) set to ROAST & HOLD
cycle.
G. Oven light switch (S2) ON/OFF (position
has no affect on the function of the ROAST
& HOLD cycle).
H. Temperature control dial set to lowest
temperature (fully counterclockwise).
I. High limit switch CLOSED.
J. Cook timer (normal cooking) in the OFF
position.
K. Cook and Hold timer in the OFF position.
L. Oven doors Closed.
1)
M. Oven cavity temperature below 140°F.
2. Set temperature control dial to desired ROAST
then Hold temperature (Roast & Hold cooking)..
3. Power switch (S1) turned ON.
A. Component cooling fan energized.
B. Power ON light (Amber) comes ON.
C. Power to one side of the following
components: Normal ROAST timer terminal
1, ROAST & HOLD timer terminal 1,
transformer primary (T1).
NOTE: Power is available to the oven light switch
(wire #20) to turn the oven cavity lights ON when the
light switch is turned ON; and power is available to the
normally open N.O. side (wire #28) of the door switch
contacts and connects power to additional
components when the door switch contacts are
CLOSED (door closed).
1)
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Door switch contacts CLOSED.
Transformer (T1) energized.
a. Power (24VAC) to one side of the
following components: heat relay
(R3) normally open (N.O.)
contacts, high limit --- connected
through the normally closed
(N.C.) contacts to the 1st valve
(safety) on the dual solenoid gas
valve.
a) 1st valve (safety) on the gas
valve energized.