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2. Power switch (S1) turned to COOL DOWN.
A. Power to fan speed switch (S3). Set fan
speed switch to either HI or LO.
3. If door is closed, power is supplied to one
side of the following components:
A. Power ON light (Amber) comes ON.
B. Transformer (T1) energized.
1) Power (24 VAC) 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 first
valve (safety) on the dual solenoid
gas valve.
a. First valve (safety) on the gas
valve energized. Gas does not
flow to the burner until the second
valve (main) is energized.
C. Component cooling fan.
D. Power to timer and oven cavity lights.
4. The oven will remain in this condition until the
master switch (S1) is turned to the OFF or ON
position.
SG4C/SG6C with Computer Controller
Schematic 426575-1 will be used to explain the
electrical sequence of operation.
Normal Cook Cycle
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: oven
cavity lights, convection fan motor
common (C), transformer primary
(T2), component cooling fan and the
heat relay coil (R1).
B. Oven properly grounded.
1) Ground (GND) to one side of the
following components: computer
control case, no ignition light,
transformer secondary (T2), ignition
control module, the first valve (safety)
and second valve (main) on the dual
solenoid gas valve and computer
control pin 9 (C3-9).
C. Gas supply valve ON.
D. Gas combination control valve ON.
E. Power switch (S1) OFF.
F. Computer control is set up properly and
ready to use.
G. Oven lights switch (S2) ON or OFF
(position has no affect on the function of
the normal cook cycle).
H. High limit thermostat closed.
I. Oven doors closed.
J. Oven cavity temperature below 140°F.
2. Power switch (S1) turned ON.
A. Power (120 VAC) to computer control pin
3 (C3-3). Power at pin 3 is not transferred
to other components until computer
control is energized and operation
conditions are met.
B. Power is available to the oven light switch
(S2).