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WKG Series Full Size Gas Convection Ovens - ELECTRICAL OPERATION
C.
Component cooling fan.
4.
The oven will remain in this condition until the
power switch (S1) is turned to the OFF or ON
position.
WKGC, WKGCX (Roast & Hold Standard on
Computer Model)
Schematic diagram 10835 will be used to explain the
electrical sequence of operation for both the ROAST
cycle (normal cooking) and the ROAST & HOLD cycle.
Roast Cycle (Normal 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:
oven cavity lights, convection fan
motor common ©), transformer primary
(T1), 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 (T1), ignition
control module, the 1st valve (safety)
and 2nd 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 setup properly and
ready to use.
G.
Oven light switch (S2) ON/OFF (position
has no affect on the function of the ROAST
cycle).
H.
High limit switch CLOSED.
I.
Oven doors Closed.
1)
Door switch contacts CLOSED.
J.
Oven cavity temperature below 140°F.
2.
Power switch (S1) turned ON.
A.
Power (120VAC) to computer control pin 3
(C3-3).
NOTE: Power at pin 3 is not transferred to other
components until computer control is energized and
operating conditions are met.
B.
Power is available to the oven light switch
(S2).
C.
Power to terminal 1 on solid state relay 1
(SSR1 -load side) and solid state relay 2
(SSR2 -load side).
D.
Component cooling fan energized.
E.
Transformer (T1) is energized.
1)
NOTE: Gas does not flow to the burner until the 2nd
valve (main) is energized.
2)
NOTE: If the control passes self test, then the outputs
are energized and operation sequence continues. If
control does not pass self test then the corresponding
error code is displayed.
NOTE: The set point temperature of the computer
control will be the last temperature that was set.
NOTE: Power is not applied to the heat relay coil (R1)
until the centrifugal switch contacts on the convection
fan motor close.
Page 53 of 74
Power (24VAC) to one side of the
following components: heat relay (R1)
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.
Power (24VAC) to the oven computer
control.
a.
Control is energized and performs
a power ON self test before
energizing outputs.
b.
Computer control senses oven
cavity temperature.
a)
With the oven cavity
temperature below set point,
the controls 120VAC output
from pin C3-2 is activated
and power is connected to
the common ©) side of the
centrifugal switch contacts
on the convection fan motor.
c.
The controls 5VDC output from
pins C2-2 (-) and C2-8 (+) is
activated and SSR1 relay is
energized.
a)
Convection fan motor is
energized (fan speed hi).
F32700 Rev. B (0315)
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