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WKG Series Full Size Gas Convection Ovens - ELECTRICAL OPERATION
SEQUENCE OF OPERATION
WKG, WKGX With Roast & Hold Option
(Mechanical KX Thermostat)
Schematic diagram 10832 will be used to explain the
electrical sequence of operation for both the Normal
ROAST cycle (normal cooking) and the ROAST &
HOLD cycle.
Normal Roast 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:
power ON light, heat light, oven cavity
lights, buzzer, ROAST timer motor
(normal cooking), ROAST & HOLD
timer motor, heat relay coil (R3),
convection fan motor common ©),
transformer primary (T1), relay coil
(R4), motor speed (Hi/Low) relay coil
(R1), hold relay coil (R2) and the
component cooling fan.
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 Normal ROAST
cycle.
G.
Oven light switch (S2) ON/OFF (position
has no affect on the function of the Normal
ROAST cycle).
H.
Control thermostat dial in the OFF position
(OPEN).
I.
High limit switch CLOSED.
J.
Cook timer (normal cooking) in the OFF
position.
K.
Roast and Hold timer in the OFF position.
L.
Oven doors CLOSED.
1)
Door switch contacts CLOSED.
M. Oven cavity temperature below 140°F.
2.
Set thermostat to desired Normal ROAST
temperature (normal cooking).
A.
Internal contacts close.
3.
Power switch (S1) turned ON.
A.
Power to motor speed (Hi/Low) relay (R1)
normally open (N.O.) contacts and hold
relay (R2) common ©).
B.
Component cooling fan energized.
C.
Power ON light (Amber) comes ON.
D.
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)
NOTE: Gas does not flow to the burner until the 2nd
valve (main) is energized.
2)
3)
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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.
With door switch closed, power is
connected back through a second set
of contacts on the power switch (S1),
through the thermostat contacts,
through one set of relay R4 normally
closed (N.C.) contacts, to one side of
the centrifugal switch on the
convection fan motor.
a.
Heat light (clear) comes ON.
Power is also connected through the
other set of relay R4 normally closed
(N.C.) contacts to the other side of
motor speed relay (R1).
a.
Motor speed relay (R1)
energized, contacts change state
and the normally open (N.O.) set
of contacts close.
F32700 Rev. B (0315)
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