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WKG Series Full Size Gas Convection Ovens - ELECTRICAL OPERATION
NOTE: Gas does not flow to the burner until the 2nd
valve (main) is energized.
2)
With door switch closed, power is
applied to motor speed (Hi/Low) relay
(R1) normally open (N.O.) contacts
and hold relay (R2) common ©).
a.
Motor speed relay (R1) is
energized through hold relay (R2)
normally closed contacts (N.C.).
Relay contacts (R1) change state
and the normally open (N.O.) set
of contacts close.
a)
NOTE: In the ROAST & HOLD cycle, the fan speed
is fixed at low.
b)
c)
3)
Power is also connected back through
a second set of contacts on the power
switch (S1) to terminal 8 on the
temperature control board.
a.
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)
b)
c)
F32700 Rev. B (0315)
Power is connected through
the function switch (S3)
contacts and convection fan
motor is energized (fan
speed low).
When the convection fan
motor reaches operating
speed, the centrifugal switch
(N.O.) on the motor closes.
Power to normally open
(N.O.) side of internal relay
contacts (terminal 7) on the
temperature control board.
Heat light (clear) comes ON.
Power is connected through
the centrifugal switch
contacts on the convection
fan motor, heat relay (R3) is
energized, (R3) contacts
(N.O.) close and the heating
circuit is powered.
Ignition control module is
energized.
4.
Oven reaches set temperature.
A.
Temperature control de-energizes internal
relay and the normally open (N.O.) contacts
OPEN.
B.
Heat light goes out.
C.
Power removed from heat relay (R3).
1)
NOTE: This is considered first stage cooking in the
ROAST & HOLD cycle.
5.
The oven will continue to cycle on the
temperature control until one of the following
occurs: ROAST & HOLD time (R & H cooking)
expires which allows the oven to go into Hold
mode; Power switch (S1) is turned to the OFF or
COOL DOWN position or the doors are opened.
Timer Cycle (Roast & Hold Cooking)
NOTE: The ROAST & HOLD timer operates
independently of the heating cycle until time expires.
Regulation of the oven temperature is then turned
over to the Hold thermostat until one of the following
Page 50 of 74
d)
No ignition light (red) comes
ON, module performs a self
diagnostic test for 4 seconds,
2nd valve (main) on the gas
valve is energized. Gas
starts to flow to the burner,
sparking begins, the "no
ignition" light goes out and
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,
the "no ignition" light comes
back on, 2nd valve (main) on
the gas valve is de-
energized and gas flow to the
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.
R3 normally open (N.O.) contacts
OPEN.
a.
Power removed from 2nd valve
(main) on the gas valve and gas
flow to the burner stops.
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